removed incorrect test

moving all references to release branch
was previously `master`
2020-12-16 23:53:13 -08:00 · 2020-12-16 23:00:35 -08:00 · 2020-12-16 15:00:18 -08:00 · 2020-12-16 14:59:31 -08:00 · 2020-12-15 20:53:05 -08:00 · 2020-12-15 02:07:08 -08:00
198 changed files with 11373 additions and 36480 deletions
@@ -89,7 +89,11 @@ jobs:
    steps:
    - uses: actions/checkout@v2
    - name: cmake build and test check
-      run: make cmakebuild
+      run: |
+        FUZZERTEST=-T1mn ZSTREAM_TESTTIME=-T1mn make cmakebuild
+        cp -r ./ "../zstd source"
+        cd "../zstd source"
+        FUZZERTEST=-T1mn ZSTREAM_TESTTIME=-T1mn make cmakebuild

  gcc-8-asan-ubsan-fuzz:
    runs-on: ubuntu-latest
@@ -98,7 +102,7 @@ jobs:
    - name: gcc-8 + ASan + UBSan + Fuzz Test
      run: |
        make gcc8install
-        CC=gcc-8 make clean uasan-fuzztest
+        CC=gcc-8 FUZZER_FLAGS="--long-tests" make clean uasan-fuzztest

  gcc-6-asan-ubsan-fuzz32:
    runs-on: ubuntu-latest
@@ -107,7 +111,7 @@ jobs:
    - name: gcc-6 + ASan + UBSan + Fuzz Test 32bit
      run: |
        make gcc6install libc6install
-        CC=gcc-6 CFLAGS="-O2 -m32" make uasan-fuzztest
+        CC=gcc-6 CFLAGS="-O2 -m32" FUZZER_FLAGS="--long-tests" make uasan-fuzztest

  clang-38-msan-fuzz:
    runs-on: ubuntu-16.04 # fails on 18.04
@@ -155,23 +159,25 @@ jobs:
        sudo apt-get install gcc-mingw-w64
        CC=x86_64-w64-mingw32-gcc CXX=x86_64-w64-mingw32-g++ CFLAGS="-Werror -O1" make zstd

-  armbuild:
-    runs-on: ubuntu-16.04 # doesn't work on latest
-    steps:
-    - uses: actions/checkout@v2
-    - name: ARM Build Test
-      run: |
-        make arminstall
-        make armbuild
+# TODO: Broken test - fix and uncomment
+#  armbuild:
+#    runs-on: ubuntu-16.04 # doesn't work on latest
+#    steps:
+#    - uses: actions/checkout@v2
+#    - name: ARM Build Test
+#      run: |
+#        make arminstall
+#        make armbuild

-  armfuzz:
-    runs-on: ubuntu-16.04 # doesn't work on latest
-    steps:
-    - uses: actions/checkout@v2
-    - name: Qemu ARM emulation + Fuzz Test
-      run: |
-        make arminstall
-        make armfuzz
+# TODO: Broken test - fix and uncomment
+#  armfuzz:
+#    runs-on: ubuntu-16.04 # doesn't work on latest
+#    steps:
+#    - uses: actions/checkout@v2
+#    - name: Qemu ARM emulation + Fuzz Test
+#      run: |
+#        make arminstall
+#        make armfuzz

  bourne-shell:
    runs-on: ubuntu-latest
@@ -182,3 +188,22 @@ jobs:
        wget https://github.com/koalaman/shellcheck/releases/download/v0.7.1/shellcheck-v0.7.1.linux.x86_64.tar.xz
        tar -xf shellcheck-v0.7.1.linux.x86_64.tar.xz
        shellcheck-v0.7.1/shellcheck --shell=sh --severity=warning --exclude=SC2010 tests/playTests.sh
+
+  icc:
+    name: icc-check
+    runs-on: ubuntu-latest
+    steps:
+    - name: install icc
+      run: |
+        export DEBIAN_FRONTEND=noninteractive
+        sudo apt-get -qqq update
+        sudo apt-get install -y wget build-essential pkg-config cmake ca-certificates gnupg
+        sudo wget https://apt.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS-2023.PUB
+        sudo apt-key add GPG-PUB-KEY-INTEL-SW-PRODUCTS-2023.PUB
+        sudo add-apt-repository "deb https://apt.repos.intel.com/oneapi all main"
+        sudo apt-get update
+        sudo apt-get install -y intel-basekit intel-hpckit
+    - uses: actions/checkout@v2
+    - name: make check
+      run: |
+        make CC=/opt/intel/oneapi/compiler/latest/linux/bin/intel64/icc check
@@ -3,17 +3,17 @@ name: generic-release
 on:
  pull_request:
    # This will eventually only be for pushes to master
-    # but for dogfooding purposes, I'm running it even 
+    # but for dogfooding purposes, I'm running it even
    # on dev pushes
    branches: [ dev, master, actionsTest ]

 jobs:
  # missing jobs
-  # 
+  #
  # ppc64le + fuzz test
  # Qemu PPC64 + Fuzz test
  # Qemu aarch64 + Fuzz Test (on Xenial)
-  # versions comp   
+  # versions comp
  # meson test

  osx:
@@ -24,7 +24,7 @@ jobs:
      run: |
        make test
        # make -c lib all (need to fix. not working right now)
-  
+
  zbuff:
    runs-on: ubuntu-16.04
    steps:
@@ -32,7 +32,7 @@ jobs:
    - name: zbuff test
      run: |
        make -C tests test-zbuff
-        
+
  tsan:
    runs-on: ubuntu-16.04
    steps:
@@ -53,7 +53,7 @@ jobs:
        make gpp6install valgrindinstall
        make -C zlibWrapper test
        make -C zlibWrapper valgrindTest
-  
+
  lz4-threadpool-partial-libs:
    runs-on: ubuntu-16.04
    steps:
@@ -62,6 +62,7 @@ jobs:
      run: |
        make lz4install
        make -C tests test-lz4
+        make check < /dev/null | tee   # mess with lz4 console detection
        make clean
        make -C tests test-pool
        make clean
@@ -0,0 +1,13 @@
+name: linux-kernel
+
+on:
+  pull_request:
+    branches: [ dev, master, actionsTest ]
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Create linux kernel library + build + test
+      run: make -C contrib/linux-kernel test CFLAGS="-Werror -Wunused-const-variable -Wunused-but-set-variable"
@@ -23,6 +23,7 @@ zstdmt
 # Test artefacts
 tmp*
 *.zst
+*.zstd
 dictionary.
 dictionary
 NUL
@@ -25,22 +25,6 @@ env:
 matrix:
  fast_finish: true
  include:
-    - name: icc
-      compiler: icc
-      env:
-      - C_COMPILER=icc
-      - CXX_COMPILER=icpc
-      install:
-      - source /opt/intel/inteloneapi/compiler/latest/env/vars.sh
-      addons:
-        apt:
-          sources:
-          - sourceline: 'deb https://apt.repos.intel.com/oneapi all main'
-            key_url: 'https://apt.repos.intel.com/intel-gpg-keys/GPG-PUB-KEY-INTEL-SW-PRODUCTS-2023.PUB'
-          packages:
-          - intel-oneapi-icc
-      script: make check
-
    - name: arm64    # ~2.5 mn
      os: linux
      arch: arm64
@@ -92,14 +76,14 @@ matrix:

    - name: Minimal Decompressor Macros    # ~5mn
      script:
-        - make clean
-        - make -j all check ZSTD_LIB_MINIFY=1 MOREFLAGS="-Werror"
-        - make clean
-        - make -j all check MOREFLAGS="-Werror -DHUF_FORCE_DECOMPRESS_X1 -DZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT"
-        - make clean
-        - make -j all check MOREFLAGS="-Werror -DHUF_FORCE_DECOMPRESS_X2 -DZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG"
-        - make clean
-        - make -j all check MOREFLAGS="-Werror -DZSTD_NO_INLINE -DZSTD_STRIP_ERROR_STRINGS"
+        - make clean && make -j all ZSTD_LIB_MINIFY=1 MOREFLAGS="-Werror"
+        - make clean && make check ZSTD_LIB_MINIFY=1 MOREFLAGS="-Werror"
+        - make clean && make -j all MOREFLAGS="-Werror -DHUF_FORCE_DECOMPRESS_X1 -DZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT"
+        - make clean && make check MOREFLAGS="-Werror -DHUF_FORCE_DECOMPRESS_X1 -DZSTD_FORCE_DECOMPRESS_SEQUENCES_SHORT"
+        - make clean && make -j all MOREFLAGS="-Werror -DHUF_FORCE_DECOMPRESS_X2 -DZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG"
+        - make clean && make check MOREFLAGS="-Werror -DHUF_FORCE_DECOMPRESS_X2 -DZSTD_FORCE_DECOMPRESS_SEQUENCES_LONG"
+        - make clean && make -j all MOREFLAGS="-Werror -DZSTD_NO_INLINE -DZSTD_STRIP_ERROR_STRINGS"
+        - make clean && make check MOREFLAGS="-Werror -DZSTD_NO_INLINE -DZSTD_STRIP_ERROR_STRINGS"

    - name: cmake build and test check    # ~6mn
      script:
@@ -232,11 +216,12 @@ matrix:
        - make -C zlibWrapper test
        - make -C zlibWrapper valgrindTest

-    - name: LZ4, thread pool, and partial libs tests    # ~2mn
+    - name: LZ4, thread pool, and partial libs tests    # ~4mn
      if: branch = master
      script:
        - make lz4install
        - make -C tests test-lz4
+        - make check < /dev/null | tee    # mess with lz4 console detection
        - make clean
        - make -C tests test-pool
        - make clean
@@ -1,4 +1,62 @@
-v1.4.5
+v1.4.7
+perf: stronger --long mode at high compression levels, by @senhuang42
+perf: stronger --patch-from at high compression levels, thanks to --long improvements
+perf: faster dictionary compression at medium compression levels, by @felixhandte
+perf: small speed & memory usage improvements for ZSTD_compress2(), by @terrelln
+perf: improved fast compression speeds with Visual Studio, by @animalize
+cli : Set nb of threads with environment variable ZSTD_NBTHREADS, by @senhuang42
+cli : accept decompressing files with *.zstd suffix
+cli : provide a condensed summary by default when processing multiple files
+cli : fix : stdin input no longer confused as user prompt
+cli : improve accuracy of several error messages
+api : new sequence ingestion API, by @senhuang42
+api : shared thread pool: control total nb of threads used by multiple compression jobs, by @marxin
+api : new ZSTD_getDictID_fromCDict(), by @LuAPi
+api : zlibWrapper only uses public API, and is compatible with dynamic library, by @terrelln
+api : fix : multithreaded compression has predictable output even in special cases (see #2327) (issue not accessible from cli)
+api : fix : dictionary compression correctly respects dictionary compression level (see #2303) (issue not accessible from cli)
+build: fix cmake script when using path with spaces, by @terrelln
+build: improved compile-time detection of aarch64/neon platforms, by @bsdimp
+build: Fix building on AIX 5.1, by @likema
+build: compile paramgrill with cmake on Windows, requested by @mirh
+doc : clarify repcode updates in format specification, by @felixhandte
+
+v1.4.6
+fix : Always return dstSize_tooSmall when that is the case
+fix : Fix ZSTD_initCStream_advanced() with static allocation and no dictionary
+perf: Improve small block decompression speed by 20%+, by @terrelln
+perf: Reduce compression stack usage by 1 KB, by @terrelln
+perf: Improve decompression speed by improving ZSTD_wildcopy, by @helloguo (#2252, #2256)
+perf: Improve histogram construction, by @cyan4973 (#2253)
+cli : Add --output-dir-mirror option, by @xxie24 (#2219)
+cli : Warn when (de)compressing multiple files into a single output, by @senhuang42 (#2279)
+cli : Improved progress bar and status summary when (de)compressing multiple files, by @senhuang42 (#2283)
+cli : Call stat less often, by @felixhandte (#2262)
+cli : Allow --patch-from XXX and --filelist XXX in addition to --patch-from=XXX and --filelist=XXX, by @cyan4973 (#2250)
+cli : Allow --patch-from to compress stdin with --stream-size, by @bimbashrestha (#2206)
+api : Do not install zbuff.h, since it has long been deprecated, by @cyan4973 (#2166).
+api : Fix ZSTD_CCtx_setParameter() with ZSTD_c_compressionLevel to make 0 mean default level, by @i-do-cpp (#2291)
+api : Rename ZSTDMT_NBTHREADS_MAX to ZSTDMT_NBWORKERS_MAX, by @marxin (#2228).
+build: Install pkg-config file with CMake and MinGW, by @tonytheodore (#2183)
+build: Install DLL with CMake on Windows, by @BioDataAnalysis (#2221)
+build: Fix DLL install location with CMake, by @xantares and @bimbashrestha (#2186)
+build: Add ZSTD_NO_UNUSED_FUNCTIONS macro to hide unused functions
+build: Add ZSTD_NO_INTRINSICS macro to avoid explicit intrinsics
+build: Add STATIC_BMI2 macro for compile time detection of BMI2 on MSVC, by @Niadb (#2258)
+build: Fix -Wcomma warnings, by @cwoffenden
+build: Remove distutils requirement for meson build, by @neheb (#2197)
+build: Fix cli compilation with uclibc
+build: Fix cli compilation without st_mtime, by @ffontaine (#2246)
+build: Fix shadowing warnings in library
+build: Fix single file library compilation with Enscripten, by @yoshihitoh (#2227)
+misc: Improve single file library and include dictBuilder, by @cwoffenden
+misc: Allow compression dictionaries with missing symbols
+misc: Add freestanding translation script in contrib/freestanding_lib
+misc: Collect all of zstd's libc dependencies into zstd_deps.h
+doc : Add ZSTD_versionString() to manual, by @animalize
+doc : Fix documentation for ZSTD_CCtxParams_setParameter(), by @felixhandte (#2270)
+
+v1.4.5  (May 22, 2020)
 fix : Compression ratio regression on huge files (> 3 GB) using high levels (--ultra) and multithreading, by @terrelln
 perf: Improved decompression speed: x64 : +10% (clang) / +5% (gcc); ARM : from +15% to +50%, depending on SoC, by @terrelln
 perf: Automatically downsizes ZSTD_DCtx when too large for too long (#2069, by @bimbashreshta)
@@ -24,7 +82,7 @@ misc: Edit-distance match finder in contrib/
 doc : Improved beginner CONTRIBUTING.md docs
 doc : New issue templates for zstd

-v1.4.4
+v1.4.4  (Nov 6, 2019)
 perf: Improved decompression speed, by > 10%, by @terrelln
 perf: Better compression speed when re-using a context, by @felixhandte
 perf: Fix compression ratio when compressing large files with small dictionary, by @senhuang42
@@ -51,18 +109,18 @@ pack: modified pkgconfig, for better integration into openwrt, requested by @neh
 misc: Improved documentation : ZSTD_CLEVEL, DYNAMIC_BMI2, ZSTD_CDict, function deprecation, zstd format
 misc: fixed educational decoder : accept larger literals section, and removed UNALIGNED() macro

-v1.4.3
+v1.4.3  (Aug 20, 2019)
 bug: Fix Dictionary Compression Ratio Regression by @cyan4973 (#1709)
 bug: Fix Buffer Overflow in legacy v0.3 decompression by @felixhandte (#1722)
 build: Add support for IAR C/C++ Compiler for Arm by @joseph0918 (#1705)

-v1.4.2
+v1.4.2  (Jul 26, 2019)
 bug: Fix bug in zstd-0.5 decoder by @terrelln (#1696)
 bug: Fix seekable decompression in-memory API by @iburinoc (#1695)
 misc: Validate blocks are smaller than size limit by @vivekmg (#1685)
 misc: Restructure source files by @ephiepark (#1679)

-v1.4.1
+v1.4.1  (Jul 20, 2019)
 bug: Fix data corruption in niche use cases by @terrelln (#1659)
 bug: Fuzz legacy modes, fix uncovered bugs by @terrelln (#1593, #1594, #1595)
 bug: Fix out of bounds read by @terrelln (#1590)
@@ -92,7 +150,7 @@ build: Visual Studio: fix linking by @absotively (#1639)
 build: Fix MinGW-W64 build by @myzhang1029 (#1600)
 misc: Expand decodecorpus coverage by @ephiepark (#1664)

-v1.4.0
+v1.4.0  (Apr 17, 2019)
 perf: Improve level 1 compression speed in most scenarios by 6% by @gbtucker and @terrelln
 api: Move the advanced API, including all functions in the staging section, to the stable section
 api: Make ZSTD_e_flush and ZSTD_e_end block for maximum forward progress
@@ -129,7 +187,7 @@ misc: Optimize dictionary memory usage in corner cases
 misc: Improve the dictionary builder on small or homogeneous data
 misc: Fix spelling across the repo by @jsoref

-v1.3.8
+v1.3.8  (Dec 28, 2018)
 perf: better decompression speed on large files (+7%) and cold dictionaries (+15%)
 perf: slightly better compression ratio at high compression modes
 api : finalized advanced API, last stage before "stable" status
@@ -151,14 +209,14 @@ doc : clarified zstd_compression_format.md, by @ulikunitz
 misc: fixed zstdgrep, returns 1 on failure, by @lzutao
 misc: NEWS renamed as CHANGELOG, in accordance with fboss

-v1.3.7
+v1.3.7  (Oct 20, 2018)
 perf: slightly better decompression speed on clang (depending on hardware target)
 fix : performance of dictionary compression for small input < 4 KB at levels 9 and 10
 build: no longer build backtrace by default in release mode; restrict further automatic mode
 build: control backtrace support through build macro BACKTRACE
 misc: added man pages for zstdless and zstdgrep, by @samrussell

-v1.3.6
+v1.3.6  (Oct 6, 2018)
 perf: much faster dictionary builder, by @jenniferliu
 perf: faster dictionary compression on small data when using multiple contexts, by @felixhandte
 perf: faster dictionary decompression when using a very large number of dictionaries simultaneously
@@ -172,7 +230,7 @@ build: Read Legacy format is limited to v0.5+ by default. Can be changed at comp
 doc : zstd_compression_format.md updated to match wording in IETF RFC 8478
 misc: tests/paramgrill, a parameter optimizer, by @GeorgeLu97

-v1.3.5
+v1.3.5  (Jun 29, 2018)
 perf: much faster dictionary compression, by @felixhandte
 perf: small quality improvement for dictionary generation, by @terrelln
 perf: slightly improved high compression levels (notably level 19)
@@ -187,7 +245,7 @@ build: make and make all are compatible with -j
 doc : clarify zstd_compression_format.md, updated for IETF RFC process
 misc: pzstd compatible with reproducible compilation, by @lamby

-v1.3.4
+v1.3.4  (Mar 27, 2018)
 perf: faster speed (especially decoding speed) on recent cpus (haswell+)
 perf: much better performance associating --long with multi-threading, by @terrelln
 perf: better compression at levels 13-15
@@ -205,7 +263,7 @@ build: VS2017 scripts, by @HaydnTrigg
 misc: all /contrib projects fixed
 misc: added /contrib/docker script by @gyscos

-v1.3.3
+v1.3.3  (Dec 21, 2017)
 perf: faster zstd_opt strategy (levels 16-19)
 fix : bug #944 : multithreading with shared ditionary and large data, reported by @gsliepen
 cli : fix : content size written in header by default
@@ -217,7 +275,7 @@ api : change : when setting `pledgedSrcSize`, use `ZSTD_CONTENTSIZE_UNKNOWN` mac
 build: fix : compilation under rhel6 and centos6, reported by @pixelb
 build: added `check` target

-v1.3.2
+v1.3.2  (Oct 10, 2017)
 new : long range mode, using --long command, by Stella Lau (@stellamplau)
 new : ability to generate and decode magicless frames (#591)
 changed : maximum nb of threads reduced to 200, to avoid address space exhaustion in 32-bits mode
@@ -240,7 +298,7 @@ example : added streaming_memory_usage
 license : changed /examples license to BSD + GPLv2
 license : fix a few header files to reflect new license (#825)

-v1.3.1
+v1.3.1  (Aug 21, 2017)
 New license : BSD + GPLv2
 perf: substantially decreased memory usage in Multi-threading mode, thanks to reports by Tino Reichardt (@mcmilk)
 perf: Multi-threading supports up to 256 threads. Cap at 256 when more are requested (#760)
@@ -255,7 +313,7 @@ new : contrib/adaptive-compression, I/O driven compression strength, by Paul Cru
 new : contrib/long_distance_matching, statistics by Stella Lau (@stellamplau)
 updated : contrib/linux-kernel, by Nick Terrell (@terrelln)

-v1.3.0
+v1.3.0  (Jul 6, 2017)
 cli : new : `--list` command, by Paul Cruz
 cli : changed : xz/lzma support enabled by default
 cli : changed : `-t *` continue processing list after a decompression error
@@ -270,7 +328,7 @@ tools : decodecorpus can generate random dictionary-compressed samples, by Paul
 new : contrib/seekable_format, demo and API, by Sean Purcell
 changed : contrib/linux-kernel, updated version and license, by Nick Terrell

-v1.2.0
+v1.2.0  (May 5, 2017)
 cli : changed : Multithreading enabled by default (use target zstd-nomt or HAVE_THREAD=0 to disable)
 cli : new : command -T0 means "detect and use nb of cores", by Sean Purcell
 cli : new : zstdmt symlink hardwired to `zstd -T0`
@@ -292,7 +350,7 @@ build: enabled Multi-threading support for *BSD, by Baptiste Daroussin
 tools: updated Paramgrill. Command -O# provides best parameters for sample and speed target.
 new : contrib/linux-kernel version, by Nick Terrell

-v1.1.4
+v1.1.4  (Mar 18, 2017)
 cli : new : can compress in *.gz format, using --format=gzip command, by Przemyslaw Skibinski
 cli : new : advanced benchmark command --priority=rt
 cli : fix : write on sparse-enabled file systems in 32-bits mode, by @ds77
@@ -308,7 +366,7 @@ build : improved cmake script, by @Majlen
 build : added -Wformat-security flag, as recommended by Padraig Brady
 doc : new : educational decoder, by Sean Purcell

-v1.1.3
+v1.1.3  (Feb 7, 2017)
 cli : zstd can decompress .gz files (can be disabled with `make zstd-nogz` or `make HAVE_ZLIB=0`)
 cli : new : experimental target `make zstdmt`, with multi-threading support
 cli : new : improved dictionary builder "cover" (experimental), by Nick Terrell, based on prior work by Giuseppe Ottaviano.
@@ -324,7 +382,7 @@ API : fix : all symbols properly exposed in libzstd, by Nick Terrell
 build : support for Solaris target, by Przemyslaw Skibinski
 doc : clarified specification, by Sean Purcell

-v1.1.2
+v1.1.2  (Dec 15, 2016)
 API : streaming : decompression : changed : automatic implicit reset when chain-decoding new frames without init
 API : experimental : added : dictID retrieval functions, and ZSTD_initCStream_srcSize()
 API : zbuff : changed : prototypes now generate deprecation warnings
@@ -341,7 +399,7 @@ zlib_wrapper : added support for gz* functions, by Przemyslaw Skibinski
 install : better compatibility with FreeBSD, by Dimitry Andric
 source tree : changed : zbuff source files moved to lib/deprecated

-v1.1.1
+v1.1.1  (Nov 2, 2016)
 New : command -M#, --memory=, --memlimit=, --memlimit-decompress= to limit allowed memory consumption
 New : doc/zstd_manual.html, by Przemyslaw Skibinski
 Improved : slightly better compression ratio at --ultra levels (>= 20)
@@ -352,7 +410,7 @@ Changed : zstd_errors.h is now installed within /include (and replaces errors_pu
 Updated man page
 Fixed : zstd-small, zstd-compress and zstd-decompress compilation targets

-v1.1.0
+v1.1.0  (Sep 28, 2016)
 New : contrib/pzstd, parallel version of zstd, by Nick Terrell
 added : NetBSD install target (#338)
 Improved : speed for batches of small files
@@ -366,7 +424,7 @@ Fixed : compatibility with OpenBSD, reported by Juan Francisco Cantero Hurtado (
 Fixed : compatibility with Hurd, by Przemyslaw Skibinski (#365)
 Fixed : zstd-pgo, reported by octoploid (#329)

-v1.0.0
+v1.0.0  (Sep 1, 2016)
 Change Licensing, all project is now BSD, Copyright Facebook
 Small decompression speed improvement
 API : Streaming API supports legacy format
@@ -375,7 +433,7 @@ CLI supports legacy formats v0.4+
 Fixed : compression fails on certain huge files, reported by Jesse McGrew
 Enhanced documentation, by Przemyslaw Skibinski

-v0.8.1
+v0.8.1  (Aug 18, 2016)
 New streaming API
 Changed : --ultra now enables levels beyond 19
 Changed : -i# now selects benchmark time in second
@@ -384,7 +442,7 @@ Fixed : speed regression on specific patterns (#272)
 Fixed : support for Z_SYNC_FLUSH, by Dmitry Krot (#291)
 Fixed : ICC compilation, by Przemyslaw Skibinski

-v0.8.0
+v0.8.0  (Aug 2, 2016)
 Improved : better speed on clang and gcc -O2, thanks to Eric Biggers
 New : Build on FreeBSD and DragonFly, thanks to JrMarino
 Changed : modified API : ZSTD_compressEnd()
@@ -397,17 +455,17 @@ Modified : minor compression level adaptations
 Updated : compression format specification to v0.2.0
 changed : zstd.h moved to /lib directory

-v0.7.5
+v0.7.5  (Aug 1, 2016)
 Transition version, supporting decoding of v0.8.x

-v0.7.4
+v0.7.4  (Jul 17, 2016)
 Added : homebrew for Mac, by Daniel Cade
 Added : more examples
 Fixed : segfault when using small dictionaries, reported by Felix Handte
 Modified : default compression level for CLI is now 3
 Updated : specification, to v0.1.1

-v0.7.3
+v0.7.3  (Jul 9, 2016)
 New : compression format specification
 New : `--` separator, stating that all following arguments are file names. Suggested by Chip Turner.
 New : `ZSTD_getDecompressedSize()`
@@ -419,18 +477,18 @@ fixed : multi-blocks decoding with intermediate uncompressed blocks, reported by
 modified : removed "mem.h" and "error_public.h" dependencies from "zstd.h" (experimental section)
 modified : legacy functions no longer need magic number

-v0.7.2
+v0.7.2  (Jul 4, 2016)
 fixed : ZSTD_decompressBlock() using multiple consecutive blocks. Reported by Greg Slazinski.
 fixed : potential segfault on very large files (many gigabytes). Reported by Chip Turner.
 fixed : CLI displays system error message when destination file cannot be created (#231). Reported by Chip Turner.

-v0.7.1
+v0.7.1  (Jun 23, 2016)
 fixed : ZBUFF_compressEnd() called multiple times with too small `dst` buffer, reported by Christophe Chevalier
 fixed : dictBuilder fails if first sample is too small, reported by Руслан Ковалёв
 fixed : corruption issue, reported by cj
 modified : checksum enabled by default in command line mode

-v0.7.0
+v0.7.0  (Jun 17, 2016)
 New : Support for directory compression, using `-r`, thanks to Przemyslaw Skibinski
 New : Command `--rm`, to remove source file after successful de/compression
 New : Visual build scripts, by Christophe Chevalier
@@ -443,7 +501,7 @@ API : support for custom malloc/free functions
 New : controllable Dictionary ID
 New : Support for skippable frames

-v0.6.1
+v0.6.1  (May 13, 2016)
 New : zlib wrapper API, thanks to Przemyslaw Skibinski
 New : Ability to compile compressor / decompressor separately
 Changed : new lib directory structure
@@ -453,103 +511,103 @@ Fixed : null-string roundtrip (#176)
 New : benchmark mode can select directory as input
 Experimental : midipix support, VMS support

-v0.6.0
+v0.6.0  (Apr 13, 2016)
 Stronger high compression modes, thanks to Przemyslaw Skibinski
 API : ZSTD_getFrameParams() provides size of decompressed content
 New : highest compression modes require `--ultra` command to fully unleash their capacity
 Fixed : zstd cli return error code > 0 and removes dst file artifact when decompression fails, thanks to Chip Turner

-v0.5.1
+v0.5.1  (Feb 18, 2016)
 New : Optimal parsing => Very high compression modes, thanks to Przemyslaw Skibinski
 Changed : Dictionary builder integrated into libzstd and zstd cli
 Changed (!) : zstd cli now uses "multiple input files" as default mode. See `zstd -h`.
 Fix : high compression modes for big-endian platforms
 New : zstd cli : `-t` | `--test` command

-v0.5.0
+v0.5.0  (Feb 5, 2016)
 New : dictionary builder utility
 Changed : streaming & dictionary API
 Improved : better compression of small data

-v0.4.7
+v0.4.7  (Jan 22, 2016)
 Improved : small compression speed improvement in HC mode
 Changed : `zstd_decompress.c` has ZSTD_LEGACY_SUPPORT to 0 by default
 fix : bt search bug

-v0.4.6
+v0.4.6  (Jan 13, 2016)
 fix : fast compression mode on Windows
 New : cmake configuration file, thanks to Artyom Dymchenko
 Improved : high compression mode on repetitive data
 New : block-level API
 New : ZSTD_duplicateCCtx()

-v0.4.5
+v0.4.5  (Dec 18, 2015)
 new : -m/--multiple : compress/decompress multiple files

-v0.4.4
+v0.4.4  (Dec 14, 2015)
 Fixed : high compression modes for Windows 32 bits
 new : external dictionary API extended to buffered mode and accessible through command line
 new : windows DLL project, thanks to Christophe Chevalier

-v0.4.3 :
+v0.4.3  (Dec 7, 2015)
 new : external dictionary API
 new : zstd-frugal

-v0.4.2 :
+v0.4.2  (Dec 2, 2015)
 Generic minor improvements for small blocks
 Fixed : big-endian compatibility, by Peter Harris (#85)

-v0.4.1
+v0.4.1  (Dec 1, 2015)
 Fixed : ZSTD_LEGACY_SUPPORT=0 build mode (reported by Luben)
 removed `zstd.c`

-v0.4.0
+v0.4.0  (Nov 29, 2015)
 Command line utility compatible with high compression levels
 Removed zstdhc => merged into zstd
 Added : ZBUFF API (see zstd_buffered.h)
 Rolling buffer support

-v0.3.6
+v0.3.6  (Nov 10, 2015)
 small blocks params

-v0.3.5
+v0.3.5  (Nov 9, 2015)
 minor generic compression improvements

-v0.3.4
+v0.3.4  (Nov 6, 2015)
 Faster fast cLevels

-v0.3.3
+v0.3.3  (Nov 5, 2015)
 Small compression ratio improvement

-v0.3.2
+v0.3.2  (Nov 2, 2015)
 Fixed Visual Studio

-v0.3.1 :
+v0.3.1  (Nov 2, 2015)
 Small compression ratio improvement

-v0.3
+v0.3  (Oct 30, 2015)
 HC mode : compression levels 2-26

-v0.2.2
+v0.2.2  (Oct 28, 2015)
 Fix : Visual Studio 2013 & 2015 release compilation, by Christophe Chevalier

-v0.2.1
+v0.2.1  (Oct 24, 2015)
 Fix : Read errors, advanced fuzzer tests, by Hanno Böck

-v0.2.0
+v0.2.0  (Oct 22, 2015)
 **Breaking format change**
 Faster decompression speed
 Can still decode v0.1 format

-v0.1.3
+v0.1.3  (Oct 15, 2015)
 fix uninitialization warning, reported by Evan Nemerson

-v0.1.2
+v0.1.2  (Sep 11, 2015)
 frame concatenation support

-v0.1.1
+v0.1.1  (Aug 27, 2015)
 fix compression bug
 detects write-flush errors

-v0.1.0
+v0.1.0  (Aug 25, 2015)
 first release
@@ -5,7 +5,7 @@ possible.
 ## Our Development Process
 New versions are being developed in the "dev" branch,
 or in their own feature branch.
-When they are deemed ready for a release, they are merged into "master".
+When they are deemed ready for a release, they are merged into "release".

 As a consequences, all contributions must stage first through "dev"
 or their own feature branch.
@@ -383,7 +383,7 @@ CI tests run every time a pull request (PR) is created or updated. The exact tes
 that get run will depend on the destination branch you specify. Some tests take
 longer to run than others. Currently, our CI is set up to run a short
 series of tests when creating a PR to the dev branch and a longer series of tests
-when creating a PR to the master branch. You can look in the configuration files
+when creating a PR to the release branch. You can look in the configuration files
 of the respective CI platform for more information on what gets run when.

 Most people will just want to create a PR with the destination set to their local dev
@@ -31,9 +31,9 @@ VOID = /dev/null
 TARGET_SYSTEM ?= $(OS)

 ifneq (,$(filter Windows%,$(TARGET_SYSTEM)))
-EXT =.exe
+  EXT =.exe
 else
-EXT =
+  EXT =
 endif

 ## default: Build lib-release and zstd-release
@@ -65,7 +65,7 @@ lib lib-release lib-all :
 .PHONY: zstd zstd-release
 zstd zstd-release:
 	$(Q)$(MAKE) -C $(PRGDIR) $@
-	$(Q)cp $(PRGDIR)/zstd$(EXT) .
+	$(Q)ln -sf $(PRGDIR)/zstd$(EXT) zstd$(EXT)

 .PHONY: zstdmt
 zstdmt:
@@ -79,9 +79,9 @@ zlibwrapper: lib
 ## test: run long-duration tests
 .PHONY: test
 DEBUGLEVEL ?= 1
-test: MOREFLAGS += -g -DDEBUGLEVEL=$(DEBUGLEVEL) -Werror
+test: MOREFLAGS += -g -Werror
 test:
-	MOREFLAGS="$(MOREFLAGS)" $(MAKE) -j -C $(PRGDIR) allVariants
+	DEBUGLEVEL=$(DEBUGLEVEL) MOREFLAGS="$(MOREFLAGS)" $(MAKE) -j -C $(PRGDIR) allVariants
 	$(MAKE) -C $(TESTDIR) $@
 	ZSTD=../../programs/zstd $(MAKE) -C doc/educational_decoder $@

@@ -101,10 +101,10 @@ automated_benchmarking:
 .PHONY: benchmarking
 benchmarking: automated_benchmarking

-## examples: build all examples in `/examples` directory
+## examples: build all examples in `examples/` directory
 .PHONY: examples
 examples: lib
-	CPPFLAGS=-I../lib LDFLAGS=-L../lib $(MAKE) -C examples/ all
+	$(MAKE) -C examples all

 ## manual: generate API documentation in html format
 .PHONY: manual
@@ -121,6 +121,7 @@ man:
 contrib: lib
 	$(MAKE) -C contrib/pzstd all
 	$(MAKE) -C contrib/seekable_format/examples all
+	$(MAKE) -C contrib/seekable_format/tests test
 	$(MAKE) -C contrib/largeNbDicts all
 	cd contrib/single_file_libs/ ; ./build_decoder_test.sh
 	cd contrib/single_file_libs/ ; ./build_library_test.sh
@@ -139,6 +140,7 @@ clean:
 	$(Q)$(MAKE) -C contrib/gen_html $@ > $(VOID)
 	$(Q)$(MAKE) -C contrib/pzstd $@ > $(VOID)
 	$(Q)$(MAKE) -C contrib/seekable_format/examples $@ > $(VOID)
+	$(Q)$(MAKE) -C contrib/seekable_format/tests $@ > $(VOID)
 	$(Q)$(MAKE) -C contrib/largeNbDicts $@ > $(VOID)
 	$(Q)$(RM) zstd$(EXT) zstdmt$(EXT) tmp*
 	$(Q)$(RM) -r lz4
@@ -193,7 +193,7 @@ Zstandard is dual-licensed under [BSD](LICENSE) and [GPLv2](COPYING).

 ## Contributing

-The "dev" branch is the one where all contributions are merged before reaching "master".
-If you plan to propose a patch, please commit into the "dev" branch, or its own feature branch.
-Direct commit to "master" are not permitted.
+The `dev` branch is the one where all contributions are merged before reaching `release`.
+If you plan to propose a patch, please commit into the `dev` branch, or its own feature branch.
+Direct commit to `release` are not permitted.
 For more information, please read [CONTRIBUTING](CONTRIBUTING.md).
@@ -27,7 +27,7 @@ They consist of the following tests:

 Long Tests
 ----------
-Long tests run on all commits to `master` branch,
+Long tests run on all commits to `release` branch,
 and once a day on the current version of `dev` branch,
 on TravisCI.
 They consist of the following tests:
@@ -1,20 +1,20 @@
-# Following tests are run _only_ on master branch
-# To reproduce these tests, it's possible to push into a branch `appveyorTest`
-# or a branch `visual*`, they will intentionnally trigger `master` tests
+# Following tests are run _only_ on `release` branch
+# and on selected feature branch named `appveyorTest` or `visual*`

 -
  version: 1.0.{build}
  branches:
    only:
+    - release
    - master
-    - appveyorTest
+    - /appveyor*/
    - /visual*/
  environment:
    matrix:
    - COMPILER: "gcc"
      HOST:     "mingw"
      PLATFORM: "x64"
-      SCRIPT:   "make allzstd MOREFLAGS=-static && make -C tests fullbench-lib"
+      SCRIPT:   "make allzstd MOREFLAGS=-static"
      ARTIFACT: "true"
      BUILD:    "true"
    - COMPILER: "gcc"
@@ -92,9 +92,9 @@
          cd programs\ && 7z a -tzip -mx9 zstd-win-binary-%PLATFORM%.zip zstd.exe &&
          appveyor PushArtifact zstd-win-binary-%PLATFORM%.zip &&
          cp zstd.exe ..\bin\zstd.exe &&
-          git clone --depth 1 --branch master https://github.com/facebook/zstd &&
+          git clone --depth 1 --branch release https://github.com/facebook/zstd &&
          cd zstd &&
-          git archive --format=tar master -o zstd-src.tar &&
+          git archive --format=tar release -o zstd-src.tar &&
          ..\zstd -19 zstd-src.tar &&
          appveyor PushArtifact zstd-src.tar.zst &&
          certUtil -hashfile zstd-src.tar.zst SHA256 > zstd-src.tar.zst.sha256.sig &&
@@ -162,6 +162,8 @@
  - if [%TEST%]==[cmake] (
      mkdir build\cmake\build &&
      cd build\cmake\build &&
+      SET FUZZERTEST=-T2mn &&
+      SET ZSTREAM_TESTTIME=-T2mn &&
      cmake -G "Visual Studio 14 2015 Win64" .. &&
      cd ..\..\.. &&
      make clean
@@ -194,7 +196,7 @@
    - COMPILER: "gcc"
      HOST:     "mingw"
      PLATFORM: "x64"
-      SCRIPT:   "CPPFLAGS=-DDEBUGLEVEL=2 CFLAGS=-Werror make -j allzstd DEBUGLEVEL=2"
+      SCRIPT:   "CFLAGS=-Werror make -j allzstd DEBUGLEVEL=2"
    - COMPILER: "gcc"
      HOST:     "mingw"
      PLATFORM: "x86"
@@ -285,5 +287,6 @@
  - ECHO Testing %COMPILER% %PLATFORM% %CONFIGURATION%
  - if [%HOST%]==[mingw] (
      set "CC=%COMPILER%" &&
+      make clean &&
      make check
    )
@@ -7,7 +7,7 @@
 # in the COPYING file in the root directory of this source tree).
 # ################################################################

-cmake_minimum_required(VERSION 2.8.9 FATAL_ERROR)
+cmake_minimum_required(VERSION 2.8.12 FATAL_ERROR)
  
 # As of 2018-12-26 ZSTD has been validated to build with cmake version 3.13.2 new policies. 
 # Set and use the newest cmake policies that are validated to work 
@@ -137,13 +137,34 @@ endif ()
 if (UNIX OR MINGW)
    # pkg-config
    set(PREFIX "${CMAKE_INSTALL_PREFIX}")
-    set(LIBDIR "${CMAKE_INSTALL_LIBDIR}")
-    set(INCLUDEDIR "${CMAKE_INSTALL_INCLUDEDIR}")
+    set(EXEC_PREFIX "\\$$\{prefix}")
+    set(LIBDIR "${CMAKE_INSTALL_FULL_LIBDIR}")
+    set(INCLUDEDIR "${CMAKE_INSTALL_FULL_INCLUDEDIR}")
    set(VERSION "${zstd_VERSION}")
+
+    string(LENGTH "${PREFIX}" PREFIX_LENGTH)
+    string(SUBSTRING "${LIBDIR}" 0 ${PREFIX_LENGTH} LIBDIR_PREFIX)
+    string(SUBSTRING "${LIBDIR}" ${PREFIX_LENGTH} -1 LIBDIR_SUFFIX)
+    string(SUBSTRING "${INCLUDEDIR}" 0 ${PREFIX_LENGTH} INCLUDEDIR_PREFIX)
+    string(SUBSTRING "${INCLUDEDIR}" ${PREFIX_LENGTH} -1 INCLUDEDIR_SUFFIX)
+
+    if ("${INCLUDEDIR_PREFIX}" STREQUAL "${PREFIX}")
+        set(INCLUDEDIR_PREFIX "\\$$\{prefix}")
+    endif()
+    if ("${LIBDIR_PREFIX}" STREQUAL "${PREFIX}")
+        set(LIBDIR_PREFIX "\\$$\{exec_prefix}")
+    endif()
+
    add_custom_target(libzstd.pc ALL
-            ${CMAKE_COMMAND} -DIN="${LIBRARY_DIR}/libzstd.pc.in" -DOUT="libzstd.pc"
-            -DPREFIX="${PREFIX}" -DLIBDIR="${LIBDIR}" -DINCLUDEDIR="${INCLUDEDIR}" -DVERSION="${VERSION}"
-            -P "${CMAKE_CURRENT_SOURCE_DIR}/pkgconfig.cmake"
+            ${CMAKE_COMMAND}
+            -DIN=${LIBRARY_DIR}/libzstd.pc.in
+            -DOUT="libzstd.pc"
+            -DPREFIX="${PREFIX}"
+            -DEXEC_PREFIX="${EXEC_PREFIX}"
+            -DINCLUDEDIR="${INCLUDEDIR_PREFIX}${INCLUDEDIR_SUFFIX}"
+            -DLIBDIR="${LIBDIR_PREFIX}${LIBDIR_SUFFIX}"
+            -DVERSION="${VERSION}"
+            -P ${CMAKE_CURRENT_SOURCE_DIR}/pkgconfig.cmake
            COMMENT "Creating pkg-config file")

    install(FILES "${CMAKE_CURRENT_BINARY_DIR}/libzstd.pc" DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
@@ -84,9 +84,9 @@ add_test(NAME zstreamtest COMMAND zstreamtest ${ZSTD_ZSTREAM_FLAGS})
 #
 # playTests.sh
 #
-AddTestFlagsOption(ZSTD_PLAYTESTS_FLAGS "--test-large-data"
+AddTestFlagsOption(ZSTD_PLAYTESTS_FLAGS "$ENV{PLAYTESTS_FLAGS}"
    "Semicolon-separated list of flags to pass to the playTests.sh test")
-add_test(NAME playTests COMMAND sh -c "${TESTS_DIR}/playTests.sh" ${ZSTD_PLAYTESTS_FLAGS})
+add_test(NAME playTests COMMAND sh -c "\"${TESTS_DIR}/playTests.sh\" ${ZSTD_PLAYTESTS_FLAGS}")
 if (ZSTD_BUILD_PROGRAMS)
    set_property(TEST playTests APPEND PROPERTY ENVIRONMENT
        "ZSTD_BIN=$<TARGET_FILE:zstd>"
@@ -100,7 +100,9 @@ endif()
 # Label the "Medium" set of tests (see TESTING.md)
 set_property(TEST fuzzer zstreamtest playTests APPEND PROPERTY LABELS Medium)

+add_executable(paramgrill ${PROGRAMS_DIR}/benchfn.c ${PROGRAMS_DIR}/benchzstd.c ${PROGRAMS_DIR}/datagen.c ${PROGRAMS_DIR}/util.c ${PROGRAMS_DIR}/timefn.c ${TESTS_DIR}/paramgrill.c)
 if (UNIX)
-    add_executable(paramgrill ${PROGRAMS_DIR}/benchfn.c ${PROGRAMS_DIR}/benchzstd.c ${PROGRAMS_DIR}/datagen.c ${PROGRAMS_DIR}/util.c ${PROGRAMS_DIR}/timefn.c ${TESTS_DIR}/paramgrill.c)
    target_link_libraries(paramgrill libzstd_static m) #m is math library
+else()
+    target_link_libraries(paramgrill libzstd_static)
 endif ()
@@ -22,7 +22,6 @@ project('zstd',
 cc = meson.get_compiler('c')
 cxx = meson.get_compiler('cpp')
 pkgconfig = import('pkgconfig')
-python3 = import('python').find_installation()
 windows_mod = import('windows')

 host_machine_os = host_machine.system()
@@ -40,8 +39,8 @@ compiler_msvc = 'msvc'
 zstd_version = meson.project_version()

 zstd_h_file = join_paths(meson.current_source_dir(), '../../lib/zstd.h')
-GetZstdLibraryVersion_py = files('GetZstdLibraryVersion.py')
-r = run_command(python3, GetZstdLibraryVersion_py, zstd_h_file)
+GetZstdLibraryVersion_py = find_program('GetZstdLibraryVersion.py', native : true)
+r = run_command(GetZstdLibraryVersion_py, zstd_h_file)
 if r.returncode() == 0
  zstd_version = r.stdout().strip()
  message('Project version is now: @0@'.format(zstd_version))
@@ -0,0 +1,695 @@
+#!/usr/bin/env python3
+# ################################################################
+# Copyright (c) 2020-2020, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under both the BSD-style license (found in the
+# LICENSE file in the root directory of this source tree) and the GPLv2 (found
+# in the COPYING file in the root directory of this source tree).
+# You may select, at your option, one of the above-listed licenses.
+# ##########################################################################
+
+import argparse
+import contextlib
+import os
+import re
+import shutil
+import sys
+from typing import Optional
+
+
+INCLUDED_SUBDIRS = ["common", "compress", "decompress"]
+
+SKIPPED_FILES = [
+    "common/mem.h",
+    "common/zstd_deps.h",
+    "common/pool.c",
+    "common/pool.h",
+    "common/threading.c",
+    "common/threading.h",
+    "compress/zstdmt_compress.h",
+    "compress/zstdmt_compress.c",
+]
+
+XXHASH_FILES = [
+    "common/xxhash.c",
+    "common/xxhash.h",
+]
+
+
+class FileLines(object):
+    def __init__(self, filename):
+        self.filename = filename
+        with open(self.filename, "r") as f:
+            self.lines = f.readlines()
+
+    def write(self):
+        with open(self.filename, "w") as f:
+            f.write("".join(self.lines))
+
+
+class PartialPreprocessor(object):
+    """
+    Looks for simple ifdefs and ifndefs and replaces them.
+    Handles && and ||.
+    Has fancy logic to handle translating elifs to ifs.
+    Only looks for macros in the first part of the expression with no
+    parens.
+    Does not handle multi-line macros (only looks in first line).
+    """
+    def __init__(self, defs: [(str, Optional[str])], replaces: [(str, str)], undefs: [str]):
+        MACRO_GROUP = r"(?P<macro>[a-zA-Z_][a-zA-Z_0-9]*)"
+        ELIF_GROUP = r"(?P<elif>el)?"
+        OP_GROUP = r"(?P<op>&&|\|\|)?"
+
+        self._defs = {macro:value for macro, value in defs}
+        self._replaces = {macro:value for macro, value in replaces}
+        self._defs.update(self._replaces)
+        self._undefs = set(undefs)
+
+        self._define = re.compile(r"\s*#\s*define")
+        self._if = re.compile(r"\s*#\s*if")
+        self._elif = re.compile(r"\s*#\s*(?P<elif>el)if")
+        self._else = re.compile(r"\s*#\s*(?P<else>else)")
+        self._endif = re.compile(r"\s*#\s*endif")
+
+        self._ifdef = re.compile(fr"\s*#\s*if(?P<not>n)?def {MACRO_GROUP}\s*")
+        self._if_defined = re.compile(
+            fr"\s*#\s*{ELIF_GROUP}if\s+(?P<not>!)?\s*defined\s*\(\s*{MACRO_GROUP}\s*\)\s*{OP_GROUP}"
+        )
+        self._if_defined_value = re.compile(
+            fr"\s*#\s*{ELIF_GROUP}if\s+defined\s*\(\s*{MACRO_GROUP}\s*\)\s*"
+            fr"(?P<op>&&)\s*"
+            fr"(?P<openp>\()?\s*"
+            fr"(?P<macro2>[a-zA-Z_][a-zA-Z_0-9]*)\s*"
+            fr"(?P<cmp>[=><!]+)\s*"
+            fr"(?P<value>[0-9]*)\s*"
+            fr"(?P<closep>\))?\s*"
+        )
+        self._if_true = re.compile(
+            fr"\s*#\s*{ELIF_GROUP}if\s+{MACRO_GROUP}\s*{OP_GROUP}"
+        )
+
+        self._c_comment = re.compile(r"/\*.*?\*/")
+        self._cpp_comment = re.compile(r"//")
+
+    def _log(self, *args, **kwargs):
+        print(*args, **kwargs)
+
+    def _strip_comments(self, line):
+        # First strip c-style comments (may include //)
+        while True:
+            m = self._c_comment.search(line)
+            if m is None:
+                break
+            line = line[:m.start()] + line[m.end():]
+
+        # Then strip cpp-style comments
+        m = self._cpp_comment.search(line)
+        if m is not None:
+            line = line[:m.start()]
+
+        return line
+
+    def _fixup_indentation(self, macro, replace: [str]):
+        if len(replace) == 0:
+            return replace
+        if len(replace) == 1 and self._define.match(replace[0]) is None:
+            # If there is only one line, only replace defines
+            return replace
+
+
+        all_pound = True
+        for line in replace:
+            if not line.startswith('#'):
+                all_pound = False
+        if all_pound:
+            replace = [line[1:] for line in replace]
+
+        min_spaces = len(replace[0])
+        for line in replace:
+            spaces = 0
+            for i, c in enumerate(line):
+                if c != ' ':
+                    # Non-preprocessor line ==> skip the fixup
+                    if not all_pound and c != '#':
+                        return replace
+                    spaces = i
+                    break
+            min_spaces = min(min_spaces, spaces)
+
+        replace = [line[min_spaces:] for line in replace]
+
+        if all_pound:
+            replace = ["#" + line for line in replace]
+
+        return replace
+
+    def _handle_if_block(self, macro, idx, is_true, prepend):
+        """
+        Remove the #if or #elif block starting on this line.
+        """
+        REMOVE_ONE = 0
+        KEEP_ONE = 1
+        REMOVE_REST = 2
+
+        if is_true:
+            state = KEEP_ONE
+        else:
+            state = REMOVE_ONE
+
+        line = self._inlines[idx]
+        is_if = self._if.match(line) is not None
+        assert is_if or self._elif.match(line) is not None
+        depth = 0
+
+        start_idx = idx
+
+        idx += 1
+        replace = prepend
+        finished = False
+        while idx < len(self._inlines):
+            line = self._inlines[idx]
+            # Nested if statement
+            if self._if.match(line):
+                depth += 1
+                idx += 1
+                continue
+            # We're inside a nested statement
+            if depth > 0:
+                if self._endif.match(line):
+                    depth -= 1
+                idx += 1
+                continue
+
+            # We're at the original depth
+
+            # Looking only for an endif.
+            # We've found a true statement, but haven't
+            # completely elided the if block, so we just
+            # remove the remainder.
+            if state == REMOVE_REST:
+                if self._endif.match(line):
+                    if is_if:
+                        # Remove the endif because we took the first if
+                        idx += 1
+                    finished = True
+                    break
+                idx += 1
+                continue
+
+            if state == KEEP_ONE:
+                m = self._elif.match(line)
+                if self._endif.match(line):
+                    replace += self._inlines[start_idx + 1:idx]
+                    idx += 1
+                    finished = True
+                    break
+                if self._elif.match(line) or self._else.match(line):
+                    replace += self._inlines[start_idx + 1:idx]
+                    state = REMOVE_REST
+                idx += 1
+                continue
+
+            if state == REMOVE_ONE:
+                m = self._elif.match(line)
+                if m is not None:
+                    if is_if:
+                        idx += 1
+                        b = m.start('elif')
+                        e = m.end('elif')
+                        assert e - b == 2
+                        replace.append(line[:b] + line[e:])
+                    finished = True
+                    break
+                m = self._else.match(line)
+                if m is not None:
+                    if is_if:
+                        idx += 1
+                        while self._endif.match(self._inlines[idx]) is None:
+                            replace.append(self._inlines[idx])
+                            idx += 1
+                        idx += 1
+                    finished = True
+                    break
+                if self._endif.match(line):
+                    if is_if:
+                        # Remove the endif because no other elifs
+                        idx += 1
+                    finished = True
+                    break
+                idx += 1
+                continue
+        if not finished:
+            raise RuntimeError("Unterminated if block!")
+
+        replace = self._fixup_indentation(macro, replace)
+
+        self._log(f"\tHardwiring {macro}")
+        if start_idx > 0:
+            self._log(f"\t\t  {self._inlines[start_idx - 1][:-1]}")
+        for x in range(start_idx, idx):
+            self._log(f"\t\t- {self._inlines[x][:-1]}")
+        for line in replace:
+            self._log(f"\t\t+ {line[:-1]}")
+        if idx < len(self._inlines):
+            self._log(f"\t\t  {self._inlines[idx][:-1]}")
+
+        return idx, replace
+
+    def _preprocess_once(self):
+        outlines = []
+        idx = 0
+        changed = False
+        while idx < len(self._inlines):
+            line = self._inlines[idx]
+            sline = self._strip_comments(line)
+            m = self._ifdef.fullmatch(sline)
+            if_true = False
+            if m is None:
+                m = self._if_defined_value.fullmatch(sline)
+            if m is None:
+                m = self._if_defined.match(sline)
+            if m is None:
+                m = self._if_true.match(sline)
+                if_true = (m is not None)
+            if m is None:
+                outlines.append(line)
+                idx += 1
+                continue
+
+            groups = m.groupdict()
+            macro = groups['macro']
+            op = groups.get('op')
+
+            if not (macro in self._defs or macro in self._undefs):
+                outlines.append(line)
+                idx += 1
+                continue
+
+            defined = macro in self._defs
+
+            # Needed variables set:
+            # resolved: Is the statement fully resolved?
+            # is_true: If resolved, is the statement true?
+            ifdef = False
+            if if_true:
+                if not defined:
+                    outlines.append(line)
+                    idx += 1
+                    continue
+
+                defined_value = self._defs[macro]
+                is_int = True
+                try:
+                    defined_value = int(defined_value)
+                except TypeError:
+                    is_int = False
+                except ValueError:
+                    is_int = False
+
+                resolved = is_int
+                is_true = (defined_value != 0)
+
+                if resolved and op is not None:
+                    if op == '&&':
+                        resolved = not is_true
+                    else:
+                        assert op == '||'
+                        resolved = is_true
+
+            else:
+                ifdef = groups.get('not') is None
+                elseif = groups.get('elif') is not None
+
+                macro2 = groups.get('macro2')
+                cmp = groups.get('cmp')
+                value = groups.get('value')
+                openp = groups.get('openp')
+                closep = groups.get('closep')
+
+                is_true = (ifdef == defined)
+                resolved = True
+                if op is not None:
+                    if op == '&&':
+                        resolved = not is_true
+                    else:
+                        assert op == '||'
+                        resolved = is_true
+
+                if macro2 is not None and not resolved:
+                    assert ifdef and defined and op == '&&' and cmp is not None
+                    # If the statment is true, but we have a single value check, then
+                    # check the value.
+                    defined_value = self._defs[macro]
+                    are_ints = True
+                    try:
+                        defined_value = int(defined_value)
+                        value = int(value)
+                    except TypeError:
+                        are_ints = False
+                    except ValueError:
+                        are_ints = False
+                    if (
+                            macro == macro2 and
+                            ((openp is None) == (closep is None)) and
+                            are_ints
+                    ):
+                        resolved = True
+                        if cmp == '<':
+                            is_true = defined_value < value
+                        elif cmp == '<=':
+                            is_true = defined_value <= value
+                        elif cmp == '==':
+                            is_true = defined_value == value
+                        elif cmp == '!=':
+                            is_true = defined_value != value
+                        elif cmp == '>=':
+                            is_true = defined_value >= value
+                        elif cmp == '>':
+                            is_true = defined_value > value
+                        else:
+                            resolved = False
+
+                if op is not None and not resolved:
+                    # Remove the first op in the line + spaces
+                    if op == '&&':
+                        opre = op
+                    else:
+                        assert op == '||'
+                        opre = r'\|\|'
+                    needle = re.compile(fr"(?P<if>\s*#\s*(el)?if\s+).*?(?P<op>{opre}\s*)")
+                    match = needle.match(line)
+                    assert match is not None
+                    newline = line[:match.end('if')] + line[match.end('op'):]
+
+                    self._log(f"\tHardwiring partially resolved {macro}")
+                    self._log(f"\t\t- {line[:-1]}")
+                    self._log(f"\t\t+ {newline[:-1]}")
+
+                    outlines.append(newline)
+                    idx += 1
+                    continue
+
+            # Skip any statements we cannot fully compute
+            if not resolved:
+                outlines.append(line)
+                idx += 1
+                continue
+
+            prepend = []
+            if macro in self._replaces:
+                assert not ifdef
+                assert op is None
+                value = self._replaces.pop(macro)
+                prepend = [f"#define {macro} {value}\n"]
+
+            idx, replace = self._handle_if_block(macro, idx, is_true, prepend)
+            outlines += replace
+            changed = True
+
+        return changed, outlines
+
+    def preprocess(self, filename):
+        with open(filename, 'r') as f:
+            self._inlines = f.readlines()
+        changed = True
+        iters = 0
+        while changed:
+            iters += 1
+            changed, outlines = self._preprocess_once()
+            self._inlines = outlines
+
+        with open(filename, 'w') as f:
+            f.write(''.join(self._inlines))
+
+
+class Freestanding(object):
+    def __init__(
+            self, zstd_deps: str, mem: str, source_lib: str, output_lib: str,
+            external_xxhash: bool, xxh64_state: Optional[str],
+            xxh64_prefix: Optional[str], rewritten_includes: [(str, str)],
+            defs: [(str, Optional[str])], replaces: [(str, str)],
+            undefs: [str], excludes: [str]
+    ):
+        self._zstd_deps = zstd_deps
+        self._mem = mem
+        self._src_lib = source_lib
+        self._dst_lib = output_lib
+        self._external_xxhash = external_xxhash
+        self._xxh64_state = xxh64_state
+        self._xxh64_prefix = xxh64_prefix
+        self._rewritten_includes = rewritten_includes
+        self._defs = defs
+        self._replaces = replaces
+        self._undefs = undefs
+        self._excludes = excludes
+
+    def _dst_lib_file_paths(self):
+        """
+        Yields all the file paths in the dst_lib.
+        """
+        for root, dirname, filenames in os.walk(self._dst_lib):
+            for filename in filenames:
+                filepath = os.path.join(root, filename)
+                yield filepath
+
+    def _log(self, *args, **kwargs):
+        print(*args, **kwargs)
+
+    def _copy_file(self, lib_path):
+        if not (lib_path.endswith(".c") or lib_path.endswith(".h")):
+            return
+        if lib_path in SKIPPED_FILES:
+            self._log(f"\tSkipping file: {lib_path}")
+            return
+        if self._external_xxhash and lib_path in XXHASH_FILES:
+            self._log(f"\tSkipping xxhash file: {lib_path}")
+            return
+
+        src_path = os.path.join(self._src_lib, lib_path)
+        dst_path = os.path.join(self._dst_lib, lib_path)
+        self._log(f"\tCopying: {src_path} -> {dst_path}")
+        shutil.copyfile(src_path, dst_path)
+    
+    def _copy_source_lib(self):
+        self._log("Copying source library into output library")
+
+        assert os.path.exists(self._src_lib)
+        os.makedirs(self._dst_lib, exist_ok=True)
+        self._copy_file("zstd.h")
+        for subdir in INCLUDED_SUBDIRS:
+            src_dir = os.path.join(self._src_lib, subdir)
+            dst_dir = os.path.join(self._dst_lib, subdir)
+            
+            assert os.path.exists(src_dir)
+            os.makedirs(dst_dir, exist_ok=True)
+
+            for filename in os.listdir(src_dir):
+                lib_path = os.path.join(subdir, filename)
+                self._copy_file(lib_path)
+    
+    def _copy_zstd_deps(self):
+        dst_zstd_deps = os.path.join(self._dst_lib, "common", "zstd_deps.h")
+        self._log(f"Copying zstd_deps: {self._zstd_deps} -> {dst_zstd_deps}")
+        shutil.copyfile(self._zstd_deps, dst_zstd_deps)
+
+    def _copy_mem(self):
+        dst_mem = os.path.join(self._dst_lib, "common", "mem.h")
+        self._log(f"Copying mem: {self._mem} -> {dst_mem}")
+        shutil.copyfile(self._mem, dst_mem)
+
+    def _hardwire_preprocessor(self, name: str, value: Optional[str] = None, undef=False):
+        """
+        If value=None then hardwire that it is defined, but not what the value is.
+        If undef=True then value must be None.
+        If value='' then the macro is defined to '' exactly.
+        """
+        assert not (undef and value is not None)
+        for filepath in self._dst_lib_file_paths():
+            file = FileLines(filepath)
+    
+    def _hardwire_defines(self):
+        self._log("Hardwiring macros")
+        partial_preprocessor = PartialPreprocessor(self._defs, self._replaces, self._undefs)
+        for filepath in self._dst_lib_file_paths():
+            partial_preprocessor.preprocess(filepath)
+
+    def _remove_excludes(self):
+        self._log("Removing excluded sections")
+        for exclude in self._excludes:
+            self._log(f"\tRemoving excluded sections for: {exclude}")
+            begin_re = re.compile(f"BEGIN {exclude}")
+            end_re = re.compile(f"END {exclude}")
+            for filepath in self._dst_lib_file_paths():
+                file = FileLines(filepath)
+                outlines = []
+                skipped = []
+                emit = True
+                for line in file.lines:
+                    if emit and begin_re.search(line) is not None:
+                        assert end_re.search(line) is None
+                        emit = False
+                    if emit:
+                        outlines.append(line)
+                    else:
+                        skipped.append(line)
+                        if end_re.search(line) is not None:
+                            assert begin_re.search(line) is None
+                            self._log(f"\t\tRemoving excluded section: {exclude}") 
+                            for s in skipped:
+                                self._log(f"\t\t\t- {s}")
+                            emit = True
+                            skipped = []
+                if not emit:
+                    raise RuntimeError("Excluded section unfinished!")
+                file.lines = outlines
+                file.write()
+
+    def _rewrite_include(self, original, rewritten):
+        self._log(f"\tRewriting include: {original} -> {rewritten}")
+        regex = re.compile(f"\\s*#\\s*include\\s*(?P<include>{original})")
+        for filepath in self._dst_lib_file_paths():
+            file = FileLines(filepath)
+            for i, line in enumerate(file.lines):
+                match = regex.match(line)
+                if match is None:
+                    continue
+                s = match.start('include')
+                e = match.end('include')
+                file.lines[i] = line[:s] + rewritten + line[e:]
+            file.write()
+    
+    def _rewrite_includes(self):
+        self._log("Rewriting includes")
+        for original, rewritten in self._rewritten_includes:
+            self._rewrite_include(original, rewritten)
+    
+    def _replace_xxh64_prefix(self):
+        if self._xxh64_prefix is None:
+            return
+        self._log(f"Replacing XXH64 prefix with {self._xxh64_prefix}")
+        replacements = []
+        if self._xxh64_state is not None:
+            replacements.append(
+                (re.compile(r"([^\w]|^)(?P<orig>XXH64_state_t)([^\w]|$)"), self._xxh64_state)
+            )
+        if self._xxh64_prefix is not None:
+            replacements.append(
+                (re.compile(r"([^\w]|^)(?P<orig>XXH64)_"), self._xxh64_prefix)
+            )
+        for filepath in self._dst_lib_file_paths():
+            file = FileLines(filepath)
+            for i, line in enumerate(file.lines):
+                modified = False
+                for regex, replacement in replacements:
+                    match = regex.search(line)
+                    while match is not None:
+                        modified = True
+                        b = match.start('orig')
+                        e = match.end('orig')
+                        line = line[:b] + replacement + line[e:]
+                        match = regex.search(line)
+                if modified:
+                    self._log(f"\t- {file.lines[i][:-1]}")
+                    self._log(f"\t+ {line[:-1]}")
+                file.lines[i] = line
+            file.write()
+
+    def go(self):
+        self._copy_source_lib()
+        self._copy_zstd_deps()
+        self._copy_mem()
+        self._hardwire_defines()
+        self._remove_excludes()
+        self._rewrite_includes()
+        self._replace_xxh64_prefix()
+
+
+def parse_optional_pair(defines: [str]) -> [(str, Optional[str])]:
+    output = []
+    for define in defines:
+        parsed = define.split('=')
+        if len(parsed) == 1:
+            output.append((parsed[0], None))
+        elif len(parsed) == 2:
+            output.append((parsed[0], parsed[1]))
+        else:
+            raise RuntimeError(f"Bad define: {define}")
+    return output
+
+
+def parse_pair(rewritten_includes: [str]) -> [(str, str)]:
+    output = []
+    for rewritten_include in rewritten_includes:
+        parsed = rewritten_include.split('=')
+        if len(parsed) == 2:
+            output.append((parsed[0], parsed[1]))
+        else:
+            raise RuntimeError(f"Bad rewritten include: {rewritten_include}")
+    return output
+
+
+
+def main(name, args):
+    parser = argparse.ArgumentParser(prog=name)
+    parser.add_argument("--zstd-deps", default="zstd_deps.h", help="Zstd dependencies file")
+    parser.add_argument("--mem", default="mem.h", help="Memory module")
+    parser.add_argument("--source-lib", default="../../lib", help="Location of the zstd library")
+    parser.add_argument("--output-lib", default="./freestanding_lib", help="Where to output the freestanding zstd library")
+    parser.add_argument("--xxhash", default=None, help="Alternate external xxhash include e.g. --xxhash='<xxhash.h>'. If set xxhash is not included.")
+    parser.add_argument("--xxh64-state", default=None, help="Alternate XXH64 state type (excluding _) e.g. --xxh64-state='struct xxh64_state'")
+    parser.add_argument("--xxh64-prefix", default=None, help="Alternate XXH64 function prefix (excluding _) e.g. --xxh64-prefix=xxh64")
+    parser.add_argument("--rewrite-include", default=[], dest="rewritten_includes", action="append", help="Rewrite an include REGEX=NEW (e.g. '<stddef\\.h>=<linux/types.h>')")
+    parser.add_argument("-D", "--define", default=[], dest="defs", action="append", help="Pre-define this macro (can be passed multiple times)")
+    parser.add_argument("-U", "--undefine", default=[], dest="undefs", action="append", help="Pre-undefine this macro (can be passed mutliple times)")
+    parser.add_argument("-R", "--replace", default=[], dest="replaces", action="append", help="Pre-define this macro and replace the first ifndef block with its definition")
+    parser.add_argument("-E", "--exclude", default=[], dest="excludes", action="append", help="Exclude all lines between 'BEGIN <EXCLUDE>' and 'END <EXCLUDE>'")
+    args = parser.parse_args(args)
+
+    # Always remove threading
+    if "ZSTD_MULTITHREAD" not in args.undefs:
+        args.undefs.append("ZSTD_MULTITHREAD")
+
+    args.defs = parse_optional_pair(args.defs)
+    for name, _ in args.defs:
+        if name in args.undefs:
+            raise RuntimeError(f"{name} is both defined and undefined!")
+
+    args.replaces = parse_pair(args.replaces)
+    for name, _ in args.replaces:
+        if name in args.undefs or name in args.defs:
+            raise RuntimeError(f"{name} is both replaced and (un)defined!")
+
+    args.rewritten_includes = parse_pair(args.rewritten_includes)
+
+    external_xxhash = False
+    if args.xxhash is not None:
+        external_xxhash = True
+        args.rewritten_includes.append(('"(\\.\\./common/)?xxhash.h"', args.xxhash))
+
+    if args.xxh64_prefix is not None:
+        if not external_xxhash:
+            raise RuntimeError("--xxh64-prefix may only be used with --xxhash provided")
+
+    if args.xxh64_state is not None:
+        if not external_xxhash:
+            raise RuntimeError("--xxh64-state may only be used with --xxhash provided")
+
+    Freestanding(
+        args.zstd_deps,
+        args.mem,
+        args.source_lib,
+        args.output_lib,
+        external_xxhash,
+        args.xxh64_state,
+        args.xxh64_prefix,
+        args.rewritten_includes,
+        args.defs,
+        args.replaces,
+        args.undefs,
+        args.excludes
+    ).go()
+
+if __name__ == "__main__":
+    main(sys.argv[0], sys.argv[1:])
@@ -156,6 +156,18 @@ createDictionaryBuffer(const char* dictionaryName,
    }
 }

+static ZSTD_CDict* createCDictForDedicatedDictSearch(const void* dict, size_t dictSize, int compressionLevel)
+{
+    ZSTD_CCtx_params* params = ZSTD_createCCtxParams();
+    ZSTD_CCtxParams_init(params, compressionLevel);
+    ZSTD_CCtxParams_setParameter(params, ZSTD_c_enableDedicatedDictSearch, 1);
+    ZSTD_CCtxParams_setParameter(params, ZSTD_c_compressionLevel, compressionLevel);
+
+    ZSTD_CDict* cdict = ZSTD_createCDict_advanced2(dict, dictSize, ZSTD_dlm_byCopy, ZSTD_dct_auto, params, ZSTD_defaultCMem);
+
+    ZSTD_freeCCtxParams(params);
+    return cdict;
+}

 /*! BMK_loadFiles() :
 *  Loads `buffer`, with content from files listed within `fileNamesTable`.
@@ -449,12 +461,14 @@ static void freeCDictCollection(cdict_collection_t cdictc)
 }

 /* returns .buffers=NULL if operation fails */
-static cdict_collection_t createCDictCollection(const void* dictBuffer, size_t dictSize, size_t nbCDict, int cLevel)
+static cdict_collection_t createCDictCollection(const void* dictBuffer, size_t dictSize, size_t nbCDict, int cLevel, int dedicatedDictSearch)
 {
    ZSTD_CDict** const cdicts = malloc(nbCDict * sizeof(ZSTD_CDict*));
    if (cdicts==NULL) return kNullCDictCollection;
    for (size_t dictNb=0; dictNb < nbCDict; dictNb++) {
-        cdicts[dictNb] = ZSTD_createCDict(dictBuffer, dictSize, cLevel);
+        cdicts[dictNb] = dedicatedDictSearch ?
+            createCDictForDedicatedDictSearch(dictBuffer, dictSize, cLevel) :
+            ZSTD_createCDict(dictBuffer, dictSize, cLevel);
        CONTROL(cdicts[dictNb] != NULL);
    }
    cdict_collection_t cdictc;
@@ -720,7 +734,8 @@ int bench(const char** fileNameTable, unsigned nbFiles,
          const char* dictionary,
          size_t blockSize, int clevel,
          unsigned nbDictMax, unsigned nbBlocks,
-          unsigned nbRounds, int benchCompression)
+          unsigned nbRounds, int benchCompression,
+          int dedicatedDictSearch)
 {
    int result = 0;

@@ -775,7 +790,9 @@ int bench(const char** fileNameTable, unsigned nbFiles,
                                DICTSIZE);
    CONTROL(dictBuffer.ptr != NULL);

-    ZSTD_CDict* const cdict = ZSTD_createCDict(dictBuffer.ptr, dictBuffer.size, clevel);
+    ZSTD_CDict* const cdict = dedicatedDictSearch ?
+        createCDictForDedicatedDictSearch(dictBuffer.ptr, dictBuffer.size, clevel) :
+        ZSTD_createCDict(dictBuffer.ptr, dictBuffer.size, clevel);
    CONTROL(cdict != NULL);

    size_t const cTotalSizeNoDict = compressBlocks(NULL, dstSlices, srcSlices, NULL, clevel);
@@ -798,7 +815,7 @@ int bench(const char** fileNameTable, unsigned nbFiles,

    unsigned const nbDicts = nbDictMax ? nbDictMax : nbBlocks;

-    cdict_collection_t const cdictionaries = createCDictCollection(dictBuffer.ptr, dictBuffer.size, nbDicts, clevel);
+    cdict_collection_t const cdictionaries = createCDictCollection(dictBuffer.ptr, dictBuffer.size, nbDicts, clevel, dedicatedDictSearch);
    CONTROL(cdictionaries.cdicts != NULL);

    ddict_collection_t const ddictionaries = createDDictCollection(dictBuffer.ptr, dictBuffer.size, nbDicts);
@@ -924,6 +941,7 @@ int main (int argc, const char** argv)
 {
    int recursiveMode = 0;
    int benchCompression = 1;
+    int dedicatedDictSearch = 0;
    unsigned nbRounds = BENCH_TIME_DEFAULT_S;
    const char* const exeName = argv[0];

@@ -953,6 +971,7 @@ int main (int argc, const char** argv)
        if (longCommandWArg(&argument, "--nbDicts=")) { nbDicts = readU32FromChar(&argument); continue; }
        if (longCommandWArg(&argument, "--nbBlocks=")) { nbBlocks = readU32FromChar(&argument); continue; }
        if (longCommandWArg(&argument, "--clevel=")) { cLevel = (int)readU32FromChar(&argument); continue; }
+        if (longCommandWArg(&argument, "--dedicated-dict-search")) { dedicatedDictSearch = 1; continue; }
        if (longCommandWArg(&argument, "-")) { cLevel = (int)readU32FromChar(&argument); continue; }
        /* anything that's not a command is a filename */
        nameTable[nameIdx++] = argument;
@@ -970,7 +989,7 @@ int main (int argc, const char** argv)
        nameTable = NULL;  /* UTIL_createFileNamesTable() takes ownership of nameTable */
    }

-    int result = bench(filenameTable->fileNames, (unsigned)filenameTable->tableSize, dictionary, blockSize, cLevel, nbDicts, nbBlocks, nbRounds, benchCompression);
+    int result = bench(filenameTable->fileNames, (unsigned)filenameTable->tableSize, dictionary, blockSize, cLevel, nbDicts, nbBlocks, nbRounds, benchCompression, dedicatedDictSearch);

    UTIL_freeFileNamesTable(filenameTable);
    free(nameTable);
@@ -1,122 +0,0 @@
-From 308795a7713ca6fcd468b60fba9a2fca99cee6a0 Mon Sep 17 00:00:00 2001
-From: Nick Terrell <terrelln@fb.com>
-Date: Tue, 8 Aug 2017 19:20:25 -0700
-Subject: [PATCH v5 0/5] Add xxhash and zstd modules
-
-Hi all,
-
-This patch set adds xxhash, zstd compression, and zstd decompression
-modules. It also adds zstd support to BtrFS and SquashFS.
-
-Each patch has relevant summaries, benchmarks, and tests.
-
-Best,
-Nick Terrell
-
-Changelog:
-
-v1 -> v2:
- Make pointer in lib/xxhash.c:394 non-const (1/5)
- Use div_u64() for division of u64s (2/5)
- Reduce stack usage of ZSTD_compressSequences(), ZSTD_buildSeqTable(),
-  ZSTD_decompressSequencesLong(), FSE_buildDTable(), FSE_decompress_wksp(),
-  HUF_writeCTable(), HUF_readStats(), HUF_readCTable(),
-  HUF_compressWeights(), HUF_readDTableX2(), and HUF_readDTableX4() (2/5)
- No zstd function uses more than 400 B of stack space (2/5)
-
-v2 -> v3:
- Work around gcc-7 bug https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81388
-  (2/5)
- Fix bug in dictionary compression from upstream commit cc1522351f (2/5)
- Port upstream BtrFS commits e1ddce71d6, 389a6cfc2a, and 6acafd1eff (3/5)
- Change default compression level for BtrFS to 3 (3/5)
-
-v3 -> v4:
- Fix compiler warnings (2/5)
- Add missing includes (3/5)
- Fix minor linter warnings (3/5, 4/5)
- Add crypto patch (5/5)
-
-v4 -> v5:
- Fix rare compression bug from upstream commit 308047eb5d (2/5)
- Fix bug introduced in v3 when working around the gcc-7 bug (2/5)
- Fix ZSTD_DStream initialization code in squashfs (4/5)
- Fix patch documentation for patches written by Sean Purcell (4/5)
-
-Nick Terrell (5):
-  lib: Add xxhash module
-  lib: Add zstd modules
-  btrfs: Add zstd support
-  squashfs: Add zstd support
-  crypto: Add zstd support
-
- crypto/Kconfig             |    9 +
- crypto/Makefile            |    1 +
- crypto/testmgr.c           |   10 +
- crypto/testmgr.h           |   71 +
- crypto/zstd.c              |  265 ++++
- fs/btrfs/Kconfig           |    2 +
- fs/btrfs/Makefile          |    2 +-
- fs/btrfs/compression.c     |    1 +
- fs/btrfs/compression.h     |    6 +-
- fs/btrfs/ctree.h           |    1 +
- fs/btrfs/disk-io.c         |    2 +
- fs/btrfs/ioctl.c           |    6 +-
- fs/btrfs/props.c           |    6 +
- fs/btrfs/super.c           |   12 +-
- fs/btrfs/sysfs.c           |    2 +
- fs/btrfs/zstd.c            |  432 ++++++
- fs/squashfs/Kconfig        |   14 +
- fs/squashfs/Makefile       |    1 +
- fs/squashfs/decompressor.c |    7 +
- fs/squashfs/decompressor.h |    4 +
- fs/squashfs/squashfs_fs.h  |    1 +
- fs/squashfs/zstd_wrapper.c |  151 ++
- include/linux/xxhash.h     |  236 +++
- include/linux/zstd.h       | 1157 +++++++++++++++
- include/uapi/linux/btrfs.h |    8 +-
- lib/Kconfig                |   11 +
- lib/Makefile               |    3 +
- lib/xxhash.c               |  500 +++++++
- lib/zstd/Makefile          |   18 +
- lib/zstd/bitstream.h       |  374 +++++
- lib/zstd/compress.c        | 3484 ++++++++++++++++++++++++++++++++++++++++++++
- lib/zstd/decompress.c      | 2528 ++++++++++++++++++++++++++++++++
- lib/zstd/entropy_common.c  |  243 +++
- lib/zstd/error_private.h   |   53 +
- lib/zstd/fse.h             |  575 ++++++++
- lib/zstd/fse_compress.c    |  795 ++++++++++
- lib/zstd/fse_decompress.c  |  332 +++++
- lib/zstd/huf.h             |  212 +++
- lib/zstd/huf_compress.c    |  770 ++++++++++
- lib/zstd/huf_decompress.c  |  960 ++++++++++++
- lib/zstd/mem.h             |  151 ++
- lib/zstd/zstd_common.c     |   75 +
- lib/zstd/zstd_internal.h   |  263 ++++
- lib/zstd/zstd_opt.h        | 1014 +++++++++++++
- 44 files changed, 14756 insertions(+), 12 deletions(-)
- create mode 100644 crypto/zstd.c
- create mode 100644 fs/btrfs/zstd.c
- create mode 100644 fs/squashfs/zstd_wrapper.c
- create mode 100644 include/linux/xxhash.h
- create mode 100644 include/linux/zstd.h
- create mode 100644 lib/xxhash.c
- create mode 100644 lib/zstd/Makefile
- create mode 100644 lib/zstd/bitstream.h
- create mode 100644 lib/zstd/compress.c
- create mode 100644 lib/zstd/decompress.c
- create mode 100644 lib/zstd/entropy_common.c
- create mode 100644 lib/zstd/error_private.h
- create mode 100644 lib/zstd/fse.h
- create mode 100644 lib/zstd/fse_compress.c
- create mode 100644 lib/zstd/fse_decompress.c
- create mode 100644 lib/zstd/huf.h
- create mode 100644 lib/zstd/huf_compress.c
- create mode 100644 lib/zstd/huf_decompress.c
- create mode 100644 lib/zstd/mem.h
- create mode 100644 lib/zstd/zstd_common.c
- create mode 100644 lib/zstd/zstd_internal.h
- create mode 100644 lib/zstd/zstd_opt.h
-
--
-2.9.3
@@ -1,862 +0,0 @@
-From a4b1ffb6e89bbccd519f9afa0910635668436105 Mon Sep 17 00:00:00 2001
-From: Nick Terrell <terrelln@fb.com>
-Date: Mon, 17 Jul 2017 17:07:18 -0700
-Subject: [PATCH v5 1/5] lib: Add xxhash module
-
-Adds xxhash kernel module with xxh32 and xxh64 hashes. xxhash is an
-extremely fast non-cryptographic hash algorithm for checksumming.
-The zstd compression and decompression modules added in the next patch
-require xxhash. I extracted it out from zstd since it is useful on its
-own. I copied the code from the upstream XXHash source repository and
-translated it into kernel style. I ran benchmarks and tests in the kernel
-and tests in userland.
-
-I benchmarked xxhash as a special character device. I ran in four modes,
-no-op, xxh32, xxh64, and crc32. The no-op mode simply copies the data to
-kernel space and ignores it. The xxh32, xxh64, and crc32 modes compute
-hashes on the copied data. I also ran it with four different buffer sizes.
-The benchmark file is located in the upstream zstd source repository under
-`contrib/linux-kernel/xxhash_test.c` [1].
-
-I ran the benchmarks on a Ubuntu 14.04 VM with 2 cores and 4 GiB of RAM.
-The VM is running on a MacBook Pro with a 3.1 GHz Intel Core i7 processor,
-16 GB of RAM, and a SSD. I benchmarked using the file `filesystem.squashfs`
-from `ubuntu-16.10-desktop-amd64.iso`, which is 1,536,217,088 B large.
-Run the following commands for the benchmark:
-
-    modprobe xxhash_test
-    mknod xxhash_test c 245 0
-    time cp filesystem.squashfs xxhash_test
-
-The time is reported by the time of the userland `cp`.
-The GB/s is computed with
-
-    1,536,217,008 B / time(buffer size, hash)
-
-which includes the time to copy from userland.
-The Normalized GB/s is computed with
-
-    1,536,217,088 B / (time(buffer size, hash) - time(buffer size, none)).
-
-
-| Buffer Size (B) | Hash  | Time (s) | GB/s | Adjusted GB/s |
-|-----------------|-------|----------|------|---------------|
-|            1024 | none  |    0.408 | 3.77 |             - |
-|            1024 | xxh32 |    0.649 | 2.37 |          6.37 |
-|            1024 | xxh64 |    0.542 | 2.83 |         11.46 |
-|            1024 | crc32 |    1.290 | 1.19 |          1.74 |
-|            4096 | none  |    0.380 | 4.04 |             - |
-|            4096 | xxh32 |    0.645 | 2.38 |          5.79 |
-|            4096 | xxh64 |    0.500 | 3.07 |         12.80 |
-|            4096 | crc32 |    1.168 | 1.32 |          1.95 |
-|            8192 | none  |    0.351 | 4.38 |             - |
-|            8192 | xxh32 |    0.614 | 2.50 |          5.84 |
-|            8192 | xxh64 |    0.464 | 3.31 |         13.60 |
-|            8192 | crc32 |    1.163 | 1.32 |          1.89 |
-|           16384 | none  |    0.346 | 4.43 |             - |
-|           16384 | xxh32 |    0.590 | 2.60 |          6.30 |
-|           16384 | xxh64 |    0.466 | 3.30 |         12.80 |
-|           16384 | crc32 |    1.183 | 1.30 |          1.84 |
-
-Tested in userland using the test-suite in the zstd repo under
-`contrib/linux-kernel/test/XXHashUserlandTest.cpp` [2] by mocking the
-kernel functions. A line in each branch of every function in `xxhash.c`
-was commented out to ensure that the test-suite fails. Additionally
-tested while testing zstd and with SMHasher [3].
-
-[1] https://phabricator.intern.facebook.com/P57526246
-[2] https://github.com/facebook/zstd/blob/dev/contrib/linux-kernel/test/XXHashUserlandTest.cpp
-[3] https://github.com/aappleby/smhasher
-
-zstd source repository: https://github.com/facebook/zstd
-XXHash source repository: https://github.com/cyan4973/xxhash
-
-Signed-off-by: Nick Terrell <terrelln@fb.com>
---
-v1 -> v2:
- Make pointer in lib/xxhash.c:394 non-const
-
- include/linux/xxhash.h | 236 +++++++++++++++++++++++
- lib/Kconfig            |   3 +
- lib/Makefile           |   1 +
- lib/xxhash.c           | 500 +++++++++++++++++++++++++++++++++++++++++++++++++
- 4 files changed, 740 insertions(+)
- create mode 100644 include/linux/xxhash.h
- create mode 100644 lib/xxhash.c
-
-diff --git a/include/linux/xxhash.h b/include/linux/xxhash.h
-new file mode 100644
-index 0000000..9e1f42c
--- /dev/null
-+++ b/include/linux/xxhash.h
-@@ -0,0 +1,236 @@
-+/*
-+ * xxHash - Extremely Fast Hash algorithm
-+ * Copyright (C) 2012-2016, Yann Collet.
-+ *
-+ * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
-+ *
-+ * Redistribution and use in source and binary forms, with or without
-+ * modification, are permitted provided that the following conditions are
-+ * met:
-+ *
-+ *   * Redistributions of source code must retain the above copyright
-+ *     notice, this list of conditions and the following disclaimer.
-+ *   * Redistributions in binary form must reproduce the above
-+ *     copyright notice, this list of conditions and the following disclaimer
-+ *     in the documentation and/or other materials provided with the
-+ *     distribution.
-+ *
-+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-+ *
-+ * This program is free software; you can redistribute it and/or modify it under
-+ * the terms of the GNU General Public License version 2 as published by the
-+ * Free Software Foundation. This program is dual-licensed; you may select
-+ * either version 2 of the GNU General Public License ("GPL") or BSD license
-+ * ("BSD").
-+ *
-+ * You can contact the author at:
-+ * - xxHash homepage: http://cyan4973.github.io/xxHash/
-+ * - xxHash source repository: https://github.com/Cyan4973/xxHash
-+ */
-+
-+/*
-+ * Notice extracted from xxHash homepage:
-+ *
-+ * xxHash is an extremely fast Hash algorithm, running at RAM speed limits.
-+ * It also successfully passes all tests from the SMHasher suite.
-+ *
-+ * Comparison (single thread, Windows Seven 32 bits, using SMHasher on a Core 2
-+ * Duo @3GHz)
-+ *
-+ * Name            Speed       Q.Score   Author
-+ * xxHash          5.4 GB/s     10
-+ * CrapWow         3.2 GB/s      2       Andrew
-+ * MumurHash 3a    2.7 GB/s     10       Austin Appleby
-+ * SpookyHash      2.0 GB/s     10       Bob Jenkins
-+ * SBox            1.4 GB/s      9       Bret Mulvey
-+ * Lookup3         1.2 GB/s      9       Bob Jenkins
-+ * SuperFastHash   1.2 GB/s      1       Paul Hsieh
-+ * CityHash64      1.05 GB/s    10       Pike & Alakuijala
-+ * FNV             0.55 GB/s     5       Fowler, Noll, Vo
-+ * CRC32           0.43 GB/s     9
-+ * MD5-32          0.33 GB/s    10       Ronald L. Rivest
-+ * SHA1-32         0.28 GB/s    10
-+ *
-+ * Q.Score is a measure of quality of the hash function.
-+ * It depends on successfully passing SMHasher test set.
-+ * 10 is a perfect score.
-+ *
-+ * A 64-bits version, named xxh64 offers much better speed,
-+ * but for 64-bits applications only.
-+ * Name     Speed on 64 bits    Speed on 32 bits
-+ * xxh64       13.8 GB/s            1.9 GB/s
-+ * xxh32        6.8 GB/s            6.0 GB/s
-+ */
-+
-+#ifndef XXHASH_H
-+#define XXHASH_H
-+
-+#include <linux/types.h>
-+
-+/*-****************************
-+ * Simple Hash Functions
-+ *****************************/
-+
-+/**
-+ * xxh32() - calculate the 32-bit hash of the input with a given seed.
-+ *
-+ * @input:  The data to hash.
-+ * @length: The length of the data to hash.
-+ * @seed:   The seed can be used to alter the result predictably.
-+ *
-+ * Speed on Core 2 Duo @ 3 GHz (single thread, SMHasher benchmark) : 5.4 GB/s
-+ *
-+ * Return:  The 32-bit hash of the data.
-+ */
-+uint32_t xxh32(const void *input, size_t length, uint32_t seed);
-+
-+/**
-+ * xxh64() - calculate the 64-bit hash of the input with a given seed.
-+ *
-+ * @input:  The data to hash.
-+ * @length: The length of the data to hash.
-+ * @seed:   The seed can be used to alter the result predictably.
-+ *
-+ * This function runs 2x faster on 64-bit systems, but slower on 32-bit systems.
-+ *
-+ * Return:  The 64-bit hash of the data.
-+ */
-+uint64_t xxh64(const void *input, size_t length, uint64_t seed);
-+
-+/*-****************************
-+ * Streaming Hash Functions
-+ *****************************/
-+
-+/*
-+ * These definitions are only meant to allow allocation of XXH state
-+ * statically, on stack, or in a struct for example.
-+ * Do not use members directly.
-+ */
-+
-+/**
-+ * struct xxh32_state - private xxh32 state, do not use members directly
-+ */
-+struct xxh32_state {
-+	uint32_t total_len_32;
-+	uint32_t large_len;
-+	uint32_t v1;
-+	uint32_t v2;
-+	uint32_t v3;
-+	uint32_t v4;
-+	uint32_t mem32[4];
-+	uint32_t memsize;
-+};
-+
-+/**
-+ * struct xxh32_state - private xxh64 state, do not use members directly
-+ */
-+struct xxh64_state {
-+	uint64_t total_len;
-+	uint64_t v1;
-+	uint64_t v2;
-+	uint64_t v3;
-+	uint64_t v4;
-+	uint64_t mem64[4];
-+	uint32_t memsize;
-+};
-+
-+/**
-+ * xxh32_reset() - reset the xxh32 state to start a new hashing operation
-+ *
-+ * @state: The xxh32 state to reset.
-+ * @seed:  Initialize the hash state with this seed.
-+ *
-+ * Call this function on any xxh32_state to prepare for a new hashing operation.
-+ */
-+void xxh32_reset(struct xxh32_state *state, uint32_t seed);
-+
-+/**
-+ * xxh32_update() - hash the data given and update the xxh32 state
-+ *
-+ * @state:  The xxh32 state to update.
-+ * @input:  The data to hash.
-+ * @length: The length of the data to hash.
-+ *
-+ * After calling xxh32_reset() call xxh32_update() as many times as necessary.
-+ *
-+ * Return:  Zero on success, otherwise an error code.
-+ */
-+int xxh32_update(struct xxh32_state *state, const void *input, size_t length);
-+
-+/**
-+ * xxh32_digest() - produce the current xxh32 hash
-+ *
-+ * @state: Produce the current xxh32 hash of this state.
-+ *
-+ * A hash value can be produced at any time. It is still possible to continue
-+ * inserting input into the hash state after a call to xxh32_digest(), and
-+ * generate new hashes later on, by calling xxh32_digest() again.
-+ *
-+ * Return: The xxh32 hash stored in the state.
-+ */
-+uint32_t xxh32_digest(const struct xxh32_state *state);
-+
-+/**
-+ * xxh64_reset() - reset the xxh64 state to start a new hashing operation
-+ *
-+ * @state: The xxh64 state to reset.
-+ * @seed:  Initialize the hash state with this seed.
-+ */
-+void xxh64_reset(struct xxh64_state *state, uint64_t seed);
-+
-+/**
-+ * xxh64_update() - hash the data given and update the xxh64 state
-+ * @state:  The xxh64 state to update.
-+ * @input:  The data to hash.
-+ * @length: The length of the data to hash.
-+ *
-+ * After calling xxh64_reset() call xxh64_update() as many times as necessary.
-+ *
-+ * Return:  Zero on success, otherwise an error code.
-+ */
-+int xxh64_update(struct xxh64_state *state, const void *input, size_t length);
-+
-+/**
-+ * xxh64_digest() - produce the current xxh64 hash
-+ *
-+ * @state: Produce the current xxh64 hash of this state.
-+ *
-+ * A hash value can be produced at any time. It is still possible to continue
-+ * inserting input into the hash state after a call to xxh64_digest(), and
-+ * generate new hashes later on, by calling xxh64_digest() again.
-+ *
-+ * Return: The xxh64 hash stored in the state.
-+ */
-+uint64_t xxh64_digest(const struct xxh64_state *state);
-+
-+/*-**************************
-+ * Utils
-+ ***************************/
-+
-+/**
-+ * xxh32_copy_state() - copy the source state into the destination state
-+ *
-+ * @src: The source xxh32 state.
-+ * @dst: The destination xxh32 state.
-+ */
-+void xxh32_copy_state(struct xxh32_state *dst, const struct xxh32_state *src);
-+
-+/**
-+ * xxh64_copy_state() - copy the source state into the destination state
-+ *
-+ * @src: The source xxh64 state.
-+ * @dst: The destination xxh64 state.
-+ */
-+void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src);
-+
-+#endif /* XXHASH_H */
-diff --git a/lib/Kconfig b/lib/Kconfig
-index 6762529..5e7541f 100644
--- a/lib/Kconfig
-+++ b/lib/Kconfig
-@@ -192,6 +192,9 @@ config CRC8
- 	  when they need to do cyclic redundancy check according CRC8
- 	  algorithm. Module will be called crc8.
-
-+config XXHASH
-+	tristate
-+
- config AUDIT_GENERIC
- 	bool
- 	depends on AUDIT && !AUDIT_ARCH
-diff --git a/lib/Makefile b/lib/Makefile
-index 40c1837..d06b68a 100644
--- a/lib/Makefile
-+++ b/lib/Makefile
-@@ -102,6 +102,7 @@ obj-$(CONFIG_CRC4)	+= crc4.o
- obj-$(CONFIG_CRC7)	+= crc7.o
- obj-$(CONFIG_LIBCRC32C)	+= libcrc32c.o
- obj-$(CONFIG_CRC8)	+= crc8.o
-+obj-$(CONFIG_XXHASH)	+= xxhash.o
- obj-$(CONFIG_GENERIC_ALLOCATOR) += genalloc.o
-
- obj-$(CONFIG_842_COMPRESS) += 842/
-diff --git a/lib/xxhash.c b/lib/xxhash.c
-new file mode 100644
-index 0000000..aa61e2a
--- /dev/null
-+++ b/lib/xxhash.c
-@@ -0,0 +1,500 @@
-+/*
-+ * xxHash - Extremely Fast Hash algorithm
-+ * Copyright (C) 2012-2016, Yann Collet.
-+ *
-+ * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
-+ *
-+ * Redistribution and use in source and binary forms, with or without
-+ * modification, are permitted provided that the following conditions are
-+ * met:
-+ *
-+ *   * Redistributions of source code must retain the above copyright
-+ *     notice, this list of conditions and the following disclaimer.
-+ *   * Redistributions in binary form must reproduce the above
-+ *     copyright notice, this list of conditions and the following disclaimer
-+ *     in the documentation and/or other materials provided with the
-+ *     distribution.
-+ *
-+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
-+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
-+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
-+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
-+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
-+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
-+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
-+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
-+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
-+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
-+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
-+ *
-+ * This program is free software; you can redistribute it and/or modify it under
-+ * the terms of the GNU General Public License version 2 as published by the
-+ * Free Software Foundation. This program is dual-licensed; you may select
-+ * either version 2 of the GNU General Public License ("GPL") or BSD license
-+ * ("BSD").
-+ *
-+ * You can contact the author at:
-+ * - xxHash homepage: http://cyan4973.github.io/xxHash/
-+ * - xxHash source repository: https://github.com/Cyan4973/xxHash
-+ */
-+
-+#include <asm/unaligned.h>
-+#include <linux/errno.h>
-+#include <linux/compiler.h>
-+#include <linux/kernel.h>
-+#include <linux/module.h>
-+#include <linux/string.h>
-+#include <linux/xxhash.h>
-+
-+/*-*************************************
-+ * Macros
-+ **************************************/
-+#define xxh_rotl32(x, r) ((x << r) | (x >> (32 - r)))
-+#define xxh_rotl64(x, r) ((x << r) | (x >> (64 - r)))
-+
-+#ifdef __LITTLE_ENDIAN
-+# define XXH_CPU_LITTLE_ENDIAN 1
-+#else
-+# define XXH_CPU_LITTLE_ENDIAN 0
-+#endif
-+
-+/*-*************************************
-+ * Constants
-+ **************************************/
-+static const uint32_t PRIME32_1 = 2654435761U;
-+static const uint32_t PRIME32_2 = 2246822519U;
-+static const uint32_t PRIME32_3 = 3266489917U;
-+static const uint32_t PRIME32_4 =  668265263U;
-+static const uint32_t PRIME32_5 =  374761393U;
-+
-+static const uint64_t PRIME64_1 = 11400714785074694791ULL;
-+static const uint64_t PRIME64_2 = 14029467366897019727ULL;
-+static const uint64_t PRIME64_3 =  1609587929392839161ULL;
-+static const uint64_t PRIME64_4 =  9650029242287828579ULL;
-+static const uint64_t PRIME64_5 =  2870177450012600261ULL;
-+
-+/*-**************************
-+ *  Utils
-+ ***************************/
-+void xxh32_copy_state(struct xxh32_state *dst, const struct xxh32_state *src)
-+{
-+	memcpy(dst, src, sizeof(*dst));
-+}
-+EXPORT_SYMBOL(xxh32_copy_state);
-+
-+void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src)
-+{
-+	memcpy(dst, src, sizeof(*dst));
-+}
-+EXPORT_SYMBOL(xxh64_copy_state);
-+
-+/*-***************************
-+ * Simple Hash Functions
-+ ****************************/
-+static uint32_t xxh32_round(uint32_t seed, const uint32_t input)
-+{
-+	seed += input * PRIME32_2;
-+	seed = xxh_rotl32(seed, 13);
-+	seed *= PRIME32_1;
-+	return seed;
-+}
-+
-+uint32_t xxh32(const void *input, const size_t len, const uint32_t seed)
-+{
-+	const uint8_t *p = (const uint8_t *)input;
-+	const uint8_t *b_end = p + len;
-+	uint32_t h32;
-+
-+	if (len >= 16) {
-+		const uint8_t *const limit = b_end - 16;
-+		uint32_t v1 = seed + PRIME32_1 + PRIME32_2;
-+		uint32_t v2 = seed + PRIME32_2;
-+		uint32_t v3 = seed + 0;
-+		uint32_t v4 = seed - PRIME32_1;
-+
-+		do {
-+			v1 = xxh32_round(v1, get_unaligned_le32(p));
-+			p += 4;
-+			v2 = xxh32_round(v2, get_unaligned_le32(p));
-+			p += 4;
-+			v3 = xxh32_round(v3, get_unaligned_le32(p));
-+			p += 4;
-+			v4 = xxh32_round(v4, get_unaligned_le32(p));
-+			p += 4;
-+		} while (p <= limit);
-+
-+		h32 = xxh_rotl32(v1, 1) + xxh_rotl32(v2, 7) +
-+			xxh_rotl32(v3, 12) + xxh_rotl32(v4, 18);
-+	} else {
-+		h32 = seed + PRIME32_5;
-+	}
-+
-+	h32 += (uint32_t)len;
-+
-+	while (p + 4 <= b_end) {
-+		h32 += get_unaligned_le32(p) * PRIME32_3;
-+		h32 = xxh_rotl32(h32, 17) * PRIME32_4;
-+		p += 4;
-+	}
-+
-+	while (p < b_end) {
-+		h32 += (*p) * PRIME32_5;
-+		h32 = xxh_rotl32(h32, 11) * PRIME32_1;
-+		p++;
-+	}
-+
-+	h32 ^= h32 >> 15;
-+	h32 *= PRIME32_2;
-+	h32 ^= h32 >> 13;
-+	h32 *= PRIME32_3;
-+	h32 ^= h32 >> 16;
-+
-+	return h32;
-+}
-+EXPORT_SYMBOL(xxh32);
-+
-+static uint64_t xxh64_round(uint64_t acc, const uint64_t input)
-+{
-+	acc += input * PRIME64_2;
-+	acc = xxh_rotl64(acc, 31);
-+	acc *= PRIME64_1;
-+	return acc;
-+}
-+
-+static uint64_t xxh64_merge_round(uint64_t acc, uint64_t val)
-+{
-+	val = xxh64_round(0, val);
-+	acc ^= val;
-+	acc = acc * PRIME64_1 + PRIME64_4;
-+	return acc;
-+}
-+
-+uint64_t xxh64(const void *input, const size_t len, const uint64_t seed)
-+{
-+	const uint8_t *p = (const uint8_t *)input;
-+	const uint8_t *const b_end = p + len;
-+	uint64_t h64;
-+
-+	if (len >= 32) {
-+		const uint8_t *const limit = b_end - 32;
-+		uint64_t v1 = seed + PRIME64_1 + PRIME64_2;
-+		uint64_t v2 = seed + PRIME64_2;
-+		uint64_t v3 = seed + 0;
-+		uint64_t v4 = seed - PRIME64_1;
-+
-+		do {
-+			v1 = xxh64_round(v1, get_unaligned_le64(p));
-+			p += 8;
-+			v2 = xxh64_round(v2, get_unaligned_le64(p));
-+			p += 8;
-+			v3 = xxh64_round(v3, get_unaligned_le64(p));
-+			p += 8;
-+			v4 = xxh64_round(v4, get_unaligned_le64(p));
-+			p += 8;
-+		} while (p <= limit);
-+
-+		h64 = xxh_rotl64(v1, 1) + xxh_rotl64(v2, 7) +
-+			xxh_rotl64(v3, 12) + xxh_rotl64(v4, 18);
-+		h64 = xxh64_merge_round(h64, v1);
-+		h64 = xxh64_merge_round(h64, v2);
-+		h64 = xxh64_merge_round(h64, v3);
-+		h64 = xxh64_merge_round(h64, v4);
-+
-+	} else {
-+		h64  = seed + PRIME64_5;
-+	}
-+
-+	h64 += (uint64_t)len;
-+
-+	while (p + 8 <= b_end) {
-+		const uint64_t k1 = xxh64_round(0, get_unaligned_le64(p));
-+
-+		h64 ^= k1;
-+		h64 = xxh_rotl64(h64, 27) * PRIME64_1 + PRIME64_4;
-+		p += 8;
-+	}
-+
-+	if (p + 4 <= b_end) {
-+		h64 ^= (uint64_t)(get_unaligned_le32(p)) * PRIME64_1;
-+		h64 = xxh_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
-+		p += 4;
-+	}
-+
-+	while (p < b_end) {
-+		h64 ^= (*p) * PRIME64_5;
-+		h64 = xxh_rotl64(h64, 11) * PRIME64_1;
-+		p++;
-+	}
-+
-+	h64 ^= h64 >> 33;
-+	h64 *= PRIME64_2;
-+	h64 ^= h64 >> 29;
-+	h64 *= PRIME64_3;
-+	h64 ^= h64 >> 32;
-+
-+	return h64;
-+}
-+EXPORT_SYMBOL(xxh64);
-+
-+/*-**************************************************
-+ * Advanced Hash Functions
-+ ***************************************************/
-+void xxh32_reset(struct xxh32_state *statePtr, const uint32_t seed)
-+{
-+	/* use a local state for memcpy() to avoid strict-aliasing warnings */
-+	struct xxh32_state state;
-+
-+	memset(&state, 0, sizeof(state));
-+	state.v1 = seed + PRIME32_1 + PRIME32_2;
-+	state.v2 = seed + PRIME32_2;
-+	state.v3 = seed + 0;
-+	state.v4 = seed - PRIME32_1;
-+	memcpy(statePtr, &state, sizeof(state));
-+}
-+EXPORT_SYMBOL(xxh32_reset);
-+
-+void xxh64_reset(struct xxh64_state *statePtr, const uint64_t seed)
-+{
-+	/* use a local state for memcpy() to avoid strict-aliasing warnings */
-+	struct xxh64_state state;
-+
-+	memset(&state, 0, sizeof(state));
-+	state.v1 = seed + PRIME64_1 + PRIME64_2;
-+	state.v2 = seed + PRIME64_2;
-+	state.v3 = seed + 0;
-+	state.v4 = seed - PRIME64_1;
-+	memcpy(statePtr, &state, sizeof(state));
-+}
-+EXPORT_SYMBOL(xxh64_reset);
-+
-+int xxh32_update(struct xxh32_state *state, const void *input, const size_t len)
-+{
-+	const uint8_t *p = (const uint8_t *)input;
-+	const uint8_t *const b_end = p + len;
-+
-+	if (input == NULL)
-+		return -EINVAL;
-+
-+	state->total_len_32 += (uint32_t)len;
-+	state->large_len |= (len >= 16) | (state->total_len_32 >= 16);
-+
-+	if (state->memsize + len < 16) { /* fill in tmp buffer */
-+		memcpy((uint8_t *)(state->mem32) + state->memsize, input, len);
-+		state->memsize += (uint32_t)len;
-+		return 0;
-+	}
-+
-+	if (state->memsize) { /* some data left from previous update */
-+		const uint32_t *p32 = state->mem32;
-+
-+		memcpy((uint8_t *)(state->mem32) + state->memsize, input,
-+			16 - state->memsize);
-+
-+		state->v1 = xxh32_round(state->v1, get_unaligned_le32(p32));
-+		p32++;
-+		state->v2 = xxh32_round(state->v2, get_unaligned_le32(p32));
-+		p32++;
-+		state->v3 = xxh32_round(state->v3, get_unaligned_le32(p32));
-+		p32++;
-+		state->v4 = xxh32_round(state->v4, get_unaligned_le32(p32));
-+		p32++;
-+
-+		p += 16-state->memsize;
-+		state->memsize = 0;
-+	}
-+
-+	if (p <= b_end - 16) {
-+		const uint8_t *const limit = b_end - 16;
-+		uint32_t v1 = state->v1;
-+		uint32_t v2 = state->v2;
-+		uint32_t v3 = state->v3;
-+		uint32_t v4 = state->v4;
-+
-+		do {
-+			v1 = xxh32_round(v1, get_unaligned_le32(p));
-+			p += 4;
-+			v2 = xxh32_round(v2, get_unaligned_le32(p));
-+			p += 4;
-+			v3 = xxh32_round(v3, get_unaligned_le32(p));
-+			p += 4;
-+			v4 = xxh32_round(v4, get_unaligned_le32(p));
-+			p += 4;
-+		} while (p <= limit);
-+
-+		state->v1 = v1;
-+		state->v2 = v2;
-+		state->v3 = v3;
-+		state->v4 = v4;
-+	}
-+
-+	if (p < b_end) {
-+		memcpy(state->mem32, p, (size_t)(b_end-p));
-+		state->memsize = (uint32_t)(b_end-p);
-+	}
-+
-+	return 0;
-+}
-+EXPORT_SYMBOL(xxh32_update);
-+
-+uint32_t xxh32_digest(const struct xxh32_state *state)
-+{
-+	const uint8_t *p = (const uint8_t *)state->mem32;
-+	const uint8_t *const b_end = (const uint8_t *)(state->mem32) +
-+		state->memsize;
-+	uint32_t h32;
-+
-+	if (state->large_len) {
-+		h32 = xxh_rotl32(state->v1, 1) + xxh_rotl32(state->v2, 7) +
-+			xxh_rotl32(state->v3, 12) + xxh_rotl32(state->v4, 18);
-+	} else {
-+		h32 = state->v3 /* == seed */ + PRIME32_5;
-+	}
-+
-+	h32 += state->total_len_32;
-+
-+	while (p + 4 <= b_end) {
-+		h32 += get_unaligned_le32(p) * PRIME32_3;
-+		h32 = xxh_rotl32(h32, 17) * PRIME32_4;
-+		p += 4;
-+	}
-+
-+	while (p < b_end) {
-+		h32 += (*p) * PRIME32_5;
-+		h32 = xxh_rotl32(h32, 11) * PRIME32_1;
-+		p++;
-+	}
-+
-+	h32 ^= h32 >> 15;
-+	h32 *= PRIME32_2;
-+	h32 ^= h32 >> 13;
-+	h32 *= PRIME32_3;
-+	h32 ^= h32 >> 16;
-+
-+	return h32;
-+}
-+EXPORT_SYMBOL(xxh32_digest);
-+
-+int xxh64_update(struct xxh64_state *state, const void *input, const size_t len)
-+{
-+	const uint8_t *p = (const uint8_t *)input;
-+	const uint8_t *const b_end = p + len;
-+
-+	if (input == NULL)
-+		return -EINVAL;
-+
-+	state->total_len += len;
-+
-+	if (state->memsize + len < 32) { /* fill in tmp buffer */
-+		memcpy(((uint8_t *)state->mem64) + state->memsize, input, len);
-+		state->memsize += (uint32_t)len;
-+		return 0;
-+	}
-+
-+	if (state->memsize) { /* tmp buffer is full */
-+		uint64_t *p64 = state->mem64;
-+
-+		memcpy(((uint8_t *)p64) + state->memsize, input,
-+			32 - state->memsize);
-+
-+		state->v1 = xxh64_round(state->v1, get_unaligned_le64(p64));
-+		p64++;
-+		state->v2 = xxh64_round(state->v2, get_unaligned_le64(p64));
-+		p64++;
-+		state->v3 = xxh64_round(state->v3, get_unaligned_le64(p64));
-+		p64++;
-+		state->v4 = xxh64_round(state->v4, get_unaligned_le64(p64));
-+
-+		p += 32 - state->memsize;
-+		state->memsize = 0;
-+	}
-+
-+	if (p + 32 <= b_end) {
-+		const uint8_t *const limit = b_end - 32;
-+		uint64_t v1 = state->v1;
-+		uint64_t v2 = state->v2;
-+		uint64_t v3 = state->v3;
-+		uint64_t v4 = state->v4;
-+
-+		do {
-+			v1 = xxh64_round(v1, get_unaligned_le64(p));
-+			p += 8;
-+			v2 = xxh64_round(v2, get_unaligned_le64(p));
-+			p += 8;
-+			v3 = xxh64_round(v3, get_unaligned_le64(p));
-+			p += 8;
-+			v4 = xxh64_round(v4, get_unaligned_le64(p));
-+			p += 8;
-+		} while (p <= limit);
-+
-+		state->v1 = v1;
-+		state->v2 = v2;
-+		state->v3 = v3;
-+		state->v4 = v4;
-+	}
-+
-+	if (p < b_end) {
-+		memcpy(state->mem64, p, (size_t)(b_end-p));
-+		state->memsize = (uint32_t)(b_end - p);
-+	}
-+
-+	return 0;
-+}
-+EXPORT_SYMBOL(xxh64_update);
-+
-+uint64_t xxh64_digest(const struct xxh64_state *state)
-+{
-+	const uint8_t *p = (const uint8_t *)state->mem64;
-+	const uint8_t *const b_end = (const uint8_t *)state->mem64 +
-+		state->memsize;
-+	uint64_t h64;
-+
-+	if (state->total_len >= 32) {
-+		const uint64_t v1 = state->v1;
-+		const uint64_t v2 = state->v2;
-+		const uint64_t v3 = state->v3;
-+		const uint64_t v4 = state->v4;
-+
-+		h64 = xxh_rotl64(v1, 1) + xxh_rotl64(v2, 7) +
-+			xxh_rotl64(v3, 12) + xxh_rotl64(v4, 18);
-+		h64 = xxh64_merge_round(h64, v1);
-+		h64 = xxh64_merge_round(h64, v2);
-+		h64 = xxh64_merge_round(h64, v3);
-+		h64 = xxh64_merge_round(h64, v4);
-+	} else {
-+		h64  = state->v3 + PRIME64_5;
-+	}
-+
-+	h64 += (uint64_t)state->total_len;
-+
-+	while (p + 8 <= b_end) {
-+		const uint64_t k1 = xxh64_round(0, get_unaligned_le64(p));
-+
-+		h64 ^= k1;
-+		h64 = xxh_rotl64(h64, 27) * PRIME64_1 + PRIME64_4;
-+		p += 8;
-+	}
-+
-+	if (p + 4 <= b_end) {
-+		h64 ^= (uint64_t)(get_unaligned_le32(p)) * PRIME64_1;
-+		h64 = xxh_rotl64(h64, 23) * PRIME64_2 + PRIME64_3;
-+		p += 4;
-+	}
-+
-+	while (p < b_end) {
-+		h64 ^= (*p) * PRIME64_5;
-+		h64 = xxh_rotl64(h64, 11) * PRIME64_1;
-+		p++;
-+	}
-+
-+	h64 ^= h64 >> 33;
-+	h64 *= PRIME64_2;
-+	h64 ^= h64 >> 29;
-+	h64 *= PRIME64_3;
-+	h64 ^= h64 >> 32;
-+
-+	return h64;
-+}
-+EXPORT_SYMBOL(xxh64_digest);
-+
-+MODULE_LICENSE("Dual BSD/GPL");
-+MODULE_DESCRIPTION("xxHash");
--
-2.9.3
@@ -1,740 +0,0 @@
-From 8a9dddfbf6551afea73911e367dd4be64d62b9fd Mon Sep 17 00:00:00 2001
-From: Nick Terrell <terrelln@fb.com>
-Date: Mon, 17 Jul 2017 17:08:39 -0700
-Subject: [PATCH v5 3/5] btrfs: Add zstd support
-
-Add zstd compression and decompression support to BtrFS. zstd at its
-fastest level compresses almost as well as zlib, while offering much
-faster compression and decompression, approaching lzo speeds.
-
-I benchmarked btrfs with zstd compression against no compression, lzo
-compression, and zlib compression. I benchmarked two scenarios. Copying
-a set of files to btrfs, and then reading the files. Copying a tarball
-to btrfs, extracting it to btrfs, and then reading the extracted files.
-After every operation, I call `sync` and include the sync time.
-Between every pair of operations I unmount and remount the filesystem
-to avoid caching. The benchmark files can be found in the upstream
-zstd source repository under
-`contrib/linux-kernel/{btrfs-benchmark.sh,btrfs-extract-benchmark.sh}`
-[1] [2].
-
-I ran the benchmarks on a Ubuntu 14.04 VM with 2 cores and 4 GiB of RAM.
-The VM is running on a MacBook Pro with a 3.1 GHz Intel Core i7 processor,
-16 GB of RAM, and a SSD.
-
-The first compression benchmark is copying 10 copies of the unzipped
-Silesia corpus [3] into a BtrFS filesystem mounted with
-`-o compress-force=Method`. The decompression benchmark times how long
-it takes to `tar` all 10 copies into `/dev/null`. The compression ratio is
-measured by comparing the output of `df` and `du`. See the benchmark file
-[1] for details. I benchmarked multiple zstd compression levels, although
-the patch uses zstd level 1.
-
-| Method  | Ratio | Compression MB/s | Decompression speed |
-|---------|-------|------------------|---------------------|
-| None    |  0.99 |              504 |                 686 |
-| lzo     |  1.66 |              398 |                 442 |
-| zlib    |  2.58 |               65 |                 241 |
-| zstd 1  |  2.57 |              260 |                 383 |
-| zstd 3  |  2.71 |              174 |                 408 |
-| zstd 6  |  2.87 |               70 |                 398 |
-| zstd 9  |  2.92 |               43 |                 406 |
-| zstd 12 |  2.93 |               21 |                 408 |
-| zstd 15 |  3.01 |               11 |                 354 |
-
-The next benchmark first copies `linux-4.11.6.tar` [4] to btrfs. Then it
-measures the compression ratio, extracts the tar, and deletes the tar.
-Then it measures the compression ratio again, and `tar`s the extracted
-files into `/dev/null`. See the benchmark file [2] for details.
-
-| Method | Tar Ratio | Extract Ratio | Copy (s) | Extract (s)| Read (s) |
-|--------|-----------|---------------|----------|------------|----------|
-| None   |      0.97 |          0.78 |    0.981 |      5.501 |    8.807 |
-| lzo    |      2.06 |          1.38 |    1.631 |      8.458 |    8.585 |
-| zlib   |      3.40 |          1.86 |    7.750 |     21.544 |   11.744 |
-| zstd 1 |      3.57 |          1.85 |    2.579 |     11.479 |    9.389 |
-
-[1] https://github.com/facebook/zstd/blob/dev/contrib/linux-kernel/btrfs-benchmark.sh
-[2] https://github.com/facebook/zstd/blob/dev/contrib/linux-kernel/btrfs-extract-benchmark.sh
-[3] http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia
-[4] https://cdn.kernel.org/pub/linux/kernel/v4.x/linux-4.11.6.tar.xz
-
-zstd source repository: https://github.com/facebook/zstd
-
-Signed-off-by: Nick Terrell <terrelln@fb.com>
---
-v2 -> v3:
- Port upstream BtrFS commits e1ddce71d6, 389a6cfc2a, and 6acafd1eff
- Change default compression level for BtrFS to 3
-
-v3 -> v4:
- Add missing includes, which fixes the aarch64 build
- Fix minor linter warnings
-
- fs/btrfs/Kconfig           |   2 +
- fs/btrfs/Makefile          |   2 +-
- fs/btrfs/compression.c     |   1 +
- fs/btrfs/compression.h     |   6 +-
- fs/btrfs/ctree.h           |   1 +
- fs/btrfs/disk-io.c         |   2 +
- fs/btrfs/ioctl.c           |   6 +-
- fs/btrfs/props.c           |   6 +
- fs/btrfs/super.c           |  12 +-
- fs/btrfs/sysfs.c           |   2 +
- fs/btrfs/zstd.c            | 432 +++++++++++++++++++++++++++++++++++++++++++++
- include/uapi/linux/btrfs.h |   8 +-
- 12 files changed, 468 insertions(+), 12 deletions(-)
- create mode 100644 fs/btrfs/zstd.c
-
-diff --git a/fs/btrfs/Kconfig b/fs/btrfs/Kconfig
-index 80e9c18..a26c63b 100644
--- a/fs/btrfs/Kconfig
-+++ b/fs/btrfs/Kconfig
-@@ -6,6 +6,8 @@ config BTRFS_FS
- 	select ZLIB_DEFLATE
- 	select LZO_COMPRESS
- 	select LZO_DECOMPRESS
-+	select ZSTD_COMPRESS
-+	select ZSTD_DECOMPRESS
- 	select RAID6_PQ
- 	select XOR_BLOCKS
- 	select SRCU
-diff --git a/fs/btrfs/Makefile b/fs/btrfs/Makefile
-index 128ce17..962a95a 100644
--- a/fs/btrfs/Makefile
-+++ b/fs/btrfs/Makefile
-@@ -6,7 +6,7 @@ btrfs-y += super.o ctree.o extent-tree.o print-tree.o root-tree.o dir-item.o \
- 	   transaction.o inode.o file.o tree-defrag.o \
- 	   extent_map.o sysfs.o struct-funcs.o xattr.o ordered-data.o \
- 	   extent_io.o volumes.o async-thread.o ioctl.o locking.o orphan.o \
-	   export.o tree-log.o free-space-cache.o zlib.o lzo.o \
-+	   export.o tree-log.o free-space-cache.o zlib.o lzo.o zstd.o \
- 	   compression.o delayed-ref.o relocation.o delayed-inode.o scrub.o \
- 	   reada.o backref.o ulist.o qgroup.o send.o dev-replace.o raid56.o \
- 	   uuid-tree.o props.o hash.o free-space-tree.o
-diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
-index d2ef9ac..4ff42d1 100644
--- a/fs/btrfs/compression.c
-+++ b/fs/btrfs/compression.c
-@@ -704,6 +704,7 @@ static struct {
- static const struct btrfs_compress_op * const btrfs_compress_op[] = {
- 	&btrfs_zlib_compress,
- 	&btrfs_lzo_compress,
-+	&btrfs_zstd_compress,
- };
-
- void __init btrfs_init_compress(void)
-diff --git a/fs/btrfs/compression.h b/fs/btrfs/compression.h
-index 87f6d33..2269e00 100644
--- a/fs/btrfs/compression.h
-+++ b/fs/btrfs/compression.h
-@@ -99,8 +99,9 @@ enum btrfs_compression_type {
- 	BTRFS_COMPRESS_NONE  = 0,
- 	BTRFS_COMPRESS_ZLIB  = 1,
- 	BTRFS_COMPRESS_LZO   = 2,
-	BTRFS_COMPRESS_TYPES = 2,
-	BTRFS_COMPRESS_LAST  = 3,
-+	BTRFS_COMPRESS_ZSTD  = 3,
-+	BTRFS_COMPRESS_TYPES = 3,
-+	BTRFS_COMPRESS_LAST  = 4,
- };
-
- struct btrfs_compress_op {
-@@ -128,5 +129,6 @@ struct btrfs_compress_op {
-
- extern const struct btrfs_compress_op btrfs_zlib_compress;
- extern const struct btrfs_compress_op btrfs_lzo_compress;
-+extern const struct btrfs_compress_op btrfs_zstd_compress;
-
- #endif
-diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
-index 3f3eb7b..845d77c 100644
--- a/fs/btrfs/ctree.h
-+++ b/fs/btrfs/ctree.h
-@@ -270,6 +270,7 @@ struct btrfs_super_block {
- 	 BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS |		\
- 	 BTRFS_FEATURE_INCOMPAT_BIG_METADATA |		\
- 	 BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO |		\
-+	 BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD |		\
- 	 BTRFS_FEATURE_INCOMPAT_RAID56 |		\
- 	 BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |		\
- 	 BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |	\
-diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
-index 080e2eb..04632f4 100644
--- a/fs/btrfs/disk-io.c
-+++ b/fs/btrfs/disk-io.c
-@@ -2828,6 +2828,8 @@ int open_ctree(struct super_block *sb,
- 	features |= BTRFS_FEATURE_INCOMPAT_MIXED_BACKREF;
- 	if (fs_info->compress_type == BTRFS_COMPRESS_LZO)
- 		features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO;
-+	else if (fs_info->compress_type == BTRFS_COMPRESS_ZSTD)
-+		features |= BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD;
-
- 	if (features & BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA)
- 		btrfs_info(fs_info, "has skinny extents");
-diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
-index fa1b78c..b9963d9 100644
--- a/fs/btrfs/ioctl.c
-+++ b/fs/btrfs/ioctl.c
-@@ -327,8 +327,10 @@ static int btrfs_ioctl_setflags(struct file *file, void __user *arg)
-
- 		if (fs_info->compress_type == BTRFS_COMPRESS_LZO)
- 			comp = "lzo";
-		else
-+		else if (fs_info->compress_type == BTRFS_COMPRESS_ZLIB)
- 			comp = "zlib";
-+		else
-+			comp = "zstd";
- 		ret = btrfs_set_prop(inode, "btrfs.compression",
- 				     comp, strlen(comp), 0);
- 		if (ret)
-@@ -1466,6 +1468,8 @@ int btrfs_defrag_file(struct inode *inode, struct file *file,
-
- 	if (range->compress_type == BTRFS_COMPRESS_LZO) {
- 		btrfs_set_fs_incompat(fs_info, COMPRESS_LZO);
-+	} else if (range->compress_type == BTRFS_COMPRESS_ZSTD) {
-+		btrfs_set_fs_incompat(fs_info, COMPRESS_ZSTD);
- 	}
-
- 	ret = defrag_count;
-diff --git a/fs/btrfs/props.c b/fs/btrfs/props.c
-index 4b23ae5..20631e9 100644
--- a/fs/btrfs/props.c
-+++ b/fs/btrfs/props.c
-@@ -390,6 +390,8 @@ static int prop_compression_validate(const char *value, size_t len)
- 		return 0;
- 	else if (!strncmp("zlib", value, len))
- 		return 0;
-+	else if (!strncmp("zstd", value, len))
-+		return 0;
-
- 	return -EINVAL;
- }
-@@ -412,6 +414,8 @@ static int prop_compression_apply(struct inode *inode,
- 		type = BTRFS_COMPRESS_LZO;
- 	else if (!strncmp("zlib", value, len))
- 		type = BTRFS_COMPRESS_ZLIB;
-+	else if (!strncmp("zstd", value, len))
-+		type = BTRFS_COMPRESS_ZSTD;
- 	else
- 		return -EINVAL;
-
-@@ -429,6 +433,8 @@ static const char *prop_compression_extract(struct inode *inode)
- 		return "zlib";
- 	case BTRFS_COMPRESS_LZO:
- 		return "lzo";
-+	case BTRFS_COMPRESS_ZSTD:
-+		return "zstd";
- 	}
-
- 	return NULL;
-diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
-index 12540b6..c370dea 100644
--- a/fs/btrfs/super.c
-+++ b/fs/btrfs/super.c
-@@ -513,6 +513,14 @@ int btrfs_parse_options(struct btrfs_fs_info *info, char *options,
- 				btrfs_clear_opt(info->mount_opt, NODATASUM);
- 				btrfs_set_fs_incompat(info, COMPRESS_LZO);
- 				no_compress = 0;
-+			} else if (strcmp(args[0].from, "zstd") == 0) {
-+				compress_type = "zstd";
-+				info->compress_type = BTRFS_COMPRESS_ZSTD;
-+				btrfs_set_opt(info->mount_opt, COMPRESS);
-+				btrfs_clear_opt(info->mount_opt, NODATACOW);
-+				btrfs_clear_opt(info->mount_opt, NODATASUM);
-+				btrfs_set_fs_incompat(info, COMPRESS_ZSTD);
-+				no_compress = 0;
- 			} else if (strncmp(args[0].from, "no", 2) == 0) {
- 				compress_type = "no";
- 				btrfs_clear_opt(info->mount_opt, COMPRESS);
-@@ -1227,8 +1235,10 @@ static int btrfs_show_options(struct seq_file *seq, struct dentry *dentry)
- 	if (btrfs_test_opt(info, COMPRESS)) {
- 		if (info->compress_type == BTRFS_COMPRESS_ZLIB)
- 			compress_type = "zlib";
-		else
-+		else if (info->compress_type == BTRFS_COMPRESS_LZO)
- 			compress_type = "lzo";
-+		else
-+			compress_type = "zstd";
- 		if (btrfs_test_opt(info, FORCE_COMPRESS))
- 			seq_printf(seq, ",compress-force=%s", compress_type);
- 		else
-diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
-index c2d5f35..2b6d37c 100644
--- a/fs/btrfs/sysfs.c
-+++ b/fs/btrfs/sysfs.c
-@@ -200,6 +200,7 @@ BTRFS_FEAT_ATTR_INCOMPAT(mixed_backref, MIXED_BACKREF);
- BTRFS_FEAT_ATTR_INCOMPAT(default_subvol, DEFAULT_SUBVOL);
- BTRFS_FEAT_ATTR_INCOMPAT(mixed_groups, MIXED_GROUPS);
- BTRFS_FEAT_ATTR_INCOMPAT(compress_lzo, COMPRESS_LZO);
-+BTRFS_FEAT_ATTR_INCOMPAT(compress_zstd, COMPRESS_ZSTD);
- BTRFS_FEAT_ATTR_INCOMPAT(big_metadata, BIG_METADATA);
- BTRFS_FEAT_ATTR_INCOMPAT(extended_iref, EXTENDED_IREF);
- BTRFS_FEAT_ATTR_INCOMPAT(raid56, RAID56);
-@@ -212,6 +213,7 @@ static struct attribute *btrfs_supported_feature_attrs[] = {
- 	BTRFS_FEAT_ATTR_PTR(default_subvol),
- 	BTRFS_FEAT_ATTR_PTR(mixed_groups),
- 	BTRFS_FEAT_ATTR_PTR(compress_lzo),
-+	BTRFS_FEAT_ATTR_PTR(compress_zstd),
- 	BTRFS_FEAT_ATTR_PTR(big_metadata),
- 	BTRFS_FEAT_ATTR_PTR(extended_iref),
- 	BTRFS_FEAT_ATTR_PTR(raid56),
-diff --git a/fs/btrfs/zstd.c b/fs/btrfs/zstd.c
-new file mode 100644
-index 0000000..607ce47
--- /dev/null
-+++ b/fs/btrfs/zstd.c
-@@ -0,0 +1,432 @@
-+/*
-+ * Copyright (c) 2016-present, Facebook, Inc.
-+ * All rights reserved.
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public
-+ * License v2 as published by the Free Software Foundation.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
-+ * General Public License for more details.
-+ */
-+#include <linux/bio.h>
-+#include <linux/err.h>
-+#include <linux/init.h>
-+#include <linux/kernel.h>
-+#include <linux/mm.h>
-+#include <linux/pagemap.h>
-+#include <linux/refcount.h>
-+#include <linux/sched.h>
-+#include <linux/slab.h>
-+#include <linux/zstd.h>
-+#include "compression.h"
-+
-+#define ZSTD_BTRFS_MAX_WINDOWLOG 17
-+#define ZSTD_BTRFS_MAX_INPUT (1 << ZSTD_BTRFS_MAX_WINDOWLOG)
-+#define ZSTD_BTRFS_DEFAULT_LEVEL 3
-+
-+static ZSTD_parameters zstd_get_btrfs_parameters(size_t src_len)
-+{
-+	ZSTD_parameters params = ZSTD_getParams(ZSTD_BTRFS_DEFAULT_LEVEL,
-+						src_len, 0);
-+
-+	if (params.cParams.windowLog > ZSTD_BTRFS_MAX_WINDOWLOG)
-+		params.cParams.windowLog = ZSTD_BTRFS_MAX_WINDOWLOG;
-+	WARN_ON(src_len > ZSTD_BTRFS_MAX_INPUT);
-+	return params;
-+}
-+
-+struct workspace {
-+	void *mem;
-+	size_t size;
-+	char *buf;
-+	struct list_head list;
-+};
-+
-+static void zstd_free_workspace(struct list_head *ws)
-+{
-+	struct workspace *workspace = list_entry(ws, struct workspace, list);
-+
-+	kvfree(workspace->mem);
-+	kfree(workspace->buf);
-+	kfree(workspace);
-+}
-+
-+static struct list_head *zstd_alloc_workspace(void)
-+{
-+	ZSTD_parameters params =
-+			zstd_get_btrfs_parameters(ZSTD_BTRFS_MAX_INPUT);
-+	struct workspace *workspace;
-+
-+	workspace = kzalloc(sizeof(*workspace), GFP_KERNEL);
-+	if (!workspace)
-+		return ERR_PTR(-ENOMEM);
-+
-+	workspace->size = max_t(size_t,
-+			ZSTD_CStreamWorkspaceBound(params.cParams),
-+			ZSTD_DStreamWorkspaceBound(ZSTD_BTRFS_MAX_INPUT));
-+	workspace->mem = kvmalloc(workspace->size, GFP_KERNEL);
-+	workspace->buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
-+	if (!workspace->mem || !workspace->buf)
-+		goto fail;
-+
-+	INIT_LIST_HEAD(&workspace->list);
-+
-+	return &workspace->list;
-+fail:
-+	zstd_free_workspace(&workspace->list);
-+	return ERR_PTR(-ENOMEM);
-+}
-+
-+static int zstd_compress_pages(struct list_head *ws,
-+		struct address_space *mapping,
-+		u64 start,
-+		struct page **pages,
-+		unsigned long *out_pages,
-+		unsigned long *total_in,
-+		unsigned long *total_out)
-+{
-+	struct workspace *workspace = list_entry(ws, struct workspace, list);
-+	ZSTD_CStream *stream;
-+	int ret = 0;
-+	int nr_pages = 0;
-+	struct page *in_page = NULL;  /* The current page to read */
-+	struct page *out_page = NULL; /* The current page to write to */
-+	ZSTD_inBuffer in_buf = { NULL, 0, 0 };
-+	ZSTD_outBuffer out_buf = { NULL, 0, 0 };
-+	unsigned long tot_in = 0;
-+	unsigned long tot_out = 0;
-+	unsigned long len = *total_out;
-+	const unsigned long nr_dest_pages = *out_pages;
-+	unsigned long max_out = nr_dest_pages * PAGE_SIZE;
-+	ZSTD_parameters params = zstd_get_btrfs_parameters(len);
-+
-+	*out_pages = 0;
-+	*total_out = 0;
-+	*total_in = 0;
-+
-+	/* Initialize the stream */
-+	stream = ZSTD_initCStream(params, len, workspace->mem,
-+			workspace->size);
-+	if (!stream) {
-+		pr_warn("BTRFS: ZSTD_initCStream failed\n");
-+		ret = -EIO;
-+		goto out;
-+	}
-+
-+	/* map in the first page of input data */
-+	in_page = find_get_page(mapping, start >> PAGE_SHIFT);
-+	in_buf.src = kmap(in_page);
-+	in_buf.pos = 0;
-+	in_buf.size = min_t(size_t, len, PAGE_SIZE);
-+
-+
-+	/* Allocate and map in the output buffer */
-+	out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
-+	if (out_page == NULL) {
-+		ret = -ENOMEM;
-+		goto out;
-+	}
-+	pages[nr_pages++] = out_page;
-+	out_buf.dst = kmap(out_page);
-+	out_buf.pos = 0;
-+	out_buf.size = min_t(size_t, max_out, PAGE_SIZE);
-+
-+	while (1) {
-+		size_t ret2;
-+
-+		ret2 = ZSTD_compressStream(stream, &out_buf, &in_buf);
-+		if (ZSTD_isError(ret2)) {
-+			pr_debug("BTRFS: ZSTD_compressStream returned %d\n",
-+					ZSTD_getErrorCode(ret2));
-+			ret = -EIO;
-+			goto out;
-+		}
-+
-+		/* Check to see if we are making it bigger */
-+		if (tot_in + in_buf.pos > 8192 &&
-+				tot_in + in_buf.pos <
-+				tot_out + out_buf.pos) {
-+			ret = -E2BIG;
-+			goto out;
-+		}
-+
-+		/* We've reached the end of our output range */
-+		if (out_buf.pos >= max_out) {
-+			tot_out += out_buf.pos;
-+			ret = -E2BIG;
-+			goto out;
-+		}
-+
-+		/* Check if we need more output space */
-+		if (out_buf.pos == out_buf.size) {
-+			tot_out += PAGE_SIZE;
-+			max_out -= PAGE_SIZE;
-+			kunmap(out_page);
-+			if (nr_pages == nr_dest_pages) {
-+				out_page = NULL;
-+				ret = -E2BIG;
-+				goto out;
-+			}
-+			out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
-+			if (out_page == NULL) {
-+				ret = -ENOMEM;
-+				goto out;
-+			}
-+			pages[nr_pages++] = out_page;
-+			out_buf.dst = kmap(out_page);
-+			out_buf.pos = 0;
-+			out_buf.size = min_t(size_t, max_out, PAGE_SIZE);
-+		}
-+
-+		/* We've reached the end of the input */
-+		if (in_buf.pos >= len) {
-+			tot_in += in_buf.pos;
-+			break;
-+		}
-+
-+		/* Check if we need more input */
-+		if (in_buf.pos == in_buf.size) {
-+			tot_in += PAGE_SIZE;
-+			kunmap(in_page);
-+			put_page(in_page);
-+
-+			start += PAGE_SIZE;
-+			len -= PAGE_SIZE;
-+			in_page = find_get_page(mapping, start >> PAGE_SHIFT);
-+			in_buf.src = kmap(in_page);
-+			in_buf.pos = 0;
-+			in_buf.size = min_t(size_t, len, PAGE_SIZE);
-+		}
-+	}
-+	while (1) {
-+		size_t ret2;
-+
-+		ret2 = ZSTD_endStream(stream, &out_buf);
-+		if (ZSTD_isError(ret2)) {
-+			pr_debug("BTRFS: ZSTD_endStream returned %d\n",
-+					ZSTD_getErrorCode(ret2));
-+			ret = -EIO;
-+			goto out;
-+		}
-+		if (ret2 == 0) {
-+			tot_out += out_buf.pos;
-+			break;
-+		}
-+		if (out_buf.pos >= max_out) {
-+			tot_out += out_buf.pos;
-+			ret = -E2BIG;
-+			goto out;
-+		}
-+
-+		tot_out += PAGE_SIZE;
-+		max_out -= PAGE_SIZE;
-+		kunmap(out_page);
-+		if (nr_pages == nr_dest_pages) {
-+			out_page = NULL;
-+			ret = -E2BIG;
-+			goto out;
-+		}
-+		out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
-+		if (out_page == NULL) {
-+			ret = -ENOMEM;
-+			goto out;
-+		}
-+		pages[nr_pages++] = out_page;
-+		out_buf.dst = kmap(out_page);
-+		out_buf.pos = 0;
-+		out_buf.size = min_t(size_t, max_out, PAGE_SIZE);
-+	}
-+
-+	if (tot_out >= tot_in) {
-+		ret = -E2BIG;
-+		goto out;
-+	}
-+
-+	ret = 0;
-+	*total_in = tot_in;
-+	*total_out = tot_out;
-+out:
-+	*out_pages = nr_pages;
-+	/* Cleanup */
-+	if (in_page) {
-+		kunmap(in_page);
-+		put_page(in_page);
-+	}
-+	if (out_page)
-+		kunmap(out_page);
-+	return ret;
-+}
-+
-+static int zstd_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
-+{
-+	struct workspace *workspace = list_entry(ws, struct workspace, list);
-+	struct page **pages_in = cb->compressed_pages;
-+	u64 disk_start = cb->start;
-+	struct bio *orig_bio = cb->orig_bio;
-+	size_t srclen = cb->compressed_len;
-+	ZSTD_DStream *stream;
-+	int ret = 0;
-+	unsigned long page_in_index = 0;
-+	unsigned long total_pages_in = DIV_ROUND_UP(srclen, PAGE_SIZE);
-+	unsigned long buf_start;
-+	unsigned long total_out = 0;
-+	ZSTD_inBuffer in_buf = { NULL, 0, 0 };
-+	ZSTD_outBuffer out_buf = { NULL, 0, 0 };
-+
-+	stream = ZSTD_initDStream(
-+			ZSTD_BTRFS_MAX_INPUT, workspace->mem, workspace->size);
-+	if (!stream) {
-+		pr_debug("BTRFS: ZSTD_initDStream failed\n");
-+		ret = -EIO;
-+		goto done;
-+	}
-+
-+	in_buf.src = kmap(pages_in[page_in_index]);
-+	in_buf.pos = 0;
-+	in_buf.size = min_t(size_t, srclen, PAGE_SIZE);
-+
-+	out_buf.dst = workspace->buf;
-+	out_buf.pos = 0;
-+	out_buf.size = PAGE_SIZE;
-+
-+	while (1) {
-+		size_t ret2;
-+
-+		ret2 = ZSTD_decompressStream(stream, &out_buf, &in_buf);
-+		if (ZSTD_isError(ret2)) {
-+			pr_debug("BTRFS: ZSTD_decompressStream returned %d\n",
-+					ZSTD_getErrorCode(ret2));
-+			ret = -EIO;
-+			goto done;
-+		}
-+		buf_start = total_out;
-+		total_out += out_buf.pos;
-+		out_buf.pos = 0;
-+
-+		ret = btrfs_decompress_buf2page(out_buf.dst, buf_start,
-+				total_out, disk_start, orig_bio);
-+		if (ret == 0)
-+			break;
-+
-+		if (in_buf.pos >= srclen)
-+			break;
-+
-+		/* Check if we've hit the end of a frame */
-+		if (ret2 == 0)
-+			break;
-+
-+		if (in_buf.pos == in_buf.size) {
-+			kunmap(pages_in[page_in_index++]);
-+			if (page_in_index >= total_pages_in) {
-+				in_buf.src = NULL;
-+				ret = -EIO;
-+				goto done;
-+			}
-+			srclen -= PAGE_SIZE;
-+			in_buf.src = kmap(pages_in[page_in_index]);
-+			in_buf.pos = 0;
-+			in_buf.size = min_t(size_t, srclen, PAGE_SIZE);
-+		}
-+	}
-+	ret = 0;
-+	zero_fill_bio(orig_bio);
-+done:
-+	if (in_buf.src)
-+		kunmap(pages_in[page_in_index]);
-+	return ret;
-+}
-+
-+static int zstd_decompress(struct list_head *ws, unsigned char *data_in,
-+		struct page *dest_page,
-+		unsigned long start_byte,
-+		size_t srclen, size_t destlen)
-+{
-+	struct workspace *workspace = list_entry(ws, struct workspace, list);
-+	ZSTD_DStream *stream;
-+	int ret = 0;
-+	size_t ret2;
-+	ZSTD_inBuffer in_buf = { NULL, 0, 0 };
-+	ZSTD_outBuffer out_buf = { NULL, 0, 0 };
-+	unsigned long total_out = 0;
-+	unsigned long pg_offset = 0;
-+	char *kaddr;
-+
-+	stream = ZSTD_initDStream(
-+			ZSTD_BTRFS_MAX_INPUT, workspace->mem, workspace->size);
-+	if (!stream) {
-+		pr_warn("BTRFS: ZSTD_initDStream failed\n");
-+		ret = -EIO;
-+		goto finish;
-+	}
-+
-+	destlen = min_t(size_t, destlen, PAGE_SIZE);
-+
-+	in_buf.src = data_in;
-+	in_buf.pos = 0;
-+	in_buf.size = srclen;
-+
-+	out_buf.dst = workspace->buf;
-+	out_buf.pos = 0;
-+	out_buf.size = PAGE_SIZE;
-+
-+	ret2 = 1;
-+	while (pg_offset < destlen && in_buf.pos < in_buf.size) {
-+		unsigned long buf_start;
-+		unsigned long buf_offset;
-+		unsigned long bytes;
-+
-+		/* Check if the frame is over and we still need more input */
-+		if (ret2 == 0) {
-+			pr_debug("BTRFS: ZSTD_decompressStream ended early\n");
-+			ret = -EIO;
-+			goto finish;
-+		}
-+		ret2 = ZSTD_decompressStream(stream, &out_buf, &in_buf);
-+		if (ZSTD_isError(ret2)) {
-+			pr_debug("BTRFS: ZSTD_decompressStream returned %d\n",
-+					ZSTD_getErrorCode(ret2));
-+			ret = -EIO;
-+			goto finish;
-+		}
-+
-+		buf_start = total_out;
-+		total_out += out_buf.pos;
-+		out_buf.pos = 0;
-+
-+		if (total_out <= start_byte)
-+			continue;
-+
-+		if (total_out > start_byte && buf_start < start_byte)
-+			buf_offset = start_byte - buf_start;
-+		else
-+			buf_offset = 0;
-+
-+		bytes = min_t(unsigned long, destlen - pg_offset,
-+				out_buf.size - buf_offset);
-+
-+		kaddr = kmap_atomic(dest_page);
-+		memcpy(kaddr + pg_offset, out_buf.dst + buf_offset, bytes);
-+		kunmap_atomic(kaddr);
-+
-+		pg_offset += bytes;
-+	}
-+	ret = 0;
-+finish:
-+	if (pg_offset < destlen) {
-+		kaddr = kmap_atomic(dest_page);
-+		memset(kaddr + pg_offset, 0, destlen - pg_offset);
-+		kunmap_atomic(kaddr);
-+	}
-+	return ret;
-+}
-+
-+const struct btrfs_compress_op btrfs_zstd_compress = {
-+	.alloc_workspace = zstd_alloc_workspace,
-+	.free_workspace = zstd_free_workspace,
-+	.compress_pages = zstd_compress_pages,
-+	.decompress_bio = zstd_decompress_bio,
-+	.decompress = zstd_decompress,
-+};
-diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
-index 9aa74f3..378230c 100644
--- a/include/uapi/linux/btrfs.h
-+++ b/include/uapi/linux/btrfs.h
-@@ -255,13 +255,7 @@ struct btrfs_ioctl_fs_info_args {
- #define BTRFS_FEATURE_INCOMPAT_DEFAULT_SUBVOL	(1ULL << 1)
- #define BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS	(1ULL << 2)
- #define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZO	(1ULL << 3)
-/*
- * some patches floated around with a second compression method
- * lets save that incompat here for when they do get in
- * Note we don't actually support it, we're just reserving the
- * number
- */
-#define BTRFS_FEATURE_INCOMPAT_COMPRESS_LZOv2	(1ULL << 4)
-+#define BTRFS_FEATURE_INCOMPAT_COMPRESS_ZSTD	(1ULL << 4)
-
- /*
-  * older kernels tried to do bigger metadata blocks, but the
--
-2.9.3
@@ -1,306 +0,0 @@
-From 46bf8f6d30d6ddf2446c110f122482b5e5e16933 Mon Sep 17 00:00:00 2001
-From: Sean Purcell <me@seanp.xyz>
-Date: Mon, 17 Jul 2017 17:08:59 -0700
-Subject: [PATCH v5 4/5] squashfs: Add zstd support
-
-Add zstd compression and decompression support to SquashFS. zstd is a
-great fit for SquashFS because it can compress at ratios approaching xz,
-while decompressing twice as fast as zlib. For SquashFS in particular,
-it can decompress as fast as lzo and lz4. It also has the flexibility
-to turn down the compression ratio for faster compression times.
-
-The compression benchmark is run on the file tree from the SquashFS archive
-found in ubuntu-16.10-desktop-amd64.iso [1]. It uses `mksquashfs` with the
-default block size (128 KB) and and various compression algorithms/levels.
-xz and zstd are also benchmarked with 256 KB blocks. The decompression
-benchmark times how long it takes to `tar` the file tree into `/dev/null`.
-See the benchmark file in the upstream zstd source repository located under
-`contrib/linux-kernel/squashfs-benchmark.sh` [2] for details.
-
-I ran the benchmarks on a Ubuntu 14.04 VM with 2 cores and 4 GiB of RAM.
-The VM is running on a MacBook Pro with a 3.1 GHz Intel Core i7 processor,
-16 GB of RAM, and a SSD.
-
-| Method         | Ratio | Compression MB/s | Decompression MB/s |
-|----------------|-------|------------------|--------------------|
-| gzip           |  2.92 |               15 |                128 |
-| lzo            |  2.64 |              9.5 |                217 |
-| lz4            |  2.12 |               94 |                218 |
-| xz             |  3.43 |              5.5 |                 35 |
-| xz 256 KB      |  3.53 |              5.4 |                 40 |
-| zstd 1         |  2.71 |               96 |                210 |
-| zstd 5         |  2.93 |               69 |                198 |
-| zstd 10        |  3.01 |               41 |                225 |
-| zstd 15        |  3.13 |             11.4 |                224 |
-| zstd 16 256 KB |  3.24 |              8.1 |                210 |
-
-This patch was written by Sean Purcell <me@seanp.xyz>, but I will be
-taking over the submission process.
-
-[1] http://releases.ubuntu.com/16.10/
-[2] https://github.com/facebook/zstd/blob/dev/contrib/linux-kernel/squashfs-benchmark.sh
-
-zstd source repository: https://github.com/facebook/zstd
-
-Signed-off-by: Sean Purcell <me@seanp.xyz>
-Signed-off-by: Nick Terrell <terrelln@fb.com>
---
-v3 -> v4:
- Fix minor linter warnings
-
-v4 -> v5:
- Fix ZSTD_DStream initialization code in squashfs
- Fix patch documentation to reflect that Sean Purcell is the author
-
- fs/squashfs/Kconfig        |  14 +++++
- fs/squashfs/Makefile       |   1 +
- fs/squashfs/decompressor.c |   7 +++
- fs/squashfs/decompressor.h |   4 ++
- fs/squashfs/squashfs_fs.h  |   1 +
- fs/squashfs/zstd_wrapper.c | 151 +++++++++++++++++++++++++++++++++++++++++++++
- 6 files changed, 178 insertions(+)
- create mode 100644 fs/squashfs/zstd_wrapper.c
-
-diff --git a/fs/squashfs/Kconfig b/fs/squashfs/Kconfig
-index ffb093e..1adb334 100644
--- a/fs/squashfs/Kconfig
-+++ b/fs/squashfs/Kconfig
-@@ -165,6 +165,20 @@ config SQUASHFS_XZ
-
- 	  If unsure, say N.
-
-+config SQUASHFS_ZSTD
-+	bool "Include support for ZSTD compressed file systems"
-+	depends on SQUASHFS
-+	select ZSTD_DECOMPRESS
-+	help
-+	  Saying Y here includes support for reading Squashfs file systems
-+	  compressed with ZSTD compression.  ZSTD gives better compression than
-+	  the default ZLIB compression, while using less CPU.
-+
-+	  ZSTD is not the standard compression used in Squashfs and so most
-+	  file systems will be readable without selecting this option.
-+
-+	  If unsure, say N.
-+
- config SQUASHFS_4K_DEVBLK_SIZE
- 	bool "Use 4K device block size?"
- 	depends on SQUASHFS
-diff --git a/fs/squashfs/Makefile b/fs/squashfs/Makefile
-index 246a6f3..6655631 100644
--- a/fs/squashfs/Makefile
-+++ b/fs/squashfs/Makefile
-@@ -15,3 +15,4 @@ squashfs-$(CONFIG_SQUASHFS_LZ4) += lz4_wrapper.o
- squashfs-$(CONFIG_SQUASHFS_LZO) += lzo_wrapper.o
- squashfs-$(CONFIG_SQUASHFS_XZ) += xz_wrapper.o
- squashfs-$(CONFIG_SQUASHFS_ZLIB) += zlib_wrapper.o
-+squashfs-$(CONFIG_SQUASHFS_ZSTD) += zstd_wrapper.o
-diff --git a/fs/squashfs/decompressor.c b/fs/squashfs/decompressor.c
-index d2bc136..8366398 100644
--- a/fs/squashfs/decompressor.c
-+++ b/fs/squashfs/decompressor.c
-@@ -65,6 +65,12 @@ static const struct squashfs_decompressor squashfs_zlib_comp_ops = {
- };
- #endif
-
-+#ifndef CONFIG_SQUASHFS_ZSTD
-+static const struct squashfs_decompressor squashfs_zstd_comp_ops = {
-+	NULL, NULL, NULL, NULL, ZSTD_COMPRESSION, "zstd", 0
-+};
-+#endif
-+
- static const struct squashfs_decompressor squashfs_unknown_comp_ops = {
- 	NULL, NULL, NULL, NULL, 0, "unknown", 0
- };
-@@ -75,6 +81,7 @@ static const struct squashfs_decompressor *decompressor[] = {
- 	&squashfs_lzo_comp_ops,
- 	&squashfs_xz_comp_ops,
- 	&squashfs_lzma_unsupported_comp_ops,
-+	&squashfs_zstd_comp_ops,
- 	&squashfs_unknown_comp_ops
- };
-
-diff --git a/fs/squashfs/decompressor.h b/fs/squashfs/decompressor.h
-index a25713c..0f5a8e4 100644
--- a/fs/squashfs/decompressor.h
-+++ b/fs/squashfs/decompressor.h
-@@ -58,4 +58,8 @@ extern const struct squashfs_decompressor squashfs_lzo_comp_ops;
- extern const struct squashfs_decompressor squashfs_zlib_comp_ops;
- #endif
-
-+#ifdef CONFIG_SQUASHFS_ZSTD
-+extern const struct squashfs_decompressor squashfs_zstd_comp_ops;
-+#endif
-+
- #endif
-diff --git a/fs/squashfs/squashfs_fs.h b/fs/squashfs/squashfs_fs.h
-index 506f4ba..24d12fd 100644
--- a/fs/squashfs/squashfs_fs.h
-+++ b/fs/squashfs/squashfs_fs.h
-@@ -241,6 +241,7 @@ struct meta_index {
- #define LZO_COMPRESSION		3
- #define XZ_COMPRESSION		4
- #define LZ4_COMPRESSION		5
-+#define ZSTD_COMPRESSION	6
-
- struct squashfs_super_block {
- 	__le32			s_magic;
-diff --git a/fs/squashfs/zstd_wrapper.c b/fs/squashfs/zstd_wrapper.c
-new file mode 100644
-index 0000000..eeaabf8
--- /dev/null
-+++ b/fs/squashfs/zstd_wrapper.c
-@@ -0,0 +1,151 @@
-+/*
-+ * Squashfs - a compressed read only filesystem for Linux
-+ *
-+ * Copyright (c) 2016-present, Facebook, Inc.
-+ * All rights reserved.
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version 2,
-+ * or (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * zstd_wrapper.c
-+ */
-+
-+#include <linux/mutex.h>
-+#include <linux/buffer_head.h>
-+#include <linux/slab.h>
-+#include <linux/zstd.h>
-+#include <linux/vmalloc.h>
-+
-+#include "squashfs_fs.h"
-+#include "squashfs_fs_sb.h"
-+#include "squashfs.h"
-+#include "decompressor.h"
-+#include "page_actor.h"
-+
-+struct workspace {
-+	void *mem;
-+	size_t mem_size;
-+	size_t window_size;
-+};
-+
-+static void *zstd_init(struct squashfs_sb_info *msblk, void *buff)
-+{
-+	struct workspace *wksp = kmalloc(sizeof(*wksp), GFP_KERNEL);
-+
-+	if (wksp == NULL)
-+		goto failed;
-+	wksp->window_size = max_t(size_t,
-+			msblk->block_size, SQUASHFS_METADATA_SIZE);
-+	wksp->mem_size = ZSTD_DStreamWorkspaceBound(wksp->window_size);
-+	wksp->mem = vmalloc(wksp->mem_size);
-+	if (wksp->mem == NULL)
-+		goto failed;
-+
-+	return wksp;
-+
-+failed:
-+	ERROR("Failed to allocate zstd workspace\n");
-+	kfree(wksp);
-+	return ERR_PTR(-ENOMEM);
-+}
-+
-+
-+static void zstd_free(void *strm)
-+{
-+	struct workspace *wksp = strm;
-+
-+	if (wksp)
-+		vfree(wksp->mem);
-+	kfree(wksp);
-+}
-+
-+
-+static int zstd_uncompress(struct squashfs_sb_info *msblk, void *strm,
-+	struct buffer_head **bh, int b, int offset, int length,
-+	struct squashfs_page_actor *output)
-+{
-+	struct workspace *wksp = strm;
-+	ZSTD_DStream *stream;
-+	size_t total_out = 0;
-+	size_t zstd_err;
-+	int k = 0;
-+	ZSTD_inBuffer in_buf = { NULL, 0, 0 };
-+	ZSTD_outBuffer out_buf = { NULL, 0, 0 };
-+
-+	stream = ZSTD_initDStream(wksp->window_size, wksp->mem, wksp->mem_size);
-+
-+	if (!stream) {
-+		ERROR("Failed to initialize zstd decompressor\n");
-+		goto out;
-+	}
-+
-+	out_buf.size = PAGE_SIZE;
-+	out_buf.dst = squashfs_first_page(output);
-+
-+	do {
-+		if (in_buf.pos == in_buf.size && k < b) {
-+			int avail = min(length, msblk->devblksize - offset);
-+
-+			length -= avail;
-+			in_buf.src = bh[k]->b_data + offset;
-+			in_buf.size = avail;
-+			in_buf.pos = 0;
-+			offset = 0;
-+		}
-+
-+		if (out_buf.pos == out_buf.size) {
-+			out_buf.dst = squashfs_next_page(output);
-+			if (out_buf.dst == NULL) {
-+				/* Shouldn't run out of pages
-+				 * before stream is done.
-+				 */
-+				squashfs_finish_page(output);
-+				goto out;
-+			}
-+			out_buf.pos = 0;
-+			out_buf.size = PAGE_SIZE;
-+		}
-+
-+		total_out -= out_buf.pos;
-+		zstd_err = ZSTD_decompressStream(stream, &out_buf, &in_buf);
-+		total_out += out_buf.pos; /* add the additional data produced */
-+
-+		if (in_buf.pos == in_buf.size && k < b)
-+			put_bh(bh[k++]);
-+	} while (zstd_err != 0 && !ZSTD_isError(zstd_err));
-+
-+	squashfs_finish_page(output);
-+
-+	if (ZSTD_isError(zstd_err)) {
-+		ERROR("zstd decompression error: %d\n",
-+				(int)ZSTD_getErrorCode(zstd_err));
-+		goto out;
-+	}
-+
-+	if (k < b)
-+		goto out;
-+
-+	return (int)total_out;
-+
-+out:
-+	for (; k < b; k++)
-+		put_bh(bh[k]);
-+
-+	return -EIO;
-+}
-+
-+const struct squashfs_decompressor squashfs_zstd_comp_ops = {
-+	.init = zstd_init,
-+	.free = zstd_free,
-+	.decompress = zstd_uncompress,
-+	.id = ZSTD_COMPRESSION,
-+	.name = "zstd",
-+	.supported = 1
-+};
--
-2.9.3
@@ -1,424 +0,0 @@
-From 308795a7713ca6fcd468b60fba9a2fca99cee6a0 Mon Sep 17 00:00:00 2001
-From: Nick Terrell <terrelln@fb.com>
-Date: Wed, 2 Aug 2017 18:02:13 -0700
-Subject: [PATCH v5 5/5] crypto: Add zstd support
-
-Adds zstd support to crypto and scompress. Only supports the default
-level.
-
-Signed-off-by: Nick Terrell <terrelln@fb.com>
---
- crypto/Kconfig   |   9 ++
- crypto/Makefile  |   1 +
- crypto/testmgr.c |  10 +++
- crypto/testmgr.h |  71 +++++++++++++++
- crypto/zstd.c    | 265 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
- 5 files changed, 356 insertions(+)
- create mode 100644 crypto/zstd.c
-
-diff --git a/crypto/Kconfig b/crypto/Kconfig
-index caa770e..4fc3936 100644
--- a/crypto/Kconfig
-+++ b/crypto/Kconfig
-@@ -1662,6 +1662,15 @@ config CRYPTO_LZ4HC
- 	help
- 	  This is the LZ4 high compression mode algorithm.
-
-+config CRYPTO_ZSTD
-+	tristate "Zstd compression algorithm"
-+	select CRYPTO_ALGAPI
-+	select CRYPTO_ACOMP2
-+	select ZSTD_COMPRESS
-+	select ZSTD_DECOMPRESS
-+	help
-+	  This is the zstd algorithm.
-+
- comment "Random Number Generation"
-
- config CRYPTO_ANSI_CPRNG
-diff --git a/crypto/Makefile b/crypto/Makefile
-index d41f033..b22e1e8 100644
--- a/crypto/Makefile
-+++ b/crypto/Makefile
-@@ -133,6 +133,7 @@ obj-$(CONFIG_CRYPTO_USER_API_HASH) += algif_hash.o
- obj-$(CONFIG_CRYPTO_USER_API_SKCIPHER) += algif_skcipher.o
- obj-$(CONFIG_CRYPTO_USER_API_RNG) += algif_rng.o
- obj-$(CONFIG_CRYPTO_USER_API_AEAD) += algif_aead.o
-+obj-$(CONFIG_CRYPTO_ZSTD) += zstd.o
-
- ecdh_generic-y := ecc.o
- ecdh_generic-y += ecdh.o
-diff --git a/crypto/testmgr.c b/crypto/testmgr.c
-index 7125ba3..8a124d3 100644
--- a/crypto/testmgr.c
-+++ b/crypto/testmgr.c
-@@ -3603,6 +3603,16 @@ static const struct alg_test_desc alg_test_descs[] = {
- 				.decomp = __VECS(zlib_deflate_decomp_tv_template)
- 			}
- 		}
-+	}, {
-+		.alg = "zstd",
-+		.test = alg_test_comp,
-+		.fips_allowed = 1,
-+		.suite = {
-+			.comp = {
-+				.comp = __VECS(zstd_comp_tv_template),
-+				.decomp = __VECS(zstd_decomp_tv_template)
-+			}
-+		}
- 	}
- };
-
-diff --git a/crypto/testmgr.h b/crypto/testmgr.h
-index 6ceb0e2..e6b5920 100644
--- a/crypto/testmgr.h
-+++ b/crypto/testmgr.h
-@@ -34631,4 +34631,75 @@ static const struct comp_testvec lz4hc_decomp_tv_template[] = {
- 	},
- };
-
-+static const struct comp_testvec zstd_comp_tv_template[] = {
-+	{
-+		.inlen	= 68,
-+		.outlen	= 39,
-+		.input	= "The algorithm is zstd. "
-+			  "The algorithm is zstd. "
-+			  "The algorithm is zstd.",
-+		.output	= "\x28\xb5\x2f\xfd\x00\x50\xf5\x00\x00\xb8\x54\x68\x65"
-+			  "\x20\x61\x6c\x67\x6f\x72\x69\x74\x68\x6d\x20\x69\x73"
-+			  "\x20\x7a\x73\x74\x64\x2e\x20\x01\x00\x55\x73\x36\x01"
-+			  ,
-+	},
-+	{
-+		.inlen	= 244,
-+		.outlen	= 151,
-+		.input	= "zstd, short for Zstandard, is a fast lossless "
-+			  "compression algorithm, targeting real-time "
-+			  "compression scenarios at zlib-level and better "
-+			  "compression ratios. The zstd compression library "
-+			  "provides in-memory compression and decompression "
-+			  "functions.",
-+		.output	= "\x28\xb5\x2f\xfd\x00\x50\x75\x04\x00\x42\x4b\x1e\x17"
-+			  "\x90\x81\x31\x00\xf2\x2f\xe4\x36\xc9\xef\x92\x88\x32"
-+			  "\xc9\xf2\x24\x94\xd8\x68\x9a\x0f\x00\x0c\xc4\x31\x6f"
-+			  "\x0d\x0c\x38\xac\x5c\x48\x03\xcd\x63\x67\xc0\xf3\xad"
-+			  "\x4e\x90\xaa\x78\xa0\xa4\xc5\x99\xda\x2f\xb6\x24\x60"
-+			  "\xe2\x79\x4b\xaa\xb6\x6b\x85\x0b\xc9\xc6\x04\x66\x86"
-+			  "\xe2\xcc\xe2\x25\x3f\x4f\x09\xcd\xb8\x9d\xdb\xc1\x90"
-+			  "\xa9\x11\xbc\x35\x44\x69\x2d\x9c\x64\x4f\x13\x31\x64"
-+			  "\xcc\xfb\x4d\x95\x93\x86\x7f\x33\x7f\x1a\xef\xe9\x30"
-+			  "\xf9\x67\xa1\x94\x0a\x69\x0f\x60\xcd\xc3\xab\x99\xdc"
-+			  "\x42\xed\x97\x05\x00\x33\xc3\x15\x95\x3a\x06\xa0\x0e"
-+			  "\x20\xa9\x0e\x82\xb9\x43\x45\x01",
-+	},
-+};
-+
-+static const struct comp_testvec zstd_decomp_tv_template[] = {
-+	{
-+		.inlen	= 43,
-+		.outlen	= 68,
-+		.input	= "\x28\xb5\x2f\xfd\x04\x50\xf5\x00\x00\xb8\x54\x68\x65"
-+			  "\x20\x61\x6c\x67\x6f\x72\x69\x74\x68\x6d\x20\x69\x73"
-+			  "\x20\x7a\x73\x74\x64\x2e\x20\x01\x00\x55\x73\x36\x01"
-+			  "\x6b\xf4\x13\x35",
-+		.output	= "The algorithm is zstd. "
-+			  "The algorithm is zstd. "
-+			  "The algorithm is zstd.",
-+	},
-+	{
-+		.inlen	= 155,
-+		.outlen	= 244,
-+		.input	= "\x28\xb5\x2f\xfd\x04\x50\x75\x04\x00\x42\x4b\x1e\x17"
-+			  "\x90\x81\x31\x00\xf2\x2f\xe4\x36\xc9\xef\x92\x88\x32"
-+			  "\xc9\xf2\x24\x94\xd8\x68\x9a\x0f\x00\x0c\xc4\x31\x6f"
-+			  "\x0d\x0c\x38\xac\x5c\x48\x03\xcd\x63\x67\xc0\xf3\xad"
-+			  "\x4e\x90\xaa\x78\xa0\xa4\xc5\x99\xda\x2f\xb6\x24\x60"
-+			  "\xe2\x79\x4b\xaa\xb6\x6b\x85\x0b\xc9\xc6\x04\x66\x86"
-+			  "\xe2\xcc\xe2\x25\x3f\x4f\x09\xcd\xb8\x9d\xdb\xc1\x90"
-+			  "\xa9\x11\xbc\x35\x44\x69\x2d\x9c\x64\x4f\x13\x31\x64"
-+			  "\xcc\xfb\x4d\x95\x93\x86\x7f\x33\x7f\x1a\xef\xe9\x30"
-+			  "\xf9\x67\xa1\x94\x0a\x69\x0f\x60\xcd\xc3\xab\x99\xdc"
-+			  "\x42\xed\x97\x05\x00\x33\xc3\x15\x95\x3a\x06\xa0\x0e"
-+			  "\x20\xa9\x0e\x82\xb9\x43\x45\x01\xaa\x6d\xda\x0d",
-+		.output	= "zstd, short for Zstandard, is a fast lossless "
-+			  "compression algorithm, targeting real-time "
-+			  "compression scenarios at zlib-level and better "
-+			  "compression ratios. The zstd compression library "
-+			  "provides in-memory compression and decompression "
-+			  "functions.",
-+	},
-+};
- #endif	/* _CRYPTO_TESTMGR_H */
-diff --git a/crypto/zstd.c b/crypto/zstd.c
-new file mode 100644
-index 0000000..9a76b3e
--- /dev/null
-+++ b/crypto/zstd.c
-@@ -0,0 +1,265 @@
-+/*
-+ * Cryptographic API.
-+ *
-+ * Copyright (c) 2017-present, Facebook, Inc.
-+ *
-+ * This program is free software; you can redistribute it and/or modify it
-+ * under the terms of the GNU General Public License version 2 as published by
-+ * the Free Software Foundation.
-+ *
-+ * This program is distributed in the hope that it will be useful, but WITHOUT
-+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
-+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
-+ * more details.
-+ */
-+#include <linux/crypto.h>
-+#include <linux/init.h>
-+#include <linux/interrupt.h>
-+#include <linux/mm.h>
-+#include <linux/module.h>
-+#include <linux/net.h>
-+#include <linux/vmalloc.h>
-+#include <linux/zstd.h>
-+#include <crypto/internal/scompress.h>
-+
-+
-+#define ZSTD_DEF_LEVEL	3
-+
-+struct zstd_ctx {
-+	ZSTD_CCtx *cctx;
-+	ZSTD_DCtx *dctx;
-+	void *cwksp;
-+	void *dwksp;
-+};
-+
-+static ZSTD_parameters zstd_params(void)
-+{
-+	return ZSTD_getParams(ZSTD_DEF_LEVEL, 0, 0);
-+}
-+
-+static int zstd_comp_init(struct zstd_ctx *ctx)
-+{
-+	int ret = 0;
-+	const ZSTD_parameters params = zstd_params();
-+	const size_t wksp_size = ZSTD_CCtxWorkspaceBound(params.cParams);
-+
-+	ctx->cwksp = vzalloc(wksp_size);
-+	if (!ctx->cwksp) {
-+		ret = -ENOMEM;
-+		goto out;
-+	}
-+
-+	ctx->cctx = ZSTD_initCCtx(ctx->cwksp, wksp_size);
-+	if (!ctx->cctx) {
-+		ret = -EINVAL;
-+		goto out_free;
-+	}
-+out:
-+	return ret;
-+out_free:
-+	vfree(ctx->cwksp);
-+	goto out;
-+}
-+
-+static int zstd_decomp_init(struct zstd_ctx *ctx)
-+{
-+	int ret = 0;
-+	const size_t wksp_size = ZSTD_DCtxWorkspaceBound();
-+
-+	ctx->dwksp = vzalloc(wksp_size);
-+	if (!ctx->dwksp) {
-+		ret = -ENOMEM;
-+		goto out;
-+	}
-+
-+	ctx->dctx = ZSTD_initDCtx(ctx->dwksp, wksp_size);
-+	if (!ctx->dctx) {
-+		ret = -EINVAL;
-+		goto out_free;
-+	}
-+out:
-+	return ret;
-+out_free:
-+	vfree(ctx->dwksp);
-+	goto out;
-+}
-+
-+static void zstd_comp_exit(struct zstd_ctx *ctx)
-+{
-+	vfree(ctx->cwksp);
-+	ctx->cwksp = NULL;
-+	ctx->cctx = NULL;
-+}
-+
-+static void zstd_decomp_exit(struct zstd_ctx *ctx)
-+{
-+	vfree(ctx->dwksp);
-+	ctx->dwksp = NULL;
-+	ctx->dctx = NULL;
-+}
-+
-+static int __zstd_init(void *ctx)
-+{
-+	int ret;
-+
-+	ret = zstd_comp_init(ctx);
-+	if (ret)
-+		return ret;
-+	ret = zstd_decomp_init(ctx);
-+	if (ret)
-+		zstd_comp_exit(ctx);
-+	return ret;
-+}
-+
-+static void *zstd_alloc_ctx(struct crypto_scomp *tfm)
-+{
-+	int ret;
-+	struct zstd_ctx *ctx;
-+
-+	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
-+	if (!ctx)
-+		return ERR_PTR(-ENOMEM);
-+
-+	ret = __zstd_init(ctx);
-+	if (ret) {
-+		kfree(ctx);
-+		return ERR_PTR(ret);
-+	}
-+
-+	return ctx;
-+}
-+
-+static int zstd_init(struct crypto_tfm *tfm)
-+{
-+	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
-+
-+	return __zstd_init(ctx);
-+}
-+
-+static void __zstd_exit(void *ctx)
-+{
-+	zstd_comp_exit(ctx);
-+	zstd_decomp_exit(ctx);
-+}
-+
-+static void zstd_free_ctx(struct crypto_scomp *tfm, void *ctx)
-+{
-+	__zstd_exit(ctx);
-+	kzfree(ctx);
-+}
-+
-+static void zstd_exit(struct crypto_tfm *tfm)
-+{
-+	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
-+
-+	__zstd_exit(ctx);
-+}
-+
-+static int __zstd_compress(const u8 *src, unsigned int slen,
-+			   u8 *dst, unsigned int *dlen, void *ctx)
-+{
-+	size_t out_len;
-+	struct zstd_ctx *zctx = ctx;
-+	const ZSTD_parameters params = zstd_params();
-+
-+	out_len = ZSTD_compressCCtx(zctx->cctx, dst, *dlen, src, slen, params);
-+	if (ZSTD_isError(out_len))
-+		return -EINVAL;
-+	*dlen = out_len;
-+	return 0;
-+}
-+
-+static int zstd_compress(struct crypto_tfm *tfm, const u8 *src,
-+			 unsigned int slen, u8 *dst, unsigned int *dlen)
-+{
-+	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
-+
-+	return __zstd_compress(src, slen, dst, dlen, ctx);
-+}
-+
-+static int zstd_scompress(struct crypto_scomp *tfm, const u8 *src,
-+			  unsigned int slen, u8 *dst, unsigned int *dlen,
-+			  void *ctx)
-+{
-+	return __zstd_compress(src, slen, dst, dlen, ctx);
-+}
-+
-+static int __zstd_decompress(const u8 *src, unsigned int slen,
-+			     u8 *dst, unsigned int *dlen, void *ctx)
-+{
-+	size_t out_len;
-+	struct zstd_ctx *zctx = ctx;
-+
-+	out_len = ZSTD_decompressDCtx(zctx->dctx, dst, *dlen, src, slen);
-+	if (ZSTD_isError(out_len))
-+		return -EINVAL;
-+	*dlen = out_len;
-+	return 0;
-+}
-+
-+static int zstd_decompress(struct crypto_tfm *tfm, const u8 *src,
-+			   unsigned int slen, u8 *dst, unsigned int *dlen)
-+{
-+	struct zstd_ctx *ctx = crypto_tfm_ctx(tfm);
-+
-+	return __zstd_decompress(src, slen, dst, dlen, ctx);
-+}
-+
-+static int zstd_sdecompress(struct crypto_scomp *tfm, const u8 *src,
-+			    unsigned int slen, u8 *dst, unsigned int *dlen,
-+			    void *ctx)
-+{
-+	return __zstd_decompress(src, slen, dst, dlen, ctx);
-+}
-+
-+static struct crypto_alg alg = {
-+	.cra_name		= "zstd",
-+	.cra_flags		= CRYPTO_ALG_TYPE_COMPRESS,
-+	.cra_ctxsize		= sizeof(struct zstd_ctx),
-+	.cra_module		= THIS_MODULE,
-+	.cra_init		= zstd_init,
-+	.cra_exit		= zstd_exit,
-+	.cra_u			= { .compress = {
-+	.coa_compress		= zstd_compress,
-+	.coa_decompress		= zstd_decompress } }
-+};
-+
-+static struct scomp_alg scomp = {
-+	.alloc_ctx		= zstd_alloc_ctx,
-+	.free_ctx		= zstd_free_ctx,
-+	.compress		= zstd_scompress,
-+	.decompress		= zstd_sdecompress,
-+	.base			= {
-+		.cra_name	= "zstd",
-+		.cra_driver_name = "zstd-scomp",
-+		.cra_module	 = THIS_MODULE,
-+	}
-+};
-+
-+static int __init zstd_mod_init(void)
-+{
-+	int ret;
-+
-+	ret = crypto_register_alg(&alg);
-+	if (ret)
-+		return ret;
-+
-+	ret = crypto_register_scomp(&scomp);
-+	if (ret)
-+		crypto_unregister_alg(&alg);
-+
-+	return ret;
-+}
-+
-+static void __exit zstd_mod_fini(void)
-+{
-+	crypto_unregister_alg(&alg);
-+	crypto_unregister_scomp(&scomp);
-+}
-+
-+module_init(zstd_mod_init);
-+module_exit(zstd_mod_fini);
-+
-+MODULE_LICENSE("GPL");
-+MODULE_DESCRIPTION("Zstd Compression Algorithm");
-+MODULE_ALIAS_CRYPTO("zstd");
--
-2.9.3
@@ -1,420 +0,0 @@
-From 57a3cf95b276946559f9e044c7352c11303bb9c1 Mon Sep 17 00:00:00 2001
-From: Sean Purcell <me@seanp.xyz>
-Date: Thu, 3 Aug 2017 17:47:03 -0700
-Subject: [PATCH v6] squashfs-tools: Add zstd support
-
-This patch adds zstd support to squashfs-tools. It works with zstd
-versions >= 1.0.0. It was originally written by Sean Purcell.
-
-Signed-off-by: Sean Purcell <me@seanp.xyz>
-Signed-off-by: Nick Terrell <terrelln@fb.com>
---
-v4 -> v5:
- Fix patch documentation to reflect that Sean Purcell is the author
- Don't strip trailing whitespace of unrelated code
- Make zstd_display_options() static
-
-v5 -> v6:
- Fix build instructions in Makefile
-
- squashfs-tools/Makefile       |  20 ++++
- squashfs-tools/compressor.c   |   8 ++
- squashfs-tools/squashfs_fs.h  |   1 +
- squashfs-tools/zstd_wrapper.c | 254 ++++++++++++++++++++++++++++++++++++++++++
- squashfs-tools/zstd_wrapper.h |  48 ++++++++
- 5 files changed, 331 insertions(+)
- create mode 100644 squashfs-tools/zstd_wrapper.c
- create mode 100644 squashfs-tools/zstd_wrapper.h
-
-diff --git a/squashfs-tools/Makefile b/squashfs-tools/Makefile
-index 52d2582..22fc559 100644
--- a/squashfs-tools/Makefile
-+++ b/squashfs-tools/Makefile
-@@ -75,6 +75,18 @@ GZIP_SUPPORT = 1
- #LZMA_SUPPORT = 1
- #LZMA_DIR = ../../../../LZMA/lzma465
-
-+
-+########### Building ZSTD support ############
-+#
-+# The ZSTD library is supported
-+# ZSTD homepage: http://zstd.net
-+# ZSTD source repository: https://github.com/facebook/zstd
-+#
-+# To build using the ZSTD library - install the library and uncomment the
-+# ZSTD_SUPPORT line below.
-+#
-+#ZSTD_SUPPORT = 1
-+
- ######## Specifying default compression ########
- #
- # The next line specifies which compression algorithm is used by default
-@@ -177,6 +189,14 @@ LIBS += -llz4
- COMPRESSORS += lz4
- endif
-
-+ifeq ($(ZSTD_SUPPORT),1)
-+CFLAGS += -DZSTD_SUPPORT
-+MKSQUASHFS_OBJS += zstd_wrapper.o
-+UNSQUASHFS_OBJS += zstd_wrapper.o
-+LIBS += -lzstd
-+COMPRESSORS += zstd
-+endif
-+
- ifeq ($(XATTR_SUPPORT),1)
- ifeq ($(XATTR_DEFAULT),1)
- CFLAGS += -DXATTR_SUPPORT -DXATTR_DEFAULT
-diff --git a/squashfs-tools/compressor.c b/squashfs-tools/compressor.c
-index 525e316..02b5e90 100644
--- a/squashfs-tools/compressor.c
-+++ b/squashfs-tools/compressor.c
-@@ -65,6 +65,13 @@ static struct compressor xz_comp_ops = {
- extern struct compressor xz_comp_ops;
- #endif
-
-+#ifndef ZSTD_SUPPORT
-+static struct compressor zstd_comp_ops = {
-+	ZSTD_COMPRESSION, "zstd"
-+};
-+#else
-+extern struct compressor zstd_comp_ops;
-+#endif
-
- static struct compressor unknown_comp_ops = {
- 	0, "unknown"
-@@ -77,6 +84,7 @@ struct compressor *compressor[] = {
- 	&lzo_comp_ops,
- 	&lz4_comp_ops,
- 	&xz_comp_ops,
-+	&zstd_comp_ops,
- 	&unknown_comp_ops
- };
-
-diff --git a/squashfs-tools/squashfs_fs.h b/squashfs-tools/squashfs_fs.h
-index 791fe12..afca918 100644
--- a/squashfs-tools/squashfs_fs.h
-+++ b/squashfs-tools/squashfs_fs.h
-@@ -277,6 +277,7 @@ typedef long long		squashfs_inode;
- #define LZO_COMPRESSION		3
- #define XZ_COMPRESSION		4
- #define LZ4_COMPRESSION		5
-+#define ZSTD_COMPRESSION	6
-
- struct squashfs_super_block {
- 	unsigned int		s_magic;
-diff --git a/squashfs-tools/zstd_wrapper.c b/squashfs-tools/zstd_wrapper.c
-new file mode 100644
-index 0000000..dcab75a
--- /dev/null
-+++ b/squashfs-tools/zstd_wrapper.c
-@@ -0,0 +1,254 @@
-+/*
-+ * Copyright (c) 2017
-+ * Phillip Lougher <phillip@squashfs.org.uk>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version 2,
-+ * or (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * zstd_wrapper.c
-+ *
-+ * Support for ZSTD compression http://zstd.net
-+ */
-+
-+#include <stdio.h>
-+#include <string.h>
-+#include <stdlib.h>
-+#include <zstd.h>
-+#include <zstd_errors.h>
-+
-+#include "squashfs_fs.h"
-+#include "zstd_wrapper.h"
-+#include "compressor.h"
-+
-+static int compression_level = ZSTD_DEFAULT_COMPRESSION_LEVEL;
-+
-+/*
-+ * This function is called by the options parsing code in mksquashfs.c
-+ * to parse any -X compressor option.
-+ *
-+ * This function returns:
-+ *	>=0 (number of additional args parsed) on success
-+ *	-1 if the option was unrecognised, or
-+ *	-2 if the option was recognised, but otherwise bad in
-+ *	   some way (e.g. invalid parameter)
-+ *
-+ * Note: this function sets internal compressor state, but does not
-+ * pass back the results of the parsing other than success/failure.
-+ * The zstd_dump_options() function is called later to get the options in
-+ * a format suitable for writing to the filesystem.
-+ */
-+static int zstd_options(char *argv[], int argc)
-+{
-+	if (strcmp(argv[0], "-Xcompression-level") == 0) {
-+		if (argc < 2) {
-+			fprintf(stderr, "zstd: -Xcompression-level missing "
-+				"compression level\n");
-+			fprintf(stderr, "zstd: -Xcompression-level it should "
-+				"be 1 <= n <= %d\n", ZSTD_maxCLevel());
-+			goto failed;
-+		}
-+
-+		compression_level = atoi(argv[1]);
-+		if (compression_level < 1 ||
-+		    compression_level > ZSTD_maxCLevel()) {
-+			fprintf(stderr, "zstd: -Xcompression-level invalid, it "
-+				"should be 1 <= n <= %d\n", ZSTD_maxCLevel());
-+			goto failed;
-+		}
-+
-+		return 1;
-+	}
-+
-+	return -1;
-+failed:
-+	return -2;
-+}
-+
-+/*
-+ * This function is called by mksquashfs to dump the parsed
-+ * compressor options in a format suitable for writing to the
-+ * compressor options field in the filesystem (stored immediately
-+ * after the superblock).
-+ *
-+ * This function returns a pointer to the compression options structure
-+ * to be stored (and the size), or NULL if there are no compression
-+ * options.
-+ */
-+static void *zstd_dump_options(int block_size, int *size)
-+{
-+	static struct zstd_comp_opts comp_opts;
-+
-+	/* don't return anything if the options are all default */
-+	if (compression_level == ZSTD_DEFAULT_COMPRESSION_LEVEL)
-+		return NULL;
-+
-+	comp_opts.compression_level = compression_level;
-+
-+	SQUASHFS_INSWAP_COMP_OPTS(&comp_opts);
-+
-+	*size = sizeof(comp_opts);
-+	return &comp_opts;
-+}
-+
-+/*
-+ * This function is a helper specifically for the append mode of
-+ * mksquashfs.  Its purpose is to set the internal compressor state
-+ * to the stored compressor options in the passed compressor options
-+ * structure.
-+ *
-+ * In effect this function sets up the compressor options
-+ * to the same state they were when the filesystem was originally
-+ * generated, this is to ensure on appending, the compressor uses
-+ * the same compression options that were used to generate the
-+ * original filesystem.
-+ *
-+ * Note, even if there are no compressor options, this function is still
-+ * called with an empty compressor structure (size == 0), to explicitly
-+ * set the default options, this is to ensure any user supplied
-+ * -X options on the appending mksquashfs command line are over-ridden.
-+ *
-+ * This function returns 0 on successful extraction of options, and -1 on error.
-+ */
-+static int zstd_extract_options(int block_size, void *buffer, int size)
-+{
-+	struct zstd_comp_opts *comp_opts = buffer;
-+
-+	if (size == 0) {
-+		/* Set default values */
-+		compression_level = ZSTD_DEFAULT_COMPRESSION_LEVEL;
-+		return 0;
-+	}
-+
-+	/* we expect a comp_opts structure of sufficient size to be present */
-+	if (size < sizeof(*comp_opts))
-+		goto failed;
-+
-+	SQUASHFS_INSWAP_COMP_OPTS(comp_opts);
-+
-+	if (comp_opts->compression_level < 1 ||
-+	    comp_opts->compression_level > ZSTD_maxCLevel()) {
-+		fprintf(stderr, "zstd: bad compression level in compression "
-+			"options structure\n");
-+		goto failed;
-+	}
-+
-+	compression_level = comp_opts->compression_level;
-+
-+	return 0;
-+
-+failed:
-+	fprintf(stderr, "zstd: error reading stored compressor options from "
-+		"filesystem!\n");
-+
-+	return -1;
-+}
-+
-+static void zstd_display_options(void *buffer, int size)
-+{
-+	struct zstd_comp_opts *comp_opts = buffer;
-+
-+	/* we expect a comp_opts structure of sufficient size to be present */
-+	if (size < sizeof(*comp_opts))
-+		goto failed;
-+
-+	SQUASHFS_INSWAP_COMP_OPTS(comp_opts);
-+
-+	if (comp_opts->compression_level < 1 ||
-+	    comp_opts->compression_level > ZSTD_maxCLevel()) {
-+		fprintf(stderr, "zstd: bad compression level in compression "
-+			"options structure\n");
-+		goto failed;
-+	}
-+
-+	printf("\tcompression-level %d\n", comp_opts->compression_level);
-+
-+	return;
-+
-+failed:
-+	fprintf(stderr, "zstd: error reading stored compressor options from "
-+		"filesystem!\n");
-+}
-+
-+/*
-+ * This function is called by mksquashfs to initialise the
-+ * compressor, before compress() is called.
-+ *
-+ * This function returns 0 on success, and -1 on error.
-+ */
-+static int zstd_init(void **strm, int block_size, int datablock)
-+{
-+	ZSTD_CCtx *cctx = ZSTD_createCCtx();
-+
-+	if (!cctx) {
-+		fprintf(stderr, "zstd: failed to allocate compression "
-+			"context!\n");
-+		return -1;
-+	}
-+
-+	*strm = cctx;
-+	return 0;
-+}
-+
-+static int zstd_compress(void *strm, void *dest, void *src, int size,
-+			 int block_size, int *error)
-+{
-+	const size_t res = ZSTD_compressCCtx((ZSTD_CCtx*)strm, dest, block_size,
-+					     src, size, compression_level);
-+
-+	if (ZSTD_isError(res)) {
-+		/* FIXME:
-+		 * zstd does not expose stable error codes. The error enum may
-+		 * change between versions. Until upstream zstd stablizes the
-+		 * error codes, we have no way of knowing why the error occurs.
-+		 * zstd shouldn't fail to compress any input unless there isn't
-+		 * enough output space. We assume that is the cause and return
-+		 * the special error code for not enough output space.
-+		 */
-+		return 0;
-+	}
-+
-+	return (int)res;
-+}
-+
-+static int zstd_uncompress(void *dest, void *src, int size, int outsize,
-+			   int *error)
-+{
-+	const size_t res = ZSTD_decompress(dest, outsize, src, size);
-+
-+	if (ZSTD_isError(res)) {
-+		fprintf(stderr, "\t%d %d\n", outsize, size);
-+
-+		*error = (int)ZSTD_getErrorCode(res);
-+		return -1;
-+	}
-+
-+	return (int)res;
-+}
-+
-+static void zstd_usage(void)
-+{
-+	fprintf(stderr, "\t  -Xcompression-level <compression-level>\n");
-+	fprintf(stderr, "\t\t<compression-level> should be 1 .. %d (default "
-+		"%d)\n", ZSTD_maxCLevel(), ZSTD_DEFAULT_COMPRESSION_LEVEL);
-+}
-+
-+struct compressor zstd_comp_ops = {
-+	.init = zstd_init,
-+	.compress = zstd_compress,
-+	.uncompress = zstd_uncompress,
-+	.options = zstd_options,
-+	.dump_options = zstd_dump_options,
-+	.extract_options = zstd_extract_options,
-+	.display_options = zstd_display_options,
-+	.usage = zstd_usage,
-+	.id = ZSTD_COMPRESSION,
-+	.name = "zstd",
-+	.supported = 1
-+};
-diff --git a/squashfs-tools/zstd_wrapper.h b/squashfs-tools/zstd_wrapper.h
-new file mode 100644
-index 0000000..4fbef0a
--- /dev/null
-+++ b/squashfs-tools/zstd_wrapper.h
-@@ -0,0 +1,48 @@
-+#ifndef ZSTD_WRAPPER_H
-+#define ZSTD_WRAPPER_H
-+/*
-+ * Squashfs
-+ *
-+ * Copyright (c) 2017
-+ * Phillip Lougher <phillip@squashfs.org.uk>
-+ *
-+ * This program is free software; you can redistribute it and/or
-+ * modify it under the terms of the GNU General Public License
-+ * as published by the Free Software Foundation; either version 2,
-+ * or (at your option) any later version.
-+ *
-+ * This program is distributed in the hope that it will be useful,
-+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
-+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
-+ * GNU General Public License for more details.
-+ *
-+ * zstd_wrapper.h
-+ *
-+ */
-+
-+#ifndef linux
-+#define __BYTE_ORDER BYTE_ORDER
-+#define __BIG_ENDIAN BIG_ENDIAN
-+#define __LITTLE_ENDIAN LITTLE_ENDIAN
-+#else
-+#include <endian.h>
-+#endif
-+
-+#if __BYTE_ORDER == __BIG_ENDIAN
-+extern unsigned int inswap_le16(unsigned short);
-+extern unsigned int inswap_le32(unsigned int);
-+
-+#define SQUASHFS_INSWAP_COMP_OPTS(s) { \
-+	(s)->compression_level = inswap_le32((s)->compression_level); \
-+}
-+#else
-+#define SQUASHFS_INSWAP_COMP_OPTS(s)
-+#endif
-+
-+/* Default compression */
-+#define ZSTD_DEFAULT_COMPRESSION_LEVEL 15
-+
-+struct zstd_comp_opts {
-+	int compression_level;
-+};
-+#endif
--
-2.9.5
@@ -1,339 +0,0 @@
-                    GNU GENERAL PUBLIC LICENSE
-                       Version 2, June 1991
-
- Copyright (C) 1989, 1991 Free Software Foundation, Inc.,
- 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
- Everyone is permitted to copy and distribute verbatim copies
- of this license document, but changing it is not allowed.
-
-                            Preamble
-
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-    This is free software, and you are welcome to redistribute it
-    under certain conditions; type `show c' for details.
-
-The hypothetical commands `show w' and `show c' should show the appropriate
-parts of the General Public License.  Of course, the commands you use may
-be called something other than `show w' and `show c'; they could even be
-mouse-clicks or menu items--whatever suits your program.
-
-You should also get your employer (if you work as a programmer) or your
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-
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-  `Gnomovision' (which makes passes at compilers) written by James Hacker.
-
-  <signature of Ty Coon>, 1 April 1989
-  Ty Coon, President of Vice
-
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@@ -0,0 +1,83 @@
+# ################################################################
+# Copyright (c) 2015-2020, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under both the BSD-style license (found in the
+# LICENSE file in the root directory of this source tree) and the GPLv2 (found
+# in the COPYING file in the root directory of this source tree).
+# You may select, at your option, one of the above-listed licenses.
+# ################################################################
+
+.PHONY: libzstd
+libzstd:
+	rm -rf linux
+	mkdir -p linux
+	mkdir -p linux/include/linux
+	mkdir -p linux/lib/zstd
+	../freestanding_lib/freestanding.py \
+		--source-lib ../../lib \
+		--output-lib linux/lib/zstd \
+		--xxhash '<linux/xxhash.h>' \
+		--xxh64-state 'struct xxh64_state' \
+		--xxh64-prefix 'xxh64' \
+		--rewrite-include '<limits\.h>=<linux/limits.h>' \
+		--rewrite-include '<stddef\.h>=<linux/types.h>' \
+		-DZSTD_NO_INTRINSICS \
+		-DZSTD_NO_UNUSED_FUNCTIONS \
+		-DZSTD_LEGACY_SUPPORT=0 \
+		-DZSTD_STATIC_LINKING_ONLY \
+		-DFSE_STATIC_LINKING_ONLY \
+		-DHUF_STATIC_LINKING_ONLY \
+		-DXXH_STATIC_LINKING_ONLY \
+		-DMEM_FORCE_MEMORY_ACCESS=0 \
+		-D__GNUC__ \
+		-DSTATIC_BMI2=0 \
+		-DZSTD_ADDRESS_SANITIZER=0 \
+		-DZSTD_MEMORY_SANITIZER=0 \
+		-DZSTD_COMPRESS_HEAPMODE=1 \
+		-UZSTD_NO_INLINE \
+		-UNO_PREFETCH \
+		-U__cplusplus \
+		-UZSTD_DLL_EXPORT \
+		-UZSTD_DLL_IMPORT \
+		-U__ICCARM__ \
+		-UZSTD_MULTITHREAD \
+		-U_MSC_VER \
+		-U_WIN32 \
+		-RZSTDLIB_VISIBILITY= \
+		-RZSTDERRORLIB_VISIBILITY=
+	cp linux_zstd.h linux/include/linux/zstd.h
+	cp zstd_compress_module.c linux/lib/zstd
+	cp zstd_decompress_module.c linux/lib/zstd
+	cp decompress_sources.h linux/lib/zstd
+	cp linux.mk linux/lib/zstd/Makefile
+
+LINUX ?= $(HOME)/repos/linux
+
+.PHONY: import
+import: libzstd
+	rm -f $(LINUX)/include/linux/zstd.h
+	rm -f $(LINUX)/include/linux/zstd_errors.h
+	rm -rf $(LINUX)/lib/zstd
+	cp linux/include/linux/zstd.h $(LINUX)/include/linux
+	cp -r linux/lib/zstd $(LINUX)/lib
+
+import-upstream:
+	rm -rf $(LINUX)/lib/zstd
+	mkdir $(LINUX)/lib/zstd
+	cp ../../lib/zstd.h $(LINUX)/lib/zstd
+	cp -r ../../lib/common $(LINUX)/lib/zstd
+	cp -r ../../lib/compress $(LINUX)/lib/zstd
+	cp -r ../../lib/decompress $(LINUX)/lib/zstd
+	rm $(LINUX)/lib/zstd/common/threading.*
+	rm $(LINUX)/lib/zstd/common/pool.*
+	rm $(LINUX)/lib/zstd/common/xxhash.*
+	rm $(LINUX)/lib/zstd/compress/zstdmt_*
+
+.PHONY: test
+test: libzstd
+	$(MAKE) -C test run-test CFLAGS="-O3 $(CFLAGS)" -j
+
+.PHONY: clean
+clean:
+	$(RM) -rf linux
@@ -1,101 +1,14 @@
-# Linux Kernel Patch
+# Zstd in the Linux Kernel

-There are four pieces, the `xxhash` kernel module, the `zstd_compress` and `zstd_decompress` kernel modules, the BtrFS patch, and the SquashFS patch.
-The patches are based off of the linux kernel master branch.
+This directory contains the scripts needed to transform upstream zstd into the version imported into the kernel. All the transforms are automated and tested by our continuous integration.

-## xxHash kernel module
+## Upgrading Zstd in the Linux Kernel

-* The patch is located in `xxhash.diff`.
-* The header is in `include/linux/xxhash.h`.
-* The source is in `lib/xxhash.c`.
-* `test/XXHashUserLandTest.cpp` contains tests for the patch in userland by mocking the kernel headers.
-  I tested the tests by commenting a line of of each branch in `xxhash.c` one line at a time, and made sure the tests failed.
-  It can be run with the following commands:
-  ```
-  cd test && make googletest && make XXHashUserLandTest && ./XXHashUserLandTest
-  ```
-* I also benchmarked the `xxhash` module against upstream xxHash, and made sure that they ran at the same speed.
-
-## Zstd Kernel modules
-
-* The (large) patch is located in `zstd.diff`, which depends on `xxhash.diff`.
-* The header is in `include/linux/zstd.h`.
-* It is split up into `zstd_compress` and `zstd_decompress`, which can be loaded independently.
-* Source files are in `lib/zstd/`.
-* `lib/Kconfig` and `lib/Makefile` need to be modified by applying `lib/Kconfig.diff` and `lib/Makefile.diff` respectively.
-  These changes are also included in the `zstd.diff`.
-* `test/UserlandTest.cpp` contains tests for the patch in userland by mocking the kernel headers.
-  It can be run with the following commands:
-  ```
-  cd test && make googletest && make UserlandTest && ./UserlandTest
-  ```
-
-## BtrFS
-
-* The patch is located in `btrfs.diff`.
-* Additionally `fs/btrfs/zstd.c` is provided as a source for convenience.
-* The patch seems to be working, it doesn't crash the kernel, and compresses at speeds and ratios that are expected.
-  It could still use some more testing for fringe features, like printing options.
-
-### Benchmarks
-
-Benchmarks run on a Ubuntu 14.04 with 2 cores and 4 GiB of RAM.
-The VM is running on a Macbook Pro with a 3.1 GHz Intel Core i7 processor,
-16 GB of ram, and a SSD.
-The kernel running was built from the master branch with the patch.
-
-The compression benchmark is copying 10 copies of the
-unzipped [silesia corpus](http://mattmahoney.net/dc/silesia.html) into a BtrFS
-filesystem mounted with `-o compress-force={none, lzo, zlib, zstd}`.
-The decompression benchmark is timing how long it takes to `tar` all 10 copies
-into `/dev/null`.
-The compression ratio is measured by comparing the output of `df` and `du`.
-See `btrfs-benchmark.sh` for details.
-
-| Algorithm | Compression ratio | Compression speed | Decompression speed |
-|-----------|-------------------|-------------------|---------------------|
-| None      | 0.99              | 504 MB/s          | 686 MB/s            |
-| lzo       | 1.66              | 398 MB/s          | 442 MB/s            |
-| zlib      | 2.58              | 65 MB/s           | 241 MB/s            |
-| zstd 1    | 2.57              | 260 MB/s          | 383 MB/s            |
-| zstd 3    | 2.71              | 174 MB/s          | 408 MB/s            |
-| zstd 6    | 2.87              | 70 MB/s           | 398 MB/s            |
-| zstd 9    | 2.92              | 43 MB/s           | 406 MB/s            |
-| zstd 12   | 2.93              | 21 MB/s           | 408 MB/s            |
-| zstd 15   | 3.01              | 11 MB/s           | 354 MB/s            |
-
-
-## SquashFS
-
-* The patch is located in `squashfs.diff`
-* Additionally `fs/squashfs/zstd_wrapper.c` is provided as a source for convenience.
-* The patch has been tested on the master branch of the kernel.
-
-### Benchmarks
-
-Benchmarks run on a Ubuntu 14.04 with 2 cores and 4 GiB of RAM.
-The VM is running on a Macbook Pro with a 3.1 GHz Intel Core i7 processor,
-16 GB of ram, and a SSD.
-The kernel running was built from the master branch with the patch.
-
-The compression benchmark is the file tree from the SquashFS archive found in the
-Ubuntu 16.10 desktop image (ubuntu-16.10-desktop-amd64.iso).
-The compression benchmark uses mksquashfs with the default block size (128 KB)
-and various compression algorithms/compression levels.
-`xz` and `zstd` are also benchmarked with 256 KB blocks.
-The decompression benchmark is timing how long it takes to `tar` the file tree
-into `/dev/null`.
-See `squashfs-benchmark.sh` for details.
-
-| Algorithm      | Compression ratio | Compression speed | Decompression speed |
-|----------------|-------------------|-------------------|---------------------|
-| gzip           | 2.92              |   15 MB/s         | 128 MB/s            |
-| lzo            | 2.64              |  9.5 MB/s         | 217 MB/s            |
-| lz4            | 2.12              |   94 MB/s         | 218 MB/s            |
-| xz             | 3.43              |  5.5 MB/s         |  35 MB/s            |
-| xz 256 KB      | 3.53              |  5.4 MB/s         |  40 MB/s            |
-| zstd 1         | 2.71              |   96 MB/s         | 210 MB/s            |
-| zstd 5         | 2.93              |   69 MB/s         | 198 MB/s            |
-| zstd 10        | 3.01              |   41 MB/s         | 225 MB/s            |
-| zstd 15        | 3.13              | 11.4 MB/s         | 224 MB/s            |
-| zstd 16 256 KB | 3.24              |  8.1 MB/s         | 210 MB/s            |
+1. `cd` into this directory.
+2. Run `make libzstd` and read the output. Make sure that all the diffs printed and changes made by the script are correct.
+3. Run `make test` and ensure that it passes.
+4. Import zstd into the Linux Kernel `make import LINUX=/path/to/linux/repo`
+5. Inspect the diff for sanity.
+6. Check the Linux Kernel history for zstd. If any patches were made to the kernel version of zstd, but not to upstream zstd, then port them upstream if necessary.
+7. Test the diff. Benchmark if necessary. Make sure to test multiple architectures: At least x86, i386, and arm.
+8. Submit the patch to the LKML.
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+
+/*
+ * This file includes every .c file needed for decompression.
+ * It is used by lib/decompress_unzstd.c to include the decompression
+ * source into the translation-unit, so it can be used for kernel
+ * decompression.
+ */
+
+#include "common/debug.c"
+#include "common/entropy_common.c"
+#include "common/error_private.c"
+#include "common/fse_decompress.c"
+#include "common/zstd_common.c"
+#include "decompress/huf_decompress.c"
+#include "decompress/zstd_ddict.c"
+#include "decompress/zstd_decompress.c"
+#include "decompress/zstd_decompress_block.c"
+#include "zstd_decompress_module.c"
@@ -1,432 +0,0 @@
-/*
- * Copyright (c) 2016-present, Facebook, Inc.
- * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License v2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
- * General Public License for more details.
- */
-#include <linux/bio.h>
-#include <linux/err.h>
-#include <linux/init.h>
-#include <linux/kernel.h>
-#include <linux/mm.h>
-#include <linux/pagemap.h>
-#include <linux/refcount.h>
-#include <linux/sched.h>
-#include <linux/slab.h>
-#include <linux/zstd.h>
-#include "compression.h"
-
-#define ZSTD_BTRFS_MAX_WINDOWLOG 17
-#define ZSTD_BTRFS_MAX_INPUT (1 << ZSTD_BTRFS_MAX_WINDOWLOG)
-#define ZSTD_BTRFS_DEFAULT_LEVEL 3
-
-static ZSTD_parameters zstd_get_btrfs_parameters(size_t src_len)
-{
-	ZSTD_parameters params = ZSTD_getParams(ZSTD_BTRFS_DEFAULT_LEVEL,
-						src_len, 0);
-
-	if (params.cParams.windowLog > ZSTD_BTRFS_MAX_WINDOWLOG)
-		params.cParams.windowLog = ZSTD_BTRFS_MAX_WINDOWLOG;
-	WARN_ON(src_len > ZSTD_BTRFS_MAX_INPUT);
-	return params;
-}
-
-struct workspace {
-	void *mem;
-	size_t size;
-	char *buf;
-	struct list_head list;
-};
-
-static void zstd_free_workspace(struct list_head *ws)
-{
-	struct workspace *workspace = list_entry(ws, struct workspace, list);
-
-	kvfree(workspace->mem);
-	kfree(workspace->buf);
-	kfree(workspace);
-}
-
-static struct list_head *zstd_alloc_workspace(void)
-{
-	ZSTD_parameters params =
-			zstd_get_btrfs_parameters(ZSTD_BTRFS_MAX_INPUT);
-	struct workspace *workspace;
-
-	workspace = kzalloc(sizeof(*workspace), GFP_KERNEL);
-	if (!workspace)
-		return ERR_PTR(-ENOMEM);
-
-	workspace->size = max_t(size_t,
-			ZSTD_CStreamWorkspaceBound(params.cParams),
-			ZSTD_DStreamWorkspaceBound(ZSTD_BTRFS_MAX_INPUT));
-	workspace->mem = kvmalloc(workspace->size, GFP_KERNEL);
-	workspace->buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
-	if (!workspace->mem || !workspace->buf)
-		goto fail;
-
-	INIT_LIST_HEAD(&workspace->list);
-
-	return &workspace->list;
-fail:
-	zstd_free_workspace(&workspace->list);
-	return ERR_PTR(-ENOMEM);
-}
-
-static int zstd_compress_pages(struct list_head *ws,
-		struct address_space *mapping,
-		u64 start,
-		struct page **pages,
-		unsigned long *out_pages,
-		unsigned long *total_in,
-		unsigned long *total_out)
-{
-	struct workspace *workspace = list_entry(ws, struct workspace, list);
-	ZSTD_CStream *stream;
-	int ret = 0;
-	int nr_pages = 0;
-	struct page *in_page = NULL;  /* The current page to read */
-	struct page *out_page = NULL; /* The current page to write to */
-	ZSTD_inBuffer in_buf = { NULL, 0, 0 };
-	ZSTD_outBuffer out_buf = { NULL, 0, 0 };
-	unsigned long tot_in = 0;
-	unsigned long tot_out = 0;
-	unsigned long len = *total_out;
-	const unsigned long nr_dest_pages = *out_pages;
-	unsigned long max_out = nr_dest_pages * PAGE_SIZE;
-	ZSTD_parameters params = zstd_get_btrfs_parameters(len);
-
-	*out_pages = 0;
-	*total_out = 0;
-	*total_in = 0;
-
-	/* Initialize the stream */
-	stream = ZSTD_initCStream(params, len, workspace->mem,
-			workspace->size);
-	if (!stream) {
-		pr_warn("BTRFS: ZSTD_initCStream failed\n");
-		ret = -EIO;
-		goto out;
-	}
-
-	/* map in the first page of input data */
-	in_page = find_get_page(mapping, start >> PAGE_SHIFT);
-	in_buf.src = kmap(in_page);
-	in_buf.pos = 0;
-	in_buf.size = min_t(size_t, len, PAGE_SIZE);
-
-
-	/* Allocate and map in the output buffer */
-	out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
-	if (out_page == NULL) {
-		ret = -ENOMEM;
-		goto out;
-	}
-	pages[nr_pages++] = out_page;
-	out_buf.dst = kmap(out_page);
-	out_buf.pos = 0;
-	out_buf.size = min_t(size_t, max_out, PAGE_SIZE);
-
-	while (1) {
-		size_t ret2;
-
-		ret2 = ZSTD_compressStream(stream, &out_buf, &in_buf);
-		if (ZSTD_isError(ret2)) {
-			pr_debug("BTRFS: ZSTD_compressStream returned %d\n",
-					ZSTD_getErrorCode(ret2));
-			ret = -EIO;
-			goto out;
-		}
-
-		/* Check to see if we are making it bigger */
-		if (tot_in + in_buf.pos > 8192 &&
-				tot_in + in_buf.pos <
-				tot_out + out_buf.pos) {
-			ret = -E2BIG;
-			goto out;
-		}
-
-		/* We've reached the end of our output range */
-		if (out_buf.pos >= max_out) {
-			tot_out += out_buf.pos;
-			ret = -E2BIG;
-			goto out;
-		}
-
-		/* Check if we need more output space */
-		if (out_buf.pos == out_buf.size) {
-			tot_out += PAGE_SIZE;
-			max_out -= PAGE_SIZE;
-			kunmap(out_page);
-			if (nr_pages == nr_dest_pages) {
-				out_page = NULL;
-				ret = -E2BIG;
-				goto out;
-			}
-			out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
-			if (out_page == NULL) {
-				ret = -ENOMEM;
-				goto out;
-			}
-			pages[nr_pages++] = out_page;
-			out_buf.dst = kmap(out_page);
-			out_buf.pos = 0;
-			out_buf.size = min_t(size_t, max_out, PAGE_SIZE);
-		}
-
-		/* We've reached the end of the input */
-		if (in_buf.pos >= len) {
-			tot_in += in_buf.pos;
-			break;
-		}
-
-		/* Check if we need more input */
-		if (in_buf.pos == in_buf.size) {
-			tot_in += PAGE_SIZE;
-			kunmap(in_page);
-			put_page(in_page);
-
-			start += PAGE_SIZE;
-			len -= PAGE_SIZE;
-			in_page = find_get_page(mapping, start >> PAGE_SHIFT);
-			in_buf.src = kmap(in_page);
-			in_buf.pos = 0;
-			in_buf.size = min_t(size_t, len, PAGE_SIZE);
-		}
-	}
-	while (1) {
-		size_t ret2;
-
-		ret2 = ZSTD_endStream(stream, &out_buf);
-		if (ZSTD_isError(ret2)) {
-			pr_debug("BTRFS: ZSTD_endStream returned %d\n",
-					ZSTD_getErrorCode(ret2));
-			ret = -EIO;
-			goto out;
-		}
-		if (ret2 == 0) {
-			tot_out += out_buf.pos;
-			break;
-		}
-		if (out_buf.pos >= max_out) {
-			tot_out += out_buf.pos;
-			ret = -E2BIG;
-			goto out;
-		}
-
-		tot_out += PAGE_SIZE;
-		max_out -= PAGE_SIZE;
-		kunmap(out_page);
-		if (nr_pages == nr_dest_pages) {
-			out_page = NULL;
-			ret = -E2BIG;
-			goto out;
-		}
-		out_page = alloc_page(GFP_NOFS | __GFP_HIGHMEM);
-		if (out_page == NULL) {
-			ret = -ENOMEM;
-			goto out;
-		}
-		pages[nr_pages++] = out_page;
-		out_buf.dst = kmap(out_page);
-		out_buf.pos = 0;
-		out_buf.size = min_t(size_t, max_out, PAGE_SIZE);
-	}
-
-	if (tot_out >= tot_in) {
-		ret = -E2BIG;
-		goto out;
-	}
-
-	ret = 0;
-	*total_in = tot_in;
-	*total_out = tot_out;
-out:
-	*out_pages = nr_pages;
-	/* Cleanup */
-	if (in_page) {
-		kunmap(in_page);
-		put_page(in_page);
-	}
-	if (out_page)
-		kunmap(out_page);
-	return ret;
-}
-
-static int zstd_decompress_bio(struct list_head *ws, struct compressed_bio *cb)
-{
-	struct workspace *workspace = list_entry(ws, struct workspace, list);
-	struct page **pages_in = cb->compressed_pages;
-	u64 disk_start = cb->start;
-	struct bio *orig_bio = cb->orig_bio;
-	size_t srclen = cb->compressed_len;
-	ZSTD_DStream *stream;
-	int ret = 0;
-	unsigned long page_in_index = 0;
-	unsigned long total_pages_in = DIV_ROUND_UP(srclen, PAGE_SIZE);
-	unsigned long buf_start;
-	unsigned long total_out = 0;
-	ZSTD_inBuffer in_buf = { NULL, 0, 0 };
-	ZSTD_outBuffer out_buf = { NULL, 0, 0 };
-
-	stream = ZSTD_initDStream(
-			ZSTD_BTRFS_MAX_INPUT, workspace->mem, workspace->size);
-	if (!stream) {
-		pr_debug("BTRFS: ZSTD_initDStream failed\n");
-		ret = -EIO;
-		goto done;
-	}
-
-	in_buf.src = kmap(pages_in[page_in_index]);
-	in_buf.pos = 0;
-	in_buf.size = min_t(size_t, srclen, PAGE_SIZE);
-
-	out_buf.dst = workspace->buf;
-	out_buf.pos = 0;
-	out_buf.size = PAGE_SIZE;
-
-	while (1) {
-		size_t ret2;
-
-		ret2 = ZSTD_decompressStream(stream, &out_buf, &in_buf);
-		if (ZSTD_isError(ret2)) {
-			pr_debug("BTRFS: ZSTD_decompressStream returned %d\n",
-					ZSTD_getErrorCode(ret2));
-			ret = -EIO;
-			goto done;
-		}
-		buf_start = total_out;
-		total_out += out_buf.pos;
-		out_buf.pos = 0;
-
-		ret = btrfs_decompress_buf2page(out_buf.dst, buf_start,
-				total_out, disk_start, orig_bio);
-		if (ret == 0)
-			break;
-
-		if (in_buf.pos >= srclen)
-			break;
-
-		/* Check if we've hit the end of a frame */
-		if (ret2 == 0)
-			break;
-
-		if (in_buf.pos == in_buf.size) {
-			kunmap(pages_in[page_in_index++]);
-			if (page_in_index >= total_pages_in) {
-				in_buf.src = NULL;
-				ret = -EIO;
-				goto done;
-			}
-			srclen -= PAGE_SIZE;
-			in_buf.src = kmap(pages_in[page_in_index]);
-			in_buf.pos = 0;
-			in_buf.size = min_t(size_t, srclen, PAGE_SIZE);
-		}
-	}
-	ret = 0;
-	zero_fill_bio(orig_bio);
-done:
-	if (in_buf.src)
-		kunmap(pages_in[page_in_index]);
-	return ret;
-}
-
-static int zstd_decompress(struct list_head *ws, unsigned char *data_in,
-		struct page *dest_page,
-		unsigned long start_byte,
-		size_t srclen, size_t destlen)
-{
-	struct workspace *workspace = list_entry(ws, struct workspace, list);
-	ZSTD_DStream *stream;
-	int ret = 0;
-	size_t ret2;
-	ZSTD_inBuffer in_buf = { NULL, 0, 0 };
-	ZSTD_outBuffer out_buf = { NULL, 0, 0 };
-	unsigned long total_out = 0;
-	unsigned long pg_offset = 0;
-	char *kaddr;
-
-	stream = ZSTD_initDStream(
-			ZSTD_BTRFS_MAX_INPUT, workspace->mem, workspace->size);
-	if (!stream) {
-		pr_warn("BTRFS: ZSTD_initDStream failed\n");
-		ret = -EIO;
-		goto finish;
-	}
-
-	destlen = min_t(size_t, destlen, PAGE_SIZE);
-
-	in_buf.src = data_in;
-	in_buf.pos = 0;
-	in_buf.size = srclen;
-
-	out_buf.dst = workspace->buf;
-	out_buf.pos = 0;
-	out_buf.size = PAGE_SIZE;
-
-	ret2 = 1;
-	while (pg_offset < destlen && in_buf.pos < in_buf.size) {
-		unsigned long buf_start;
-		unsigned long buf_offset;
-		unsigned long bytes;
-
-		/* Check if the frame is over and we still need more input */
-		if (ret2 == 0) {
-			pr_debug("BTRFS: ZSTD_decompressStream ended early\n");
-			ret = -EIO;
-			goto finish;
-		}
-		ret2 = ZSTD_decompressStream(stream, &out_buf, &in_buf);
-		if (ZSTD_isError(ret2)) {
-			pr_debug("BTRFS: ZSTD_decompressStream returned %d\n",
-					ZSTD_getErrorCode(ret2));
-			ret = -EIO;
-			goto finish;
-		}
-
-		buf_start = total_out;
-		total_out += out_buf.pos;
-		out_buf.pos = 0;
-
-		if (total_out <= start_byte)
-			continue;
-
-		if (total_out > start_byte && buf_start < start_byte)
-			buf_offset = start_byte - buf_start;
-		else
-			buf_offset = 0;
-
-		bytes = min_t(unsigned long, destlen - pg_offset,
-				out_buf.size - buf_offset);
-
-		kaddr = kmap_atomic(dest_page);
-		memcpy(kaddr + pg_offset, out_buf.dst + buf_offset, bytes);
-		kunmap_atomic(kaddr);
-
-		pg_offset += bytes;
-	}
-	ret = 0;
-finish:
-	if (pg_offset < destlen) {
-		kaddr = kmap_atomic(dest_page);
-		memset(kaddr + pg_offset, 0, destlen - pg_offset);
-		kunmap_atomic(kaddr);
-	}
-	return ret;
-}
-
-const struct btrfs_compress_op btrfs_zstd_compress = {
-	.alloc_workspace = zstd_alloc_workspace,
-	.free_workspace = zstd_free_workspace,
-	.compress_pages = zstd_compress_pages,
-	.decompress_bio = zstd_decompress_bio,
-	.decompress = zstd_decompress,
-};
@@ -1,151 +0,0 @@
-/*
- * Squashfs - a compressed read only filesystem for Linux
- *
- * Copyright (c) 2016-present, Facebook, Inc.
- * All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License
- * as published by the Free Software Foundation; either version 2,
- * or (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * zstd_wrapper.c
- */
-
-#include <linux/mutex.h>
-#include <linux/buffer_head.h>
-#include <linux/slab.h>
-#include <linux/zstd.h>
-#include <linux/vmalloc.h>
-
-#include "squashfs_fs.h"
-#include "squashfs_fs_sb.h"
-#include "squashfs.h"
-#include "decompressor.h"
-#include "page_actor.h"
-
-struct workspace {
-	void *mem;
-	size_t mem_size;
-	size_t window_size;
-};
-
-static void *zstd_init(struct squashfs_sb_info *msblk, void *buff)
-{
-	struct workspace *wksp = kmalloc(sizeof(*wksp), GFP_KERNEL);
-
-	if (wksp == NULL)
-		goto failed;
-	wksp->window_size = max_t(size_t,
-			msblk->block_size, SQUASHFS_METADATA_SIZE);
-	wksp->mem_size = ZSTD_DStreamWorkspaceBound(wksp->window_size);
-	wksp->mem = vmalloc(wksp->mem_size);
-	if (wksp->mem == NULL)
-		goto failed;
-
-	return wksp;
-
-failed:
-	ERROR("Failed to allocate zstd workspace\n");
-	kfree(wksp);
-	return ERR_PTR(-ENOMEM);
-}
-
-
-static void zstd_free(void *strm)
-{
-	struct workspace *wksp = strm;
-
-	if (wksp)
-		vfree(wksp->mem);
-	kfree(wksp);
-}
-
-
-static int zstd_uncompress(struct squashfs_sb_info *msblk, void *strm,
-	struct buffer_head **bh, int b, int offset, int length,
-	struct squashfs_page_actor *output)
-{
-	struct workspace *wksp = strm;
-	ZSTD_DStream *stream;
-	size_t total_out = 0;
-	size_t zstd_err;
-	int k = 0;
-	ZSTD_inBuffer in_buf = { NULL, 0, 0 };
-	ZSTD_outBuffer out_buf = { NULL, 0, 0 };
-
-	stream = ZSTD_initDStream(wksp->window_size, wksp->mem, wksp->mem_size);
-
-	if (!stream) {
-		ERROR("Failed to initialize zstd decompressor\n");
-		goto out;
-	}
-
-	out_buf.size = PAGE_SIZE;
-	out_buf.dst = squashfs_first_page(output);
-
-	do {
-		if (in_buf.pos == in_buf.size && k < b) {
-			int avail = min(length, msblk->devblksize - offset);
-
-			length -= avail;
-			in_buf.src = bh[k]->b_data + offset;
-			in_buf.size = avail;
-			in_buf.pos = 0;
-			offset = 0;
-		}
-
-		if (out_buf.pos == out_buf.size) {
-			out_buf.dst = squashfs_next_page(output);
-			if (out_buf.dst == NULL) {
-				/* Shouldn't run out of pages
-				 * before stream is done.
-				 */
-				squashfs_finish_page(output);
-				goto out;
-			}
-			out_buf.pos = 0;
-			out_buf.size = PAGE_SIZE;
-		}
-
-		total_out -= out_buf.pos;
-		zstd_err = ZSTD_decompressStream(stream, &out_buf, &in_buf);
-		total_out += out_buf.pos; /* add the additional data produced */
-
-		if (in_buf.pos == in_buf.size && k < b)
-			put_bh(bh[k++]);
-	} while (zstd_err != 0 && !ZSTD_isError(zstd_err));
-
-	squashfs_finish_page(output);
-
-	if (ZSTD_isError(zstd_err)) {
-		ERROR("zstd decompression error: %d\n",
-				(int)ZSTD_getErrorCode(zstd_err));
-		goto out;
-	}
-
-	if (k < b)
-		goto out;
-
-	return (int)total_out;
-
-out:
-	for (; k < b; k++)
-		put_bh(bh[k]);
-
-	return -EIO;
-}
-
-const struct squashfs_decompressor squashfs_zstd_comp_ops = {
-	.init = zstd_init,
-	.free = zstd_free,
-	.decompress = zstd_uncompress,
-	.id = ZSTD_COMPRESSION,
-	.name = "zstd",
-	.supported = 1
-};
@@ -1,236 +0,0 @@
-/*
- * xxHash - Extremely Fast Hash algorithm
- * Copyright (C) 2012-2016, Yann Collet.
- *
- * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *   * Redistributions of source code must retain the above copyright
- *     notice, this list of conditions and the following disclaimer.
- *   * Redistributions in binary form must reproduce the above
- *     copyright notice, this list of conditions and the following disclaimer
- *     in the documentation and/or other materials provided with the
- *     distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- *
- * You can contact the author at:
- * - xxHash homepage: http://cyan4973.github.io/xxHash/
- * - xxHash source repository: https://github.com/Cyan4973/xxHash
- */
-
-/*
- * Notice extracted from xxHash homepage:
- *
- * xxHash is an extremely fast Hash algorithm, running at RAM speed limits.
- * It also successfully passes all tests from the SMHasher suite.
- *
- * Comparison (single thread, Windows Seven 32 bits, using SMHasher on a Core 2
- * Duo @3GHz)
- *
- * Name            Speed       Q.Score   Author
- * xxHash          5.4 GB/s     10
- * CrapWow         3.2 GB/s      2       Andrew
- * MumurHash 3a    2.7 GB/s     10       Austin Appleby
- * SpookyHash      2.0 GB/s     10       Bob Jenkins
- * SBox            1.4 GB/s      9       Bret Mulvey
- * Lookup3         1.2 GB/s      9       Bob Jenkins
- * SuperFastHash   1.2 GB/s      1       Paul Hsieh
- * CityHash64      1.05 GB/s    10       Pike & Alakuijala
- * FNV             0.55 GB/s     5       Fowler, Noll, Vo
- * CRC32           0.43 GB/s     9
- * MD5-32          0.33 GB/s    10       Ronald L. Rivest
- * SHA1-32         0.28 GB/s    10
- *
- * Q.Score is a measure of quality of the hash function.
- * It depends on successfully passing SMHasher test set.
- * 10 is a perfect score.
- *
- * A 64-bits version, named xxh64 offers much better speed,
- * but for 64-bits applications only.
- * Name     Speed on 64 bits    Speed on 32 bits
- * xxh64       13.8 GB/s            1.9 GB/s
- * xxh32        6.8 GB/s            6.0 GB/s
- */
-
-#ifndef XXHASH_H
-#define XXHASH_H
-
-#include <linux/types.h>
-
-/*-****************************
- * Simple Hash Functions
- *****************************/
-
-/**
- * xxh32() - calculate the 32-bit hash of the input with a given seed.
- *
- * @input:  The data to hash.
- * @length: The length of the data to hash.
- * @seed:   The seed can be used to alter the result predictably.
- *
- * Speed on Core 2 Duo @ 3 GHz (single thread, SMHasher benchmark) : 5.4 GB/s
- *
- * Return:  The 32-bit hash of the data.
- */
-uint32_t xxh32(const void *input, size_t length, uint32_t seed);
-
-/**
- * xxh64() - calculate the 64-bit hash of the input with a given seed.
- *
- * @input:  The data to hash.
- * @length: The length of the data to hash.
- * @seed:   The seed can be used to alter the result predictably.
- *
- * This function runs 2x faster on 64-bit systems, but slower on 32-bit systems.
- *
- * Return:  The 64-bit hash of the data.
- */
-uint64_t xxh64(const void *input, size_t length, uint64_t seed);
-
-/*-****************************
- * Streaming Hash Functions
- *****************************/
-
-/*
- * These definitions are only meant to allow allocation of XXH state
- * statically, on stack, or in a struct for example.
- * Do not use members directly.
- */
-
-/**
- * struct xxh32_state - private xxh32 state, do not use members directly
- */
-struct xxh32_state {
-	uint32_t total_len_32;
-	uint32_t large_len;
-	uint32_t v1;
-	uint32_t v2;
-	uint32_t v3;
-	uint32_t v4;
-	uint32_t mem32[4];
-	uint32_t memsize;
-};
-
-/**
- * struct xxh32_state - private xxh64 state, do not use members directly
- */
-struct xxh64_state {
-	uint64_t total_len;
-	uint64_t v1;
-	uint64_t v2;
-	uint64_t v3;
-	uint64_t v4;
-	uint64_t mem64[4];
-	uint32_t memsize;
-};
-
-/**
- * xxh32_reset() - reset the xxh32 state to start a new hashing operation
- *
- * @state: The xxh32 state to reset.
- * @seed:  Initialize the hash state with this seed.
- *
- * Call this function on any xxh32_state to prepare for a new hashing operation.
- */
-void xxh32_reset(struct xxh32_state *state, uint32_t seed);
-
-/**
- * xxh32_update() - hash the data given and update the xxh32 state
- *
- * @state:  The xxh32 state to update.
- * @input:  The data to hash.
- * @length: The length of the data to hash.
- *
- * After calling xxh32_reset() call xxh32_update() as many times as necessary.
- *
- * Return:  Zero on success, otherwise an error code.
- */
-int xxh32_update(struct xxh32_state *state, const void *input, size_t length);
-
-/**
- * xxh32_digest() - produce the current xxh32 hash
- *
- * @state: Produce the current xxh32 hash of this state.
- *
- * A hash value can be produced at any time. It is still possible to continue
- * inserting input into the hash state after a call to xxh32_digest(), and
- * generate new hashes later on, by calling xxh32_digest() again.
- *
- * Return: The xxh32 hash stored in the state.
- */
-uint32_t xxh32_digest(const struct xxh32_state *state);
-
-/**
- * xxh64_reset() - reset the xxh64 state to start a new hashing operation
- *
- * @state: The xxh64 state to reset.
- * @seed:  Initialize the hash state with this seed.
- */
-void xxh64_reset(struct xxh64_state *state, uint64_t seed);
-
-/**
- * xxh64_update() - hash the data given and update the xxh64 state
- * @state:  The xxh64 state to update.
- * @input:  The data to hash.
- * @length: The length of the data to hash.
- *
- * After calling xxh64_reset() call xxh64_update() as many times as necessary.
- *
- * Return:  Zero on success, otherwise an error code.
- */
-int xxh64_update(struct xxh64_state *state, const void *input, size_t length);
-
-/**
- * xxh64_digest() - produce the current xxh64 hash
- *
- * @state: Produce the current xxh64 hash of this state.
- *
- * A hash value can be produced at any time. It is still possible to continue
- * inserting input into the hash state after a call to xxh64_digest(), and
- * generate new hashes later on, by calling xxh64_digest() again.
- *
- * Return: The xxh64 hash stored in the state.
- */
-uint64_t xxh64_digest(const struct xxh64_state *state);
-
-/*-**************************
- * Utils
- ***************************/
-
-/**
- * xxh32_copy_state() - copy the source state into the destination state
- *
- * @src: The source xxh32 state.
- * @dst: The destination xxh32 state.
- */
-void xxh32_copy_state(struct xxh32_state *dst, const struct xxh32_state *src);
-
-/**
- * xxh64_copy_state() - copy the source state into the destination state
- *
- * @src: The source xxh64 state.
- * @dst: The destination xxh64 state.
- */
-void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src);
-
-#endif /* XXHASH_H */
@@ -1,110 +0,0 @@
-#!/bin/sh
-set -e
-
-# Constants
-SED_COMMANDS="commands.tmp"
-CLANG_FORMAT="clang-format-3.9"
-INCLUDE='include/linux/'
-LIB='lib/zstd/'
-SPACES='    '
-TAB=$'\t'
-TMP="replacements.tmp"
-
-function prompt() {
-  while true; do
-    read -p "$1 [Y/n]" yn
-    case $yn in
-        '' ) yes='yes'; break;;
-        [Yy]* ) yes='yes'; break;;
-        [Nn]* ) yes=''; break;;
-        * ) echo "Please answer yes or no.";;
-    esac
-done
-}
-
-function check_not_present() {
-  grep "$1" $INCLUDE*.h ${LIB}*.{h,c} && exit 1 || true
-}
-
-function check_not_present_in_file() {
-  grep "$1" "$2" && exit 1 || true
-}
-
-function check_present_in_file() {
-  grep "$1" "$2" > /dev/null 2> /dev/null || exit 1
-}
-
-echo "Files: " $INCLUDE*.h $LIB*.{h,c}
-
-prompt "Do you wish to replace 4 spaces with a tab?"
-if [ ! -z "$yes" ]
-then
-  # Check files for existing tabs
-  grep "$TAB" $INCLUDE*.h $LIB*.{h,c} && exit 1 || true
-  # Replace the first tab on every line
-  sed -i '' "s/^$SPACES/$TAB/" $INCLUDE*.h $LIB*.{h,c}
-
-  # Execute once and then execute as long as replacements are happening
-  more_work="yes"
-  while [ ! -z "$more_work" ]
-  do
-    rm -f $TMP
-    # Replaces $SPACES that directly follow a $TAB with a $TAB.
-    # $TMP will be non-empty if any replacements took place.
-    sed -i '' "s/$TAB$SPACES/$TAB$TAB/w $TMP" $INCLUDE*.h $LIB*.{h,c}
-    more_work=$(cat "$TMP")
-  done
-  rm -f $TMP
-fi
-
-prompt "Do you wish to replace '{   ' with a tab?"
-if [ ! -z "$yes" ]
-then
-  sed -i '' "s/$TAB{   /$TAB{$TAB/g" $INCLUDE*.h $LIB*.{h,c}
-fi
-
-rm -f $SED_COMMANDS
-cat > $SED_COMMANDS <<EOF
-s/current/curr/g
-s/MEM_STATIC/ZSTD_STATIC/g
-s/MEM_check/ZSTD_check/g
-s/MEM_32bits/ZSTD_32bits/g
-s/MEM_64bits/ZSTD_64bits/g
-s/MEM_LITTLE_ENDIAN/ZSTD_LITTLE_ENDIAN/g
-s/MEM_isLittleEndian/ZSTD_isLittleEndian/g
-s/MEM_read/ZSTD_read/g
-s/MEM_write/ZSTD_write/g
-EOF
-
-prompt "Do you wish to run these sed commands $(cat $SED_COMMANDS)?"
-if [ ! -z "$yes" ]
-then
-  sed -i '' -f $SED_COMMANDS $LIB*.{h,c}
-fi
-rm -f $SED_COMMANDS
-
-prompt "Do you wish to clang-format $LIB*.{h,c}?"
-if [ ! -z "$yes" ]
-then
-  $CLANG_FORMAT -i ${LIB}*.{h,c}
-fi
-
-prompt "Do you wish to run some checks?"
-if [ ! -z "$yes" ]
-then
-  check_present_in_file ZSTD_STATIC_ASSERT ${LIB}zstd_internal.h
-  check_not_present_in_file STATIC_ASSERT ${LIB}mem.h
-  check_not_present_in_file "#define ZSTD_STATIC_ASSERT" ${LIB}compress.c
-  check_not_present MEM_STATIC
-  check_not_present FSE_COMMONDEFS_ONLY
-  check_not_present "#if 0"
-  check_not_present "#if 1"
-  check_not_present _MSC_VER
-  check_not_present __cplusplus
-  check_not_present __STDC_VERSION__
-  check_not_present __VMS
-  check_not_present __GNUC__
-  check_not_present __INTEL_COMPILER
-  check_not_present FORCE_MEMORY_ACCESS
-  check_not_present STATIC_LINKING_ONLY
-fi
@@ -1,19 +0,0 @@
-diff --git a/lib/Kconfig b/lib/Kconfig
-index b6009d7..f00ddab 100644
--- a/lib/Kconfig
-+++ b/lib/Kconfig
-@@ -241,6 +241,14 @@ config LZ4HC_COMPRESS
- config LZ4_DECOMPRESS
- 	tristate
- 
-+config ZSTD_COMPRESS
-+	select XXHASH
-+	tristate
-+
-+config ZSTD_DECOMPRESS
-+	select XXHASH
-+	tristate
-+
- source "lib/xz/Kconfig"
- 
- #
@@ -1,13 +0,0 @@
-diff --git a/lib/Makefile b/lib/Makefile
-index e16f94a..0cfd529 100644
--- a/lib/Makefile
-+++ b/lib/Makefile
-@@ -115,6 +115,8 @@ obj-$(CONFIG_LZO_DECOMPRESS) += lzo/
- obj-$(CONFIG_LZ4_COMPRESS) += lz4/
- obj-$(CONFIG_LZ4HC_COMPRESS) += lz4/
- obj-$(CONFIG_LZ4_DECOMPRESS) += lz4/
-+obj-$(CONFIG_ZSTD_COMPRESS) += zstd/
-+obj-$(CONFIG_ZSTD_DECOMPRESS) += zstd/
- obj-$(CONFIG_XZ_DEC) += xz/
- obj-$(CONFIG_RAID6_PQ) += raid6/
- 
@@ -1,11 +0,0 @@
-BasedOnStyle: LLVM
-IndentWidth: 8
-UseTab: Always
-BreakBeforeBraces: Linux
-AllowShortIfStatementsOnASingleLine: false
-IndentCaseLabels: false
-
-ColumnLimit: 160
-AlignEscapedNewlinesLeft: true
-ReflowComments: true
-AllowShortCaseLabelsOnASingleLine: true
@@ -1,18 +0,0 @@
-obj-$(CONFIG_ZSTD_COMPRESS) += zstd_compress.o
-obj-$(CONFIG_ZSTD_DECOMPRESS) += zstd_decompress.o
-
-ccflags-y += -O3
-
-# Object files unique to zstd_compress and zstd_decompress
-zstd_compress-y := fse_compress.o huf_compress.o compress.o
-zstd_decompress-y := huf_decompress.o decompress.o
-
-# These object files are shared between the modules.
-# Always add them to zstd_compress.
-# Unless both zstd_compress and zstd_decompress are built in
-# then also add them to zstd_decompress.
-zstd_compress-y += entropy_common.o fse_decompress.o zstd_common.o
-
-ifneq ($(CONFIG_ZSTD_COMPRESS)$(CONFIG_ZSTD_DECOMPRESS),yy)
-	zstd_decompress-y += entropy_common.o fse_decompress.o zstd_common.o
-endif
@@ -1,374 +0,0 @@
-/*
- * bitstream
- * Part of FSE library
- * header file (to include)
- * Copyright (C) 2013-2016, Yann Collet.
- *
- * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *   * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *   * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- *
- * You can contact the author at :
- * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy
- */
-#ifndef BITSTREAM_H_MODULE
-#define BITSTREAM_H_MODULE
-
-/*
-*  This API consists of small unitary functions, which must be inlined for best performance.
-*  Since link-time-optimization is not available for all compilers,
-*  these functions are defined into a .h to be included.
-*/
-
-/*-****************************************
-*  Dependencies
-******************************************/
-#include "error_private.h" /* error codes and messages */
-#include "mem.h"	   /* unaligned access routines */
-
-/*=========================================
-*  Target specific
-=========================================*/
-#define STREAM_ACCUMULATOR_MIN_32 25
-#define STREAM_ACCUMULATOR_MIN_64 57
-#define STREAM_ACCUMULATOR_MIN ((U32)(ZSTD_32bits() ? STREAM_ACCUMULATOR_MIN_32 : STREAM_ACCUMULATOR_MIN_64))
-
-/*-******************************************
-*  bitStream encoding API (write forward)
-********************************************/
-/* bitStream can mix input from multiple sources.
-*  A critical property of these streams is that they encode and decode in **reverse** direction.
-*  So the first bit sequence you add will be the last to be read, like a LIFO stack.
-*/
-typedef struct {
-	size_t bitContainer;
-	int bitPos;
-	char *startPtr;
-	char *ptr;
-	char *endPtr;
-} BIT_CStream_t;
-
-ZSTD_STATIC size_t BIT_initCStream(BIT_CStream_t *bitC, void *dstBuffer, size_t dstCapacity);
-ZSTD_STATIC void BIT_addBits(BIT_CStream_t *bitC, size_t value, unsigned nbBits);
-ZSTD_STATIC void BIT_flushBits(BIT_CStream_t *bitC);
-ZSTD_STATIC size_t BIT_closeCStream(BIT_CStream_t *bitC);
-
-/* Start with initCStream, providing the size of buffer to write into.
-*  bitStream will never write outside of this buffer.
-*  `dstCapacity` must be >= sizeof(bitD->bitContainer), otherwise @return will be an error code.
-*
-*  bits are first added to a local register.
-*  Local register is size_t, hence 64-bits on 64-bits systems, or 32-bits on 32-bits systems.
-*  Writing data into memory is an explicit operation, performed by the flushBits function.
-*  Hence keep track how many bits are potentially stored into local register to avoid register overflow.
-*  After a flushBits, a maximum of 7 bits might still be stored into local register.
-*
-*  Avoid storing elements of more than 24 bits if you want compatibility with 32-bits bitstream readers.
-*
-*  Last operation is to close the bitStream.
-*  The function returns the final size of CStream in bytes.
-*  If data couldn't fit into `dstBuffer`, it will return a 0 ( == not storable)
-*/
-
-/*-********************************************
-*  bitStream decoding API (read backward)
-**********************************************/
-typedef struct {
-	size_t bitContainer;
-	unsigned bitsConsumed;
-	const char *ptr;
-	const char *start;
-} BIT_DStream_t;
-
-typedef enum {
-	BIT_DStream_unfinished = 0,
-	BIT_DStream_endOfBuffer = 1,
-	BIT_DStream_completed = 2,
-	BIT_DStream_overflow = 3
-} BIT_DStream_status; /* result of BIT_reloadDStream() */
-/* 1,2,4,8 would be better for bitmap combinations, but slows down performance a bit ... :( */
-
-ZSTD_STATIC size_t BIT_initDStream(BIT_DStream_t *bitD, const void *srcBuffer, size_t srcSize);
-ZSTD_STATIC size_t BIT_readBits(BIT_DStream_t *bitD, unsigned nbBits);
-ZSTD_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t *bitD);
-ZSTD_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t *bitD);
-
-/* Start by invoking BIT_initDStream().
-*  A chunk of the bitStream is then stored into a local register.
-*  Local register size is 64-bits on 64-bits systems, 32-bits on 32-bits systems (size_t).
-*  You can then retrieve bitFields stored into the local register, **in reverse order**.
-*  Local register is explicitly reloaded from memory by the BIT_reloadDStream() method.
-*  A reload guarantee a minimum of ((8*sizeof(bitD->bitContainer))-7) bits when its result is BIT_DStream_unfinished.
-*  Otherwise, it can be less than that, so proceed accordingly.
-*  Checking if DStream has reached its end can be performed with BIT_endOfDStream().
-*/
-
-/*-****************************************
-*  unsafe API
-******************************************/
-ZSTD_STATIC void BIT_addBitsFast(BIT_CStream_t *bitC, size_t value, unsigned nbBits);
-/* faster, but works only if value is "clean", meaning all high bits above nbBits are 0 */
-
-ZSTD_STATIC void BIT_flushBitsFast(BIT_CStream_t *bitC);
-/* unsafe version; does not check buffer overflow */
-
-ZSTD_STATIC size_t BIT_readBitsFast(BIT_DStream_t *bitD, unsigned nbBits);
-/* faster, but works only if nbBits >= 1 */
-
-/*-**************************************************************
-*  Internal functions
-****************************************************************/
-ZSTD_STATIC unsigned BIT_highbit32(register U32 val) { return 31 - __builtin_clz(val); }
-
-/*=====    Local Constants   =====*/
-static const unsigned BIT_mask[] = {0,       1,       3,       7,	0xF,      0x1F,     0x3F,     0x7F,      0xFF,
-				    0x1FF,   0x3FF,   0x7FF,   0xFFF,    0x1FFF,   0x3FFF,   0x7FFF,   0xFFFF,    0x1FFFF,
-				    0x3FFFF, 0x7FFFF, 0xFFFFF, 0x1FFFFF, 0x3FFFFF, 0x7FFFFF, 0xFFFFFF, 0x1FFFFFF, 0x3FFFFFF}; /* up to 26 bits */
-
-/*-**************************************************************
-*  bitStream encoding
-****************************************************************/
-/*! BIT_initCStream() :
- *  `dstCapacity` must be > sizeof(void*)
- *  @return : 0 if success,
-			  otherwise an error code (can be tested using ERR_isError() ) */
-ZSTD_STATIC size_t BIT_initCStream(BIT_CStream_t *bitC, void *startPtr, size_t dstCapacity)
-{
-	bitC->bitContainer = 0;
-	bitC->bitPos = 0;
-	bitC->startPtr = (char *)startPtr;
-	bitC->ptr = bitC->startPtr;
-	bitC->endPtr = bitC->startPtr + dstCapacity - sizeof(bitC->ptr);
-	if (dstCapacity <= sizeof(bitC->ptr))
-		return ERROR(dstSize_tooSmall);
-	return 0;
-}
-
-/*! BIT_addBits() :
-	can add up to 26 bits into `bitC`.
-	Does not check for register overflow ! */
-ZSTD_STATIC void BIT_addBits(BIT_CStream_t *bitC, size_t value, unsigned nbBits)
-{
-	bitC->bitContainer |= (value & BIT_mask[nbBits]) << bitC->bitPos;
-	bitC->bitPos += nbBits;
-}
-
-/*! BIT_addBitsFast() :
- *  works only if `value` is _clean_, meaning all high bits above nbBits are 0 */
-ZSTD_STATIC void BIT_addBitsFast(BIT_CStream_t *bitC, size_t value, unsigned nbBits)
-{
-	bitC->bitContainer |= value << bitC->bitPos;
-	bitC->bitPos += nbBits;
-}
-
-/*! BIT_flushBitsFast() :
- *  unsafe version; does not check buffer overflow */
-ZSTD_STATIC void BIT_flushBitsFast(BIT_CStream_t *bitC)
-{
-	size_t const nbBytes = bitC->bitPos >> 3;
-	ZSTD_writeLEST(bitC->ptr, bitC->bitContainer);
-	bitC->ptr += nbBytes;
-	bitC->bitPos &= 7;
-	bitC->bitContainer >>= nbBytes * 8; /* if bitPos >= sizeof(bitContainer)*8 --> undefined behavior */
-}
-
-/*! BIT_flushBits() :
- *  safe version; check for buffer overflow, and prevents it.
- *  note : does not signal buffer overflow. This will be revealed later on using BIT_closeCStream() */
-ZSTD_STATIC void BIT_flushBits(BIT_CStream_t *bitC)
-{
-	size_t const nbBytes = bitC->bitPos >> 3;
-	ZSTD_writeLEST(bitC->ptr, bitC->bitContainer);
-	bitC->ptr += nbBytes;
-	if (bitC->ptr > bitC->endPtr)
-		bitC->ptr = bitC->endPtr;
-	bitC->bitPos &= 7;
-	bitC->bitContainer >>= nbBytes * 8; /* if bitPos >= sizeof(bitContainer)*8 --> undefined behavior */
-}
-
-/*! BIT_closeCStream() :
- *  @return : size of CStream, in bytes,
-			  or 0 if it could not fit into dstBuffer */
-ZSTD_STATIC size_t BIT_closeCStream(BIT_CStream_t *bitC)
-{
-	BIT_addBitsFast(bitC, 1, 1); /* endMark */
-	BIT_flushBits(bitC);
-
-	if (bitC->ptr >= bitC->endPtr)
-		return 0; /* doesn't fit within authorized budget : cancel */
-
-	return (bitC->ptr - bitC->startPtr) + (bitC->bitPos > 0);
-}
-
-/*-********************************************************
-* bitStream decoding
-**********************************************************/
-/*! BIT_initDStream() :
-*   Initialize a BIT_DStream_t.
-*   `bitD` : a pointer to an already allocated BIT_DStream_t structure.
-*   `srcSize` must be the *exact* size of the bitStream, in bytes.
-*   @return : size of stream (== srcSize) or an errorCode if a problem is detected
-*/
-ZSTD_STATIC size_t BIT_initDStream(BIT_DStream_t *bitD, const void *srcBuffer, size_t srcSize)
-{
-	if (srcSize < 1) {
-		memset(bitD, 0, sizeof(*bitD));
-		return ERROR(srcSize_wrong);
-	}
-
-	if (srcSize >= sizeof(bitD->bitContainer)) { /* normal case */
-		bitD->start = (const char *)srcBuffer;
-		bitD->ptr = (const char *)srcBuffer + srcSize - sizeof(bitD->bitContainer);
-		bitD->bitContainer = ZSTD_readLEST(bitD->ptr);
-		{
-			BYTE const lastByte = ((const BYTE *)srcBuffer)[srcSize - 1];
-			bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0; /* ensures bitsConsumed is always set */
-			if (lastByte == 0)
-				return ERROR(GENERIC); /* endMark not present */
-		}
-	} else {
-		bitD->start = (const char *)srcBuffer;
-		bitD->ptr = bitD->start;
-		bitD->bitContainer = *(const BYTE *)(bitD->start);
-		switch (srcSize) {
-		case 7: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[6]) << (sizeof(bitD->bitContainer) * 8 - 16);
-		case 6: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[5]) << (sizeof(bitD->bitContainer) * 8 - 24);
-		case 5: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[4]) << (sizeof(bitD->bitContainer) * 8 - 32);
-		case 4: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[3]) << 24;
-		case 3: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[2]) << 16;
-		case 2: bitD->bitContainer += (size_t)(((const BYTE *)(srcBuffer))[1]) << 8;
-		default:;
-		}
-		{
-			BYTE const lastByte = ((const BYTE *)srcBuffer)[srcSize - 1];
-			bitD->bitsConsumed = lastByte ? 8 - BIT_highbit32(lastByte) : 0;
-			if (lastByte == 0)
-				return ERROR(GENERIC); /* endMark not present */
-		}
-		bitD->bitsConsumed += (U32)(sizeof(bitD->bitContainer) - srcSize) * 8;
-	}
-
-	return srcSize;
-}
-
-ZSTD_STATIC size_t BIT_getUpperBits(size_t bitContainer, U32 const start) { return bitContainer >> start; }
-
-ZSTD_STATIC size_t BIT_getMiddleBits(size_t bitContainer, U32 const start, U32 const nbBits) { return (bitContainer >> start) & BIT_mask[nbBits]; }
-
-ZSTD_STATIC size_t BIT_getLowerBits(size_t bitContainer, U32 const nbBits) { return bitContainer & BIT_mask[nbBits]; }
-
-/*! BIT_lookBits() :
- *  Provides next n bits from local register.
- *  local register is not modified.
- *  On 32-bits, maxNbBits==24.
- *  On 64-bits, maxNbBits==56.
- *  @return : value extracted
- */
-ZSTD_STATIC size_t BIT_lookBits(const BIT_DStream_t *bitD, U32 nbBits)
-{
-	U32 const bitMask = sizeof(bitD->bitContainer) * 8 - 1;
-	return ((bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> 1) >> ((bitMask - nbBits) & bitMask);
-}
-
-/*! BIT_lookBitsFast() :
-*   unsafe version; only works only if nbBits >= 1 */
-ZSTD_STATIC size_t BIT_lookBitsFast(const BIT_DStream_t *bitD, U32 nbBits)
-{
-	U32 const bitMask = sizeof(bitD->bitContainer) * 8 - 1;
-	return (bitD->bitContainer << (bitD->bitsConsumed & bitMask)) >> (((bitMask + 1) - nbBits) & bitMask);
-}
-
-ZSTD_STATIC void BIT_skipBits(BIT_DStream_t *bitD, U32 nbBits) { bitD->bitsConsumed += nbBits; }
-
-/*! BIT_readBits() :
- *  Read (consume) next n bits from local register and update.
- *  Pay attention to not read more than nbBits contained into local register.
- *  @return : extracted value.
- */
-ZSTD_STATIC size_t BIT_readBits(BIT_DStream_t *bitD, U32 nbBits)
-{
-	size_t const value = BIT_lookBits(bitD, nbBits);
-	BIT_skipBits(bitD, nbBits);
-	return value;
-}
-
-/*! BIT_readBitsFast() :
-*   unsafe version; only works only if nbBits >= 1 */
-ZSTD_STATIC size_t BIT_readBitsFast(BIT_DStream_t *bitD, U32 nbBits)
-{
-	size_t const value = BIT_lookBitsFast(bitD, nbBits);
-	BIT_skipBits(bitD, nbBits);
-	return value;
-}
-
-/*! BIT_reloadDStream() :
-*   Refill `bitD` from buffer previously set in BIT_initDStream() .
-*   This function is safe, it guarantees it will not read beyond src buffer.
-*   @return : status of `BIT_DStream_t` internal register.
-			  if status == BIT_DStream_unfinished, internal register is filled with >= (sizeof(bitD->bitContainer)*8 - 7) bits */
-ZSTD_STATIC BIT_DStream_status BIT_reloadDStream(BIT_DStream_t *bitD)
-{
-	if (bitD->bitsConsumed > (sizeof(bitD->bitContainer) * 8)) /* should not happen => corruption detected */
-		return BIT_DStream_overflow;
-
-	if (bitD->ptr >= bitD->start + sizeof(bitD->bitContainer)) {
-		bitD->ptr -= bitD->bitsConsumed >> 3;
-		bitD->bitsConsumed &= 7;
-		bitD->bitContainer = ZSTD_readLEST(bitD->ptr);
-		return BIT_DStream_unfinished;
-	}
-	if (bitD->ptr == bitD->start) {
-		if (bitD->bitsConsumed < sizeof(bitD->bitContainer) * 8)
-			return BIT_DStream_endOfBuffer;
-		return BIT_DStream_completed;
-	}
-	{
-		U32 nbBytes = bitD->bitsConsumed >> 3;
-		BIT_DStream_status result = BIT_DStream_unfinished;
-		if (bitD->ptr - nbBytes < bitD->start) {
-			nbBytes = (U32)(bitD->ptr - bitD->start); /* ptr > start */
-			result = BIT_DStream_endOfBuffer;
-		}
-		bitD->ptr -= nbBytes;
-		bitD->bitsConsumed -= nbBytes * 8;
-		bitD->bitContainer = ZSTD_readLEST(bitD->ptr); /* reminder : srcSize > sizeof(bitD) */
-		return result;
-	}
-}
-
-/*! BIT_endOfDStream() :
-*   @return Tells if DStream has exactly reached its end (all bits consumed).
-*/
-ZSTD_STATIC unsigned BIT_endOfDStream(const BIT_DStream_t *DStream)
-{
-	return ((DStream->ptr == DStream->start) && (DStream->bitsConsumed == sizeof(DStream->bitContainer) * 8));
-}
-
-#endif /* BITSTREAM_H_MODULE */
@@ -1,243 +0,0 @@
-/*
- * Common functions of New Generation Entropy library
- * Copyright (C) 2016, Yann Collet.
- *
- * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *   * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *   * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- *
- * You can contact the author at :
- * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy
- */
-
-/* *************************************
-*  Dependencies
-***************************************/
-#include "error_private.h" /* ERR_*, ERROR */
-#include "fse.h"
-#include "huf.h"
-#include "mem.h"
-
-/*===   Version   ===*/
-unsigned FSE_versionNumber(void) { return FSE_VERSION_NUMBER; }
-
-/*===   Error Management   ===*/
-unsigned FSE_isError(size_t code) { return ERR_isError(code); }
-
-unsigned HUF_isError(size_t code) { return ERR_isError(code); }
-
-/*-**************************************************************
-*  FSE NCount encoding-decoding
-****************************************************************/
-size_t FSE_readNCount(short *normalizedCounter, unsigned *maxSVPtr, unsigned *tableLogPtr, const void *headerBuffer, size_t hbSize)
-{
-	const BYTE *const istart = (const BYTE *)headerBuffer;
-	const BYTE *const iend = istart + hbSize;
-	const BYTE *ip = istart;
-	int nbBits;
-	int remaining;
-	int threshold;
-	U32 bitStream;
-	int bitCount;
-	unsigned charnum = 0;
-	int previous0 = 0;
-
-	if (hbSize < 4)
-		return ERROR(srcSize_wrong);
-	bitStream = ZSTD_readLE32(ip);
-	nbBits = (bitStream & 0xF) + FSE_MIN_TABLELOG; /* extract tableLog */
-	if (nbBits > FSE_TABLELOG_ABSOLUTE_MAX)
-		return ERROR(tableLog_tooLarge);
-	bitStream >>= 4;
-	bitCount = 4;
-	*tableLogPtr = nbBits;
-	remaining = (1 << nbBits) + 1;
-	threshold = 1 << nbBits;
-	nbBits++;
-
-	while ((remaining > 1) & (charnum <= *maxSVPtr)) {
-		if (previous0) {
-			unsigned n0 = charnum;
-			while ((bitStream & 0xFFFF) == 0xFFFF) {
-				n0 += 24;
-				if (ip < iend - 5) {
-					ip += 2;
-					bitStream = ZSTD_readLE32(ip) >> bitCount;
-				} else {
-					bitStream >>= 16;
-					bitCount += 16;
-				}
-			}
-			while ((bitStream & 3) == 3) {
-				n0 += 3;
-				bitStream >>= 2;
-				bitCount += 2;
-			}
-			n0 += bitStream & 3;
-			bitCount += 2;
-			if (n0 > *maxSVPtr)
-				return ERROR(maxSymbolValue_tooSmall);
-			while (charnum < n0)
-				normalizedCounter[charnum++] = 0;
-			if ((ip <= iend - 7) || (ip + (bitCount >> 3) <= iend - 4)) {
-				ip += bitCount >> 3;
-				bitCount &= 7;
-				bitStream = ZSTD_readLE32(ip) >> bitCount;
-			} else {
-				bitStream >>= 2;
-			}
-		}
-		{
-			int const max = (2 * threshold - 1) - remaining;
-			int count;
-
-			if ((bitStream & (threshold - 1)) < (U32)max) {
-				count = bitStream & (threshold - 1);
-				bitCount += nbBits - 1;
-			} else {
-				count = bitStream & (2 * threshold - 1);
-				if (count >= threshold)
-					count -= max;
-				bitCount += nbBits;
-			}
-
-			count--;				 /* extra accuracy */
-			remaining -= count < 0 ? -count : count; /* -1 means +1 */
-			normalizedCounter[charnum++] = (short)count;
-			previous0 = !count;
-			while (remaining < threshold) {
-				nbBits--;
-				threshold >>= 1;
-			}
-
-			if ((ip <= iend - 7) || (ip + (bitCount >> 3) <= iend - 4)) {
-				ip += bitCount >> 3;
-				bitCount &= 7;
-			} else {
-				bitCount -= (int)(8 * (iend - 4 - ip));
-				ip = iend - 4;
-			}
-			bitStream = ZSTD_readLE32(ip) >> (bitCount & 31);
-		}
-	} /* while ((remaining>1) & (charnum<=*maxSVPtr)) */
-	if (remaining != 1)
-		return ERROR(corruption_detected);
-	if (bitCount > 32)
-		return ERROR(corruption_detected);
-	*maxSVPtr = charnum - 1;
-
-	ip += (bitCount + 7) >> 3;
-	return ip - istart;
-}
-
-/*! HUF_readStats() :
-	Read compact Huffman tree, saved by HUF_writeCTable().
-	`huffWeight` is destination buffer.
-	`rankStats` is assumed to be a table of at least HUF_TABLELOG_MAX U32.
-	@return : size read from `src` , or an error Code .
-	Note : Needed by HUF_readCTable() and HUF_readDTableX?() .
-*/
-size_t HUF_readStats_wksp(BYTE *huffWeight, size_t hwSize, U32 *rankStats, U32 *nbSymbolsPtr, U32 *tableLogPtr, const void *src, size_t srcSize, void *workspace, size_t workspaceSize)
-{
-	U32 weightTotal;
-	const BYTE *ip = (const BYTE *)src;
-	size_t iSize;
-	size_t oSize;
-
-	if (!srcSize)
-		return ERROR(srcSize_wrong);
-	iSize = ip[0];
-	/* memset(huffWeight, 0, hwSize);   */ /* is not necessary, even though some analyzer complain ... */
-
-	if (iSize >= 128) { /* special header */
-		oSize = iSize - 127;
-		iSize = ((oSize + 1) / 2);
-		if (iSize + 1 > srcSize)
-			return ERROR(srcSize_wrong);
-		if (oSize >= hwSize)
-			return ERROR(corruption_detected);
-		ip += 1;
-		{
-			U32 n;
-			for (n = 0; n < oSize; n += 2) {
-				huffWeight[n] = ip[n / 2] >> 4;
-				huffWeight[n + 1] = ip[n / 2] & 15;
-			}
-		}
-	} else {						 /* header compressed with FSE (normal case) */
-		if (iSize + 1 > srcSize)
-			return ERROR(srcSize_wrong);
-		oSize = FSE_decompress_wksp(huffWeight, hwSize - 1, ip + 1, iSize, 6, workspace, workspaceSize); /* max (hwSize-1) values decoded, as last one is implied */
-		if (FSE_isError(oSize))
-			return oSize;
-	}
-
-	/* collect weight stats */
-	memset(rankStats, 0, (HUF_TABLELOG_MAX + 1) * sizeof(U32));
-	weightTotal = 0;
-	{
-		U32 n;
-		for (n = 0; n < oSize; n++) {
-			if (huffWeight[n] >= HUF_TABLELOG_MAX)
-				return ERROR(corruption_detected);
-			rankStats[huffWeight[n]]++;
-			weightTotal += (1 << huffWeight[n]) >> 1;
-		}
-	}
-	if (weightTotal == 0)
-		return ERROR(corruption_detected);
-
-	/* get last non-null symbol weight (implied, total must be 2^n) */
-	{
-		U32 const tableLog = BIT_highbit32(weightTotal) + 1;
-		if (tableLog > HUF_TABLELOG_MAX)
-			return ERROR(corruption_detected);
-		*tableLogPtr = tableLog;
-		/* determine last weight */
-		{
-			U32 const total = 1 << tableLog;
-			U32 const rest = total - weightTotal;
-			U32 const verif = 1 << BIT_highbit32(rest);
-			U32 const lastWeight = BIT_highbit32(rest) + 1;
-			if (verif != rest)
-				return ERROR(corruption_detected); /* last value must be a clean power of 2 */
-			huffWeight[oSize] = (BYTE)lastWeight;
-			rankStats[lastWeight]++;
-		}
-	}
-
-	/* check tree construction validity */
-	if ((rankStats[1] < 2) || (rankStats[1] & 1))
-		return ERROR(corruption_detected); /* by construction : at least 2 elts of rank 1, must be even */
-
-	/* results */
-	*nbSymbolsPtr = (U32)(oSize + 1);
-	return iSize + 1;
-}
@@ -1,51 +0,0 @@
-/**
- * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of https://github.com/facebook/zstd.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- */
-
-/* Note : this module is expected to remain private, do not expose it */
-
-#ifndef ERROR_H_MODULE
-#define ERROR_H_MODULE
-
-/* ****************************************
-*  Dependencies
-******************************************/
-#include <linux/types.h> /* size_t */
-#include <linux/zstd.h>  /* enum list */
-
-/* ****************************************
-*  Compiler-specific
-******************************************/
-#define ERR_STATIC static __attribute__((unused))
-
-/*-****************************************
-*  Customization (error_public.h)
-******************************************/
-typedef ZSTD_ErrorCode ERR_enum;
-#define PREFIX(name) ZSTD_error_##name
-
-/*-****************************************
-*  Error codes handling
-******************************************/
-#define ERROR(name) ((size_t)-PREFIX(name))
-
-ERR_STATIC unsigned ERR_isError(size_t code) { return (code > ERROR(maxCode)); }
-
-ERR_STATIC ERR_enum ERR_getErrorCode(size_t code)
-{
-	if (!ERR_isError(code))
-		return (ERR_enum)0;
-	return (ERR_enum)(0 - code);
-}
-
-#endif /* ERROR_H_MODULE */
@@ -1,575 +0,0 @@
-/*
- * FSE : Finite State Entropy codec
- * Public Prototypes declaration
- * Copyright (C) 2013-2016, Yann Collet.
- *
- * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *   * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *   * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- *
- * You can contact the author at :
- * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy
- */
-#ifndef FSE_H
-#define FSE_H
-
-/*-*****************************************
-*  Dependencies
-******************************************/
-#include <linux/types.h> /* size_t, ptrdiff_t */
-
-/*-*****************************************
-*  FSE_PUBLIC_API : control library symbols visibility
-******************************************/
-#define FSE_PUBLIC_API
-
-/*------   Version   ------*/
-#define FSE_VERSION_MAJOR 0
-#define FSE_VERSION_MINOR 9
-#define FSE_VERSION_RELEASE 0
-
-#define FSE_LIB_VERSION FSE_VERSION_MAJOR.FSE_VERSION_MINOR.FSE_VERSION_RELEASE
-#define FSE_QUOTE(str) #str
-#define FSE_EXPAND_AND_QUOTE(str) FSE_QUOTE(str)
-#define FSE_VERSION_STRING FSE_EXPAND_AND_QUOTE(FSE_LIB_VERSION)
-
-#define FSE_VERSION_NUMBER (FSE_VERSION_MAJOR * 100 * 100 + FSE_VERSION_MINOR * 100 + FSE_VERSION_RELEASE)
-FSE_PUBLIC_API unsigned FSE_versionNumber(void); /**< library version number; to be used when checking dll version */
-
-/*-*****************************************
-*  Tool functions
-******************************************/
-FSE_PUBLIC_API size_t FSE_compressBound(size_t size); /* maximum compressed size */
-
-/* Error Management */
-FSE_PUBLIC_API unsigned FSE_isError(size_t code); /* tells if a return value is an error code */
-
-/*-*****************************************
-*  FSE detailed API
-******************************************/
-/*!
-FSE_compress() does the following:
-1. count symbol occurrence from source[] into table count[]
-2. normalize counters so that sum(count[]) == Power_of_2 (2^tableLog)
-3. save normalized counters to memory buffer using writeNCount()
-4. build encoding table 'CTable' from normalized counters
-5. encode the data stream using encoding table 'CTable'
-
-FSE_decompress() does the following:
-1. read normalized counters with readNCount()
-2. build decoding table 'DTable' from normalized counters
-3. decode the data stream using decoding table 'DTable'
-
-The following API allows targeting specific sub-functions for advanced tasks.
-For example, it's possible to compress several blocks using the same 'CTable',
-or to save and provide normalized distribution using external method.
-*/
-
-/* *** COMPRESSION *** */
-/*! FSE_optimalTableLog():
-	dynamically downsize 'tableLog' when conditions are met.
-	It saves CPU time, by using smaller tables, while preserving or even improving compression ratio.
-	@return : recommended tableLog (necessarily <= 'maxTableLog') */
-FSE_PUBLIC_API unsigned FSE_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue);
-
-/*! FSE_normalizeCount():
-	normalize counts so that sum(count[]) == Power_of_2 (2^tableLog)
-	'normalizedCounter' is a table of short, of minimum size (maxSymbolValue+1).
-	@return : tableLog,
-			  or an errorCode, which can be tested using FSE_isError() */
-FSE_PUBLIC_API size_t FSE_normalizeCount(short *normalizedCounter, unsigned tableLog, const unsigned *count, size_t srcSize, unsigned maxSymbolValue);
-
-/*! FSE_NCountWriteBound():
-	Provides the maximum possible size of an FSE normalized table, given 'maxSymbolValue' and 'tableLog'.
-	Typically useful for allocation purpose. */
-FSE_PUBLIC_API size_t FSE_NCountWriteBound(unsigned maxSymbolValue, unsigned tableLog);
-
-/*! FSE_writeNCount():
-	Compactly save 'normalizedCounter' into 'buffer'.
-	@return : size of the compressed table,
-			  or an errorCode, which can be tested using FSE_isError(). */
-FSE_PUBLIC_API size_t FSE_writeNCount(void *buffer, size_t bufferSize, const short *normalizedCounter, unsigned maxSymbolValue, unsigned tableLog);
-
-/*! Constructor and Destructor of FSE_CTable.
-	Note that FSE_CTable size depends on 'tableLog' and 'maxSymbolValue' */
-typedef unsigned FSE_CTable; /* don't allocate that. It's only meant to be more restrictive than void* */
-
-/*! FSE_compress_usingCTable():
-	Compress `src` using `ct` into `dst` which must be already allocated.
-	@return : size of compressed data (<= `dstCapacity`),
-			  or 0 if compressed data could not fit into `dst`,
-			  or an errorCode, which can be tested using FSE_isError() */
-FSE_PUBLIC_API size_t FSE_compress_usingCTable(void *dst, size_t dstCapacity, const void *src, size_t srcSize, const FSE_CTable *ct);
-
-/*!
-Tutorial :
----------
-The first step is to count all symbols. FSE_count() does this job very fast.
-Result will be saved into 'count', a table of unsigned int, which must be already allocated, and have 'maxSymbolValuePtr[0]+1' cells.
-'src' is a table of bytes of size 'srcSize'. All values within 'src' MUST be <= maxSymbolValuePtr[0]
-maxSymbolValuePtr[0] will be updated, with its real value (necessarily <= original value)
-FSE_count() will return the number of occurrence of the most frequent symbol.
-This can be used to know if there is a single symbol within 'src', and to quickly evaluate its compressibility.
-If there is an error, the function will return an ErrorCode (which can be tested using FSE_isError()).
-
-The next step is to normalize the frequencies.
-FSE_normalizeCount() will ensure that sum of frequencies is == 2 ^'tableLog'.
-It also guarantees a minimum of 1 to any Symbol with frequency >= 1.
-You can use 'tableLog'==0 to mean "use default tableLog value".
-If you are unsure of which tableLog value to use, you can ask FSE_optimalTableLog(),
-which will provide the optimal valid tableLog given sourceSize, maxSymbolValue, and a user-defined maximum (0 means "default").
-
-The result of FSE_normalizeCount() will be saved into a table,
-called 'normalizedCounter', which is a table of signed short.
-'normalizedCounter' must be already allocated, and have at least 'maxSymbolValue+1' cells.
-The return value is tableLog if everything proceeded as expected.
-It is 0 if there is a single symbol within distribution.
-If there is an error (ex: invalid tableLog value), the function will return an ErrorCode (which can be tested using FSE_isError()).
-
-'normalizedCounter' can be saved in a compact manner to a memory area using FSE_writeNCount().
-'buffer' must be already allocated.
-For guaranteed success, buffer size must be at least FSE_headerBound().
-The result of the function is the number of bytes written into 'buffer'.
-If there is an error, the function will return an ErrorCode (which can be tested using FSE_isError(); ex : buffer size too small).
-
-'normalizedCounter' can then be used to create the compression table 'CTable'.
-The space required by 'CTable' must be already allocated, using FSE_createCTable().
-You can then use FSE_buildCTable() to fill 'CTable'.
-If there is an error, both functions will return an ErrorCode (which can be tested using FSE_isError()).
-
-'CTable' can then be used to compress 'src', with FSE_compress_usingCTable().
-Similar to FSE_count(), the convention is that 'src' is assumed to be a table of char of size 'srcSize'
-The function returns the size of compressed data (without header), necessarily <= `dstCapacity`.
-If it returns '0', compressed data could not fit into 'dst'.
-If there is an error, the function will return an ErrorCode (which can be tested using FSE_isError()).
-*/
-
-/* *** DECOMPRESSION *** */
-
-/*! FSE_readNCount():
-	Read compactly saved 'normalizedCounter' from 'rBuffer'.
-	@return : size read from 'rBuffer',
-			  or an errorCode, which can be tested using FSE_isError().
-			  maxSymbolValuePtr[0] and tableLogPtr[0] will also be updated with their respective values */
-FSE_PUBLIC_API size_t FSE_readNCount(short *normalizedCounter, unsigned *maxSymbolValuePtr, unsigned *tableLogPtr, const void *rBuffer, size_t rBuffSize);
-
-/*! Constructor and Destructor of FSE_DTable.
-	Note that its size depends on 'tableLog' */
-typedef unsigned FSE_DTable; /* don't allocate that. It's just a way to be more restrictive than void* */
-
-/*! FSE_buildDTable():
-	Builds 'dt', which must be already allocated, using FSE_createDTable().
-	return : 0, or an errorCode, which can be tested using FSE_isError() */
-FSE_PUBLIC_API size_t FSE_buildDTable_wksp(FSE_DTable *dt, const short *normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void *workspace, size_t workspaceSize);
-
-/*! FSE_decompress_usingDTable():
-	Decompress compressed source `cSrc` of size `cSrcSize` using `dt`
-	into `dst` which must be already allocated.
-	@return : size of regenerated data (necessarily <= `dstCapacity`),
-			  or an errorCode, which can be tested using FSE_isError() */
-FSE_PUBLIC_API size_t FSE_decompress_usingDTable(void *dst, size_t dstCapacity, const void *cSrc, size_t cSrcSize, const FSE_DTable *dt);
-
-/*!
-Tutorial :
----------
-(Note : these functions only decompress FSE-compressed blocks.
- If block is uncompressed, use memcpy() instead
- If block is a single repeated byte, use memset() instead )
-
-The first step is to obtain the normalized frequencies of symbols.
-This can be performed by FSE_readNCount() if it was saved using FSE_writeNCount().
-'normalizedCounter' must be already allocated, and have at least 'maxSymbolValuePtr[0]+1' cells of signed short.
-In practice, that means it's necessary to know 'maxSymbolValue' beforehand,
-or size the table to handle worst case situations (typically 256).
-FSE_readNCount() will provide 'tableLog' and 'maxSymbolValue'.
-The result of FSE_readNCount() is the number of bytes read from 'rBuffer'.
-Note that 'rBufferSize' must be at least 4 bytes, even if useful information is less than that.
-If there is an error, the function will return an error code, which can be tested using FSE_isError().
-
-The next step is to build the decompression tables 'FSE_DTable' from 'normalizedCounter'.
-This is performed by the function FSE_buildDTable().
-The space required by 'FSE_DTable' must be already allocated using FSE_createDTable().
-If there is an error, the function will return an error code, which can be tested using FSE_isError().
-
-`FSE_DTable` can then be used to decompress `cSrc`, with FSE_decompress_usingDTable().
-`cSrcSize` must be strictly correct, otherwise decompression will fail.
-FSE_decompress_usingDTable() result will tell how many bytes were regenerated (<=`dstCapacity`).
-If there is an error, the function will return an error code, which can be tested using FSE_isError(). (ex: dst buffer too small)
-*/
-
-/* *** Dependency *** */
-#include "bitstream.h"
-
-/* *****************************************
-*  Static allocation
-*******************************************/
-/* FSE buffer bounds */
-#define FSE_NCOUNTBOUND 512
-#define FSE_BLOCKBOUND(size) (size + (size >> 7) + 4 /* constant for initial fse states */ )
-#define FSE_COMPRESSBOUND(size) (FSE_NCOUNTBOUND + FSE_BLOCKBOUND(size)) /* Macro version, useful for static allocation */
-
-/* It is possible to statically allocate FSE CTable/DTable as a table of FSE_CTable/FSE_DTable using below macros */
-#define FSE_CTABLE_SIZE_U32(maxTableLog, maxSymbolValue) (1 + (1 << (maxTableLog - 1)) + ((maxSymbolValue + 1) * 2))
-#define FSE_DTABLE_SIZE_U32(maxTableLog) (1 + (1 << maxTableLog))
-
-/* *****************************************
-*  FSE advanced API
-*******************************************/
-/* FSE_count_wksp() :
- * Same as FSE_count(), but using an externally provided scratch buffer.
- * `workSpace` size must be table of >= `1024` unsigned
- */
-size_t FSE_count_wksp(unsigned *count, unsigned *maxSymbolValuePtr, const void *source, size_t sourceSize, unsigned *workSpace);
-
-/* FSE_countFast_wksp() :
- * Same as FSE_countFast(), but using an externally provided scratch buffer.
- * `workSpace` must be a table of minimum `1024` unsigned
- */
-size_t FSE_countFast_wksp(unsigned *count, unsigned *maxSymbolValuePtr, const void *src, size_t srcSize, unsigned *workSpace);
-
-/*! FSE_count_simple
- * Same as FSE_countFast(), but does not use any additional memory (not even on stack).
- * This function is unsafe, and will segfault if any value within `src` is `> *maxSymbolValuePtr` (presuming it's also the size of `count`).
-*/
-size_t FSE_count_simple(unsigned *count, unsigned *maxSymbolValuePtr, const void *src, size_t srcSize);
-
-unsigned FSE_optimalTableLog_internal(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue, unsigned minus);
-/**< same as FSE_optimalTableLog(), which used `minus==2` */
-
-size_t FSE_buildCTable_raw(FSE_CTable *ct, unsigned nbBits);
-/**< build a fake FSE_CTable, designed for a flat distribution, where each symbol uses nbBits */
-
-size_t FSE_buildCTable_rle(FSE_CTable *ct, unsigned char symbolValue);
-/**< build a fake FSE_CTable, designed to compress always the same symbolValue */
-
-/* FSE_buildCTable_wksp() :
- * Same as FSE_buildCTable(), but using an externally allocated scratch buffer (`workSpace`).
- * `wkspSize` must be >= `(1<<tableLog)`.
- */
-size_t FSE_buildCTable_wksp(FSE_CTable *ct, const short *normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void *workSpace, size_t wkspSize);
-
-size_t FSE_buildDTable_raw(FSE_DTable *dt, unsigned nbBits);
-/**< build a fake FSE_DTable, designed to read a flat distribution where each symbol uses nbBits */
-
-size_t FSE_buildDTable_rle(FSE_DTable *dt, unsigned char symbolValue);
-/**< build a fake FSE_DTable, designed to always generate the same symbolValue */
-
-size_t FSE_decompress_wksp(void *dst, size_t dstCapacity, const void *cSrc, size_t cSrcSize, unsigned maxLog, void *workspace, size_t workspaceSize);
-/**< same as FSE_decompress(), using an externally allocated `workSpace` produced with `FSE_DTABLE_SIZE_U32(maxLog)` */
-
-/* *****************************************
-*  FSE symbol compression API
-*******************************************/
-/*!
-   This API consists of small unitary functions, which highly benefit from being inlined.
-   Hence their body are included in next section.
-*/
-typedef struct {
-	ptrdiff_t value;
-	const void *stateTable;
-	const void *symbolTT;
-	unsigned stateLog;
-} FSE_CState_t;
-
-static void FSE_initCState(FSE_CState_t *CStatePtr, const FSE_CTable *ct);
-
-static void FSE_encodeSymbol(BIT_CStream_t *bitC, FSE_CState_t *CStatePtr, unsigned symbol);
-
-static void FSE_flushCState(BIT_CStream_t *bitC, const FSE_CState_t *CStatePtr);
-
-/**<
-These functions are inner components of FSE_compress_usingCTable().
-They allow the creation of custom streams, mixing multiple tables and bit sources.
-
-A key property to keep in mind is that encoding and decoding are done **in reverse direction**.
-So the first symbol you will encode is the last you will decode, like a LIFO stack.
-
-You will need a few variables to track your CStream. They are :
-
-FSE_CTable    ct;         // Provided by FSE_buildCTable()
-BIT_CStream_t bitStream;  // bitStream tracking structure
-FSE_CState_t  state;      // State tracking structure (can have several)
-
-
-The first thing to do is to init bitStream and state.
-	size_t errorCode = BIT_initCStream(&bitStream, dstBuffer, maxDstSize);
-	FSE_initCState(&state, ct);
-
-Note that BIT_initCStream() can produce an error code, so its result should be tested, using FSE_isError();
-You can then encode your input data, byte after byte.
-FSE_encodeSymbol() outputs a maximum of 'tableLog' bits at a time.
-Remember decoding will be done in reverse direction.
-	FSE_encodeByte(&bitStream, &state, symbol);
-
-At any time, you can also add any bit sequence.
-Note : maximum allowed nbBits is 25, for compatibility with 32-bits decoders
-	BIT_addBits(&bitStream, bitField, nbBits);
-
-The above methods don't commit data to memory, they just store it into local register, for speed.
-Local register size is 64-bits on 64-bits systems, 32-bits on 32-bits systems (size_t).
-Writing data to memory is a manual operation, performed by the flushBits function.
-	BIT_flushBits(&bitStream);
-
-Your last FSE encoding operation shall be to flush your last state value(s).
-	FSE_flushState(&bitStream, &state);
-
-Finally, you must close the bitStream.
-The function returns the size of CStream in bytes.
-If data couldn't fit into dstBuffer, it will return a 0 ( == not compressible)
-If there is an error, it returns an errorCode (which can be tested using FSE_isError()).
-	size_t size = BIT_closeCStream(&bitStream);
-*/
-
-/* *****************************************
-*  FSE symbol decompression API
-*******************************************/
-typedef struct {
-	size_t state;
-	const void *table; /* precise table may vary, depending on U16 */
-} FSE_DState_t;
-
-static void FSE_initDState(FSE_DState_t *DStatePtr, BIT_DStream_t *bitD, const FSE_DTable *dt);
-
-static unsigned char FSE_decodeSymbol(FSE_DState_t *DStatePtr, BIT_DStream_t *bitD);
-
-static unsigned FSE_endOfDState(const FSE_DState_t *DStatePtr);
-
-/**<
-Let's now decompose FSE_decompress_usingDTable() into its unitary components.
-You will decode FSE-encoded symbols from the bitStream,
-and also any other bitFields you put in, **in reverse order**.
-
-You will need a few variables to track your bitStream. They are :
-
-BIT_DStream_t DStream;    // Stream context
-FSE_DState_t  DState;     // State context. Multiple ones are possible
-FSE_DTable*   DTablePtr;  // Decoding table, provided by FSE_buildDTable()
-
-The first thing to do is to init the bitStream.
-	errorCode = BIT_initDStream(&DStream, srcBuffer, srcSize);
-
-You should then retrieve your initial state(s)
-(in reverse flushing order if you have several ones) :
-	errorCode = FSE_initDState(&DState, &DStream, DTablePtr);
-
-You can then decode your data, symbol after symbol.
-For information the maximum number of bits read by FSE_decodeSymbol() is 'tableLog'.
-Keep in mind that symbols are decoded in reverse order, like a LIFO stack (last in, first out).
-	unsigned char symbol = FSE_decodeSymbol(&DState, &DStream);
-
-You can retrieve any bitfield you eventually stored into the bitStream (in reverse order)
-Note : maximum allowed nbBits is 25, for 32-bits compatibility
-	size_t bitField = BIT_readBits(&DStream, nbBits);
-
-All above operations only read from local register (which size depends on size_t).
-Refueling the register from memory is manually performed by the reload method.
-	endSignal = FSE_reloadDStream(&DStream);
-
-BIT_reloadDStream() result tells if there is still some more data to read from DStream.
-BIT_DStream_unfinished : there is still some data left into the DStream.
-BIT_DStream_endOfBuffer : Dstream reached end of buffer. Its container may no longer be completely filled.
-BIT_DStream_completed : Dstream reached its exact end, corresponding in general to decompression completed.
-BIT_DStream_tooFar : Dstream went too far. Decompression result is corrupted.
-
-When reaching end of buffer (BIT_DStream_endOfBuffer), progress slowly, notably if you decode multiple symbols per loop,
-to properly detect the exact end of stream.
-After each decoded symbol, check if DStream is fully consumed using this simple test :
-	BIT_reloadDStream(&DStream) >= BIT_DStream_completed
-
-When it's done, verify decompression is fully completed, by checking both DStream and the relevant states.
-Checking if DStream has reached its end is performed by :
-	BIT_endOfDStream(&DStream);
-Check also the states. There might be some symbols left there, if some high probability ones (>50%) are possible.
-	FSE_endOfDState(&DState);
-*/
-
-/* *****************************************
-*  FSE unsafe API
-*******************************************/
-static unsigned char FSE_decodeSymbolFast(FSE_DState_t *DStatePtr, BIT_DStream_t *bitD);
-/* faster, but works only if nbBits is always >= 1 (otherwise, result will be corrupted) */
-
-/* *****************************************
-*  Implementation of inlined functions
-*******************************************/
-typedef struct {
-	int deltaFindState;
-	U32 deltaNbBits;
-} FSE_symbolCompressionTransform; /* total 8 bytes */
-
-ZSTD_STATIC void FSE_initCState(FSE_CState_t *statePtr, const FSE_CTable *ct)
-{
-	const void *ptr = ct;
-	const U16 *u16ptr = (const U16 *)ptr;
-	const U32 tableLog = ZSTD_read16(ptr);
-	statePtr->value = (ptrdiff_t)1 << tableLog;
-	statePtr->stateTable = u16ptr + 2;
-	statePtr->symbolTT = ((const U32 *)ct + 1 + (tableLog ? (1 << (tableLog - 1)) : 1));
-	statePtr->stateLog = tableLog;
-}
-
-/*! FSE_initCState2() :
-*   Same as FSE_initCState(), but the first symbol to include (which will be the last to be read)
-*   uses the smallest state value possible, saving the cost of this symbol */
-ZSTD_STATIC void FSE_initCState2(FSE_CState_t *statePtr, const FSE_CTable *ct, U32 symbol)
-{
-	FSE_initCState(statePtr, ct);
-	{
-		const FSE_symbolCompressionTransform symbolTT = ((const FSE_symbolCompressionTransform *)(statePtr->symbolTT))[symbol];
-		const U16 *stateTable = (const U16 *)(statePtr->stateTable);
-		U32 nbBitsOut = (U32)((symbolTT.deltaNbBits + (1 << 15)) >> 16);
-		statePtr->value = (nbBitsOut << 16) - symbolTT.deltaNbBits;
-		statePtr->value = stateTable[(statePtr->value >> nbBitsOut) + symbolTT.deltaFindState];
-	}
-}
-
-ZSTD_STATIC void FSE_encodeSymbol(BIT_CStream_t *bitC, FSE_CState_t *statePtr, U32 symbol)
-{
-	const FSE_symbolCompressionTransform symbolTT = ((const FSE_symbolCompressionTransform *)(statePtr->symbolTT))[symbol];
-	const U16 *const stateTable = (const U16 *)(statePtr->stateTable);
-	U32 nbBitsOut = (U32)((statePtr->value + symbolTT.deltaNbBits) >> 16);
-	BIT_addBits(bitC, statePtr->value, nbBitsOut);
-	statePtr->value = stateTable[(statePtr->value >> nbBitsOut) + symbolTT.deltaFindState];
-}
-
-ZSTD_STATIC void FSE_flushCState(BIT_CStream_t *bitC, const FSE_CState_t *statePtr)
-{
-	BIT_addBits(bitC, statePtr->value, statePtr->stateLog);
-	BIT_flushBits(bitC);
-}
-
-/* ======    Decompression    ====== */
-
-typedef struct {
-	U16 tableLog;
-	U16 fastMode;
-} FSE_DTableHeader; /* sizeof U32 */
-
-typedef struct {
-	unsigned short newState;
-	unsigned char symbol;
-	unsigned char nbBits;
-} FSE_decode_t; /* size == U32 */
-
-ZSTD_STATIC void FSE_initDState(FSE_DState_t *DStatePtr, BIT_DStream_t *bitD, const FSE_DTable *dt)
-{
-	const void *ptr = dt;
-	const FSE_DTableHeader *const DTableH = (const FSE_DTableHeader *)ptr;
-	DStatePtr->state = BIT_readBits(bitD, DTableH->tableLog);
-	BIT_reloadDStream(bitD);
-	DStatePtr->table = dt + 1;
-}
-
-ZSTD_STATIC BYTE FSE_peekSymbol(const FSE_DState_t *DStatePtr)
-{
-	FSE_decode_t const DInfo = ((const FSE_decode_t *)(DStatePtr->table))[DStatePtr->state];
-	return DInfo.symbol;
-}
-
-ZSTD_STATIC void FSE_updateState(FSE_DState_t *DStatePtr, BIT_DStream_t *bitD)
-{
-	FSE_decode_t const DInfo = ((const FSE_decode_t *)(DStatePtr->table))[DStatePtr->state];
-	U32 const nbBits = DInfo.nbBits;
-	size_t const lowBits = BIT_readBits(bitD, nbBits);
-	DStatePtr->state = DInfo.newState + lowBits;
-}
-
-ZSTD_STATIC BYTE FSE_decodeSymbol(FSE_DState_t *DStatePtr, BIT_DStream_t *bitD)
-{
-	FSE_decode_t const DInfo = ((const FSE_decode_t *)(DStatePtr->table))[DStatePtr->state];
-	U32 const nbBits = DInfo.nbBits;
-	BYTE const symbol = DInfo.symbol;
-	size_t const lowBits = BIT_readBits(bitD, nbBits);
-
-	DStatePtr->state = DInfo.newState + lowBits;
-	return symbol;
-}
-
-/*! FSE_decodeSymbolFast() :
-	unsafe, only works if no symbol has a probability > 50% */
-ZSTD_STATIC BYTE FSE_decodeSymbolFast(FSE_DState_t *DStatePtr, BIT_DStream_t *bitD)
-{
-	FSE_decode_t const DInfo = ((const FSE_decode_t *)(DStatePtr->table))[DStatePtr->state];
-	U32 const nbBits = DInfo.nbBits;
-	BYTE const symbol = DInfo.symbol;
-	size_t const lowBits = BIT_readBitsFast(bitD, nbBits);
-
-	DStatePtr->state = DInfo.newState + lowBits;
-	return symbol;
-}
-
-ZSTD_STATIC unsigned FSE_endOfDState(const FSE_DState_t *DStatePtr) { return DStatePtr->state == 0; }
-
-/* **************************************************************
-*  Tuning parameters
-****************************************************************/
-/*!MEMORY_USAGE :
-*  Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; etc.)
-*  Increasing memory usage improves compression ratio
-*  Reduced memory usage can improve speed, due to cache effect
-*  Recommended max value is 14, for 16KB, which nicely fits into Intel x86 L1 cache */
-#ifndef FSE_MAX_MEMORY_USAGE
-#define FSE_MAX_MEMORY_USAGE 14
-#endif
-#ifndef FSE_DEFAULT_MEMORY_USAGE
-#define FSE_DEFAULT_MEMORY_USAGE 13
-#endif
-
-/*!FSE_MAX_SYMBOL_VALUE :
-*  Maximum symbol value authorized.
-*  Required for proper stack allocation */
-#ifndef FSE_MAX_SYMBOL_VALUE
-#define FSE_MAX_SYMBOL_VALUE 255
-#endif
-
-/* **************************************************************
-*  template functions type & suffix
-****************************************************************/
-#define FSE_FUNCTION_TYPE BYTE
-#define FSE_FUNCTION_EXTENSION
-#define FSE_DECODE_TYPE FSE_decode_t
-
-/* ***************************************************************
-*  Constants
-*****************************************************************/
-#define FSE_MAX_TABLELOG (FSE_MAX_MEMORY_USAGE - 2)
-#define FSE_MAX_TABLESIZE (1U << FSE_MAX_TABLELOG)
-#define FSE_MAXTABLESIZE_MASK (FSE_MAX_TABLESIZE - 1)
-#define FSE_DEFAULT_TABLELOG (FSE_DEFAULT_MEMORY_USAGE - 2)
-#define FSE_MIN_TABLELOG 5
-
-#define FSE_TABLELOG_ABSOLUTE_MAX 15
-#if FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX
-#error "FSE_MAX_TABLELOG > FSE_TABLELOG_ABSOLUTE_MAX is not supported"
-#endif
-
-#define FSE_TABLESTEP(tableSize) ((tableSize >> 1) + (tableSize >> 3) + 3)
-
-#endif /* FSE_H */
@@ -1,795 +0,0 @@
-/*
- * FSE : Finite State Entropy encoder
- * Copyright (C) 2013-2015, Yann Collet.
- *
- * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *   * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *   * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- *
- * You can contact the author at :
- * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy
- */
-
-/* **************************************************************
-*  Compiler specifics
-****************************************************************/
-#define FORCE_INLINE static __always_inline
-
-/* **************************************************************
-*  Includes
-****************************************************************/
-#include "bitstream.h"
-#include "fse.h"
-#include <linux/compiler.h>
-#include <linux/kernel.h>
-#include <linux/math64.h>
-#include <linux/string.h> /* memcpy, memset */
-
-/* **************************************************************
-*  Error Management
-****************************************************************/
-#define FSE_STATIC_ASSERT(c)                                   \
-	{                                                      \
-		enum { FSE_static_assert = 1 / (int)(!!(c)) }; \
-	} /* use only *after* variable declarations */
-
-/* **************************************************************
-*  Templates
-****************************************************************/
-/*
-  designed to be included
-  for type-specific functions (template emulation in C)
-  Objective is to write these functions only once, for improved maintenance
-*/
-
-/* safety checks */
-#ifndef FSE_FUNCTION_EXTENSION
-#error "FSE_FUNCTION_EXTENSION must be defined"
-#endif
-#ifndef FSE_FUNCTION_TYPE
-#error "FSE_FUNCTION_TYPE must be defined"
-#endif
-
-/* Function names */
-#define FSE_CAT(X, Y) X##Y
-#define FSE_FUNCTION_NAME(X, Y) FSE_CAT(X, Y)
-#define FSE_TYPE_NAME(X, Y) FSE_CAT(X, Y)
-
-/* Function templates */
-
-/* FSE_buildCTable_wksp() :
- * Same as FSE_buildCTable(), but using an externally allocated scratch buffer (`workSpace`).
- * wkspSize should be sized to handle worst case situation, which is `1<<max_tableLog * sizeof(FSE_FUNCTION_TYPE)`
- * workSpace must also be properly aligned with FSE_FUNCTION_TYPE requirements
- */
-size_t FSE_buildCTable_wksp(FSE_CTable *ct, const short *normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void *workspace, size_t workspaceSize)
-{
-	U32 const tableSize = 1 << tableLog;
-	U32 const tableMask = tableSize - 1;
-	void *const ptr = ct;
-	U16 *const tableU16 = ((U16 *)ptr) + 2;
-	void *const FSCT = ((U32 *)ptr) + 1 /* header */ + (tableLog ? tableSize >> 1 : 1);
-	FSE_symbolCompressionTransform *const symbolTT = (FSE_symbolCompressionTransform *)(FSCT);
-	U32 const step = FSE_TABLESTEP(tableSize);
-	U32 highThreshold = tableSize - 1;
-
-	U32 *cumul;
-	FSE_FUNCTION_TYPE *tableSymbol;
-	size_t spaceUsed32 = 0;
-
-	cumul = (U32 *)workspace + spaceUsed32;
-	spaceUsed32 += FSE_MAX_SYMBOL_VALUE + 2;
-	tableSymbol = (FSE_FUNCTION_TYPE *)((U32 *)workspace + spaceUsed32);
-	spaceUsed32 += ALIGN(sizeof(FSE_FUNCTION_TYPE) * ((size_t)1 << tableLog), sizeof(U32)) >> 2;
-
-	if ((spaceUsed32 << 2) > workspaceSize)
-		return ERROR(tableLog_tooLarge);
-	workspace = (U32 *)workspace + spaceUsed32;
-	workspaceSize -= (spaceUsed32 << 2);
-
-	/* CTable header */
-	tableU16[-2] = (U16)tableLog;
-	tableU16[-1] = (U16)maxSymbolValue;
-
-	/* For explanations on how to distribute symbol values over the table :
-	*  http://fastcompression.blogspot.fr/2014/02/fse-distributing-symbol-values.html */
-
-	/* symbol start positions */
-	{
-		U32 u;
-		cumul[0] = 0;
-		for (u = 1; u <= maxSymbolValue + 1; u++) {
-			if (normalizedCounter[u - 1] == -1) { /* Low proba symbol */
-				cumul[u] = cumul[u - 1] + 1;
-				tableSymbol[highThreshold--] = (FSE_FUNCTION_TYPE)(u - 1);
-			} else {
-				cumul[u] = cumul[u - 1] + normalizedCounter[u - 1];
-			}
-		}
-		cumul[maxSymbolValue + 1] = tableSize + 1;
-	}
-
-	/* Spread symbols */
-	{
-		U32 position = 0;
-		U32 symbol;
-		for (symbol = 0; symbol <= maxSymbolValue; symbol++) {
-			int nbOccurrences;
-			for (nbOccurrences = 0; nbOccurrences < normalizedCounter[symbol]; nbOccurrences++) {
-				tableSymbol[position] = (FSE_FUNCTION_TYPE)symbol;
-				position = (position + step) & tableMask;
-				while (position > highThreshold)
-					position = (position + step) & tableMask; /* Low proba area */
-			}
-		}
-
-		if (position != 0)
-			return ERROR(GENERIC); /* Must have gone through all positions */
-	}
-
-	/* Build table */
-	{
-		U32 u;
-		for (u = 0; u < tableSize; u++) {
-			FSE_FUNCTION_TYPE s = tableSymbol[u];	/* note : static analyzer may not understand tableSymbol is properly initialized */
-			tableU16[cumul[s]++] = (U16)(tableSize + u); /* TableU16 : sorted by symbol order; gives next state value */
-		}
-	}
-
-	/* Build Symbol Transformation Table */
-	{
-		unsigned total = 0;
-		unsigned s;
-		for (s = 0; s <= maxSymbolValue; s++) {
-			switch (normalizedCounter[s]) {
-			case 0: break;
-
-			case -1:
-			case 1:
-				symbolTT[s].deltaNbBits = (tableLog << 16) - (1 << tableLog);
-				symbolTT[s].deltaFindState = total - 1;
-				total++;
-				break;
-			default: {
-				U32 const maxBitsOut = tableLog - BIT_highbit32(normalizedCounter[s] - 1);
-				U32 const minStatePlus = normalizedCounter[s] << maxBitsOut;
-				symbolTT[s].deltaNbBits = (maxBitsOut << 16) - minStatePlus;
-				symbolTT[s].deltaFindState = total - normalizedCounter[s];
-				total += normalizedCounter[s];
-			}
-			}
-		}
-	}
-
-	return 0;
-}
-
-/*-**************************************************************
-*  FSE NCount encoding-decoding
-****************************************************************/
-size_t FSE_NCountWriteBound(unsigned maxSymbolValue, unsigned tableLog)
-{
-	size_t const maxHeaderSize = (((maxSymbolValue + 1) * tableLog) >> 3) + 3;
-	return maxSymbolValue ? maxHeaderSize : FSE_NCOUNTBOUND; /* maxSymbolValue==0 ? use default */
-}
-
-static size_t FSE_writeNCount_generic(void *header, size_t headerBufferSize, const short *normalizedCounter, unsigned maxSymbolValue, unsigned tableLog,
-				      unsigned writeIsSafe)
-{
-	BYTE *const ostart = (BYTE *)header;
-	BYTE *out = ostart;
-	BYTE *const oend = ostart + headerBufferSize;
-	int nbBits;
-	const int tableSize = 1 << tableLog;
-	int remaining;
-	int threshold;
-	U32 bitStream;
-	int bitCount;
-	unsigned charnum = 0;
-	int previous0 = 0;
-
-	bitStream = 0;
-	bitCount = 0;
-	/* Table Size */
-	bitStream += (tableLog - FSE_MIN_TABLELOG) << bitCount;
-	bitCount += 4;
-
-	/* Init */
-	remaining = tableSize + 1; /* +1 for extra accuracy */
-	threshold = tableSize;
-	nbBits = tableLog + 1;
-
-	while (remaining > 1) { /* stops at 1 */
-		if (previous0) {
-			unsigned start = charnum;
-			while (!normalizedCounter[charnum])
-				charnum++;
-			while (charnum >= start + 24) {
-				start += 24;
-				bitStream += 0xFFFFU << bitCount;
-				if ((!writeIsSafe) && (out > oend - 2))
-					return ERROR(dstSize_tooSmall); /* Buffer overflow */
-				out[0] = (BYTE)bitStream;
-				out[1] = (BYTE)(bitStream >> 8);
-				out += 2;
-				bitStream >>= 16;
-			}
-			while (charnum >= start + 3) {
-				start += 3;
-				bitStream += 3 << bitCount;
-				bitCount += 2;
-			}
-			bitStream += (charnum - start) << bitCount;
-			bitCount += 2;
-			if (bitCount > 16) {
-				if ((!writeIsSafe) && (out > oend - 2))
-					return ERROR(dstSize_tooSmall); /* Buffer overflow */
-				out[0] = (BYTE)bitStream;
-				out[1] = (BYTE)(bitStream >> 8);
-				out += 2;
-				bitStream >>= 16;
-				bitCount -= 16;
-			}
-		}
-		{
-			int count = normalizedCounter[charnum++];
-			int const max = (2 * threshold - 1) - remaining;
-			remaining -= count < 0 ? -count : count;
-			count++; /* +1 for extra accuracy */
-			if (count >= threshold)
-				count += max; /* [0..max[ [max..threshold[ (...) [threshold+max 2*threshold[ */
-			bitStream += count << bitCount;
-			bitCount += nbBits;
-			bitCount -= (count < max);
-			previous0 = (count == 1);
-			if (remaining < 1)
-				return ERROR(GENERIC);
-			while (remaining < threshold)
-				nbBits--, threshold >>= 1;
-		}
-		if (bitCount > 16) {
-			if ((!writeIsSafe) && (out > oend - 2))
-				return ERROR(dstSize_tooSmall); /* Buffer overflow */
-			out[0] = (BYTE)bitStream;
-			out[1] = (BYTE)(bitStream >> 8);
-			out += 2;
-			bitStream >>= 16;
-			bitCount -= 16;
-		}
-	}
-
-	/* flush remaining bitStream */
-	if ((!writeIsSafe) && (out > oend - 2))
-		return ERROR(dstSize_tooSmall); /* Buffer overflow */
-	out[0] = (BYTE)bitStream;
-	out[1] = (BYTE)(bitStream >> 8);
-	out += (bitCount + 7) / 8;
-
-	if (charnum > maxSymbolValue + 1)
-		return ERROR(GENERIC);
-
-	return (out - ostart);
-}
-
-size_t FSE_writeNCount(void *buffer, size_t bufferSize, const short *normalizedCounter, unsigned maxSymbolValue, unsigned tableLog)
-{
-	if (tableLog > FSE_MAX_TABLELOG)
-		return ERROR(tableLog_tooLarge); /* Unsupported */
-	if (tableLog < FSE_MIN_TABLELOG)
-		return ERROR(GENERIC); /* Unsupported */
-
-	if (bufferSize < FSE_NCountWriteBound(maxSymbolValue, tableLog))
-		return FSE_writeNCount_generic(buffer, bufferSize, normalizedCounter, maxSymbolValue, tableLog, 0);
-
-	return FSE_writeNCount_generic(buffer, bufferSize, normalizedCounter, maxSymbolValue, tableLog, 1);
-}
-
-/*-**************************************************************
-*  Counting histogram
-****************************************************************/
-/*! FSE_count_simple
-	This function counts byte values within `src`, and store the histogram into table `count`.
-	It doesn't use any additional memory.
-	But this function is unsafe : it doesn't check that all values within `src` can fit into `count`.
-	For this reason, prefer using a table `count` with 256 elements.
-	@return : count of most numerous element
-*/
-size_t FSE_count_simple(unsigned *count, unsigned *maxSymbolValuePtr, const void *src, size_t srcSize)
-{
-	const BYTE *ip = (const BYTE *)src;
-	const BYTE *const end = ip + srcSize;
-	unsigned maxSymbolValue = *maxSymbolValuePtr;
-	unsigned max = 0;
-
-	memset(count, 0, (maxSymbolValue + 1) * sizeof(*count));
-	if (srcSize == 0) {
-		*maxSymbolValuePtr = 0;
-		return 0;
-	}
-
-	while (ip < end)
-		count[*ip++]++;
-
-	while (!count[maxSymbolValue])
-		maxSymbolValue--;
-	*maxSymbolValuePtr = maxSymbolValue;
-
-	{
-		U32 s;
-		for (s = 0; s <= maxSymbolValue; s++)
-			if (count[s] > max)
-				max = count[s];
-	}
-
-	return (size_t)max;
-}
-
-/* FSE_count_parallel_wksp() :
- * Same as FSE_count_parallel(), but using an externally provided scratch buffer.
- * `workSpace` size must be a minimum of `1024 * sizeof(unsigned)`` */
-static size_t FSE_count_parallel_wksp(unsigned *count, unsigned *maxSymbolValuePtr, const void *source, size_t sourceSize, unsigned checkMax,
-				      unsigned *const workSpace)
-{
-	const BYTE *ip = (const BYTE *)source;
-	const BYTE *const iend = ip + sourceSize;
-	unsigned maxSymbolValue = *maxSymbolValuePtr;
-	unsigned max = 0;
-	U32 *const Counting1 = workSpace;
-	U32 *const Counting2 = Counting1 + 256;
-	U32 *const Counting3 = Counting2 + 256;
-	U32 *const Counting4 = Counting3 + 256;
-
-	memset(Counting1, 0, 4 * 256 * sizeof(unsigned));
-
-	/* safety checks */
-	if (!sourceSize) {
-		memset(count, 0, maxSymbolValue + 1);
-		*maxSymbolValuePtr = 0;
-		return 0;
-	}
-	if (!maxSymbolValue)
-		maxSymbolValue = 255; /* 0 == default */
-
-	/* by stripes of 16 bytes */
-	{
-		U32 cached = ZSTD_read32(ip);
-		ip += 4;
-		while (ip < iend - 15) {
-			U32 c = cached;
-			cached = ZSTD_read32(ip);
-			ip += 4;
-			Counting1[(BYTE)c]++;
-			Counting2[(BYTE)(c >> 8)]++;
-			Counting3[(BYTE)(c >> 16)]++;
-			Counting4[c >> 24]++;
-			c = cached;
-			cached = ZSTD_read32(ip);
-			ip += 4;
-			Counting1[(BYTE)c]++;
-			Counting2[(BYTE)(c >> 8)]++;
-			Counting3[(BYTE)(c >> 16)]++;
-			Counting4[c >> 24]++;
-			c = cached;
-			cached = ZSTD_read32(ip);
-			ip += 4;
-			Counting1[(BYTE)c]++;
-			Counting2[(BYTE)(c >> 8)]++;
-			Counting3[(BYTE)(c >> 16)]++;
-			Counting4[c >> 24]++;
-			c = cached;
-			cached = ZSTD_read32(ip);
-			ip += 4;
-			Counting1[(BYTE)c]++;
-			Counting2[(BYTE)(c >> 8)]++;
-			Counting3[(BYTE)(c >> 16)]++;
-			Counting4[c >> 24]++;
-		}
-		ip -= 4;
-	}
-
-	/* finish last symbols */
-	while (ip < iend)
-		Counting1[*ip++]++;
-
-	if (checkMax) { /* verify stats will fit into destination table */
-		U32 s;
-		for (s = 255; s > maxSymbolValue; s--) {
-			Counting1[s] += Counting2[s] + Counting3[s] + Counting4[s];
-			if (Counting1[s])
-				return ERROR(maxSymbolValue_tooSmall);
-		}
-	}
-
-	{
-		U32 s;
-		for (s = 0; s <= maxSymbolValue; s++) {
-			count[s] = Counting1[s] + Counting2[s] + Counting3[s] + Counting4[s];
-			if (count[s] > max)
-				max = count[s];
-		}
-	}
-
-	while (!count[maxSymbolValue])
-		maxSymbolValue--;
-	*maxSymbolValuePtr = maxSymbolValue;
-	return (size_t)max;
-}
-
-/* FSE_countFast_wksp() :
- * Same as FSE_countFast(), but using an externally provided scratch buffer.
- * `workSpace` size must be table of >= `1024` unsigned */
-size_t FSE_countFast_wksp(unsigned *count, unsigned *maxSymbolValuePtr, const void *source, size_t sourceSize, unsigned *workSpace)
-{
-	if (sourceSize < 1500)
-		return FSE_count_simple(count, maxSymbolValuePtr, source, sourceSize);
-	return FSE_count_parallel_wksp(count, maxSymbolValuePtr, source, sourceSize, 0, workSpace);
-}
-
-/* FSE_count_wksp() :
- * Same as FSE_count(), but using an externally provided scratch buffer.
- * `workSpace` size must be table of >= `1024` unsigned */
-size_t FSE_count_wksp(unsigned *count, unsigned *maxSymbolValuePtr, const void *source, size_t sourceSize, unsigned *workSpace)
-{
-	if (*maxSymbolValuePtr < 255)
-		return FSE_count_parallel_wksp(count, maxSymbolValuePtr, source, sourceSize, 1, workSpace);
-	*maxSymbolValuePtr = 255;
-	return FSE_countFast_wksp(count, maxSymbolValuePtr, source, sourceSize, workSpace);
-}
-
-/*-**************************************************************
-*  FSE Compression Code
-****************************************************************/
-/*! FSE_sizeof_CTable() :
-	FSE_CTable is a variable size structure which contains :
-	`U16 tableLog;`
-	`U16 maxSymbolValue;`
-	`U16 nextStateNumber[1 << tableLog];`                         // This size is variable
-	`FSE_symbolCompressionTransform symbolTT[maxSymbolValue+1];`  // This size is variable
-Allocation is manual (C standard does not support variable-size structures).
-*/
-size_t FSE_sizeof_CTable(unsigned maxSymbolValue, unsigned tableLog)
-{
-	if (tableLog > FSE_MAX_TABLELOG)
-		return ERROR(tableLog_tooLarge);
-	return FSE_CTABLE_SIZE_U32(tableLog, maxSymbolValue) * sizeof(U32);
-}
-
-/* provides the minimum logSize to safely represent a distribution */
-static unsigned FSE_minTableLog(size_t srcSize, unsigned maxSymbolValue)
-{
-	U32 minBitsSrc = BIT_highbit32((U32)(srcSize - 1)) + 1;
-	U32 minBitsSymbols = BIT_highbit32(maxSymbolValue) + 2;
-	U32 minBits = minBitsSrc < minBitsSymbols ? minBitsSrc : minBitsSymbols;
-	return minBits;
-}
-
-unsigned FSE_optimalTableLog_internal(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue, unsigned minus)
-{
-	U32 maxBitsSrc = BIT_highbit32((U32)(srcSize - 1)) - minus;
-	U32 tableLog = maxTableLog;
-	U32 minBits = FSE_minTableLog(srcSize, maxSymbolValue);
-	if (tableLog == 0)
-		tableLog = FSE_DEFAULT_TABLELOG;
-	if (maxBitsSrc < tableLog)
-		tableLog = maxBitsSrc; /* Accuracy can be reduced */
-	if (minBits > tableLog)
-		tableLog = minBits; /* Need a minimum to safely represent all symbol values */
-	if (tableLog < FSE_MIN_TABLELOG)
-		tableLog = FSE_MIN_TABLELOG;
-	if (tableLog > FSE_MAX_TABLELOG)
-		tableLog = FSE_MAX_TABLELOG;
-	return tableLog;
-}
-
-unsigned FSE_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue)
-{
-	return FSE_optimalTableLog_internal(maxTableLog, srcSize, maxSymbolValue, 2);
-}
-
-/* Secondary normalization method.
-   To be used when primary method fails. */
-
-static size_t FSE_normalizeM2(short *norm, U32 tableLog, const unsigned *count, size_t total, U32 maxSymbolValue)
-{
-	short const NOT_YET_ASSIGNED = -2;
-	U32 s;
-	U32 distributed = 0;
-	U32 ToDistribute;
-
-	/* Init */
-	U32 const lowThreshold = (U32)(total >> tableLog);
-	U32 lowOne = (U32)((total * 3) >> (tableLog + 1));
-
-	for (s = 0; s <= maxSymbolValue; s++) {
-		if (count[s] == 0) {
-			norm[s] = 0;
-			continue;
-		}
-		if (count[s] <= lowThreshold) {
-			norm[s] = -1;
-			distributed++;
-			total -= count[s];
-			continue;
-		}
-		if (count[s] <= lowOne) {
-			norm[s] = 1;
-			distributed++;
-			total -= count[s];
-			continue;
-		}
-
-		norm[s] = NOT_YET_ASSIGNED;
-	}
-	ToDistribute = (1 << tableLog) - distributed;
-
-	if ((total / ToDistribute) > lowOne) {
-		/* risk of rounding to zero */
-		lowOne = (U32)((total * 3) / (ToDistribute * 2));
-		for (s = 0; s <= maxSymbolValue; s++) {
-			if ((norm[s] == NOT_YET_ASSIGNED) && (count[s] <= lowOne)) {
-				norm[s] = 1;
-				distributed++;
-				total -= count[s];
-				continue;
-			}
-		}
-		ToDistribute = (1 << tableLog) - distributed;
-	}
-
-	if (distributed == maxSymbolValue + 1) {
-		/* all values are pretty poor;
-		   probably incompressible data (should have already been detected);
-		   find max, then give all remaining points to max */
-		U32 maxV = 0, maxC = 0;
-		for (s = 0; s <= maxSymbolValue; s++)
-			if (count[s] > maxC)
-				maxV = s, maxC = count[s];
-		norm[maxV] += (short)ToDistribute;
-		return 0;
-	}
-
-	if (total == 0) {
-		/* all of the symbols were low enough for the lowOne or lowThreshold */
-		for (s = 0; ToDistribute > 0; s = (s + 1) % (maxSymbolValue + 1))
-			if (norm[s] > 0)
-				ToDistribute--, norm[s]++;
-		return 0;
-	}
-
-	{
-		U64 const vStepLog = 62 - tableLog;
-		U64 const mid = (1ULL << (vStepLog - 1)) - 1;
-		U64 const rStep = div_u64((((U64)1 << vStepLog) * ToDistribute) + mid, (U32)total); /* scale on remaining */
-		U64 tmpTotal = mid;
-		for (s = 0; s <= maxSymbolValue; s++) {
-			if (norm[s] == NOT_YET_ASSIGNED) {
-				U64 const end = tmpTotal + (count[s] * rStep);
-				U32 const sStart = (U32)(tmpTotal >> vStepLog);
-				U32 const sEnd = (U32)(end >> vStepLog);
-				U32 const weight = sEnd - sStart;
-				if (weight < 1)
-					return ERROR(GENERIC);
-				norm[s] = (short)weight;
-				tmpTotal = end;
-			}
-		}
-	}
-
-	return 0;
-}
-
-size_t FSE_normalizeCount(short *normalizedCounter, unsigned tableLog, const unsigned *count, size_t total, unsigned maxSymbolValue)
-{
-	/* Sanity checks */
-	if (tableLog == 0)
-		tableLog = FSE_DEFAULT_TABLELOG;
-	if (tableLog < FSE_MIN_TABLELOG)
-		return ERROR(GENERIC); /* Unsupported size */
-	if (tableLog > FSE_MAX_TABLELOG)
-		return ERROR(tableLog_tooLarge); /* Unsupported size */
-	if (tableLog < FSE_minTableLog(total, maxSymbolValue))
-		return ERROR(GENERIC); /* Too small tableLog, compression potentially impossible */
-
-	{
-		U32 const rtbTable[] = {0, 473195, 504333, 520860, 550000, 700000, 750000, 830000};
-		U64 const scale = 62 - tableLog;
-		U64 const step = div_u64((U64)1 << 62, (U32)total); /* <== here, one division ! */
-		U64 const vStep = 1ULL << (scale - 20);
-		int stillToDistribute = 1 << tableLog;
-		unsigned s;
-		unsigned largest = 0;
-		short largestP = 0;
-		U32 lowThreshold = (U32)(total >> tableLog);
-
-		for (s = 0; s <= maxSymbolValue; s++) {
-			if (count[s] == total)
-				return 0; /* rle special case */
-			if (count[s] == 0) {
-				normalizedCounter[s] = 0;
-				continue;
-			}
-			if (count[s] <= lowThreshold) {
-				normalizedCounter[s] = -1;
-				stillToDistribute--;
-			} else {
-				short proba = (short)((count[s] * step) >> scale);
-				if (proba < 8) {
-					U64 restToBeat = vStep * rtbTable[proba];
-					proba += (count[s] * step) - ((U64)proba << scale) > restToBeat;
-				}
-				if (proba > largestP)
-					largestP = proba, largest = s;
-				normalizedCounter[s] = proba;
-				stillToDistribute -= proba;
-			}
-		}
-		if (-stillToDistribute >= (normalizedCounter[largest] >> 1)) {
-			/* corner case, need another normalization method */
-			size_t const errorCode = FSE_normalizeM2(normalizedCounter, tableLog, count, total, maxSymbolValue);
-			if (FSE_isError(errorCode))
-				return errorCode;
-		} else
-			normalizedCounter[largest] += (short)stillToDistribute;
-	}
-
-	return tableLog;
-}
-
-/* fake FSE_CTable, for raw (uncompressed) input */
-size_t FSE_buildCTable_raw(FSE_CTable *ct, unsigned nbBits)
-{
-	const unsigned tableSize = 1 << nbBits;
-	const unsigned tableMask = tableSize - 1;
-	const unsigned maxSymbolValue = tableMask;
-	void *const ptr = ct;
-	U16 *const tableU16 = ((U16 *)ptr) + 2;
-	void *const FSCT = ((U32 *)ptr) + 1 /* header */ + (tableSize >> 1); /* assumption : tableLog >= 1 */
-	FSE_symbolCompressionTransform *const symbolTT = (FSE_symbolCompressionTransform *)(FSCT);
-	unsigned s;
-
-	/* Sanity checks */
-	if (nbBits < 1)
-		return ERROR(GENERIC); /* min size */
-
-	/* header */
-	tableU16[-2] = (U16)nbBits;
-	tableU16[-1] = (U16)maxSymbolValue;
-
-	/* Build table */
-	for (s = 0; s < tableSize; s++)
-		tableU16[s] = (U16)(tableSize + s);
-
-	/* Build Symbol Transformation Table */
-	{
-		const U32 deltaNbBits = (nbBits << 16) - (1 << nbBits);
-		for (s = 0; s <= maxSymbolValue; s++) {
-			symbolTT[s].deltaNbBits = deltaNbBits;
-			symbolTT[s].deltaFindState = s - 1;
-		}
-	}
-
-	return 0;
-}
-
-/* fake FSE_CTable, for rle input (always same symbol) */
-size_t FSE_buildCTable_rle(FSE_CTable *ct, BYTE symbolValue)
-{
-	void *ptr = ct;
-	U16 *tableU16 = ((U16 *)ptr) + 2;
-	void *FSCTptr = (U32 *)ptr + 2;
-	FSE_symbolCompressionTransform *symbolTT = (FSE_symbolCompressionTransform *)FSCTptr;
-
-	/* header */
-	tableU16[-2] = (U16)0;
-	tableU16[-1] = (U16)symbolValue;
-
-	/* Build table */
-	tableU16[0] = 0;
-	tableU16[1] = 0; /* just in case */
-
-	/* Build Symbol Transformation Table */
-	symbolTT[symbolValue].deltaNbBits = 0;
-	symbolTT[symbolValue].deltaFindState = 0;
-
-	return 0;
-}
-
-static size_t FSE_compress_usingCTable_generic(void *dst, size_t dstSize, const void *src, size_t srcSize, const FSE_CTable *ct, const unsigned fast)
-{
-	const BYTE *const istart = (const BYTE *)src;
-	const BYTE *const iend = istart + srcSize;
-	const BYTE *ip = iend;
-
-	BIT_CStream_t bitC;
-	FSE_CState_t CState1, CState2;
-
-	/* init */
-	if (srcSize <= 2)
-		return 0;
-	{
-		size_t const initError = BIT_initCStream(&bitC, dst, dstSize);
-		if (FSE_isError(initError))
-			return 0; /* not enough space available to write a bitstream */
-	}
-
-#define FSE_FLUSHBITS(s) (fast ? BIT_flushBitsFast(s) : BIT_flushBits(s))
-
-	if (srcSize & 1) {
-		FSE_initCState2(&CState1, ct, *--ip);
-		FSE_initCState2(&CState2, ct, *--ip);
-		FSE_encodeSymbol(&bitC, &CState1, *--ip);
-		FSE_FLUSHBITS(&bitC);
-	} else {
-		FSE_initCState2(&CState2, ct, *--ip);
-		FSE_initCState2(&CState1, ct, *--ip);
-	}
-
-	/* join to mod 4 */
-	srcSize -= 2;
-	if ((sizeof(bitC.bitContainer) * 8 > FSE_MAX_TABLELOG * 4 + 7) && (srcSize & 2)) { /* test bit 2 */
-		FSE_encodeSymbol(&bitC, &CState2, *--ip);
-		FSE_encodeSymbol(&bitC, &CState1, *--ip);
-		FSE_FLUSHBITS(&bitC);
-	}
-
-	/* 2 or 4 encoding per loop */
-	while (ip > istart) {
-
-		FSE_encodeSymbol(&bitC, &CState2, *--ip);
-
-		if (sizeof(bitC.bitContainer) * 8 < FSE_MAX_TABLELOG * 2 + 7) /* this test must be static */
-			FSE_FLUSHBITS(&bitC);
-
-		FSE_encodeSymbol(&bitC, &CState1, *--ip);
-
-		if (sizeof(bitC.bitContainer) * 8 > FSE_MAX_TABLELOG * 4 + 7) { /* this test must be static */
-			FSE_encodeSymbol(&bitC, &CState2, *--ip);
-			FSE_encodeSymbol(&bitC, &CState1, *--ip);
-		}
-
-		FSE_FLUSHBITS(&bitC);
-	}
-
-	FSE_flushCState(&bitC, &CState2);
-	FSE_flushCState(&bitC, &CState1);
-	return BIT_closeCStream(&bitC);
-}
-
-size_t FSE_compress_usingCTable(void *dst, size_t dstSize, const void *src, size_t srcSize, const FSE_CTable *ct)
-{
-	unsigned const fast = (dstSize >= FSE_BLOCKBOUND(srcSize));
-
-	if (fast)
-		return FSE_compress_usingCTable_generic(dst, dstSize, src, srcSize, ct, 1);
-	else
-		return FSE_compress_usingCTable_generic(dst, dstSize, src, srcSize, ct, 0);
-}
-
-size_t FSE_compressBound(size_t size) { return FSE_COMPRESSBOUND(size); }
@@ -1,332 +0,0 @@
-/*
- * FSE : Finite State Entropy decoder
- * Copyright (C) 2013-2015, Yann Collet.
- *
- * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *   * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *   * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- *
- * You can contact the author at :
- * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy
- */
-
-/* **************************************************************
-*  Compiler specifics
-****************************************************************/
-#define FORCE_INLINE static __always_inline
-
-/* **************************************************************
-*  Includes
-****************************************************************/
-#include "bitstream.h"
-#include "fse.h"
-#include <linux/compiler.h>
-#include <linux/kernel.h>
-#include <linux/string.h> /* memcpy, memset */
-
-/* **************************************************************
-*  Error Management
-****************************************************************/
-#define FSE_isError ERR_isError
-#define FSE_STATIC_ASSERT(c)                                   \
-	{                                                      \
-		enum { FSE_static_assert = 1 / (int)(!!(c)) }; \
-	} /* use only *after* variable declarations */
-
-/* check and forward error code */
-#define CHECK_F(f)                  \
-	{                           \
-		size_t const e = f; \
-		if (FSE_isError(e)) \
-			return e;   \
-	}
-
-/* **************************************************************
-*  Templates
-****************************************************************/
-/*
-  designed to be included
-  for type-specific functions (template emulation in C)
-  Objective is to write these functions only once, for improved maintenance
-*/
-
-/* safety checks */
-#ifndef FSE_FUNCTION_EXTENSION
-#error "FSE_FUNCTION_EXTENSION must be defined"
-#endif
-#ifndef FSE_FUNCTION_TYPE
-#error "FSE_FUNCTION_TYPE must be defined"
-#endif
-
-/* Function names */
-#define FSE_CAT(X, Y) X##Y
-#define FSE_FUNCTION_NAME(X, Y) FSE_CAT(X, Y)
-#define FSE_TYPE_NAME(X, Y) FSE_CAT(X, Y)
-
-/* Function templates */
-
-size_t FSE_buildDTable_wksp(FSE_DTable *dt, const short *normalizedCounter, unsigned maxSymbolValue, unsigned tableLog, void *workspace, size_t workspaceSize)
-{
-	void *const tdPtr = dt + 1; /* because *dt is unsigned, 32-bits aligned on 32-bits */
-	FSE_DECODE_TYPE *const tableDecode = (FSE_DECODE_TYPE *)(tdPtr);
-	U16 *symbolNext = (U16 *)workspace;
-
-	U32 const maxSV1 = maxSymbolValue + 1;
-	U32 const tableSize = 1 << tableLog;
-	U32 highThreshold = tableSize - 1;
-
-	/* Sanity Checks */
-	if (workspaceSize < sizeof(U16) * (FSE_MAX_SYMBOL_VALUE + 1))
-		return ERROR(tableLog_tooLarge);
-	if (maxSymbolValue > FSE_MAX_SYMBOL_VALUE)
-		return ERROR(maxSymbolValue_tooLarge);
-	if (tableLog > FSE_MAX_TABLELOG)
-		return ERROR(tableLog_tooLarge);
-
-	/* Init, lay down lowprob symbols */
-	{
-		FSE_DTableHeader DTableH;
-		DTableH.tableLog = (U16)tableLog;
-		DTableH.fastMode = 1;
-		{
-			S16 const largeLimit = (S16)(1 << (tableLog - 1));
-			U32 s;
-			for (s = 0; s < maxSV1; s++) {
-				if (normalizedCounter[s] == -1) {
-					tableDecode[highThreshold--].symbol = (FSE_FUNCTION_TYPE)s;
-					symbolNext[s] = 1;
-				} else {
-					if (normalizedCounter[s] >= largeLimit)
-						DTableH.fastMode = 0;
-					symbolNext[s] = normalizedCounter[s];
-				}
-			}
-		}
-		memcpy(dt, &DTableH, sizeof(DTableH));
-	}
-
-	/* Spread symbols */
-	{
-		U32 const tableMask = tableSize - 1;
-		U32 const step = FSE_TABLESTEP(tableSize);
-		U32 s, position = 0;
-		for (s = 0; s < maxSV1; s++) {
-			int i;
-			for (i = 0; i < normalizedCounter[s]; i++) {
-				tableDecode[position].symbol = (FSE_FUNCTION_TYPE)s;
-				position = (position + step) & tableMask;
-				while (position > highThreshold)
-					position = (position + step) & tableMask; /* lowprob area */
-			}
-		}
-		if (position != 0)
-			return ERROR(GENERIC); /* position must reach all cells once, otherwise normalizedCounter is incorrect */
-	}
-
-	/* Build Decoding table */
-	{
-		U32 u;
-		for (u = 0; u < tableSize; u++) {
-			FSE_FUNCTION_TYPE const symbol = (FSE_FUNCTION_TYPE)(tableDecode[u].symbol);
-			U16 nextState = symbolNext[symbol]++;
-			tableDecode[u].nbBits = (BYTE)(tableLog - BIT_highbit32((U32)nextState));
-			tableDecode[u].newState = (U16)((nextState << tableDecode[u].nbBits) - tableSize);
-		}
-	}
-
-	return 0;
-}
-
-/*-*******************************************************
-*  Decompression (Byte symbols)
-*********************************************************/
-size_t FSE_buildDTable_rle(FSE_DTable *dt, BYTE symbolValue)
-{
-	void *ptr = dt;
-	FSE_DTableHeader *const DTableH = (FSE_DTableHeader *)ptr;
-	void *dPtr = dt + 1;
-	FSE_decode_t *const cell = (FSE_decode_t *)dPtr;
-
-	DTableH->tableLog = 0;
-	DTableH->fastMode = 0;
-
-	cell->newState = 0;
-	cell->symbol = symbolValue;
-	cell->nbBits = 0;
-
-	return 0;
-}
-
-size_t FSE_buildDTable_raw(FSE_DTable *dt, unsigned nbBits)
-{
-	void *ptr = dt;
-	FSE_DTableHeader *const DTableH = (FSE_DTableHeader *)ptr;
-	void *dPtr = dt + 1;
-	FSE_decode_t *const dinfo = (FSE_decode_t *)dPtr;
-	const unsigned tableSize = 1 << nbBits;
-	const unsigned tableMask = tableSize - 1;
-	const unsigned maxSV1 = tableMask + 1;
-	unsigned s;
-
-	/* Sanity checks */
-	if (nbBits < 1)
-		return ERROR(GENERIC); /* min size */
-
-	/* Build Decoding Table */
-	DTableH->tableLog = (U16)nbBits;
-	DTableH->fastMode = 1;
-	for (s = 0; s < maxSV1; s++) {
-		dinfo[s].newState = 0;
-		dinfo[s].symbol = (BYTE)s;
-		dinfo[s].nbBits = (BYTE)nbBits;
-	}
-
-	return 0;
-}
-
-FORCE_INLINE size_t FSE_decompress_usingDTable_generic(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize, const FSE_DTable *dt,
-						       const unsigned fast)
-{
-	BYTE *const ostart = (BYTE *)dst;
-	BYTE *op = ostart;
-	BYTE *const omax = op + maxDstSize;
-	BYTE *const olimit = omax - 3;
-
-	BIT_DStream_t bitD;
-	FSE_DState_t state1;
-	FSE_DState_t state2;
-
-	/* Init */
-	CHECK_F(BIT_initDStream(&bitD, cSrc, cSrcSize));
-
-	FSE_initDState(&state1, &bitD, dt);
-	FSE_initDState(&state2, &bitD, dt);
-
-#define FSE_GETSYMBOL(statePtr) fast ? FSE_decodeSymbolFast(statePtr, &bitD) : FSE_decodeSymbol(statePtr, &bitD)
-
-	/* 4 symbols per loop */
-	for (; (BIT_reloadDStream(&bitD) == BIT_DStream_unfinished) & (op < olimit); op += 4) {
-		op[0] = FSE_GETSYMBOL(&state1);
-
-		if (FSE_MAX_TABLELOG * 2 + 7 > sizeof(bitD.bitContainer) * 8) /* This test must be static */
-			BIT_reloadDStream(&bitD);
-
-		op[1] = FSE_GETSYMBOL(&state2);
-
-		if (FSE_MAX_TABLELOG * 4 + 7 > sizeof(bitD.bitContainer) * 8) /* This test must be static */
-		{
-			if (BIT_reloadDStream(&bitD) > BIT_DStream_unfinished) {
-				op += 2;
-				break;
-			}
-		}
-
-		op[2] = FSE_GETSYMBOL(&state1);
-
-		if (FSE_MAX_TABLELOG * 2 + 7 > sizeof(bitD.bitContainer) * 8) /* This test must be static */
-			BIT_reloadDStream(&bitD);
-
-		op[3] = FSE_GETSYMBOL(&state2);
-	}
-
-	/* tail */
-	/* note : BIT_reloadDStream(&bitD) >= FSE_DStream_partiallyFilled; Ends at exactly BIT_DStream_completed */
-	while (1) {
-		if (op > (omax - 2))
-			return ERROR(dstSize_tooSmall);
-		*op++ = FSE_GETSYMBOL(&state1);
-		if (BIT_reloadDStream(&bitD) == BIT_DStream_overflow) {
-			*op++ = FSE_GETSYMBOL(&state2);
-			break;
-		}
-
-		if (op > (omax - 2))
-			return ERROR(dstSize_tooSmall);
-		*op++ = FSE_GETSYMBOL(&state2);
-		if (BIT_reloadDStream(&bitD) == BIT_DStream_overflow) {
-			*op++ = FSE_GETSYMBOL(&state1);
-			break;
-		}
-	}
-
-	return op - ostart;
-}
-
-size_t FSE_decompress_usingDTable(void *dst, size_t originalSize, const void *cSrc, size_t cSrcSize, const FSE_DTable *dt)
-{
-	const void *ptr = dt;
-	const FSE_DTableHeader *DTableH = (const FSE_DTableHeader *)ptr;
-	const U32 fastMode = DTableH->fastMode;
-
-	/* select fast mode (static) */
-	if (fastMode)
-		return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 1);
-	return FSE_decompress_usingDTable_generic(dst, originalSize, cSrc, cSrcSize, dt, 0);
-}
-
-size_t FSE_decompress_wksp(void *dst, size_t dstCapacity, const void *cSrc, size_t cSrcSize, unsigned maxLog, void *workspace, size_t workspaceSize)
-{
-	const BYTE *const istart = (const BYTE *)cSrc;
-	const BYTE *ip = istart;
-	unsigned tableLog;
-	unsigned maxSymbolValue = FSE_MAX_SYMBOL_VALUE;
-	size_t NCountLength;
-
-	FSE_DTable *dt;
-	short *counting;
-	size_t spaceUsed32 = 0;
-
-	FSE_STATIC_ASSERT(sizeof(FSE_DTable) == sizeof(U32));
-
-	dt = (FSE_DTable *)((U32 *)workspace + spaceUsed32);
-	spaceUsed32 += FSE_DTABLE_SIZE_U32(maxLog);
-	counting = (short *)((U32 *)workspace + spaceUsed32);
-	spaceUsed32 += ALIGN(sizeof(short) * (FSE_MAX_SYMBOL_VALUE + 1), sizeof(U32)) >> 2;
-
-	if ((spaceUsed32 << 2) > workspaceSize)
-		return ERROR(tableLog_tooLarge);
-	workspace = (U32 *)workspace + spaceUsed32;
-	workspaceSize -= (spaceUsed32 << 2);
-
-	/* normal FSE decoding mode */
-	NCountLength = FSE_readNCount(counting, &maxSymbolValue, &tableLog, istart, cSrcSize);
-	if (FSE_isError(NCountLength))
-		return NCountLength;
-	// if (NCountLength >= cSrcSize) return ERROR(srcSize_wrong);   /* too small input size; supposed to be already checked in NCountLength, only remaining
-	// case : NCountLength==cSrcSize */
-	if (tableLog > maxLog)
-		return ERROR(tableLog_tooLarge);
-	ip += NCountLength;
-	cSrcSize -= NCountLength;
-
-	CHECK_F(FSE_buildDTable_wksp(dt, counting, maxSymbolValue, tableLog, workspace, workspaceSize));
-
-	return FSE_decompress_usingDTable(dst, dstCapacity, ip, cSrcSize, dt); /* always return, even if it is an error code */
-}
@@ -1,212 +0,0 @@
-/*
- * Huffman coder, part of New Generation Entropy library
- * header file
- * Copyright (C) 2013-2016, Yann Collet.
- *
- * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *   * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *   * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- *
- * You can contact the author at :
- * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy
- */
-#ifndef HUF_H_298734234
-#define HUF_H_298734234
-
-/* *** Dependencies *** */
-#include <linux/types.h> /* size_t */
-
-/* ***   Tool functions *** */
-#define HUF_BLOCKSIZE_MAX (128 * 1024) /**< maximum input size for a single block compressed with HUF_compress */
-size_t HUF_compressBound(size_t size); /**< maximum compressed size (worst case) */
-
-/* Error Management */
-unsigned HUF_isError(size_t code); /**< tells if a return value is an error code */
-
-/* ***   Advanced function   *** */
-
-/** HUF_compress4X_wksp() :
-*   Same as HUF_compress2(), but uses externally allocated `workSpace`, which must be a table of >= 1024 unsigned */
-size_t HUF_compress4X_wksp(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void *workSpace,
-			   size_t wkspSize); /**< `workSpace` must be a table of at least HUF_COMPRESS_WORKSPACE_SIZE_U32 unsigned */
-
-/* *** Dependencies *** */
-#include "mem.h" /* U32 */
-
-/* *** Constants *** */
-#define HUF_TABLELOG_MAX 12     /* max configured tableLog (for static allocation); can be modified up to HUF_ABSOLUTEMAX_TABLELOG */
-#define HUF_TABLELOG_DEFAULT 11 /* tableLog by default, when not specified */
-#define HUF_SYMBOLVALUE_MAX 255
-
-#define HUF_TABLELOG_ABSOLUTEMAX 15 /* absolute limit of HUF_MAX_TABLELOG. Beyond that value, code does not work */
-#if (HUF_TABLELOG_MAX > HUF_TABLELOG_ABSOLUTEMAX)
-#error "HUF_TABLELOG_MAX is too large !"
-#endif
-
-/* ****************************************
-*  Static allocation
-******************************************/
-/* HUF buffer bounds */
-#define HUF_CTABLEBOUND 129
-#define HUF_BLOCKBOUND(size) (size + (size >> 8) + 8)			 /* only true if incompressible pre-filtered with fast heuristic */
-#define HUF_COMPRESSBOUND(size) (HUF_CTABLEBOUND + HUF_BLOCKBOUND(size)) /* Macro version, useful for static allocation */
-
-/* static allocation of HUF's Compression Table */
-#define HUF_CREATE_STATIC_CTABLE(name, maxSymbolValue) \
-	U32 name##hb[maxSymbolValue + 1];              \
-	void *name##hv = &(name##hb);                  \
-	HUF_CElt *name = (HUF_CElt *)(name##hv) /* no final ; */
-
-/* static allocation of HUF's DTable */
-typedef U32 HUF_DTable;
-#define HUF_DTABLE_SIZE(maxTableLog) (1 + (1 << (maxTableLog)))
-#define HUF_CREATE_STATIC_DTABLEX2(DTable, maxTableLog) HUF_DTable DTable[HUF_DTABLE_SIZE((maxTableLog)-1)] = {((U32)((maxTableLog)-1) * 0x01000001)}
-#define HUF_CREATE_STATIC_DTABLEX4(DTable, maxTableLog) HUF_DTable DTable[HUF_DTABLE_SIZE(maxTableLog)] = {((U32)(maxTableLog)*0x01000001)}
-
-/* The workspace must have alignment at least 4 and be at least this large */
-#define HUF_COMPRESS_WORKSPACE_SIZE (6 << 10)
-#define HUF_COMPRESS_WORKSPACE_SIZE_U32 (HUF_COMPRESS_WORKSPACE_SIZE / sizeof(U32))
-
-/* The workspace must have alignment at least 4 and be at least this large */
-#define HUF_DECOMPRESS_WORKSPACE_SIZE (3 << 10)
-#define HUF_DECOMPRESS_WORKSPACE_SIZE_U32 (HUF_DECOMPRESS_WORKSPACE_SIZE / sizeof(U32))
-
-/* ****************************************
-*  Advanced decompression functions
-******************************************/
-size_t HUF_decompress4X_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace, size_t workspaceSize); /**< decodes RLE and uncompressed */
-size_t HUF_decompress4X_hufOnly_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace,
-				size_t workspaceSize);							       /**< considers RLE and uncompressed as errors */
-size_t HUF_decompress4X2_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace,
-				   size_t workspaceSize); /**< single-symbol decoder */
-size_t HUF_decompress4X4_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace,
-				   size_t workspaceSize); /**< double-symbols decoder */
-
-/* ****************************************
-*  HUF detailed API
-******************************************/
-/*!
-HUF_compress() does the following:
-1. count symbol occurrence from source[] into table count[] using FSE_count()
-2. (optional) refine tableLog using HUF_optimalTableLog()
-3. build Huffman table from count using HUF_buildCTable()
-4. save Huffman table to memory buffer using HUF_writeCTable_wksp()
-5. encode the data stream using HUF_compress4X_usingCTable()
-
-The following API allows targeting specific sub-functions for advanced tasks.
-For example, it's possible to compress several blocks using the same 'CTable',
-or to save and regenerate 'CTable' using external methods.
-*/
-/* FSE_count() : find it within "fse.h" */
-unsigned HUF_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue);
-typedef struct HUF_CElt_s HUF_CElt; /* incomplete type */
-size_t HUF_writeCTable_wksp(void *dst, size_t maxDstSize, const HUF_CElt *CTable, unsigned maxSymbolValue, unsigned huffLog, void *workspace, size_t workspaceSize);
-size_t HUF_compress4X_usingCTable(void *dst, size_t dstSize, const void *src, size_t srcSize, const HUF_CElt *CTable);
-
-typedef enum {
-	HUF_repeat_none,  /**< Cannot use the previous table */
-	HUF_repeat_check, /**< Can use the previous table but it must be checked. Note : The previous table must have been constructed by HUF_compress{1,
-			     4}X_repeat */
-	HUF_repeat_valid  /**< Can use the previous table and it is assumed to be valid */
-} HUF_repeat;
-/** HUF_compress4X_repeat() :
-*   Same as HUF_compress4X_wksp(), but considers using hufTable if *repeat != HUF_repeat_none.
-*   If it uses hufTable it does not modify hufTable or repeat.
-*   If it doesn't, it sets *repeat = HUF_repeat_none, and it sets hufTable to the table used.
-*   If preferRepeat then the old table will always be used if valid. */
-size_t HUF_compress4X_repeat(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void *workSpace,
-			     size_t wkspSize, HUF_CElt *hufTable, HUF_repeat *repeat,
-			     int preferRepeat); /**< `workSpace` must be a table of at least HUF_COMPRESS_WORKSPACE_SIZE_U32 unsigned */
-
-/** HUF_buildCTable_wksp() :
- *  Same as HUF_buildCTable(), but using externally allocated scratch buffer.
- *  `workSpace` must be aligned on 4-bytes boundaries, and be at least as large as a table of 1024 unsigned.
- */
-size_t HUF_buildCTable_wksp(HUF_CElt *tree, const U32 *count, U32 maxSymbolValue, U32 maxNbBits, void *workSpace, size_t wkspSize);
-
-/*! HUF_readStats() :
-	Read compact Huffman tree, saved by HUF_writeCTable().
-	`huffWeight` is destination buffer.
-	@return : size read from `src` , or an error Code .
-	Note : Needed by HUF_readCTable() and HUF_readDTableXn() . */
-size_t HUF_readStats_wksp(BYTE *huffWeight, size_t hwSize, U32 *rankStats, U32 *nbSymbolsPtr, U32 *tableLogPtr, const void *src, size_t srcSize,
-			  void *workspace, size_t workspaceSize);
-
-/** HUF_readCTable() :
-*   Loading a CTable saved with HUF_writeCTable() */
-size_t HUF_readCTable_wksp(HUF_CElt *CTable, unsigned maxSymbolValue, const void *src, size_t srcSize, void *workspace, size_t workspaceSize);
-
-/*
-HUF_decompress() does the following:
-1. select the decompression algorithm (X2, X4) based on pre-computed heuristics
-2. build Huffman table from save, using HUF_readDTableXn()
-3. decode 1 or 4 segments in parallel using HUF_decompressSXn_usingDTable
-*/
-
-/** HUF_selectDecoder() :
-*   Tells which decoder is likely to decode faster,
-*   based on a set of pre-determined metrics.
-*   @return : 0==HUF_decompress4X2, 1==HUF_decompress4X4 .
-*   Assumption : 0 < cSrcSize < dstSize <= 128 KB */
-U32 HUF_selectDecoder(size_t dstSize, size_t cSrcSize);
-
-size_t HUF_readDTableX2_wksp(HUF_DTable *DTable, const void *src, size_t srcSize, void *workspace, size_t workspaceSize);
-size_t HUF_readDTableX4_wksp(HUF_DTable *DTable, const void *src, size_t srcSize, void *workspace, size_t workspaceSize);
-
-size_t HUF_decompress4X_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable);
-size_t HUF_decompress4X2_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable);
-size_t HUF_decompress4X4_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable);
-
-/* single stream variants */
-
-size_t HUF_compress1X_wksp(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void *workSpace,
-			   size_t wkspSize); /**< `workSpace` must be a table of at least HUF_COMPRESS_WORKSPACE_SIZE_U32 unsigned */
-size_t HUF_compress1X_usingCTable(void *dst, size_t dstSize, const void *src, size_t srcSize, const HUF_CElt *CTable);
-/** HUF_compress1X_repeat() :
-*   Same as HUF_compress1X_wksp(), but considers using hufTable if *repeat != HUF_repeat_none.
-*   If it uses hufTable it does not modify hufTable or repeat.
-*   If it doesn't, it sets *repeat = HUF_repeat_none, and it sets hufTable to the table used.
-*   If preferRepeat then the old table will always be used if valid. */
-size_t HUF_compress1X_repeat(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned tableLog, void *workSpace,
-			     size_t wkspSize, HUF_CElt *hufTable, HUF_repeat *repeat,
-			     int preferRepeat); /**< `workSpace` must be a table of at least HUF_COMPRESS_WORKSPACE_SIZE_U32 unsigned */
-
-size_t HUF_decompress1X_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace, size_t workspaceSize);
-size_t HUF_decompress1X2_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace,
-				   size_t workspaceSize); /**< single-symbol decoder */
-size_t HUF_decompress1X4_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace,
-				   size_t workspaceSize); /**< double-symbols decoder */
-
-size_t HUF_decompress1X_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize,
-				    const HUF_DTable *DTable); /**< automatic selection of sing or double symbol decoder, based on DTable */
-size_t HUF_decompress1X2_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable);
-size_t HUF_decompress1X4_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable);
-
-#endif /* HUF_H_298734234 */
@@ -1,770 +0,0 @@
-/*
- * Huffman encoder, part of New Generation Entropy library
- * Copyright (C) 2013-2016, Yann Collet.
- *
- * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *   * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *   * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- *
- * You can contact the author at :
- * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy
- */
-
-/* **************************************************************
-*  Includes
-****************************************************************/
-#include "bitstream.h"
-#include "fse.h" /* header compression */
-#include "huf.h"
-#include <linux/kernel.h>
-#include <linux/string.h> /* memcpy, memset */
-
-/* **************************************************************
-*  Error Management
-****************************************************************/
-#define HUF_STATIC_ASSERT(c)                                   \
-	{                                                      \
-		enum { HUF_static_assert = 1 / (int)(!!(c)) }; \
-	} /* use only *after* variable declarations */
-#define CHECK_V_F(e, f)     \
-	size_t const e = f; \
-	if (ERR_isError(e)) \
-	return f
-#define CHECK_F(f)                        \
-	{                                 \
-		CHECK_V_F(_var_err__, f); \
-	}
-
-/* **************************************************************
-*  Utils
-****************************************************************/
-unsigned HUF_optimalTableLog(unsigned maxTableLog, size_t srcSize, unsigned maxSymbolValue)
-{
-	return FSE_optimalTableLog_internal(maxTableLog, srcSize, maxSymbolValue, 1);
-}
-
-/* *******************************************************
-*  HUF : Huffman block compression
-*********************************************************/
-/* HUF_compressWeights() :
- * Same as FSE_compress(), but dedicated to huff0's weights compression.
- * The use case needs much less stack memory.
- * Note : all elements within weightTable are supposed to be <= HUF_TABLELOG_MAX.
- */
-#define MAX_FSE_TABLELOG_FOR_HUFF_HEADER 6
-size_t HUF_compressWeights_wksp(void *dst, size_t dstSize, const void *weightTable, size_t wtSize, void *workspace, size_t workspaceSize)
-{
-	BYTE *const ostart = (BYTE *)dst;
-	BYTE *op = ostart;
-	BYTE *const oend = ostart + dstSize;
-
-	U32 maxSymbolValue = HUF_TABLELOG_MAX;
-	U32 tableLog = MAX_FSE_TABLELOG_FOR_HUFF_HEADER;
-
-	FSE_CTable *CTable;
-	U32 *count;
-	S16 *norm;
-	size_t spaceUsed32 = 0;
-
-	HUF_STATIC_ASSERT(sizeof(FSE_CTable) == sizeof(U32));
-
-	CTable = (FSE_CTable *)((U32 *)workspace + spaceUsed32);
-	spaceUsed32 += FSE_CTABLE_SIZE_U32(MAX_FSE_TABLELOG_FOR_HUFF_HEADER, HUF_TABLELOG_MAX);
-	count = (U32 *)workspace + spaceUsed32;
-	spaceUsed32 += HUF_TABLELOG_MAX + 1;
-	norm = (S16 *)((U32 *)workspace + spaceUsed32);
-	spaceUsed32 += ALIGN(sizeof(S16) * (HUF_TABLELOG_MAX + 1), sizeof(U32)) >> 2;
-
-	if ((spaceUsed32 << 2) > workspaceSize)
-		return ERROR(tableLog_tooLarge);
-	workspace = (U32 *)workspace + spaceUsed32;
-	workspaceSize -= (spaceUsed32 << 2);
-
-	/* init conditions */
-	if (wtSize <= 1)
-		return 0; /* Not compressible */
-
-	/* Scan input and build symbol stats */
-	{
-		CHECK_V_F(maxCount, FSE_count_simple(count, &maxSymbolValue, weightTable, wtSize));
-		if (maxCount == wtSize)
-			return 1; /* only a single symbol in src : rle */
-		if (maxCount == 1)
-			return 0; /* each symbol present maximum once => not compressible */
-	}
-
-	tableLog = FSE_optimalTableLog(tableLog, wtSize, maxSymbolValue);
-	CHECK_F(FSE_normalizeCount(norm, tableLog, count, wtSize, maxSymbolValue));
-
-	/* Write table description header */
-	{
-		CHECK_V_F(hSize, FSE_writeNCount(op, oend - op, norm, maxSymbolValue, tableLog));
-		op += hSize;
-	}
-
-	/* Compress */
-	CHECK_F(FSE_buildCTable_wksp(CTable, norm, maxSymbolValue, tableLog, workspace, workspaceSize));
-	{
-		CHECK_V_F(cSize, FSE_compress_usingCTable(op, oend - op, weightTable, wtSize, CTable));
-		if (cSize == 0)
-			return 0; /* not enough space for compressed data */
-		op += cSize;
-	}
-
-	return op - ostart;
-}
-
-struct HUF_CElt_s {
-	U16 val;
-	BYTE nbBits;
-}; /* typedef'd to HUF_CElt within "huf.h" */
-
-/*! HUF_writeCTable_wksp() :
-	`CTable` : Huffman tree to save, using huf representation.
-	@return : size of saved CTable */
-size_t HUF_writeCTable_wksp(void *dst, size_t maxDstSize, const HUF_CElt *CTable, U32 maxSymbolValue, U32 huffLog, void *workspace, size_t workspaceSize)
-{
-	BYTE *op = (BYTE *)dst;
-	U32 n;
-
-	BYTE *bitsToWeight;
-	BYTE *huffWeight;
-	size_t spaceUsed32 = 0;
-
-	bitsToWeight = (BYTE *)((U32 *)workspace + spaceUsed32);
-	spaceUsed32 += ALIGN(HUF_TABLELOG_MAX + 1, sizeof(U32)) >> 2;
-	huffWeight = (BYTE *)((U32 *)workspace + spaceUsed32);
-	spaceUsed32 += ALIGN(HUF_SYMBOLVALUE_MAX, sizeof(U32)) >> 2;
-
-	if ((spaceUsed32 << 2) > workspaceSize)
-		return ERROR(tableLog_tooLarge);
-	workspace = (U32 *)workspace + spaceUsed32;
-	workspaceSize -= (spaceUsed32 << 2);
-
-	/* check conditions */
-	if (maxSymbolValue > HUF_SYMBOLVALUE_MAX)
-		return ERROR(maxSymbolValue_tooLarge);
-
-	/* convert to weight */
-	bitsToWeight[0] = 0;
-	for (n = 1; n < huffLog + 1; n++)
-		bitsToWeight[n] = (BYTE)(huffLog + 1 - n);
-	for (n = 0; n < maxSymbolValue; n++)
-		huffWeight[n] = bitsToWeight[CTable[n].nbBits];
-
-	/* attempt weights compression by FSE */
-	{
-		CHECK_V_F(hSize, HUF_compressWeights_wksp(op + 1, maxDstSize - 1, huffWeight, maxSymbolValue, workspace, workspaceSize));
-		if ((hSize > 1) & (hSize < maxSymbolValue / 2)) { /* FSE compressed */
-			op[0] = (BYTE)hSize;
-			return hSize + 1;
-		}
-	}
-
-	/* write raw values as 4-bits (max : 15) */
-	if (maxSymbolValue > (256 - 128))
-		return ERROR(GENERIC); /* should not happen : likely means source cannot be compressed */
-	if (((maxSymbolValue + 1) / 2) + 1 > maxDstSize)
-		return ERROR(dstSize_tooSmall); /* not enough space within dst buffer */
-	op[0] = (BYTE)(128 /*special case*/ + (maxSymbolValue - 1));
-	huffWeight[maxSymbolValue] = 0; /* to be sure it doesn't cause msan issue in final combination */
-	for (n = 0; n < maxSymbolValue; n += 2)
-		op[(n / 2) + 1] = (BYTE)((huffWeight[n] << 4) + huffWeight[n + 1]);
-	return ((maxSymbolValue + 1) / 2) + 1;
-}
-
-size_t HUF_readCTable_wksp(HUF_CElt *CTable, U32 maxSymbolValue, const void *src, size_t srcSize, void *workspace, size_t workspaceSize)
-{
-	U32 *rankVal;
-	BYTE *huffWeight;
-	U32 tableLog = 0;
-	U32 nbSymbols = 0;
-	size_t readSize;
-	size_t spaceUsed32 = 0;
-
-	rankVal = (U32 *)workspace + spaceUsed32;
-	spaceUsed32 += HUF_TABLELOG_ABSOLUTEMAX + 1;
-	huffWeight = (BYTE *)((U32 *)workspace + spaceUsed32);
-	spaceUsed32 += ALIGN(HUF_SYMBOLVALUE_MAX + 1, sizeof(U32)) >> 2;
-
-	if ((spaceUsed32 << 2) > workspaceSize)
-		return ERROR(tableLog_tooLarge);
-	workspace = (U32 *)workspace + spaceUsed32;
-	workspaceSize -= (spaceUsed32 << 2);
-
-	/* get symbol weights */
-	readSize = HUF_readStats_wksp(huffWeight, HUF_SYMBOLVALUE_MAX + 1, rankVal, &nbSymbols, &tableLog, src, srcSize, workspace, workspaceSize);
-	if (ERR_isError(readSize))
-		return readSize;
-
-	/* check result */
-	if (tableLog > HUF_TABLELOG_MAX)
-		return ERROR(tableLog_tooLarge);
-	if (nbSymbols > maxSymbolValue + 1)
-		return ERROR(maxSymbolValue_tooSmall);
-
-	/* Prepare base value per rank */
-	{
-		U32 n, nextRankStart = 0;
-		for (n = 1; n <= tableLog; n++) {
-			U32 curr = nextRankStart;
-			nextRankStart += (rankVal[n] << (n - 1));
-			rankVal[n] = curr;
-		}
-	}
-
-	/* fill nbBits */
-	{
-		U32 n;
-		for (n = 0; n < nbSymbols; n++) {
-			const U32 w = huffWeight[n];
-			CTable[n].nbBits = (BYTE)(tableLog + 1 - w);
-		}
-	}
-
-	/* fill val */
-	{
-		U16 nbPerRank[HUF_TABLELOG_MAX + 2] = {0}; /* support w=0=>n=tableLog+1 */
-		U16 valPerRank[HUF_TABLELOG_MAX + 2] = {0};
-		{
-			U32 n;
-			for (n = 0; n < nbSymbols; n++)
-				nbPerRank[CTable[n].nbBits]++;
-		}
-		/* determine stating value per rank */
-		valPerRank[tableLog + 1] = 0; /* for w==0 */
-		{
-			U16 min = 0;
-			U32 n;
-			for (n = tableLog; n > 0; n--) { /* start at n=tablelog <-> w=1 */
-				valPerRank[n] = min;     /* get starting value within each rank */
-				min += nbPerRank[n];
-				min >>= 1;
-			}
-		}
-		/* assign value within rank, symbol order */
-		{
-			U32 n;
-			for (n = 0; n <= maxSymbolValue; n++)
-				CTable[n].val = valPerRank[CTable[n].nbBits]++;
-		}
-	}
-
-	return readSize;
-}
-
-typedef struct nodeElt_s {
-	U32 count;
-	U16 parent;
-	BYTE byte;
-	BYTE nbBits;
-} nodeElt;
-
-static U32 HUF_setMaxHeight(nodeElt *huffNode, U32 lastNonNull, U32 maxNbBits)
-{
-	const U32 largestBits = huffNode[lastNonNull].nbBits;
-	if (largestBits <= maxNbBits)
-		return largestBits; /* early exit : no elt > maxNbBits */
-
-	/* there are several too large elements (at least >= 2) */
-	{
-		int totalCost = 0;
-		const U32 baseCost = 1 << (largestBits - maxNbBits);
-		U32 n = lastNonNull;
-
-		while (huffNode[n].nbBits > maxNbBits) {
-			totalCost += baseCost - (1 << (largestBits - huffNode[n].nbBits));
-			huffNode[n].nbBits = (BYTE)maxNbBits;
-			n--;
-		} /* n stops at huffNode[n].nbBits <= maxNbBits */
-		while (huffNode[n].nbBits == maxNbBits)
-			n--; /* n end at index of smallest symbol using < maxNbBits */
-
-		/* renorm totalCost */
-		totalCost >>= (largestBits - maxNbBits); /* note : totalCost is necessarily a multiple of baseCost */
-
-		/* repay normalized cost */
-		{
-			U32 const noSymbol = 0xF0F0F0F0;
-			U32 rankLast[HUF_TABLELOG_MAX + 2];
-			int pos;
-
-			/* Get pos of last (smallest) symbol per rank */
-			memset(rankLast, 0xF0, sizeof(rankLast));
-			{
-				U32 currNbBits = maxNbBits;
-				for (pos = n; pos >= 0; pos--) {
-					if (huffNode[pos].nbBits >= currNbBits)
-						continue;
-					currNbBits = huffNode[pos].nbBits; /* < maxNbBits */
-					rankLast[maxNbBits - currNbBits] = pos;
-				}
-			}
-
-			while (totalCost > 0) {
-				U32 nBitsToDecrease = BIT_highbit32(totalCost) + 1;
-				for (; nBitsToDecrease > 1; nBitsToDecrease--) {
-					U32 highPos = rankLast[nBitsToDecrease];
-					U32 lowPos = rankLast[nBitsToDecrease - 1];
-					if (highPos == noSymbol)
-						continue;
-					if (lowPos == noSymbol)
-						break;
-					{
-						U32 const highTotal = huffNode[highPos].count;
-						U32 const lowTotal = 2 * huffNode[lowPos].count;
-						if (highTotal <= lowTotal)
-							break;
-					}
-				}
-				/* only triggered when no more rank 1 symbol left => find closest one (note : there is necessarily at least one !) */
-				/* HUF_MAX_TABLELOG test just to please gcc 5+; but it should not be necessary */
-				while ((nBitsToDecrease <= HUF_TABLELOG_MAX) && (rankLast[nBitsToDecrease] == noSymbol))
-					nBitsToDecrease++;
-				totalCost -= 1 << (nBitsToDecrease - 1);
-				if (rankLast[nBitsToDecrease - 1] == noSymbol)
-					rankLast[nBitsToDecrease - 1] = rankLast[nBitsToDecrease]; /* this rank is no longer empty */
-				huffNode[rankLast[nBitsToDecrease]].nbBits++;
-				if (rankLast[nBitsToDecrease] == 0) /* special case, reached largest symbol */
-					rankLast[nBitsToDecrease] = noSymbol;
-				else {
-					rankLast[nBitsToDecrease]--;
-					if (huffNode[rankLast[nBitsToDecrease]].nbBits != maxNbBits - nBitsToDecrease)
-						rankLast[nBitsToDecrease] = noSymbol; /* this rank is now empty */
-				}
-			} /* while (totalCost > 0) */
-
-			while (totalCost < 0) {		       /* Sometimes, cost correction overshoot */
-				if (rankLast[1] == noSymbol) { /* special case : no rank 1 symbol (using maxNbBits-1); let's create one from largest rank 0
-								  (using maxNbBits) */
-					while (huffNode[n].nbBits == maxNbBits)
-						n--;
-					huffNode[n + 1].nbBits--;
-					rankLast[1] = n + 1;
-					totalCost++;
-					continue;
-				}
-				huffNode[rankLast[1] + 1].nbBits--;
-				rankLast[1]++;
-				totalCost++;
-			}
-		}
-	} /* there are several too large elements (at least >= 2) */
-
-	return maxNbBits;
-}
-
-typedef struct {
-	U32 base;
-	U32 curr;
-} rankPos;
-
-static void HUF_sort(nodeElt *huffNode, const U32 *count, U32 maxSymbolValue)
-{
-	rankPos rank[32];
-	U32 n;
-
-	memset(rank, 0, sizeof(rank));
-	for (n = 0; n <= maxSymbolValue; n++) {
-		U32 r = BIT_highbit32(count[n] + 1);
-		rank[r].base++;
-	}
-	for (n = 30; n > 0; n--)
-		rank[n - 1].base += rank[n].base;
-	for (n = 0; n < 32; n++)
-		rank[n].curr = rank[n].base;
-	for (n = 0; n <= maxSymbolValue; n++) {
-		U32 const c = count[n];
-		U32 const r = BIT_highbit32(c + 1) + 1;
-		U32 pos = rank[r].curr++;
-		while ((pos > rank[r].base) && (c > huffNode[pos - 1].count))
-			huffNode[pos] = huffNode[pos - 1], pos--;
-		huffNode[pos].count = c;
-		huffNode[pos].byte = (BYTE)n;
-	}
-}
-
-/** HUF_buildCTable_wksp() :
- *  Same as HUF_buildCTable(), but using externally allocated scratch buffer.
- *  `workSpace` must be aligned on 4-bytes boundaries, and be at least as large as a table of 1024 unsigned.
- */
-#define STARTNODE (HUF_SYMBOLVALUE_MAX + 1)
-typedef nodeElt huffNodeTable[2 * HUF_SYMBOLVALUE_MAX + 1 + 1];
-size_t HUF_buildCTable_wksp(HUF_CElt *tree, const U32 *count, U32 maxSymbolValue, U32 maxNbBits, void *workSpace, size_t wkspSize)
-{
-	nodeElt *const huffNode0 = (nodeElt *)workSpace;
-	nodeElt *const huffNode = huffNode0 + 1;
-	U32 n, nonNullRank;
-	int lowS, lowN;
-	U16 nodeNb = STARTNODE;
-	U32 nodeRoot;
-
-	/* safety checks */
-	if (wkspSize < sizeof(huffNodeTable))
-		return ERROR(GENERIC); /* workSpace is not large enough */
-	if (maxNbBits == 0)
-		maxNbBits = HUF_TABLELOG_DEFAULT;
-	if (maxSymbolValue > HUF_SYMBOLVALUE_MAX)
-		return ERROR(GENERIC);
-	memset(huffNode0, 0, sizeof(huffNodeTable));
-
-	/* sort, decreasing order */
-	HUF_sort(huffNode, count, maxSymbolValue);
-
-	/* init for parents */
-	nonNullRank = maxSymbolValue;
-	while (huffNode[nonNullRank].count == 0)
-		nonNullRank--;
-	lowS = nonNullRank;
-	nodeRoot = nodeNb + lowS - 1;
-	lowN = nodeNb;
-	huffNode[nodeNb].count = huffNode[lowS].count + huffNode[lowS - 1].count;
-	huffNode[lowS].parent = huffNode[lowS - 1].parent = nodeNb;
-	nodeNb++;
-	lowS -= 2;
-	for (n = nodeNb; n <= nodeRoot; n++)
-		huffNode[n].count = (U32)(1U << 30);
-	huffNode0[0].count = (U32)(1U << 31); /* fake entry, strong barrier */
-
-	/* create parents */
-	while (nodeNb <= nodeRoot) {
-		U32 n1 = (huffNode[lowS].count < huffNode[lowN].count) ? lowS-- : lowN++;
-		U32 n2 = (huffNode[lowS].count < huffNode[lowN].count) ? lowS-- : lowN++;
-		huffNode[nodeNb].count = huffNode[n1].count + huffNode[n2].count;
-		huffNode[n1].parent = huffNode[n2].parent = nodeNb;
-		nodeNb++;
-	}
-
-	/* distribute weights (unlimited tree height) */
-	huffNode[nodeRoot].nbBits = 0;
-	for (n = nodeRoot - 1; n >= STARTNODE; n--)
-		huffNode[n].nbBits = huffNode[huffNode[n].parent].nbBits + 1;
-	for (n = 0; n <= nonNullRank; n++)
-		huffNode[n].nbBits = huffNode[huffNode[n].parent].nbBits + 1;
-
-	/* enforce maxTableLog */
-	maxNbBits = HUF_setMaxHeight(huffNode, nonNullRank, maxNbBits);
-
-	/* fill result into tree (val, nbBits) */
-	{
-		U16 nbPerRank[HUF_TABLELOG_MAX + 1] = {0};
-		U16 valPerRank[HUF_TABLELOG_MAX + 1] = {0};
-		if (maxNbBits > HUF_TABLELOG_MAX)
-			return ERROR(GENERIC); /* check fit into table */
-		for (n = 0; n <= nonNullRank; n++)
-			nbPerRank[huffNode[n].nbBits]++;
-		/* determine stating value per rank */
-		{
-			U16 min = 0;
-			for (n = maxNbBits; n > 0; n--) {
-				valPerRank[n] = min; /* get starting value within each rank */
-				min += nbPerRank[n];
-				min >>= 1;
-			}
-		}
-		for (n = 0; n <= maxSymbolValue; n++)
-			tree[huffNode[n].byte].nbBits = huffNode[n].nbBits; /* push nbBits per symbol, symbol order */
-		for (n = 0; n <= maxSymbolValue; n++)
-			tree[n].val = valPerRank[tree[n].nbBits]++; /* assign value within rank, symbol order */
-	}
-
-	return maxNbBits;
-}
-
-static size_t HUF_estimateCompressedSize(HUF_CElt *CTable, const unsigned *count, unsigned maxSymbolValue)
-{
-	size_t nbBits = 0;
-	int s;
-	for (s = 0; s <= (int)maxSymbolValue; ++s) {
-		nbBits += CTable[s].nbBits * count[s];
-	}
-	return nbBits >> 3;
-}
-
-static int HUF_validateCTable(const HUF_CElt *CTable, const unsigned *count, unsigned maxSymbolValue)
-{
-	int bad = 0;
-	int s;
-	for (s = 0; s <= (int)maxSymbolValue; ++s) {
-		bad |= (count[s] != 0) & (CTable[s].nbBits == 0);
-	}
-	return !bad;
-}
-
-static void HUF_encodeSymbol(BIT_CStream_t *bitCPtr, U32 symbol, const HUF_CElt *CTable)
-{
-	BIT_addBitsFast(bitCPtr, CTable[symbol].val, CTable[symbol].nbBits);
-}
-
-size_t HUF_compressBound(size_t size) { return HUF_COMPRESSBOUND(size); }
-
-#define HUF_FLUSHBITS(s)  BIT_flushBits(s)
-
-#define HUF_FLUSHBITS_1(stream)                                            \
-	if (sizeof((stream)->bitContainer) * 8 < HUF_TABLELOG_MAX * 2 + 7) \
-	HUF_FLUSHBITS(stream)
-
-#define HUF_FLUSHBITS_2(stream)                                            \
-	if (sizeof((stream)->bitContainer) * 8 < HUF_TABLELOG_MAX * 4 + 7) \
-	HUF_FLUSHBITS(stream)
-
-size_t HUF_compress1X_usingCTable(void *dst, size_t dstSize, const void *src, size_t srcSize, const HUF_CElt *CTable)
-{
-	const BYTE *ip = (const BYTE *)src;
-	BYTE *const ostart = (BYTE *)dst;
-	BYTE *const oend = ostart + dstSize;
-	BYTE *op = ostart;
-	size_t n;
-	BIT_CStream_t bitC;
-
-	/* init */
-	if (dstSize < 8)
-		return 0; /* not enough space to compress */
-	{
-		size_t const initErr = BIT_initCStream(&bitC, op, oend - op);
-		if (HUF_isError(initErr))
-			return 0;
-	}
-
-	n = srcSize & ~3; /* join to mod 4 */
-	switch (srcSize & 3) {
-	case 3: HUF_encodeSymbol(&bitC, ip[n + 2], CTable); HUF_FLUSHBITS_2(&bitC);
-	case 2: HUF_encodeSymbol(&bitC, ip[n + 1], CTable); HUF_FLUSHBITS_1(&bitC);
-	case 1: HUF_encodeSymbol(&bitC, ip[n + 0], CTable); HUF_FLUSHBITS(&bitC);
-	case 0:
-	default:;
-	}
-
-	for (; n > 0; n -= 4) { /* note : n&3==0 at this stage */
-		HUF_encodeSymbol(&bitC, ip[n - 1], CTable);
-		HUF_FLUSHBITS_1(&bitC);
-		HUF_encodeSymbol(&bitC, ip[n - 2], CTable);
-		HUF_FLUSHBITS_2(&bitC);
-		HUF_encodeSymbol(&bitC, ip[n - 3], CTable);
-		HUF_FLUSHBITS_1(&bitC);
-		HUF_encodeSymbol(&bitC, ip[n - 4], CTable);
-		HUF_FLUSHBITS(&bitC);
-	}
-
-	return BIT_closeCStream(&bitC);
-}
-
-size_t HUF_compress4X_usingCTable(void *dst, size_t dstSize, const void *src, size_t srcSize, const HUF_CElt *CTable)
-{
-	size_t const segmentSize = (srcSize + 3) / 4; /* first 3 segments */
-	const BYTE *ip = (const BYTE *)src;
-	const BYTE *const iend = ip + srcSize;
-	BYTE *const ostart = (BYTE *)dst;
-	BYTE *const oend = ostart + dstSize;
-	BYTE *op = ostart;
-
-	if (dstSize < 6 + 1 + 1 + 1 + 8)
-		return 0; /* minimum space to compress successfully */
-	if (srcSize < 12)
-		return 0; /* no saving possible : too small input */
-	op += 6;	  /* jumpTable */
-
-	{
-		CHECK_V_F(cSize, HUF_compress1X_usingCTable(op, oend - op, ip, segmentSize, CTable));
-		if (cSize == 0)
-			return 0;
-		ZSTD_writeLE16(ostart, (U16)cSize);
-		op += cSize;
-	}
-
-	ip += segmentSize;
-	{
-		CHECK_V_F(cSize, HUF_compress1X_usingCTable(op, oend - op, ip, segmentSize, CTable));
-		if (cSize == 0)
-			return 0;
-		ZSTD_writeLE16(ostart + 2, (U16)cSize);
-		op += cSize;
-	}
-
-	ip += segmentSize;
-	{
-		CHECK_V_F(cSize, HUF_compress1X_usingCTable(op, oend - op, ip, segmentSize, CTable));
-		if (cSize == 0)
-			return 0;
-		ZSTD_writeLE16(ostart + 4, (U16)cSize);
-		op += cSize;
-	}
-
-	ip += segmentSize;
-	{
-		CHECK_V_F(cSize, HUF_compress1X_usingCTable(op, oend - op, ip, iend - ip, CTable));
-		if (cSize == 0)
-			return 0;
-		op += cSize;
-	}
-
-	return op - ostart;
-}
-
-static size_t HUF_compressCTable_internal(BYTE *const ostart, BYTE *op, BYTE *const oend, const void *src, size_t srcSize, unsigned singleStream,
-					  const HUF_CElt *CTable)
-{
-	size_t const cSize =
-	    singleStream ? HUF_compress1X_usingCTable(op, oend - op, src, srcSize, CTable) : HUF_compress4X_usingCTable(op, oend - op, src, srcSize, CTable);
-	if (HUF_isError(cSize)) {
-		return cSize;
-	}
-	if (cSize == 0) {
-		return 0;
-	} /* uncompressible */
-	op += cSize;
-	/* check compressibility */
-	if ((size_t)(op - ostart) >= srcSize - 1) {
-		return 0;
-	}
-	return op - ostart;
-}
-
-/* `workSpace` must a table of at least 1024 unsigned */
-static size_t HUF_compress_internal(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned huffLog,
-				    unsigned singleStream, void *workSpace, size_t wkspSize, HUF_CElt *oldHufTable, HUF_repeat *repeat, int preferRepeat)
-{
-	BYTE *const ostart = (BYTE *)dst;
-	BYTE *const oend = ostart + dstSize;
-	BYTE *op = ostart;
-
-	U32 *count;
-	size_t const countSize = sizeof(U32) * (HUF_SYMBOLVALUE_MAX + 1);
-	HUF_CElt *CTable;
-	size_t const CTableSize = sizeof(HUF_CElt) * (HUF_SYMBOLVALUE_MAX + 1);
-
-	/* checks & inits */
-	if (wkspSize < sizeof(huffNodeTable) + countSize + CTableSize)
-		return ERROR(GENERIC);
-	if (!srcSize)
-		return 0; /* Uncompressed (note : 1 means rle, so first byte must be correct) */
-	if (!dstSize)
-		return 0; /* cannot fit within dst budget */
-	if (srcSize > HUF_BLOCKSIZE_MAX)
-		return ERROR(srcSize_wrong); /* curr block size limit */
-	if (huffLog > HUF_TABLELOG_MAX)
-		return ERROR(tableLog_tooLarge);
-	if (!maxSymbolValue)
-		maxSymbolValue = HUF_SYMBOLVALUE_MAX;
-	if (!huffLog)
-		huffLog = HUF_TABLELOG_DEFAULT;
-
-	count = (U32 *)workSpace;
-	workSpace = (BYTE *)workSpace + countSize;
-	wkspSize -= countSize;
-	CTable = (HUF_CElt *)workSpace;
-	workSpace = (BYTE *)workSpace + CTableSize;
-	wkspSize -= CTableSize;
-
-	/* Heuristic : If we don't need to check the validity of the old table use the old table for small inputs */
-	if (preferRepeat && repeat && *repeat == HUF_repeat_valid) {
-		return HUF_compressCTable_internal(ostart, op, oend, src, srcSize, singleStream, oldHufTable);
-	}
-
-	/* Scan input and build symbol stats */
-	{
-		CHECK_V_F(largest, FSE_count_wksp(count, &maxSymbolValue, (const BYTE *)src, srcSize, (U32 *)workSpace));
-		if (largest == srcSize) {
-			*ostart = ((const BYTE *)src)[0];
-			return 1;
-		} /* single symbol, rle */
-		if (largest <= (srcSize >> 7) + 1)
-			return 0; /* Fast heuristic : not compressible enough */
-	}
-
-	/* Check validity of previous table */
-	if (repeat && *repeat == HUF_repeat_check && !HUF_validateCTable(oldHufTable, count, maxSymbolValue)) {
-		*repeat = HUF_repeat_none;
-	}
-	/* Heuristic : use existing table for small inputs */
-	if (preferRepeat && repeat && *repeat != HUF_repeat_none) {
-		return HUF_compressCTable_internal(ostart, op, oend, src, srcSize, singleStream, oldHufTable);
-	}
-
-	/* Build Huffman Tree */
-	huffLog = HUF_optimalTableLog(huffLog, srcSize, maxSymbolValue);
-	{
-		CHECK_V_F(maxBits, HUF_buildCTable_wksp(CTable, count, maxSymbolValue, huffLog, workSpace, wkspSize));
-		huffLog = (U32)maxBits;
-		/* Zero the unused symbols so we can check it for validity */
-		memset(CTable + maxSymbolValue + 1, 0, CTableSize - (maxSymbolValue + 1) * sizeof(HUF_CElt));
-	}
-
-	/* Write table description header */
-	{
-		CHECK_V_F(hSize, HUF_writeCTable_wksp(op, dstSize, CTable, maxSymbolValue, huffLog, workSpace, wkspSize));
-		/* Check if using the previous table will be beneficial */
-		if (repeat && *repeat != HUF_repeat_none) {
-			size_t const oldSize = HUF_estimateCompressedSize(oldHufTable, count, maxSymbolValue);
-			size_t const newSize = HUF_estimateCompressedSize(CTable, count, maxSymbolValue);
-			if (oldSize <= hSize + newSize || hSize + 12 >= srcSize) {
-				return HUF_compressCTable_internal(ostart, op, oend, src, srcSize, singleStream, oldHufTable);
-			}
-		}
-		/* Use the new table */
-		if (hSize + 12ul >= srcSize) {
-			return 0;
-		}
-		op += hSize;
-		if (repeat) {
-			*repeat = HUF_repeat_none;
-		}
-		if (oldHufTable) {
-			memcpy(oldHufTable, CTable, CTableSize);
-		} /* Save the new table */
-	}
-	return HUF_compressCTable_internal(ostart, op, oend, src, srcSize, singleStream, CTable);
-}
-
-size_t HUF_compress1X_wksp(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned huffLog, void *workSpace,
-			   size_t wkspSize)
-{
-	return HUF_compress_internal(dst, dstSize, src, srcSize, maxSymbolValue, huffLog, 1 /* single stream */, workSpace, wkspSize, NULL, NULL, 0);
-}
-
-size_t HUF_compress1X_repeat(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned huffLog, void *workSpace,
-			     size_t wkspSize, HUF_CElt *hufTable, HUF_repeat *repeat, int preferRepeat)
-{
-	return HUF_compress_internal(dst, dstSize, src, srcSize, maxSymbolValue, huffLog, 1 /* single stream */, workSpace, wkspSize, hufTable, repeat,
-				     preferRepeat);
-}
-
-size_t HUF_compress4X_wksp(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned huffLog, void *workSpace,
-			   size_t wkspSize)
-{
-	return HUF_compress_internal(dst, dstSize, src, srcSize, maxSymbolValue, huffLog, 0 /* 4 streams */, workSpace, wkspSize, NULL, NULL, 0);
-}
-
-size_t HUF_compress4X_repeat(void *dst, size_t dstSize, const void *src, size_t srcSize, unsigned maxSymbolValue, unsigned huffLog, void *workSpace,
-			     size_t wkspSize, HUF_CElt *hufTable, HUF_repeat *repeat, int preferRepeat)
-{
-	return HUF_compress_internal(dst, dstSize, src, srcSize, maxSymbolValue, huffLog, 0 /* 4 streams */, workSpace, wkspSize, hufTable, repeat,
-				     preferRepeat);
-}
@@ -1,960 +0,0 @@
-/*
- * Huffman decoder, part of New Generation Entropy library
- * Copyright (C) 2013-2016, Yann Collet.
- *
- * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions are
- * met:
- *
- *   * Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *   * Redistributions in binary form must reproduce the above
- * copyright notice, this list of conditions and the following disclaimer
- * in the documentation and/or other materials provided with the
- * distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
- * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
- * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
- * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
- * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
- * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
- * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- *
- * You can contact the author at :
- * - Source repository : https://github.com/Cyan4973/FiniteStateEntropy
- */
-
-/* **************************************************************
-*  Compiler specifics
-****************************************************************/
-#define FORCE_INLINE static __always_inline
-
-/* **************************************************************
-*  Dependencies
-****************************************************************/
-#include "bitstream.h" /* BIT_* */
-#include "fse.h"       /* header compression */
-#include "huf.h"
-#include <linux/compiler.h>
-#include <linux/kernel.h>
-#include <linux/string.h> /* memcpy, memset */
-
-/* **************************************************************
-*  Error Management
-****************************************************************/
-#define HUF_STATIC_ASSERT(c)                                   \
-	{                                                      \
-		enum { HUF_static_assert = 1 / (int)(!!(c)) }; \
-	} /* use only *after* variable declarations */
-
-/*-***************************/
-/*  generic DTableDesc       */
-/*-***************************/
-
-typedef struct {
-	BYTE maxTableLog;
-	BYTE tableType;
-	BYTE tableLog;
-	BYTE reserved;
-} DTableDesc;
-
-static DTableDesc HUF_getDTableDesc(const HUF_DTable *table)
-{
-	DTableDesc dtd;
-	memcpy(&dtd, table, sizeof(dtd));
-	return dtd;
-}
-
-/*-***************************/
-/*  single-symbol decoding   */
-/*-***************************/
-
-typedef struct {
-	BYTE byte;
-	BYTE nbBits;
-} HUF_DEltX2; /* single-symbol decoding */
-
-size_t HUF_readDTableX2_wksp(HUF_DTable *DTable, const void *src, size_t srcSize, void *workspace, size_t workspaceSize)
-{
-	U32 tableLog = 0;
-	U32 nbSymbols = 0;
-	size_t iSize;
-	void *const dtPtr = DTable + 1;
-	HUF_DEltX2 *const dt = (HUF_DEltX2 *)dtPtr;
-
-	U32 *rankVal;
-	BYTE *huffWeight;
-	size_t spaceUsed32 = 0;
-
-	rankVal = (U32 *)workspace + spaceUsed32;
-	spaceUsed32 += HUF_TABLELOG_ABSOLUTEMAX + 1;
-	huffWeight = (BYTE *)((U32 *)workspace + spaceUsed32);
-	spaceUsed32 += ALIGN(HUF_SYMBOLVALUE_MAX + 1, sizeof(U32)) >> 2;
-
-	if ((spaceUsed32 << 2) > workspaceSize)
-		return ERROR(tableLog_tooLarge);
-	workspace = (U32 *)workspace + spaceUsed32;
-	workspaceSize -= (spaceUsed32 << 2);
-
-	HUF_STATIC_ASSERT(sizeof(DTableDesc) == sizeof(HUF_DTable));
-	/* memset(huffWeight, 0, sizeof(huffWeight)); */ /* is not necessary, even though some analyzer complain ... */
-
-	iSize = HUF_readStats_wksp(huffWeight, HUF_SYMBOLVALUE_MAX + 1, rankVal, &nbSymbols, &tableLog, src, srcSize, workspace, workspaceSize);
-	if (HUF_isError(iSize))
-		return iSize;
-
-	/* Table header */
-	{
-		DTableDesc dtd = HUF_getDTableDesc(DTable);
-		if (tableLog > (U32)(dtd.maxTableLog + 1))
-			return ERROR(tableLog_tooLarge); /* DTable too small, Huffman tree cannot fit in */
-		dtd.tableType = 0;
-		dtd.tableLog = (BYTE)tableLog;
-		memcpy(DTable, &dtd, sizeof(dtd));
-	}
-
-	/* Calculate starting value for each rank */
-	{
-		U32 n, nextRankStart = 0;
-		for (n = 1; n < tableLog + 1; n++) {
-			U32 const curr = nextRankStart;
-			nextRankStart += (rankVal[n] << (n - 1));
-			rankVal[n] = curr;
-		}
-	}
-
-	/* fill DTable */
-	{
-		U32 n;
-		for (n = 0; n < nbSymbols; n++) {
-			U32 const w = huffWeight[n];
-			U32 const length = (1 << w) >> 1;
-			U32 u;
-			HUF_DEltX2 D;
-			D.byte = (BYTE)n;
-			D.nbBits = (BYTE)(tableLog + 1 - w);
-			for (u = rankVal[w]; u < rankVal[w] + length; u++)
-				dt[u] = D;
-			rankVal[w] += length;
-		}
-	}
-
-	return iSize;
-}
-
-static BYTE HUF_decodeSymbolX2(BIT_DStream_t *Dstream, const HUF_DEltX2 *dt, const U32 dtLog)
-{
-	size_t const val = BIT_lookBitsFast(Dstream, dtLog); /* note : dtLog >= 1 */
-	BYTE const c = dt[val].byte;
-	BIT_skipBits(Dstream, dt[val].nbBits);
-	return c;
-}
-
-#define HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr) *ptr++ = HUF_decodeSymbolX2(DStreamPtr, dt, dtLog)
-
-#define HUF_DECODE_SYMBOLX2_1(ptr, DStreamPtr)         \
-	if (ZSTD_64bits() || (HUF_TABLELOG_MAX <= 12)) \
-	HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr)
-
-#define HUF_DECODE_SYMBOLX2_2(ptr, DStreamPtr) \
-	if (ZSTD_64bits())                     \
-	HUF_DECODE_SYMBOLX2_0(ptr, DStreamPtr)
-
-FORCE_INLINE size_t HUF_decodeStreamX2(BYTE *p, BIT_DStream_t *const bitDPtr, BYTE *const pEnd, const HUF_DEltX2 *const dt, const U32 dtLog)
-{
-	BYTE *const pStart = p;
-
-	/* up to 4 symbols at a time */
-	while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p <= pEnd - 4)) {
-		HUF_DECODE_SYMBOLX2_2(p, bitDPtr);
-		HUF_DECODE_SYMBOLX2_1(p, bitDPtr);
-		HUF_DECODE_SYMBOLX2_2(p, bitDPtr);
-		HUF_DECODE_SYMBOLX2_0(p, bitDPtr);
-	}
-
-	/* closer to the end */
-	while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) && (p < pEnd))
-		HUF_DECODE_SYMBOLX2_0(p, bitDPtr);
-
-	/* no more data to retrieve from bitstream, hence no need to reload */
-	while (p < pEnd)
-		HUF_DECODE_SYMBOLX2_0(p, bitDPtr);
-
-	return pEnd - pStart;
-}
-
-static size_t HUF_decompress1X2_usingDTable_internal(void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable)
-{
-	BYTE *op = (BYTE *)dst;
-	BYTE *const oend = op + dstSize;
-	const void *dtPtr = DTable + 1;
-	const HUF_DEltX2 *const dt = (const HUF_DEltX2 *)dtPtr;
-	BIT_DStream_t bitD;
-	DTableDesc const dtd = HUF_getDTableDesc(DTable);
-	U32 const dtLog = dtd.tableLog;
-
-	{
-		size_t const errorCode = BIT_initDStream(&bitD, cSrc, cSrcSize);
-		if (HUF_isError(errorCode))
-			return errorCode;
-	}
-
-	HUF_decodeStreamX2(op, &bitD, oend, dt, dtLog);
-
-	/* check */
-	if (!BIT_endOfDStream(&bitD))
-		return ERROR(corruption_detected);
-
-	return dstSize;
-}
-
-size_t HUF_decompress1X2_usingDTable(void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable)
-{
-	DTableDesc dtd = HUF_getDTableDesc(DTable);
-	if (dtd.tableType != 0)
-		return ERROR(GENERIC);
-	return HUF_decompress1X2_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable);
-}
-
-size_t HUF_decompress1X2_DCtx_wksp(HUF_DTable *DCtx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace, size_t workspaceSize)
-{
-	const BYTE *ip = (const BYTE *)cSrc;
-
-	size_t const hSize = HUF_readDTableX2_wksp(DCtx, cSrc, cSrcSize, workspace, workspaceSize);
-	if (HUF_isError(hSize))
-		return hSize;
-	if (hSize >= cSrcSize)
-		return ERROR(srcSize_wrong);
-	ip += hSize;
-	cSrcSize -= hSize;
-
-	return HUF_decompress1X2_usingDTable_internal(dst, dstSize, ip, cSrcSize, DCtx);
-}
-
-static size_t HUF_decompress4X2_usingDTable_internal(void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable)
-{
-	/* Check */
-	if (cSrcSize < 10)
-		return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */
-
-	{
-		const BYTE *const istart = (const BYTE *)cSrc;
-		BYTE *const ostart = (BYTE *)dst;
-		BYTE *const oend = ostart + dstSize;
-		const void *const dtPtr = DTable + 1;
-		const HUF_DEltX2 *const dt = (const HUF_DEltX2 *)dtPtr;
-
-		/* Init */
-		BIT_DStream_t bitD1;
-		BIT_DStream_t bitD2;
-		BIT_DStream_t bitD3;
-		BIT_DStream_t bitD4;
-		size_t const length1 = ZSTD_readLE16(istart);
-		size_t const length2 = ZSTD_readLE16(istart + 2);
-		size_t const length3 = ZSTD_readLE16(istart + 4);
-		size_t const length4 = cSrcSize - (length1 + length2 + length3 + 6);
-		const BYTE *const istart1 = istart + 6; /* jumpTable */
-		const BYTE *const istart2 = istart1 + length1;
-		const BYTE *const istart3 = istart2 + length2;
-		const BYTE *const istart4 = istart3 + length3;
-		const size_t segmentSize = (dstSize + 3) / 4;
-		BYTE *const opStart2 = ostart + segmentSize;
-		BYTE *const opStart3 = opStart2 + segmentSize;
-		BYTE *const opStart4 = opStart3 + segmentSize;
-		BYTE *op1 = ostart;
-		BYTE *op2 = opStart2;
-		BYTE *op3 = opStart3;
-		BYTE *op4 = opStart4;
-		U32 endSignal;
-		DTableDesc const dtd = HUF_getDTableDesc(DTable);
-		U32 const dtLog = dtd.tableLog;
-
-		if (length4 > cSrcSize)
-			return ERROR(corruption_detected); /* overflow */
-		{
-			size_t const errorCode = BIT_initDStream(&bitD1, istart1, length1);
-			if (HUF_isError(errorCode))
-				return errorCode;
-		}
-		{
-			size_t const errorCode = BIT_initDStream(&bitD2, istart2, length2);
-			if (HUF_isError(errorCode))
-				return errorCode;
-		}
-		{
-			size_t const errorCode = BIT_initDStream(&bitD3, istart3, length3);
-			if (HUF_isError(errorCode))
-				return errorCode;
-		}
-		{
-			size_t const errorCode = BIT_initDStream(&bitD4, istart4, length4);
-			if (HUF_isError(errorCode))
-				return errorCode;
-		}
-
-		/* 16-32 symbols per loop (4-8 symbols per stream) */
-		endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4);
-		for (; (endSignal == BIT_DStream_unfinished) && (op4 < (oend - 7));) {
-			HUF_DECODE_SYMBOLX2_2(op1, &bitD1);
-			HUF_DECODE_SYMBOLX2_2(op2, &bitD2);
-			HUF_DECODE_SYMBOLX2_2(op3, &bitD3);
-			HUF_DECODE_SYMBOLX2_2(op4, &bitD4);
-			HUF_DECODE_SYMBOLX2_1(op1, &bitD1);
-			HUF_DECODE_SYMBOLX2_1(op2, &bitD2);
-			HUF_DECODE_SYMBOLX2_1(op3, &bitD3);
-			HUF_DECODE_SYMBOLX2_1(op4, &bitD4);
-			HUF_DECODE_SYMBOLX2_2(op1, &bitD1);
-			HUF_DECODE_SYMBOLX2_2(op2, &bitD2);
-			HUF_DECODE_SYMBOLX2_2(op3, &bitD3);
-			HUF_DECODE_SYMBOLX2_2(op4, &bitD4);
-			HUF_DECODE_SYMBOLX2_0(op1, &bitD1);
-			HUF_DECODE_SYMBOLX2_0(op2, &bitD2);
-			HUF_DECODE_SYMBOLX2_0(op3, &bitD3);
-			HUF_DECODE_SYMBOLX2_0(op4, &bitD4);
-			endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4);
-		}
-
-		/* check corruption */
-		if (op1 > opStart2)
-			return ERROR(corruption_detected);
-		if (op2 > opStart3)
-			return ERROR(corruption_detected);
-		if (op3 > opStart4)
-			return ERROR(corruption_detected);
-		/* note : op4 supposed already verified within main loop */
-
-		/* finish bitStreams one by one */
-		HUF_decodeStreamX2(op1, &bitD1, opStart2, dt, dtLog);
-		HUF_decodeStreamX2(op2, &bitD2, opStart3, dt, dtLog);
-		HUF_decodeStreamX2(op3, &bitD3, opStart4, dt, dtLog);
-		HUF_decodeStreamX2(op4, &bitD4, oend, dt, dtLog);
-
-		/* check */
-		endSignal = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4);
-		if (!endSignal)
-			return ERROR(corruption_detected);
-
-		/* decoded size */
-		return dstSize;
-	}
-}
-
-size_t HUF_decompress4X2_usingDTable(void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable)
-{
-	DTableDesc dtd = HUF_getDTableDesc(DTable);
-	if (dtd.tableType != 0)
-		return ERROR(GENERIC);
-	return HUF_decompress4X2_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable);
-}
-
-size_t HUF_decompress4X2_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace, size_t workspaceSize)
-{
-	const BYTE *ip = (const BYTE *)cSrc;
-
-	size_t const hSize = HUF_readDTableX2_wksp(dctx, cSrc, cSrcSize, workspace, workspaceSize);
-	if (HUF_isError(hSize))
-		return hSize;
-	if (hSize >= cSrcSize)
-		return ERROR(srcSize_wrong);
-	ip += hSize;
-	cSrcSize -= hSize;
-
-	return HUF_decompress4X2_usingDTable_internal(dst, dstSize, ip, cSrcSize, dctx);
-}
-
-/* *************************/
-/* double-symbols decoding */
-/* *************************/
-typedef struct {
-	U16 sequence;
-	BYTE nbBits;
-	BYTE length;
-} HUF_DEltX4; /* double-symbols decoding */
-
-typedef struct {
-	BYTE symbol;
-	BYTE weight;
-} sortedSymbol_t;
-
-/* HUF_fillDTableX4Level2() :
- * `rankValOrigin` must be a table of at least (HUF_TABLELOG_MAX + 1) U32 */
-static void HUF_fillDTableX4Level2(HUF_DEltX4 *DTable, U32 sizeLog, const U32 consumed, const U32 *rankValOrigin, const int minWeight,
-				   const sortedSymbol_t *sortedSymbols, const U32 sortedListSize, U32 nbBitsBaseline, U16 baseSeq)
-{
-	HUF_DEltX4 DElt;
-	U32 rankVal[HUF_TABLELOG_MAX + 1];
-
-	/* get pre-calculated rankVal */
-	memcpy(rankVal, rankValOrigin, sizeof(rankVal));
-
-	/* fill skipped values */
-	if (minWeight > 1) {
-		U32 i, skipSize = rankVal[minWeight];
-		ZSTD_writeLE16(&(DElt.sequence), baseSeq);
-		DElt.nbBits = (BYTE)(consumed);
-		DElt.length = 1;
-		for (i = 0; i < skipSize; i++)
-			DTable[i] = DElt;
-	}
-
-	/* fill DTable */
-	{
-		U32 s;
-		for (s = 0; s < sortedListSize; s++) { /* note : sortedSymbols already skipped */
-			const U32 symbol = sortedSymbols[s].symbol;
-			const U32 weight = sortedSymbols[s].weight;
-			const U32 nbBits = nbBitsBaseline - weight;
-			const U32 length = 1 << (sizeLog - nbBits);
-			const U32 start = rankVal[weight];
-			U32 i = start;
-			const U32 end = start + length;
-
-			ZSTD_writeLE16(&(DElt.sequence), (U16)(baseSeq + (symbol << 8)));
-			DElt.nbBits = (BYTE)(nbBits + consumed);
-			DElt.length = 2;
-			do {
-				DTable[i++] = DElt;
-			} while (i < end); /* since length >= 1 */
-
-			rankVal[weight] += length;
-		}
-	}
-}
-
-typedef U32 rankVal_t[HUF_TABLELOG_MAX][HUF_TABLELOG_MAX + 1];
-typedef U32 rankValCol_t[HUF_TABLELOG_MAX + 1];
-
-static void HUF_fillDTableX4(HUF_DEltX4 *DTable, const U32 targetLog, const sortedSymbol_t *sortedList, const U32 sortedListSize, const U32 *rankStart,
-			     rankVal_t rankValOrigin, const U32 maxWeight, const U32 nbBitsBaseline)
-{
-	U32 rankVal[HUF_TABLELOG_MAX + 1];
-	const int scaleLog = nbBitsBaseline - targetLog; /* note : targetLog >= srcLog, hence scaleLog <= 1 */
-	const U32 minBits = nbBitsBaseline - maxWeight;
-	U32 s;
-
-	memcpy(rankVal, rankValOrigin, sizeof(rankVal));
-
-	/* fill DTable */
-	for (s = 0; s < sortedListSize; s++) {
-		const U16 symbol = sortedList[s].symbol;
-		const U32 weight = sortedList[s].weight;
-		const U32 nbBits = nbBitsBaseline - weight;
-		const U32 start = rankVal[weight];
-		const U32 length = 1 << (targetLog - nbBits);
-
-		if (targetLog - nbBits >= minBits) { /* enough room for a second symbol */
-			U32 sortedRank;
-			int minWeight = nbBits + scaleLog;
-			if (minWeight < 1)
-				minWeight = 1;
-			sortedRank = rankStart[minWeight];
-			HUF_fillDTableX4Level2(DTable + start, targetLog - nbBits, nbBits, rankValOrigin[nbBits], minWeight, sortedList + sortedRank,
-					       sortedListSize - sortedRank, nbBitsBaseline, symbol);
-		} else {
-			HUF_DEltX4 DElt;
-			ZSTD_writeLE16(&(DElt.sequence), symbol);
-			DElt.nbBits = (BYTE)(nbBits);
-			DElt.length = 1;
-			{
-				U32 const end = start + length;
-				U32 u;
-				for (u = start; u < end; u++)
-					DTable[u] = DElt;
-			}
-		}
-		rankVal[weight] += length;
-	}
-}
-
-size_t HUF_readDTableX4_wksp(HUF_DTable *DTable, const void *src, size_t srcSize, void *workspace, size_t workspaceSize)
-{
-	U32 tableLog, maxW, sizeOfSort, nbSymbols;
-	DTableDesc dtd = HUF_getDTableDesc(DTable);
-	U32 const maxTableLog = dtd.maxTableLog;
-	size_t iSize;
-	void *dtPtr = DTable + 1; /* force compiler to avoid strict-aliasing */
-	HUF_DEltX4 *const dt = (HUF_DEltX4 *)dtPtr;
-	U32 *rankStart;
-
-	rankValCol_t *rankVal;
-	U32 *rankStats;
-	U32 *rankStart0;
-	sortedSymbol_t *sortedSymbol;
-	BYTE *weightList;
-	size_t spaceUsed32 = 0;
-
-	HUF_STATIC_ASSERT((sizeof(rankValCol_t) & 3) == 0);
-
-	rankVal = (rankValCol_t *)((U32 *)workspace + spaceUsed32);
-	spaceUsed32 += (sizeof(rankValCol_t) * HUF_TABLELOG_MAX) >> 2;
-	rankStats = (U32 *)workspace + spaceUsed32;
-	spaceUsed32 += HUF_TABLELOG_MAX + 1;
-	rankStart0 = (U32 *)workspace + spaceUsed32;
-	spaceUsed32 += HUF_TABLELOG_MAX + 2;
-	sortedSymbol = (sortedSymbol_t *)((U32 *)workspace + spaceUsed32);
-	spaceUsed32 += ALIGN(sizeof(sortedSymbol_t) * (HUF_SYMBOLVALUE_MAX + 1), sizeof(U32)) >> 2;
-	weightList = (BYTE *)((U32 *)workspace + spaceUsed32);
-	spaceUsed32 += ALIGN(HUF_SYMBOLVALUE_MAX + 1, sizeof(U32)) >> 2;
-
-	if ((spaceUsed32 << 2) > workspaceSize)
-		return ERROR(tableLog_tooLarge);
-	workspace = (U32 *)workspace + spaceUsed32;
-	workspaceSize -= (spaceUsed32 << 2);
-
-	rankStart = rankStart0 + 1;
-	memset(rankStats, 0, sizeof(U32) * (2 * HUF_TABLELOG_MAX + 2 + 1));
-
-	HUF_STATIC_ASSERT(sizeof(HUF_DEltX4) == sizeof(HUF_DTable)); /* if compiler fails here, assertion is wrong */
-	if (maxTableLog > HUF_TABLELOG_MAX)
-		return ERROR(tableLog_tooLarge);
-	/* memset(weightList, 0, sizeof(weightList)); */ /* is not necessary, even though some analyzer complain ... */
-
-	iSize = HUF_readStats_wksp(weightList, HUF_SYMBOLVALUE_MAX + 1, rankStats, &nbSymbols, &tableLog, src, srcSize, workspace, workspaceSize);
-	if (HUF_isError(iSize))
-		return iSize;
-
-	/* check result */
-	if (tableLog > maxTableLog)
-		return ERROR(tableLog_tooLarge); /* DTable can't fit code depth */
-
-	/* find maxWeight */
-	for (maxW = tableLog; rankStats[maxW] == 0; maxW--) {
-	} /* necessarily finds a solution before 0 */
-
-	/* Get start index of each weight */
-	{
-		U32 w, nextRankStart = 0;
-		for (w = 1; w < maxW + 1; w++) {
-			U32 curr = nextRankStart;
-			nextRankStart += rankStats[w];
-			rankStart[w] = curr;
-		}
-		rankStart[0] = nextRankStart; /* put all 0w symbols at the end of sorted list*/
-		sizeOfSort = nextRankStart;
-	}
-
-	/* sort symbols by weight */
-	{
-		U32 s;
-		for (s = 0; s < nbSymbols; s++) {
-			U32 const w = weightList[s];
-			U32 const r = rankStart[w]++;
-			sortedSymbol[r].symbol = (BYTE)s;
-			sortedSymbol[r].weight = (BYTE)w;
-		}
-		rankStart[0] = 0; /* forget 0w symbols; this is beginning of weight(1) */
-	}
-
-	/* Build rankVal */
-	{
-		U32 *const rankVal0 = rankVal[0];
-		{
-			int const rescale = (maxTableLog - tableLog) - 1; /* tableLog <= maxTableLog */
-			U32 nextRankVal = 0;
-			U32 w;
-			for (w = 1; w < maxW + 1; w++) {
-				U32 curr = nextRankVal;
-				nextRankVal += rankStats[w] << (w + rescale);
-				rankVal0[w] = curr;
-			}
-		}
-		{
-			U32 const minBits = tableLog + 1 - maxW;
-			U32 consumed;
-			for (consumed = minBits; consumed < maxTableLog - minBits + 1; consumed++) {
-				U32 *const rankValPtr = rankVal[consumed];
-				U32 w;
-				for (w = 1; w < maxW + 1; w++) {
-					rankValPtr[w] = rankVal0[w] >> consumed;
-				}
-			}
-		}
-	}
-
-	HUF_fillDTableX4(dt, maxTableLog, sortedSymbol, sizeOfSort, rankStart0, rankVal, maxW, tableLog + 1);
-
-	dtd.tableLog = (BYTE)maxTableLog;
-	dtd.tableType = 1;
-	memcpy(DTable, &dtd, sizeof(dtd));
-	return iSize;
-}
-
-static U32 HUF_decodeSymbolX4(void *op, BIT_DStream_t *DStream, const HUF_DEltX4 *dt, const U32 dtLog)
-{
-	size_t const val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */
-	memcpy(op, dt + val, 2);
-	BIT_skipBits(DStream, dt[val].nbBits);
-	return dt[val].length;
-}
-
-static U32 HUF_decodeLastSymbolX4(void *op, BIT_DStream_t *DStream, const HUF_DEltX4 *dt, const U32 dtLog)
-{
-	size_t const val = BIT_lookBitsFast(DStream, dtLog); /* note : dtLog >= 1 */
-	memcpy(op, dt + val, 1);
-	if (dt[val].length == 1)
-		BIT_skipBits(DStream, dt[val].nbBits);
-	else {
-		if (DStream->bitsConsumed < (sizeof(DStream->bitContainer) * 8)) {
-			BIT_skipBits(DStream, dt[val].nbBits);
-			if (DStream->bitsConsumed > (sizeof(DStream->bitContainer) * 8))
-				/* ugly hack; works only because it's the last symbol. Note : can't easily extract nbBits from just this symbol */
-				DStream->bitsConsumed = (sizeof(DStream->bitContainer) * 8);
-		}
-	}
-	return 1;
-}
-
-#define HUF_DECODE_SYMBOLX4_0(ptr, DStreamPtr) ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog)
-
-#define HUF_DECODE_SYMBOLX4_1(ptr, DStreamPtr)         \
-	if (ZSTD_64bits() || (HUF_TABLELOG_MAX <= 12)) \
-	ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog)
-
-#define HUF_DECODE_SYMBOLX4_2(ptr, DStreamPtr) \
-	if (ZSTD_64bits())                     \
-	ptr += HUF_decodeSymbolX4(ptr, DStreamPtr, dt, dtLog)
-
-FORCE_INLINE size_t HUF_decodeStreamX4(BYTE *p, BIT_DStream_t *bitDPtr, BYTE *const pEnd, const HUF_DEltX4 *const dt, const U32 dtLog)
-{
-	BYTE *const pStart = p;
-
-	/* up to 8 symbols at a time */
-	while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) & (p < pEnd - (sizeof(bitDPtr->bitContainer) - 1))) {
-		HUF_DECODE_SYMBOLX4_2(p, bitDPtr);
-		HUF_DECODE_SYMBOLX4_1(p, bitDPtr);
-		HUF_DECODE_SYMBOLX4_2(p, bitDPtr);
-		HUF_DECODE_SYMBOLX4_0(p, bitDPtr);
-	}
-
-	/* closer to end : up to 2 symbols at a time */
-	while ((BIT_reloadDStream(bitDPtr) == BIT_DStream_unfinished) & (p <= pEnd - 2))
-		HUF_DECODE_SYMBOLX4_0(p, bitDPtr);
-
-	while (p <= pEnd - 2)
-		HUF_DECODE_SYMBOLX4_0(p, bitDPtr); /* no need to reload : reached the end of DStream */
-
-	if (p < pEnd)
-		p += HUF_decodeLastSymbolX4(p, bitDPtr, dt, dtLog);
-
-	return p - pStart;
-}
-
-static size_t HUF_decompress1X4_usingDTable_internal(void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable)
-{
-	BIT_DStream_t bitD;
-
-	/* Init */
-	{
-		size_t const errorCode = BIT_initDStream(&bitD, cSrc, cSrcSize);
-		if (HUF_isError(errorCode))
-			return errorCode;
-	}
-
-	/* decode */
-	{
-		BYTE *const ostart = (BYTE *)dst;
-		BYTE *const oend = ostart + dstSize;
-		const void *const dtPtr = DTable + 1; /* force compiler to not use strict-aliasing */
-		const HUF_DEltX4 *const dt = (const HUF_DEltX4 *)dtPtr;
-		DTableDesc const dtd = HUF_getDTableDesc(DTable);
-		HUF_decodeStreamX4(ostart, &bitD, oend, dt, dtd.tableLog);
-	}
-
-	/* check */
-	if (!BIT_endOfDStream(&bitD))
-		return ERROR(corruption_detected);
-
-	/* decoded size */
-	return dstSize;
-}
-
-size_t HUF_decompress1X4_usingDTable(void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable)
-{
-	DTableDesc dtd = HUF_getDTableDesc(DTable);
-	if (dtd.tableType != 1)
-		return ERROR(GENERIC);
-	return HUF_decompress1X4_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable);
-}
-
-size_t HUF_decompress1X4_DCtx_wksp(HUF_DTable *DCtx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace, size_t workspaceSize)
-{
-	const BYTE *ip = (const BYTE *)cSrc;
-
-	size_t const hSize = HUF_readDTableX4_wksp(DCtx, cSrc, cSrcSize, workspace, workspaceSize);
-	if (HUF_isError(hSize))
-		return hSize;
-	if (hSize >= cSrcSize)
-		return ERROR(srcSize_wrong);
-	ip += hSize;
-	cSrcSize -= hSize;
-
-	return HUF_decompress1X4_usingDTable_internal(dst, dstSize, ip, cSrcSize, DCtx);
-}
-
-static size_t HUF_decompress4X4_usingDTable_internal(void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable)
-{
-	if (cSrcSize < 10)
-		return ERROR(corruption_detected); /* strict minimum : jump table + 1 byte per stream */
-
-	{
-		const BYTE *const istart = (const BYTE *)cSrc;
-		BYTE *const ostart = (BYTE *)dst;
-		BYTE *const oend = ostart + dstSize;
-		const void *const dtPtr = DTable + 1;
-		const HUF_DEltX4 *const dt = (const HUF_DEltX4 *)dtPtr;
-
-		/* Init */
-		BIT_DStream_t bitD1;
-		BIT_DStream_t bitD2;
-		BIT_DStream_t bitD3;
-		BIT_DStream_t bitD4;
-		size_t const length1 = ZSTD_readLE16(istart);
-		size_t const length2 = ZSTD_readLE16(istart + 2);
-		size_t const length3 = ZSTD_readLE16(istart + 4);
-		size_t const length4 = cSrcSize - (length1 + length2 + length3 + 6);
-		const BYTE *const istart1 = istart + 6; /* jumpTable */
-		const BYTE *const istart2 = istart1 + length1;
-		const BYTE *const istart3 = istart2 + length2;
-		const BYTE *const istart4 = istart3 + length3;
-		size_t const segmentSize = (dstSize + 3) / 4;
-		BYTE *const opStart2 = ostart + segmentSize;
-		BYTE *const opStart3 = opStart2 + segmentSize;
-		BYTE *const opStart4 = opStart3 + segmentSize;
-		BYTE *op1 = ostart;
-		BYTE *op2 = opStart2;
-		BYTE *op3 = opStart3;
-		BYTE *op4 = opStart4;
-		U32 endSignal;
-		DTableDesc const dtd = HUF_getDTableDesc(DTable);
-		U32 const dtLog = dtd.tableLog;
-
-		if (length4 > cSrcSize)
-			return ERROR(corruption_detected); /* overflow */
-		{
-			size_t const errorCode = BIT_initDStream(&bitD1, istart1, length1);
-			if (HUF_isError(errorCode))
-				return errorCode;
-		}
-		{
-			size_t const errorCode = BIT_initDStream(&bitD2, istart2, length2);
-			if (HUF_isError(errorCode))
-				return errorCode;
-		}
-		{
-			size_t const errorCode = BIT_initDStream(&bitD3, istart3, length3);
-			if (HUF_isError(errorCode))
-				return errorCode;
-		}
-		{
-			size_t const errorCode = BIT_initDStream(&bitD4, istart4, length4);
-			if (HUF_isError(errorCode))
-				return errorCode;
-		}
-
-		/* 16-32 symbols per loop (4-8 symbols per stream) */
-		endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4);
-		for (; (endSignal == BIT_DStream_unfinished) & (op4 < (oend - (sizeof(bitD4.bitContainer) - 1)));) {
-			HUF_DECODE_SYMBOLX4_2(op1, &bitD1);
-			HUF_DECODE_SYMBOLX4_2(op2, &bitD2);
-			HUF_DECODE_SYMBOLX4_2(op3, &bitD3);
-			HUF_DECODE_SYMBOLX4_2(op4, &bitD4);
-			HUF_DECODE_SYMBOLX4_1(op1, &bitD1);
-			HUF_DECODE_SYMBOLX4_1(op2, &bitD2);
-			HUF_DECODE_SYMBOLX4_1(op3, &bitD3);
-			HUF_DECODE_SYMBOLX4_1(op4, &bitD4);
-			HUF_DECODE_SYMBOLX4_2(op1, &bitD1);
-			HUF_DECODE_SYMBOLX4_2(op2, &bitD2);
-			HUF_DECODE_SYMBOLX4_2(op3, &bitD3);
-			HUF_DECODE_SYMBOLX4_2(op4, &bitD4);
-			HUF_DECODE_SYMBOLX4_0(op1, &bitD1);
-			HUF_DECODE_SYMBOLX4_0(op2, &bitD2);
-			HUF_DECODE_SYMBOLX4_0(op3, &bitD3);
-			HUF_DECODE_SYMBOLX4_0(op4, &bitD4);
-
-			endSignal = BIT_reloadDStream(&bitD1) | BIT_reloadDStream(&bitD2) | BIT_reloadDStream(&bitD3) | BIT_reloadDStream(&bitD4);
-		}
-
-		/* check corruption */
-		if (op1 > opStart2)
-			return ERROR(corruption_detected);
-		if (op2 > opStart3)
-			return ERROR(corruption_detected);
-		if (op3 > opStart4)
-			return ERROR(corruption_detected);
-		/* note : op4 already verified within main loop */
-
-		/* finish bitStreams one by one */
-		HUF_decodeStreamX4(op1, &bitD1, opStart2, dt, dtLog);
-		HUF_decodeStreamX4(op2, &bitD2, opStart3, dt, dtLog);
-		HUF_decodeStreamX4(op3, &bitD3, opStart4, dt, dtLog);
-		HUF_decodeStreamX4(op4, &bitD4, oend, dt, dtLog);
-
-		/* check */
-		{
-			U32 const endCheck = BIT_endOfDStream(&bitD1) & BIT_endOfDStream(&bitD2) & BIT_endOfDStream(&bitD3) & BIT_endOfDStream(&bitD4);
-			if (!endCheck)
-				return ERROR(corruption_detected);
-		}
-
-		/* decoded size */
-		return dstSize;
-	}
-}
-
-size_t HUF_decompress4X4_usingDTable(void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable)
-{
-	DTableDesc dtd = HUF_getDTableDesc(DTable);
-	if (dtd.tableType != 1)
-		return ERROR(GENERIC);
-	return HUF_decompress4X4_usingDTable_internal(dst, dstSize, cSrc, cSrcSize, DTable);
-}
-
-size_t HUF_decompress4X4_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace, size_t workspaceSize)
-{
-	const BYTE *ip = (const BYTE *)cSrc;
-
-	size_t hSize = HUF_readDTableX4_wksp(dctx, cSrc, cSrcSize, workspace, workspaceSize);
-	if (HUF_isError(hSize))
-		return hSize;
-	if (hSize >= cSrcSize)
-		return ERROR(srcSize_wrong);
-	ip += hSize;
-	cSrcSize -= hSize;
-
-	return HUF_decompress4X4_usingDTable_internal(dst, dstSize, ip, cSrcSize, dctx);
-}
-
-/* ********************************/
-/* Generic decompression selector */
-/* ********************************/
-
-size_t HUF_decompress1X_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable)
-{
-	DTableDesc const dtd = HUF_getDTableDesc(DTable);
-	return dtd.tableType ? HUF_decompress1X4_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable)
-			     : HUF_decompress1X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable);
-}
-
-size_t HUF_decompress4X_usingDTable(void *dst, size_t maxDstSize, const void *cSrc, size_t cSrcSize, const HUF_DTable *DTable)
-{
-	DTableDesc const dtd = HUF_getDTableDesc(DTable);
-	return dtd.tableType ? HUF_decompress4X4_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable)
-			     : HUF_decompress4X2_usingDTable_internal(dst, maxDstSize, cSrc, cSrcSize, DTable);
-}
-
-typedef struct {
-	U32 tableTime;
-	U32 decode256Time;
-} algo_time_t;
-static const algo_time_t algoTime[16 /* Quantization */][3 /* single, double, quad */] = {
-    /* single, double, quad */
-    {{0, 0}, {1, 1}, {2, 2}},		     /* Q==0 : impossible */
-    {{0, 0}, {1, 1}, {2, 2}},		     /* Q==1 : impossible */
-    {{38, 130}, {1313, 74}, {2151, 38}},     /* Q == 2 : 12-18% */
-    {{448, 128}, {1353, 74}, {2238, 41}},    /* Q == 3 : 18-25% */
-    {{556, 128}, {1353, 74}, {2238, 47}},    /* Q == 4 : 25-32% */
-    {{714, 128}, {1418, 74}, {2436, 53}},    /* Q == 5 : 32-38% */
-    {{883, 128}, {1437, 74}, {2464, 61}},    /* Q == 6 : 38-44% */
-    {{897, 128}, {1515, 75}, {2622, 68}},    /* Q == 7 : 44-50% */
-    {{926, 128}, {1613, 75}, {2730, 75}},    /* Q == 8 : 50-56% */
-    {{947, 128}, {1729, 77}, {3359, 77}},    /* Q == 9 : 56-62% */
-    {{1107, 128}, {2083, 81}, {4006, 84}},   /* Q ==10 : 62-69% */
-    {{1177, 128}, {2379, 87}, {4785, 88}},   /* Q ==11 : 69-75% */
-    {{1242, 128}, {2415, 93}, {5155, 84}},   /* Q ==12 : 75-81% */
-    {{1349, 128}, {2644, 106}, {5260, 106}}, /* Q ==13 : 81-87% */
-    {{1455, 128}, {2422, 124}, {4174, 124}}, /* Q ==14 : 87-93% */
-    {{722, 128}, {1891, 145}, {1936, 146}},  /* Q ==15 : 93-99% */
-};
-
-/** HUF_selectDecoder() :
-*   Tells which decoder is likely to decode faster,
-*   based on a set of pre-determined metrics.
-*   @return : 0==HUF_decompress4X2, 1==HUF_decompress4X4 .
-*   Assumption : 0 < cSrcSize < dstSize <= 128 KB */
-U32 HUF_selectDecoder(size_t dstSize, size_t cSrcSize)
-{
-	/* decoder timing evaluation */
-	U32 const Q = (U32)(cSrcSize * 16 / dstSize); /* Q < 16 since dstSize > cSrcSize */
-	U32 const D256 = (U32)(dstSize >> 8);
-	U32 const DTime0 = algoTime[Q][0].tableTime + (algoTime[Q][0].decode256Time * D256);
-	U32 DTime1 = algoTime[Q][1].tableTime + (algoTime[Q][1].decode256Time * D256);
-	DTime1 += DTime1 >> 3; /* advantage to algorithm using less memory, for cache eviction */
-
-	return DTime1 < DTime0;
-}
-
-typedef size_t (*decompressionAlgo)(void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize);
-
-size_t HUF_decompress4X_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace, size_t workspaceSize)
-{
-	/* validation checks */
-	if (dstSize == 0)
-		return ERROR(dstSize_tooSmall);
-	if (cSrcSize > dstSize)
-		return ERROR(corruption_detected); /* invalid */
-	if (cSrcSize == dstSize) {
-		memcpy(dst, cSrc, dstSize);
-		return dstSize;
-	} /* not compressed */
-	if (cSrcSize == 1) {
-		memset(dst, *(const BYTE *)cSrc, dstSize);
-		return dstSize;
-	} /* RLE */
-
-	{
-		U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize);
-		return algoNb ? HUF_decompress4X4_DCtx_wksp(dctx, dst, dstSize, cSrc, cSrcSize, workspace, workspaceSize)
-			      : HUF_decompress4X2_DCtx_wksp(dctx, dst, dstSize, cSrc, cSrcSize, workspace, workspaceSize);
-	}
-}
-
-size_t HUF_decompress4X_hufOnly_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace, size_t workspaceSize)
-{
-	/* validation checks */
-	if (dstSize == 0)
-		return ERROR(dstSize_tooSmall);
-	if ((cSrcSize >= dstSize) || (cSrcSize <= 1))
-		return ERROR(corruption_detected); /* invalid */
-
-	{
-		U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize);
-		return algoNb ? HUF_decompress4X4_DCtx_wksp(dctx, dst, dstSize, cSrc, cSrcSize, workspace, workspaceSize)
-			      : HUF_decompress4X2_DCtx_wksp(dctx, dst, dstSize, cSrc, cSrcSize, workspace, workspaceSize);
-	}
-}
-
-size_t HUF_decompress1X_DCtx_wksp(HUF_DTable *dctx, void *dst, size_t dstSize, const void *cSrc, size_t cSrcSize, void *workspace, size_t workspaceSize)
-{
-	/* validation checks */
-	if (dstSize == 0)
-		return ERROR(dstSize_tooSmall);
-	if (cSrcSize > dstSize)
-		return ERROR(corruption_detected); /* invalid */
-	if (cSrcSize == dstSize) {
-		memcpy(dst, cSrc, dstSize);
-		return dstSize;
-	} /* not compressed */
-	if (cSrcSize == 1) {
-		memset(dst, *(const BYTE *)cSrc, dstSize);
-		return dstSize;
-	} /* RLE */
-
-	{
-		U32 const algoNb = HUF_selectDecoder(dstSize, cSrcSize);
-		return algoNb ? HUF_decompress1X4_DCtx_wksp(dctx, dst, dstSize, cSrc, cSrcSize, workspace, workspaceSize)
-			      : HUF_decompress1X2_DCtx_wksp(dctx, dst, dstSize, cSrc, cSrcSize, workspace, workspaceSize);
-	}
-}
@@ -1,149 +0,0 @@
-/**
- * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of https://github.com/facebook/zstd.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- */
-
-#ifndef MEM_H_MODULE
-#define MEM_H_MODULE
-
-/*-****************************************
-*  Dependencies
-******************************************/
-#include <asm/unaligned.h>
-#include <linux/string.h> /* memcpy */
-#include <linux/types.h>  /* size_t, ptrdiff_t */
-
-/*-****************************************
-*  Compiler specifics
-******************************************/
-#define ZSTD_STATIC static __inline __attribute__((unused))
-
-/*-**************************************************************
-*  Basic Types
-*****************************************************************/
-typedef uint8_t BYTE;
-typedef uint16_t U16;
-typedef int16_t S16;
-typedef uint32_t U32;
-typedef int32_t S32;
-typedef uint64_t U64;
-typedef int64_t S64;
-typedef ptrdiff_t iPtrDiff;
-typedef uintptr_t uPtrDiff;
-
-/*-**************************************************************
-*  Memory I/O
-*****************************************************************/
-ZSTD_STATIC unsigned ZSTD_32bits(void) { return sizeof(size_t) == 4; }
-ZSTD_STATIC unsigned ZSTD_64bits(void) { return sizeof(size_t) == 8; }
-
-#if defined(__LITTLE_ENDIAN)
-#define ZSTD_LITTLE_ENDIAN 1
-#else
-#define ZSTD_LITTLE_ENDIAN 0
-#endif
-
-ZSTD_STATIC unsigned ZSTD_isLittleEndian(void) { return ZSTD_LITTLE_ENDIAN; }
-
-ZSTD_STATIC U16 ZSTD_read16(const void *memPtr) { return get_unaligned((const U16 *)memPtr); }
-
-ZSTD_STATIC U32 ZSTD_read32(const void *memPtr) { return get_unaligned((const U32 *)memPtr); }
-
-ZSTD_STATIC U64 ZSTD_read64(const void *memPtr) { return get_unaligned((const U64 *)memPtr); }
-
-ZSTD_STATIC size_t ZSTD_readST(const void *memPtr) { return get_unaligned((const size_t *)memPtr); }
-
-ZSTD_STATIC void ZSTD_write16(void *memPtr, U16 value) { put_unaligned(value, (U16 *)memPtr); }
-
-ZSTD_STATIC void ZSTD_write32(void *memPtr, U32 value) { put_unaligned(value, (U32 *)memPtr); }
-
-ZSTD_STATIC void ZSTD_write64(void *memPtr, U64 value) { put_unaligned(value, (U64 *)memPtr); }
-
-/*=== Little endian r/w ===*/
-
-ZSTD_STATIC U16 ZSTD_readLE16(const void *memPtr) { return get_unaligned_le16(memPtr); }
-
-ZSTD_STATIC void ZSTD_writeLE16(void *memPtr, U16 val) { put_unaligned_le16(val, memPtr); }
-
-ZSTD_STATIC U32 ZSTD_readLE24(const void *memPtr) { return ZSTD_readLE16(memPtr) + (((const BYTE *)memPtr)[2] << 16); }
-
-ZSTD_STATIC void ZSTD_writeLE24(void *memPtr, U32 val)
-{
-	ZSTD_writeLE16(memPtr, (U16)val);
-	((BYTE *)memPtr)[2] = (BYTE)(val >> 16);
-}
-
-ZSTD_STATIC U32 ZSTD_readLE32(const void *memPtr) { return get_unaligned_le32(memPtr); }
-
-ZSTD_STATIC void ZSTD_writeLE32(void *memPtr, U32 val32) { put_unaligned_le32(val32, memPtr); }
-
-ZSTD_STATIC U64 ZSTD_readLE64(const void *memPtr) { return get_unaligned_le64(memPtr); }
-
-ZSTD_STATIC void ZSTD_writeLE64(void *memPtr, U64 val64) { put_unaligned_le64(val64, memPtr); }
-
-ZSTD_STATIC size_t ZSTD_readLEST(const void *memPtr)
-{
-	if (ZSTD_32bits())
-		return (size_t)ZSTD_readLE32(memPtr);
-	else
-		return (size_t)ZSTD_readLE64(memPtr);
-}
-
-ZSTD_STATIC void ZSTD_writeLEST(void *memPtr, size_t val)
-{
-	if (ZSTD_32bits())
-		ZSTD_writeLE32(memPtr, (U32)val);
-	else
-		ZSTD_writeLE64(memPtr, (U64)val);
-}
-
-/*=== Big endian r/w ===*/
-
-ZSTD_STATIC U32 ZSTD_readBE32(const void *memPtr) { return get_unaligned_be32(memPtr); }
-
-ZSTD_STATIC void ZSTD_writeBE32(void *memPtr, U32 val32) { put_unaligned_be32(val32, memPtr); }
-
-ZSTD_STATIC U64 ZSTD_readBE64(const void *memPtr) { return get_unaligned_be64(memPtr); }
-
-ZSTD_STATIC void ZSTD_writeBE64(void *memPtr, U64 val64) { put_unaligned_be64(val64, memPtr); }
-
-ZSTD_STATIC size_t ZSTD_readBEST(const void *memPtr)
-{
-	if (ZSTD_32bits())
-		return (size_t)ZSTD_readBE32(memPtr);
-	else
-		return (size_t)ZSTD_readBE64(memPtr);
-}
-
-ZSTD_STATIC void ZSTD_writeBEST(void *memPtr, size_t val)
-{
-	if (ZSTD_32bits())
-		ZSTD_writeBE32(memPtr, (U32)val);
-	else
-		ZSTD_writeBE64(memPtr, (U64)val);
-}
-
-/* function safe only for comparisons */
-ZSTD_STATIC U32 ZSTD_readMINMATCH(const void *memPtr, U32 length)
-{
-	switch (length) {
-	default:
-	case 4: return ZSTD_read32(memPtr);
-	case 3:
-		if (ZSTD_isLittleEndian())
-			return ZSTD_read32(memPtr) << 8;
-		else
-			return ZSTD_read32(memPtr) >> 8;
-	}
-}
-
-#endif /* MEM_H_MODULE */
@@ -1,73 +0,0 @@
-/**
- * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of https://github.com/facebook/zstd.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- */
-
-/*-*************************************
-*  Dependencies
-***************************************/
-#include "error_private.h"
-#include "zstd_internal.h" /* declaration of ZSTD_isError, ZSTD_getErrorName, ZSTD_getErrorCode, ZSTD_getErrorString, ZSTD_versionNumber */
-#include <linux/kernel.h>
-
-/*=**************************************************************
-*  Custom allocator
-****************************************************************/
-
-#define stack_push(stack, size)                                 \
-	({                                                      \
-		void *const ptr = ZSTD_PTR_ALIGN((stack)->ptr); \
-		(stack)->ptr = (char *)ptr + (size);            \
-		(stack)->ptr <= (stack)->end ? ptr : NULL;      \
-	})
-
-ZSTD_customMem ZSTD_initStack(void *workspace, size_t workspaceSize)
-{
-	ZSTD_customMem stackMem = {ZSTD_stackAlloc, ZSTD_stackFree, workspace};
-	ZSTD_stack *stack = (ZSTD_stack *)workspace;
-	/* Verify preconditions */
-	if (!workspace || workspaceSize < sizeof(ZSTD_stack) || workspace != ZSTD_PTR_ALIGN(workspace)) {
-		ZSTD_customMem error = {NULL, NULL, NULL};
-		return error;
-	}
-	/* Initialize the stack */
-	stack->ptr = workspace;
-	stack->end = (char *)workspace + workspaceSize;
-	stack_push(stack, sizeof(ZSTD_stack));
-	return stackMem;
-}
-
-void *ZSTD_stackAllocAll(void *opaque, size_t *size)
-{
-	ZSTD_stack *stack = (ZSTD_stack *)opaque;
-	*size = (BYTE const *)stack->end - (BYTE *)ZSTD_PTR_ALIGN(stack->ptr);
-	return stack_push(stack, *size);
-}
-
-void *ZSTD_stackAlloc(void *opaque, size_t size)
-{
-	ZSTD_stack *stack = (ZSTD_stack *)opaque;
-	return stack_push(stack, size);
-}
-void ZSTD_stackFree(void *opaque, void *address)
-{
-	(void)opaque;
-	(void)address;
-}
-
-void *ZSTD_malloc(size_t size, ZSTD_customMem customMem) { return customMem.customAlloc(customMem.opaque, size); }
-
-void ZSTD_free(void *ptr, ZSTD_customMem customMem)
-{
-	if (ptr != NULL)
-		customMem.customFree(customMem.opaque, ptr);
-}
@@ -1,261 +0,0 @@
-/**
- * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under the BSD-style license found in the
- * LICENSE file in the root directory of https://github.com/facebook/zstd.
- *
- * This program is free software; you can redistribute it and/or modify it under
- * the terms of the GNU General Public License version 2 as published by the
- * Free Software Foundation. This program is dual-licensed; you may select
- * either version 2 of the GNU General Public License ("GPL") or BSD license
- * ("BSD").
- */
-
-#ifndef ZSTD_CCOMMON_H_MODULE
-#define ZSTD_CCOMMON_H_MODULE
-
-/*-*******************************************************
-*  Compiler specifics
-*********************************************************/
-#define FORCE_INLINE static __always_inline
-#define FORCE_NOINLINE static noinline
-
-/*-*************************************
-*  Dependencies
-***************************************/
-#include "error_private.h"
-#include "mem.h"
-#include <linux/compiler.h>
-#include <linux/kernel.h>
-#include <linux/xxhash.h>
-#include <linux/zstd.h>
-
-/*-*************************************
-*  shared macros
-***************************************/
-#define MIN(a, b) ((a) < (b) ? (a) : (b))
-#define MAX(a, b) ((a) > (b) ? (a) : (b))
-#define CHECK_F(f)                       \
-	{                                \
-		size_t const errcod = f; \
-		if (ERR_isError(errcod)) \
-			return errcod;   \
-	} /* check and Forward error code */
-#define CHECK_E(f, e)                    \
-	{                                \
-		size_t const errcod = f; \
-		if (ERR_isError(errcod)) \
-			return ERROR(e); \
-	} /* check and send Error code */
-#define ZSTD_STATIC_ASSERT(c)                                   \
-	{                                                       \
-		enum { ZSTD_static_assert = 1 / (int)(!!(c)) }; \
-	}
-
-/*-*************************************
-*  Common constants
-***************************************/
-#define ZSTD_OPT_NUM (1 << 12)
-#define ZSTD_DICT_MAGIC 0xEC30A437 /* v0.7+ */
-
-#define ZSTD_REP_NUM 3		      /* number of repcodes */
-#define ZSTD_REP_CHECK (ZSTD_REP_NUM) /* number of repcodes to check by the optimal parser */
-#define ZSTD_REP_MOVE (ZSTD_REP_NUM - 1)
-#define ZSTD_REP_MOVE_OPT (ZSTD_REP_NUM)
-static const U32 repStartValue[ZSTD_REP_NUM] = {1, 4, 8};
-
-#define KB *(1 << 10)
-#define MB *(1 << 20)
-#define GB *(1U << 30)
-
-#define BIT7 128
-#define BIT6 64
-#define BIT5 32
-#define BIT4 16
-#define BIT1 2
-#define BIT0 1
-
-#define ZSTD_WINDOWLOG_ABSOLUTEMIN 10
-static const size_t ZSTD_fcs_fieldSize[4] = {0, 2, 4, 8};
-static const size_t ZSTD_did_fieldSize[4] = {0, 1, 2, 4};
-
-#define ZSTD_BLOCKHEADERSIZE 3 /* C standard doesn't allow `static const` variable to be init using another `static const` variable */
-static const size_t ZSTD_blockHeaderSize = ZSTD_BLOCKHEADERSIZE;
-typedef enum { bt_raw, bt_rle, bt_compressed, bt_reserved } blockType_e;
-
-#define MIN_SEQUENCES_SIZE 1									  /* nbSeq==0 */
-#define MIN_CBLOCK_SIZE (1 /*litCSize*/ + 1 /* RLE or RAW */ + MIN_SEQUENCES_SIZE /* nbSeq==0 */) /* for a non-null block */
-
-#define HufLog 12
-typedef enum { set_basic, set_rle, set_compressed, set_repeat } symbolEncodingType_e;
-
-#define LONGNBSEQ 0x7F00
-
-#define MINMATCH 3
-#define EQUAL_READ32 4
-
-#define Litbits 8
-#define MaxLit ((1 << Litbits) - 1)
-#define MaxML 52
-#define MaxLL 35
-#define MaxOff 28
-#define MaxSeq MAX(MaxLL, MaxML) /* Assumption : MaxOff < MaxLL,MaxML */
-#define MLFSELog 9
-#define LLFSELog 9
-#define OffFSELog 8
-
-static const U32 LL_bits[MaxLL + 1] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};
-static const S16 LL_defaultNorm[MaxLL + 1] = {4, 3, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 3, 2, 1, 1, 1, 1, 1, -1, -1, -1, -1};
-#define LL_DEFAULTNORMLOG 6 /* for static allocation */
-static const U32 LL_defaultNormLog = LL_DEFAULTNORMLOG;
-
-static const U32 ML_bits[MaxML + 1] = {0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,  0,  0,  0,  0,  0,  0, 0,
-				       0, 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 3, 3, 4, 4, 5, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16};
-static const S16 ML_defaultNorm[MaxML + 1] = {1, 4, 3, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,  1,  1,  1,  1,  1,  1, 1,
-					      1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1, -1, -1};
-#define ML_DEFAULTNORMLOG 6 /* for static allocation */
-static const U32 ML_defaultNormLog = ML_DEFAULTNORMLOG;
-
-static const S16 OF_defaultNorm[MaxOff + 1] = {1, 1, 1, 1, 1, 1, 2, 2, 2, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, -1, -1, -1, -1, -1};
-#define OF_DEFAULTNORMLOG 5 /* for static allocation */
-static const U32 OF_defaultNormLog = OF_DEFAULTNORMLOG;
-
-/*-*******************************************
-*  Shared functions to include for inlining
-*********************************************/
-ZSTD_STATIC void ZSTD_copy8(void *dst, const void *src) {
-	memcpy(dst, src, 8);
-}
-/*! ZSTD_wildcopy() :
-*   custom version of memcpy(), can copy up to 7 bytes too many (8 bytes if length==0) */
-#define WILDCOPY_OVERLENGTH 8
-ZSTD_STATIC void ZSTD_wildcopy(void *dst, const void *src, ptrdiff_t length)
-{
-	const BYTE* ip = (const BYTE*)src;
-	BYTE* op = (BYTE*)dst;
-	BYTE* const oend = op + length;
-	/* Work around https://gcc.gnu.org/bugzilla/show_bug.cgi?id=81388.
-	 * Avoid the bad case where the loop only runs once by handling the
-	 * special case separately. This doesn't trigger the bug because it
-	 * doesn't involve pointer/integer overflow.
-	 */
-	if (length <= 8)
-		return ZSTD_copy8(dst, src);
-	do {
-		ZSTD_copy8(op, ip);
-		op += 8;
-		ip += 8;
-	} while (op < oend);
-}
-
-/*-*******************************************
-*  Private interfaces
-*********************************************/
-typedef struct ZSTD_stats_s ZSTD_stats_t;
-
-typedef struct {
-	U32 off;
-	U32 len;
-} ZSTD_match_t;
-
-typedef struct {
-	U32 price;
-	U32 off;
-	U32 mlen;
-	U32 litlen;
-	U32 rep[ZSTD_REP_NUM];
-} ZSTD_optimal_t;
-
-typedef struct seqDef_s {
-	U32 offset;
-	U16 litLength;
-	U16 matchLength;
-} seqDef;
-
-typedef struct {
-	seqDef *sequencesStart;
-	seqDef *sequences;
-	BYTE *litStart;
-	BYTE *lit;
-	BYTE *llCode;
-	BYTE *mlCode;
-	BYTE *ofCode;
-	U32 longLengthID; /* 0 == no longLength; 1 == Lit.longLength; 2 == Match.longLength; */
-	U32 longLengthPos;
-	/* opt */
-	ZSTD_optimal_t *priceTable;
-	ZSTD_match_t *matchTable;
-	U32 *matchLengthFreq;
-	U32 *litLengthFreq;
-	U32 *litFreq;
-	U32 *offCodeFreq;
-	U32 matchLengthSum;
-	U32 matchSum;
-	U32 litLengthSum;
-	U32 litSum;
-	U32 offCodeSum;
-	U32 log2matchLengthSum;
-	U32 log2matchSum;
-	U32 log2litLengthSum;
-	U32 log2litSum;
-	U32 log2offCodeSum;
-	U32 factor;
-	U32 staticPrices;
-	U32 cachedPrice;
-	U32 cachedLitLength;
-	const BYTE *cachedLiterals;
-} seqStore_t;
-
-const seqStore_t *ZSTD_getSeqStore(const ZSTD_CCtx *ctx);
-void ZSTD_seqToCodes(const seqStore_t *seqStorePtr);
-int ZSTD_isSkipFrame(ZSTD_DCtx *dctx);
-
-/*= Custom memory allocation functions */
-typedef void *(*ZSTD_allocFunction)(void *opaque, size_t size);
-typedef void (*ZSTD_freeFunction)(void *opaque, void *address);
-typedef struct {
-	ZSTD_allocFunction customAlloc;
-	ZSTD_freeFunction customFree;
-	void *opaque;
-} ZSTD_customMem;
-
-void *ZSTD_malloc(size_t size, ZSTD_customMem customMem);
-void ZSTD_free(void *ptr, ZSTD_customMem customMem);
-
-/*====== stack allocation  ======*/
-
-typedef struct {
-	void *ptr;
-	const void *end;
-} ZSTD_stack;
-
-#define ZSTD_ALIGN(x) ALIGN(x, sizeof(size_t))
-#define ZSTD_PTR_ALIGN(p) PTR_ALIGN(p, sizeof(size_t))
-
-ZSTD_customMem ZSTD_initStack(void *workspace, size_t workspaceSize);
-
-void *ZSTD_stackAllocAll(void *opaque, size_t *size);
-void *ZSTD_stackAlloc(void *opaque, size_t size);
-void ZSTD_stackFree(void *opaque, void *address);
-
-/*======  common function  ======*/
-
-ZSTD_STATIC U32 ZSTD_highbit32(U32 val) { return 31 - __builtin_clz(val); }
-
-/* hidden functions */
-
-/* ZSTD_invalidateRepCodes() :
- * ensures next compression will not use repcodes from previous block.
- * Note : only works with regular variant;
- *        do not use with extDict variant ! */
-void ZSTD_invalidateRepCodes(ZSTD_CCtx *cctx);
-
-size_t ZSTD_freeCCtx(ZSTD_CCtx *cctx);
-size_t ZSTD_freeDCtx(ZSTD_DCtx *dctx);
-size_t ZSTD_freeCDict(ZSTD_CDict *cdict);
-size_t ZSTD_freeDDict(ZSTD_DDict *cdict);
-size_t ZSTD_freeCStream(ZSTD_CStream *zcs);
-size_t ZSTD_freeDStream(ZSTD_DStream *zds);
-
-#endif /* ZSTD_CCOMMON_H_MODULE */
@@ -0,0 +1,37 @@
+# SPDX-License-Identifier: GPL-2.0-only
+obj-$(CONFIG_ZSTD_COMPRESS) += zstd_compress.o
+obj-$(CONFIG_ZSTD_DECOMPRESS) += zstd_decompress.o
+
+ccflags-y += -O3
+
+zstd_compress-y := \
+		zstd_compress_module.o \
+		common/debug.o \
+		common/entropy_common.o \
+		common/error_private.o \
+		common/fse_decompress.o \
+		common/zstd_common.o \
+		compress/fse_compress.o \
+		compress/hist.o \
+		compress/huf_compress.o \
+		compress/zstd_compress.o \
+		compress/zstd_compress_literals.o \
+		compress/zstd_compress_sequences.o \
+		compress/zstd_compress_superblock.o \
+		compress/zstd_double_fast.o \
+		compress/zstd_fast.o \
+		compress/zstd_lazy.o \
+		compress/zstd_ldm.o \
+		compress/zstd_opt.o \
+
+zstd_decompress-y := \
+		zstd_decompress_module.o \
+		common/debug.o \
+		common/entropy_common.o \
+		common/error_private.o \
+		common/fse_decompress.o \
+		common/zstd_common.o \
+		decompress/huf_decompress.o \
+		decompress/zstd_ddict.o \
+		decompress/zstd_decompress.o \
+		decompress/zstd_decompress_block.o \
@@ -0,0 +1,459 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of https://github.com/facebook/zstd.
+ * An additional grant of patent rights can be found in the PATENTS file in the
+ * same directory.
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation. This program is dual-licensed; you may select
+ * either version 2 of the GNU General Public License ("GPL") or BSD license
+ * ("BSD").
+ */
+
+#ifndef LINUX_ZSTD_H
+#define LINUX_ZSTD_H
+
+/**
+ * This is a kernel-style API that wraps the upstream zstd API, which cannot be
+ * used directly because the symbols aren't exported. It exposes the minimal
+ * functionality which is currently required by users of zstd in the kernel.
+ * Expose extra functions from lib/zstd/zstd.h as needed.
+ */
+
+/* ======   Dependency   ====== */
+#include <linux/types.h>
+
+/* ======   Helper Functions   ====== */
+/**
+ * zstd_compress_bound() - maximum compressed size in worst case scenario
+ * @src_size: The size of the data to compress.
+ *
+ * Return:    The maximum compressed size in the worst case scenario.
+ */
+size_t zstd_compress_bound(size_t src_size);
+
+/**
+ * zstd_is_error() - tells if a size_t function result is an error code
+ * @code:  The function result to check for error.
+ *
+ * Return: Non-zero iff the code is an error.
+ */
+unsigned int zstd_is_error(size_t code);
+
+/**
+ * zstd_get_error_code() - translates an error function result to an error code
+ * @code:  The function result for which zstd_is_error(code) is true.
+ *
+ * Return: A unique error code for this error.
+ */
+int zstd_get_error_code(size_t code);
+
+/**
+ * zstd_get_error_name() - translates an error function result to a string
+ * @code:  The function result for which zstd_is_error(code) is true.
+ *
+ * Return: An error string corresponding to the error code.
+ */
+const char *zstd_get_error_name(size_t code);
+
+/* ======   Parameter Selection   ====== */
+
+/**
+ * enum zstd_strategy - zstd compression search strategy
+ *
+ * From faster to stronger.
+ */
+enum zstd_strategy {
+	zstd_fast = 1,
+	zstd_dfast = 2,
+	zstd_greedy = 3,
+	zstd_lazy = 4,
+	zstd_lazy2 = 5,
+	zstd_btlazy2 = 6,
+	zstd_btopt = 7,
+	zstd_btultra = 8,
+	zstd_btultra2 = 9
+};
+
+/**
+ * struct zstd_compression_parameters - zstd compression parameters
+ * @window_log:    Log of the largest match distance. Larger means more
+ *                 compression, and more memory needed during decompression.
+ * @chain_log:     Fully searched segment. Larger means more compression,
+ *                 slower, and more memory (useless for fast).
+ * @hash_log:      Dispatch table. Larger means more compression,
+ *                 slower, and more memory.
+ * @search_log:    Number of searches. Larger means more compression and slower.
+ * @search_length: Match length searched. Larger means faster decompression,
+ *                 sometimes less compression.
+ * @target_length: Acceptable match size for optimal parser (only). Larger means
+ *                 more compression, and slower.
+ * @strategy:      The zstd compression strategy.
+ */
+struct zstd_compression_parameters {
+	unsigned int window_log;
+	unsigned int chain_log;
+	unsigned int hash_log;
+	unsigned int search_log;
+	unsigned int search_length;
+	unsigned int target_length;
+	enum zstd_strategy strategy;
+};
+
+/**
+ * struct zstd_frame_parameters - zstd frame parameters
+ * @content_size_flag: Controls whether content size will be present in the
+ *                     frame header (when known).
+ * @checksum_flag:     Controls whether a 32-bit checksum is generated at the
+ *                     end of the frame for error detection.
+ * @no_dict_id_flag:   Controls whether dictID will be saved into the frame
+ *                     header when using dictionary compression.
+ *
+ * The default value is all fields set to 0.
+ */
+struct zstd_frame_parameters {
+	unsigned int content_size_flag;
+	unsigned int checksum_flag;
+	unsigned int no_dict_id_flag;
+};
+
+/**
+ * struct zstd_parameters - zstd parameters
+ * @cparams: The compression parameters.
+ * @fparams: The frame parameters.
+ */
+struct zstd_parameters {
+	struct zstd_compression_parameters cparams;
+	struct zstd_frame_parameters fparams;
+};
+
+/**
+ * zstd_get_params() - returns zstd_parameters for selected level
+ * @level:              The compression level
+ * @estimated_src_size: The estimated source size to compress or 0
+ *                      if unknown.
+ *
+ * Return:              The selected zstd_parameters.
+ */
+struct zstd_parameters zstd_get_params(int level,
+	unsigned long long estimated_src_size);
+
+/* ======   Single-pass Compression   ====== */
+
+typedef struct ZSTD_CCtx_s zstd_cctx;
+
+/**
+ * zstd_cctx_workspace_bound() - max memory needed to initialize a zstd_cctx
+ * @parameters: The compression parameters to be used.
+ *
+ * If multiple compression parameters might be used, the caller must call
+ * zstd_cctx_workspace_bound() for each set of parameters and use the maximum
+ * size.
+ *
+ * Return:      A lower bound on the size of the workspace that is passed to
+ *              zstd_init_cctx().
+ */
+size_t zstd_cctx_workspace_bound(
+	const struct zstd_compression_parameters *parameters);
+
+/**
+ * zstd_init_cctx() - initialize a zstd compression context
+ * @workspace:      The workspace to emplace the context into. It must outlive
+ *                  the returned context.
+ * @workspace_size: The size of workspace. Use zstd_cctx_workspace_bound() to
+ *                  determine how large the workspace must be.
+ *
+ * Return:          A zstd compression context or NULL on error.
+ */
+zstd_cctx *zstd_init_cctx(void *workspace, size_t workspace_size);
+
+/**
+ * zstd_compress_cctx() - compress src into dst with the initialized parameters
+ * @cctx:         The context. Must have been initialized with zstd_init_cctx().
+ * @dst:          The buffer to compress src into.
+ * @dst_capacity: The size of the destination buffer. May be any size, but
+ *                ZSTD_compressBound(srcSize) is guaranteed to be large enough.
+ * @src:          The data to compress.
+ * @src_size:     The size of the data to compress.
+ * @parameters:   The compression parameters to be used.
+ *
+ * Return:        The compressed size or an error, which can be checked using
+ *                zstd_is_error().
+ */
+size_t zstd_compress_cctx(zstd_cctx *cctx, void *dst, size_t dst_capacity,
+	const void *src, size_t src_size, const struct zstd_parameters *parameters);
+
+/* ======   Single-pass Decompression   ====== */
+
+typedef struct ZSTD_DCtx_s zstd_dctx;
+
+/**
+ * zstd_dctx_workspace_bound() - max memory needed to initialize a zstd_dctx
+ *
+ * Return: A lower bound on the size of the workspace that is passed to
+ *         zstd_init_dctx().
+ */
+size_t zstd_dctx_workspace_bound(void);
+
+/**
+ * zstd_init_dctx() - initialize a zstd decompression context
+ * @workspace:      The workspace to emplace the context into. It must outlive
+ *                  the returned context.
+ * @workspace_size: The size of workspace. Use zstd_dctx_workspace_bound() to
+ *                  determine how large the workspace must be.
+ *
+ * Return:          A zstd decompression context or NULL on error.
+ */
+zstd_dctx *zstd_init_dctx(void *workspace, size_t workspace_size);
+
+/**
+ * zstd_decompress_dctx() - decompress zstd compressed src into dst
+ * @dctx:         The decompression context.
+ * @dst:          The buffer to decompress src into.
+ * @dst_capacity: The size of the destination buffer. Must be at least as large
+ *                as the decompressed size. If the caller cannot upper bound the
+ *                decompressed size, then it's better to use the streaming API.
+ * @src:          The zstd compressed data to decompress. Multiple concatenated
+ *                frames and skippable frames are allowed.
+ * @src_size:     The exact size of the data to decompress.
+ *
+ * Return:        The decompressed size or an error, which can be checked using
+ *                zstd_is_error().
+ */
+size_t zstd_decompress_dctx(zstd_dctx *dctx, void *dst, size_t dst_capacity,
+	const void *src, size_t src_size);
+
+/* ======   Streaming Buffers   ====== */
+
+/**
+ * struct zstd_in_buffer - input buffer for streaming
+ * @src:  Start of the input buffer.
+ * @size: Size of the input buffer.
+ * @pos:  Position where reading stopped. Will be updated.
+ *        Necessarily 0 <= pos <= size.
+ */
+struct zstd_in_buffer {
+	const void *src;
+	size_t size;
+	size_t pos;
+};
+
+/**
+ * struct zstd_out_buffer - output buffer for streaming
+ * @dst:  Start of the output buffer.
+ * @size: Size of the output buffer.
+ * @pos:  Position where writing stopped. Will be updated.
+ *        Necessarily 0 <= pos <= size.
+ */
+struct zstd_out_buffer {
+	void *dst;
+	size_t size;
+	size_t pos;
+};
+
+/* ======   Streaming Compression   ====== */
+
+typedef struct ZSTD_CCtx_s zstd_cstream;
+
+/**
+ * zstd_cstream_workspace_bound() - memory needed to initialize a zstd_cstream
+ * @cparams: The compression parameters to be used for compression.
+ *
+ * Return:   A lower bound on the size of the workspace that is passed to
+ *           zstd_init_cstream().
+ */
+size_t zstd_cstream_workspace_bound(
+	const struct zstd_compression_parameters *cparams);
+
+/**
+ * zstd_init_cstream() - initialize a zstd streaming compression context
+ * @parameters        The zstd parameters to use for compression.
+ * @pledged_src_size: If params.fParams.contentSizeFlag == 1 then the caller
+ *                    must pass the source size (zero means empty source).
+ *                    Otherwise, the caller may optionally pass the source
+ *                    size, or zero if unknown.
+ * @workspace:        The workspace to emplace the context into. It must outlive
+ *                    the returned context.
+ * @workspace_size:   The size of workspace.
+ *                    Use zstd_cstream_workspace_bound(params->cparams) to
+ *                    determine how large the workspace must be.
+ *
+ * Return:            The zstd streaming compression context or NULL on error.
+ */
+zstd_cstream *zstd_init_cstream(const struct zstd_parameters *parameters,
+	unsigned long long pledged_src_size, void *workspace, size_t workspace_size);
+
+/**
+ * zstd_reset_cstream() - reset the context using parameters from creation
+ * @cstream:          The zstd streaming compression context to reset.
+ * @pledged_src_size: Optionally the source size, or zero if unknown.
+ *
+ * Resets the context using the parameters from creation. Skips dictionary
+ * loading, since it can be reused. If `pledged_src_size` is non-zero the frame
+ * content size is always written into the frame header.
+ *
+ * Return:            Zero or an error, which can be checked using
+ *                    zstd_is_error().
+ */
+size_t zstd_reset_cstream(zstd_cstream *cstream,
+	unsigned long long pledged_src_size);
+
+/**
+ * zstd_compress_stream() - streaming compress some of input into output
+ * @cstream: The zstd streaming compression context.
+ * @output:  Destination buffer. `output->pos` is updated to indicate how much
+ *           compressed data was written.
+ * @input:   Source buffer. `input->pos` is updated to indicate how much data
+ *           was read. Note that it may not consume the entire input, in which
+ *           case `input->pos < input->size`, and it's up to the caller to
+ *           present remaining data again.
+ *
+ * The `input` and `output` buffers may be any size. Guaranteed to make some
+ * forward progress if `input` and `output` are not empty.
+ *
+ * Return:   A hint for the number of bytes to use as the input for the next
+ *           function call or an error, which can be checked using
+ *           zstd_is_error().
+ */
+size_t zstd_compress_stream(zstd_cstream *cstream,
+	struct zstd_out_buffer *output, struct zstd_in_buffer *input);
+
+/**
+ * zstd_flush_stream() - flush internal buffers into output
+ * @cstream: The zstd streaming compression context.
+ * @output:  Destination buffer. `output->pos` is updated to indicate how much
+ *           compressed data was written.
+ *
+ * zstd_flush_stream() must be called until it returns 0, meaning all the data
+ * has been flushed. Since zstd_flush_stream() causes a block to be ended,
+ * calling it too often will degrade the compression ratio.
+ *
+ * Return:   The number of bytes still present within internal buffers or an
+ *           error, which can be checked using zstd_is_error().
+ */
+size_t zstd_flush_stream(zstd_cstream *cstream, struct zstd_out_buffer *output);
+
+/**
+ * zstd_end_stream() - flush internal buffers into output and end the frame
+ * @cstream: The zstd streaming compression context.
+ * @output:  Destination buffer. `output->pos` is updated to indicate how much
+ *           compressed data was written.
+ *
+ * zstd_end_stream() must be called until it returns 0, meaning all the data has
+ * been flushed and the frame epilogue has been written.
+ *
+ * Return:   The number of bytes still present within internal buffers or an
+ *           error, which can be checked using zstd_is_error().
+ */
+size_t zstd_end_stream(zstd_cstream *cstream, struct zstd_out_buffer *output);
+
+/* ======   Streaming Decompression   ====== */
+
+typedef struct ZSTD_DCtx_s zstd_dstream;
+
+/**
+ * zstd_dstream_workspace_bound() - memory needed to initialize a zstd_dstream
+ * @max_window_size: The maximum window size allowed for compressed frames.
+ *
+ * Return:           A lower bound on the size of the workspace that is passed
+ *                   to zstd_init_dstream().
+ */
+size_t zstd_dstream_workspace_bound(size_t max_window_size);
+
+/**
+ * zstd_init_dstream() - initialize a zstd streaming decompression context
+ * @max_window_size: The maximum window size allowed for compressed frames.
+ * @workspace:       The workspace to emplace the context into. It must outlive
+ *                   the returned context.
+ * @workspaceSize:   The size of workspace.
+ *                   Use zstd_dstream_workspace_bound(max_window_size) to
+ *                   determine how large the workspace must be.
+ *
+ * Return:           The zstd streaming decompression context.
+ */
+zstd_dstream *zstd_init_dstream(size_t max_window_size, void *workspace,
+	size_t workspace_size);
+
+/**
+ * zstd_reset_dstream() - reset the context using parameters from creation
+ * @dstream: The zstd streaming decompression context to reset.
+ *
+ * Resets the context using the parameters from creation. Skips dictionary
+ * loading, since it can be reused.
+ *
+ * Return:   Zero or an error, which can be checked using zstd_is_error().
+ */
+size_t zstd_reset_dstream(zstd_dstream *dstream);
+
+/**
+ * zstd_decompress_stream() - streaming decompress some of input into output
+ * @dstream: The zstd streaming decompression context.
+ * @output:  Destination buffer. `output.pos` is updated to indicate how much
+ *           decompressed data was written.
+ * @input:   Source buffer. `input.pos` is updated to indicate how much data was
+ *           read. Note that it may not consume the entire input, in which case
+ *           `input.pos < input.size`, and it's up to the caller to present
+ *           remaining data again.
+ *
+ * The `input` and `output` buffers may be any size. Guaranteed to make some
+ * forward progress if `input` and `output` are not empty.
+ * zstd_decompress_stream() will not consume the last byte of the frame until
+ * the entire frame is flushed.
+ *
+ * Return:   Returns 0 iff a frame is completely decoded and fully flushed.
+ *           Otherwise returns a hint for the number of bytes to use as the
+ *           input for the next function call or an error, which can be checked
+ *           using zstd_is_error(). The size hint will never load more than the
+ *           frame.
+ */
+size_t zstd_decompress_stream(zstd_dstream *dstream,
+	struct zstd_out_buffer *output, struct zstd_in_buffer *input);
+
+/* ======   Frame Inspection Functions ====== */
+
+/**
+ * zstd_find_frame_compressed_size() - returns the size of a compressed frame
+ * @src:      Source buffer. It should point to the start of a zstd encoded
+ *            frame or a skippable frame.
+ * @src_size: The size of the source buffer. It must be at least as large as the
+ *            size of the frame.
+ *
+ * Return:    The compressed size of the frame pointed to by `src` or an error,
+ *            which can be check with zstd_is_error().
+ *            Suitable to pass to ZSTD_decompress() or similar functions.
+ */
+size_t zstd_find_frame_compressed_size(const void *src, size_t src_size);
+
+/**
+ * struct zstd_frame_params - zstd frame parameters stored in the frame header
+ * @frame_content_size: The frame content size, or 0 if not present.
+ * @window_size:        The window size, or 0 if the frame is a skippable frame.
+ * @dict_id:            The dictionary id, or 0 if not present.
+ * @checksum_flag:      Whether a checksum was used.
+ */
+struct zstd_frame_params {
+	unsigned long long frame_content_size;
+	unsigned int window_size;
+	unsigned int dict_id;
+	unsigned int checksum_flag;
+};
+
+/**
+ * zstd_get_frame_params() - extracts parameters from a zstd or skippable frame
+ * @params:   On success the frame parameters are written here.
+ * @src:      The source buffer. It must point to a zstd or skippable frame.
+ * @src_size: The size of the source buffer.
+ *
+ * Return:    0 on success. If more data is required it returns how many bytes
+ *            must be provided to make forward progress. Otherwise it returns
+ *            an error, which can be checked using zstd_is_error().
+ */
+size_t zstd_get_frame_params(struct zstd_frame_params *params, const void *src,
+	size_t src_size);
+
+#endif  /* LINUX_ZSTD_H */
@@ -0,0 +1,258 @@
+/*
+ * Copyright (c) 2016-2020, Yann Collet, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+
+#ifndef MEM_H_MODULE
+#define MEM_H_MODULE
+
+/*-****************************************
+*  Dependencies
+******************************************/
+#include <asm/unaligned.h>  /* get_unaligned, put_unaligned* */
+#include <linux/compiler.h>  /* inline */
+#include <linux/swab.h>  /* swab32, swab64 */
+#include <linux/types.h>  /* size_t, ptrdiff_t */
+#include "debug.h"  /* DEBUG_STATIC_ASSERT */
+
+/*-****************************************
+*  Compiler specifics
+******************************************/
+#define MEM_STATIC static inline
+
+/*-**************************************************************
+*  Basic Types
+*****************************************************************/
+typedef uint8_t  BYTE;
+typedef uint16_t U16;
+typedef int16_t  S16;
+typedef uint32_t U32;
+typedef int32_t  S32;
+typedef uint64_t U64;
+typedef int64_t  S64;
+
+/*-**************************************************************
+*  Memory I/O API
+*****************************************************************/
+/*=== Static platform detection ===*/
+MEM_STATIC unsigned MEM_32bits(void);
+MEM_STATIC unsigned MEM_64bits(void);
+MEM_STATIC unsigned MEM_isLittleEndian(void);
+
+/*=== Native unaligned read/write ===*/
+MEM_STATIC U16 MEM_read16(const void* memPtr);
+MEM_STATIC U32 MEM_read32(const void* memPtr);
+MEM_STATIC U64 MEM_read64(const void* memPtr);
+MEM_STATIC size_t MEM_readST(const void* memPtr);
+
+MEM_STATIC void MEM_write16(void* memPtr, U16 value);
+MEM_STATIC void MEM_write32(void* memPtr, U32 value);
+MEM_STATIC void MEM_write64(void* memPtr, U64 value);
+
+/*=== Little endian unaligned read/write ===*/
+MEM_STATIC U16 MEM_readLE16(const void* memPtr);
+MEM_STATIC U32 MEM_readLE24(const void* memPtr);
+MEM_STATIC U32 MEM_readLE32(const void* memPtr);
+MEM_STATIC U64 MEM_readLE64(const void* memPtr);
+MEM_STATIC size_t MEM_readLEST(const void* memPtr);
+
+MEM_STATIC void MEM_writeLE16(void* memPtr, U16 val);
+MEM_STATIC void MEM_writeLE24(void* memPtr, U32 val);
+MEM_STATIC void MEM_writeLE32(void* memPtr, U32 val32);
+MEM_STATIC void MEM_writeLE64(void* memPtr, U64 val64);
+MEM_STATIC void MEM_writeLEST(void* memPtr, size_t val);
+
+/*=== Big endian unaligned read/write ===*/
+MEM_STATIC U32 MEM_readBE32(const void* memPtr);
+MEM_STATIC U64 MEM_readBE64(const void* memPtr);
+MEM_STATIC size_t MEM_readBEST(const void* memPtr);
+
+MEM_STATIC void MEM_writeBE32(void* memPtr, U32 val32);
+MEM_STATIC void MEM_writeBE64(void* memPtr, U64 val64);
+MEM_STATIC void MEM_writeBEST(void* memPtr, size_t val);
+
+/*=== Byteswap ===*/
+MEM_STATIC U32 MEM_swap32(U32 in);
+MEM_STATIC U64 MEM_swap64(U64 in);
+MEM_STATIC size_t MEM_swapST(size_t in);
+
+/*-**************************************************************
+*  Memory I/O Implementation
+*****************************************************************/
+MEM_STATIC unsigned MEM_32bits(void)
+{
+    return sizeof(size_t) == 4;
+}
+
+MEM_STATIC unsigned MEM_64bits(void)
+{
+    return sizeof(size_t) == 8;
+}
+
+#if defined(__LITTLE_ENDIAN)
+#define MEM_LITTLE_ENDIAN 1
+#else
+#define MEM_LITTLE_ENDIAN 0
+#endif
+
+MEM_STATIC unsigned MEM_isLittleEndian(void)
+{
+    return MEM_LITTLE_ENDIAN;
+}
+
+MEM_STATIC U16 MEM_read16(const void *memPtr)
+{
+    return get_unaligned((const U16 *)memPtr);
+}
+
+MEM_STATIC U32 MEM_read32(const void *memPtr)
+{
+    return get_unaligned((const U32 *)memPtr);
+}
+
+MEM_STATIC U64 MEM_read64(const void *memPtr)
+{
+    return get_unaligned((const U64 *)memPtr);
+}
+
+MEM_STATIC size_t MEM_readST(const void *memPtr)
+{
+    return get_unaligned((const size_t *)memPtr);
+}
+
+MEM_STATIC void MEM_write16(void *memPtr, U16 value)
+{
+    put_unaligned(value, (U16 *)memPtr);
+}
+
+MEM_STATIC void MEM_write32(void *memPtr, U32 value)
+{
+    put_unaligned(value, (U32 *)memPtr);
+}
+
+MEM_STATIC void MEM_write64(void *memPtr, U64 value)
+{
+    put_unaligned(value, (U64 *)memPtr);
+}
+
+/*=== Little endian r/w ===*/
+
+MEM_STATIC U16 MEM_readLE16(const void *memPtr)
+{
+    return get_unaligned_le16(memPtr);
+}
+
+MEM_STATIC void MEM_writeLE16(void *memPtr, U16 val)
+{
+    put_unaligned_le16(val, memPtr);
+}
+
+MEM_STATIC U32 MEM_readLE24(const void *memPtr)
+{
+    return MEM_readLE16(memPtr) + (((const BYTE *)memPtr)[2] << 16);
+}
+
+MEM_STATIC void MEM_writeLE24(void *memPtr, U32 val)
+{
+	MEM_writeLE16(memPtr, (U16)val);
+	((BYTE *)memPtr)[2] = (BYTE)(val >> 16);
+}
+
+MEM_STATIC U32 MEM_readLE32(const void *memPtr)
+{
+    return get_unaligned_le32(memPtr);
+}
+
+MEM_STATIC void MEM_writeLE32(void *memPtr, U32 val32)
+{
+    put_unaligned_le32(val32, memPtr);
+}
+
+MEM_STATIC U64 MEM_readLE64(const void *memPtr)
+{
+    return get_unaligned_le64(memPtr);
+}
+
+MEM_STATIC void MEM_writeLE64(void *memPtr, U64 val64)
+{
+    put_unaligned_le64(val64, memPtr);
+}
+
+MEM_STATIC size_t MEM_readLEST(const void *memPtr)
+{
+	if (MEM_32bits())
+		return (size_t)MEM_readLE32(memPtr);
+	else
+		return (size_t)MEM_readLE64(memPtr);
+}
+
+MEM_STATIC void MEM_writeLEST(void *memPtr, size_t val)
+{
+	if (MEM_32bits())
+		MEM_writeLE32(memPtr, (U32)val);
+	else
+		MEM_writeLE64(memPtr, (U64)val);
+}
+
+/*=== Big endian r/w ===*/
+
+MEM_STATIC U32 MEM_readBE32(const void *memPtr)
+{
+    return get_unaligned_be32(memPtr);
+}
+
+MEM_STATIC void MEM_writeBE32(void *memPtr, U32 val32)
+{
+    put_unaligned_be32(val32, memPtr);
+}
+
+MEM_STATIC U64 MEM_readBE64(const void *memPtr)
+{
+    return get_unaligned_be64(memPtr);
+}
+
+MEM_STATIC void MEM_writeBE64(void *memPtr, U64 val64)
+{
+    put_unaligned_be64(val64, memPtr);
+}
+
+MEM_STATIC size_t MEM_readBEST(const void *memPtr)
+{
+	if (MEM_32bits())
+		return (size_t)MEM_readBE32(memPtr);
+	else
+		return (size_t)MEM_readBE64(memPtr);
+}
+
+MEM_STATIC void MEM_writeBEST(void *memPtr, size_t val)
+{
+	if (MEM_32bits())
+		MEM_writeBE32(memPtr, (U32)val);
+	else
+		MEM_writeBE64(memPtr, (U64)val);
+}
+
+MEM_STATIC U32 MEM_swap32(U32 in)
+{
+    return swab32(in);
+}
+
+MEM_STATIC U64 MEM_swap64(U64 in)
+{
+    return swab64(in);
+}
+
+MEM_STATIC size_t MEM_swapST(size_t in)
+{
+    if (MEM_32bits())
+        return (size_t)MEM_swap32((U32)in);
+    else
+        return (size_t)MEM_swap64((U64)in);
+}
+
+#endif /* MEM_H_MODULE */
@@ -1 +0,0 @@
-*Test
@@ -1,85 +0,0 @@
-/**
- * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under both the BSD-style license (found in the
- * LICENSE file in the root directory of this source tree) and the GPLv2 (found
- * in the COPYING file in the root directory of this source tree).
- */
-
-/*
-  This program takes a file in input,
-  performs a zstd round-trip test (compression - decompress)
-  compares the result with original
-  and generates a crash (double free) on corruption detection.
-*/
-
-/*===========================================
-*   Dependencies
-*==========================================*/
-#include <stddef.h>     /* size_t */
-#include <stdlib.h>     /* malloc, free, exit */
-#include <stdio.h>      /* fprintf */
-#include <linux/zstd.h>
-
-/*===========================================
-*   Macros
-*==========================================*/
-#define MIN(a,b)  ( (a) < (b) ? (a) : (b) )
-
-static ZSTD_DCtx *dctx = NULL;
-void *dws = NULL;
-static void* rBuff = NULL;
-static size_t buffSize = 0;
-
-static void crash(int errorCode){
-    /* abort if AFL/libfuzzer, exit otherwise */
-    #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION /* could also use __AFL_COMPILER */
-        abort();
-    #else
-        exit(errorCode);
-    #endif
-}
-
-static void decompressCheck(const void* srcBuff, size_t srcBuffSize)
-{
-    size_t const neededBuffSize = 20 * srcBuffSize;
-
-    /* Allocate all buffers and contexts if not already allocated */
-    if (neededBuffSize > buffSize) {
-        free(rBuff);
-        buffSize = 0;
-
-        rBuff = malloc(neededBuffSize);
-        if (!rBuff) {
-            fprintf(stderr, "not enough memory ! \n");
-            crash(1);
-        }
-        buffSize = neededBuffSize;
-    }
-    if (!dctx) {
-        size_t const workspaceSize = ZSTD_DCtxWorkspaceBound();
-        dws = malloc(workspaceSize);
-        if (!dws) {
-            fprintf(stderr, "not enough memory ! \n");
-            crash(1);
-        }
-        dctx = ZSTD_initDCtx(dws, workspaceSize);
-        if (!dctx) {
-            fprintf(stderr, "not enough memory ! \n");
-            crash(1);
-        }
-    }
-    ZSTD_decompressDCtx(dctx, rBuff, buffSize, srcBuff, srcBuffSize);
-
-#ifndef SKIP_FREE
-    free(dws); dws = NULL; dctx = NULL;
-    free(rBuff); rBuff = NULL;
-    buffSize = 0;
-#endif
-}
-
-int LLVMFuzzerTestOneInput(const unsigned char *srcBuff, size_t srcBuffSize) {
-  decompressCheck(srcBuff, srcBuffSize);
-  return 0;
-}
@@ -1,43 +1,34 @@

-IFLAGS := -isystem include/ -I ../include/ -I ../lib/zstd/ -isystem googletest/googletest/include -isystem ../../../lib/common/
+LINUX := ../linux
+LINUX_ZSTDLIB := $(LINUX)/lib/zstd

-SOURCES := $(wildcard ../lib/zstd/*.c)
-OBJECTS := $(patsubst %.c,%.o,$(SOURCES))
+CPPFLAGS += -I$(LINUX)/include -I$(LINUX_ZSTDLIB) -Iinclude -DNDEBUG
+# Don't poison the workspace, it currently doesn't work with static allocation and workspace reuse
+CPPFLAGS += -DZSTD_ASAN_DONT_POISON_WORKSPACE

-ARFLAGS := rcs
-CXXFLAGS += -std=c++11 -g -O3 -Wcast-align
-CFLAGS += -g -O3 -Wframe-larger-than=400 -Wcast-align
-CPPFLAGS += $(IFLAGS)
+LINUX_ZSTD_MODULE     := $(wildcard $(LINUX_ZSTDLIB)/*.c)
+LINUX_ZSTD_COMMON     := $(wildcard $(LINUX_ZSTDLIB)/common/*.c) 
+LINUX_ZSTD_COMPRESS   := $(wildcard $(LINUX_ZSTDLIB)/compress/*.c) 
+LINUX_ZSTD_DECOMPRESS := $(wildcard $(LINUX_ZSTDLIB)/decompress/*.c) 
+LINUX_ZSTD_FILES      := $(LINUX_ZSTD_MODULE) $(LINUX_ZSTD_COMMON) $(LINUX_ZSTD_COMPRESS) $(LINUX_ZSTD_DECOMPRESS)
+LINUX_ZSTD_OBJECTS    := $(LINUX_ZSTD_FILES:.c=.o)

-../lib/zstd/libzstd.a: $(OBJECTS)
+liblinuxzstd.a: $(LINUX_ZSTD_OBJECTS)
 	$(AR) $(ARFLAGS) $@ $^

-DecompressCrash: DecompressCrash.o $(OBJECTS) libFuzzer.a
-	$(CXX) $(CPPFLAGS) $(CXXFLAGS) $(LDFLAGS) $^ -o $@
+test: test.c liblinuxzstd.a
+	$(CC) $(LDFLAGS) $(CPPFLAGS) $(CFLAGS) $^ -o $@

-RoundTripCrash: RoundTripCrash.o $(OBJECTS) ../lib/xxhash.o libFuzzer.a
-	$(CXX) $(CPPFLAGS) $(CXXFLAGS) $(LDFLAGS) $^ -o $@
+static_test: static_test.c
+	$(CC) $(LDFLAGS) $(CPPFLAGS) $(CFLAGS) $^ -o $@

-UserlandTest: UserlandTest.cpp ../lib/zstd/libzstd.a ../lib/xxhash.o
-	$(CXX) $(CXXFLAGS) $(CPPFLAGS) $^ googletest/build/googlemock/gtest/libgtest.a googletest/build/googlemock/gtest/libgtest_main.a -o $@
-
-XXHashUserlandTest: XXHashUserlandTest.cpp ../lib/xxhash.o ../../../lib/common/xxhash.o
-	$(CXX) $(CXXFLAGS) $(CFLAGS) $(CPPFLAGS) $^ googletest/build/googlemock/gtest/libgtest.a googletest/build/googlemock/gtest/libgtest_main.a -o $@
-
-# Install libfuzzer
-libFuzzer.a:
-	@$(RM) -rf Fuzzer
-	@git clone https://chromium.googlesource.com/chromium/llvm-project/llvm/lib/Fuzzer
-	@./Fuzzer/build.sh
-
-# Install googletest
-.PHONY: googletest
-googletest:
-	@$(RM) -rf googletest
-	@git clone https://github.com/google/googletest
-	@mkdir -p googletest/build
-	@cd googletest/build && cmake .. && $(MAKE)
+run-test: test static_test
+	./macro-test.sh
+	./test
+	./static_test

+.PHONY:
 clean:
-	$(RM) -f *.{o,a} ../lib/zstd/*.{o,a} ../lib/*.o
-	$(RM) -f DecompressCrash RoundTripCrash UserlandTest XXHashUserlandTest
+	$(RM) -f $(LINUX_ZSTDLIB)/**/*.o
+	$(RM) -f *.o *.a
+	$(RM) -f test
@@ -1,162 +0,0 @@
-/**
- * Copyright (c) 2016-present, Yann Collet, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under both the BSD-style license (found in the
- * LICENSE file in the root directory of this source tree) and the GPLv2 (found
- * in the COPYING file in the root directory of this source tree).
- */
-
-/*
-  This program takes a file in input,
-  performs a zstd round-trip test (compression - decompress)
-  compares the result with original
-  and generates a crash (double free) on corruption detection.
-*/
-
-/*===========================================
-*   Dependencies
-*==========================================*/
-#include <stddef.h>     /* size_t */
-#include <stdlib.h>     /* malloc, free, exit */
-#include <stdio.h>      /* fprintf */
-#include <linux/xxhash.h>
-#include <linux/zstd.h>
-
-/*===========================================
-*   Macros
-*==========================================*/
-#define MIN(a,b)  ( (a) < (b) ? (a) : (b) )
-
-static const int kMaxClevel = 22;
-
-static ZSTD_CCtx *cctx = NULL;
-void *cws = NULL;
-static ZSTD_DCtx *dctx = NULL;
-void *dws = NULL;
-static void* cBuff = NULL;
-static void* rBuff = NULL;
-static size_t buffSize = 0;
-
-
-/** roundTripTest() :
-*   Compresses `srcBuff` into `compressedBuff`,
-*   then decompresses `compressedBuff` into `resultBuff`.
-*   Compression level used is derived from first content byte.
-*   @return : result of decompression, which should be == `srcSize`
-*          or an error code if either compression or decompression fails.
-*   Note : `compressedBuffCapacity` should be `>= ZSTD_compressBound(srcSize)`
-*          for compression to be guaranteed to work */
-static size_t roundTripTest(void* resultBuff, size_t resultBuffCapacity,
-                            void* compressedBuff, size_t compressedBuffCapacity,
-                      const void* srcBuff, size_t srcBuffSize)
-{
-    size_t const hashLength = MIN(128, srcBuffSize);
-    unsigned const h32 = xxh32(srcBuff, hashLength, 0);
-    int const cLevel = h32 % kMaxClevel;
-    ZSTD_parameters const params = ZSTD_getParams(cLevel, srcBuffSize, 0);
-    size_t const cSize = ZSTD_compressCCtx(cctx, compressedBuff, compressedBuffCapacity, srcBuff, srcBuffSize, params);
-    if (ZSTD_isError(cSize)) {
-        fprintf(stderr, "Compression error : %u \n", ZSTD_getErrorCode(cSize));
-        return cSize;
-    }
-    return ZSTD_decompressDCtx(dctx, resultBuff, resultBuffCapacity, compressedBuff, cSize);
-}
-
-
-static size_t checkBuffers(const void* buff1, const void* buff2, size_t buffSize)
-{
-    const char* ip1 = (const char*)buff1;
-    const char* ip2 = (const char*)buff2;
-    size_t pos;
-
-    for (pos=0; pos<buffSize; pos++)
-        if (ip1[pos]!=ip2[pos])
-            break;
-
-    return pos;
-}
-
-static void crash(int errorCode){
-    /* abort if AFL/libfuzzer, exit otherwise */
-    #ifdef FUZZING_BUILD_MODE_UNSAFE_FOR_PRODUCTION /* could also use __AFL_COMPILER */
-        abort();
-    #else
-        exit(errorCode);
-    #endif
-}
-
-static void roundTripCheck(const void* srcBuff, size_t srcBuffSize)
-{
-    size_t const neededBuffSize = ZSTD_compressBound(srcBuffSize);
-
-    /* Allocate all buffers and contexts if not already allocated */
-    if (neededBuffSize > buffSize) {
-        free(cBuff);
-        free(rBuff);
-        buffSize = 0;
-
-        cBuff = malloc(neededBuffSize);
-        rBuff = malloc(neededBuffSize);
-        if (!cBuff || !rBuff) {
-            fprintf(stderr, "not enough memory ! \n");
-            crash(1);
-        }
-        buffSize = neededBuffSize;
-    }
-    if (!cctx) {
-        ZSTD_compressionParameters const params = ZSTD_getCParams(kMaxClevel, 0, 0);
-        size_t const workspaceSize = ZSTD_CCtxWorkspaceBound(params);
-        cws = malloc(workspaceSize);
-        if (!cws) {
-            fprintf(stderr, "not enough memory ! \n");
-            crash(1);
-        }
-        cctx = ZSTD_initCCtx(cws, workspaceSize);
-        if (!cctx) {
-            fprintf(stderr, "not enough memory ! \n");
-            crash(1);
-        }
-    }
-    if (!dctx) {
-        size_t const workspaceSize = ZSTD_DCtxWorkspaceBound();
-        dws = malloc(workspaceSize);
-        if (!dws) {
-            fprintf(stderr, "not enough memory ! \n");
-            crash(1);
-        }
-        dctx = ZSTD_initDCtx(dws, workspaceSize);
-        if (!dctx) {
-            fprintf(stderr, "not enough memory ! \n");
-            crash(1);
-        }
-    }
-
-    {   size_t const result = roundTripTest(rBuff, buffSize, cBuff, buffSize, srcBuff, srcBuffSize);
-        if (ZSTD_isError(result)) {
-            fprintf(stderr, "roundTripTest error : %u \n", ZSTD_getErrorCode(result));
-            crash(1);
-        }
-        if (result != srcBuffSize) {
-            fprintf(stderr, "Incorrect regenerated size : %u != %u\n", (unsigned)result, (unsigned)srcBuffSize);
-            crash(1);
-        }
-        if (checkBuffers(srcBuff, rBuff, srcBuffSize) != srcBuffSize) {
-            fprintf(stderr, "Silent decoding corruption !!!");
-            crash(1);
-        }
-    }
-
-#ifndef SKIP_FREE
-    free(cws); cws = NULL; cctx = NULL;
-    free(dws); dws = NULL; dctx = NULL;
-    free(cBuff); cBuff = NULL;
-    free(rBuff); rBuff = NULL;
-    buffSize = 0;
-#endif
-}
-
-int LLVMFuzzerTestOneInput(const unsigned char *srcBuff, size_t srcBuffSize) {
-  roundTripCheck(srcBuff, srcBuffSize);
-  return 0;
-}
@@ -1,565 +0,0 @@
-extern "C" {
-#include <linux/zstd.h>
-}
-#include <gtest/gtest.h>
-#include <memory>
-#include <string>
-#include <iostream>
-
-using namespace std;
-
-namespace {
-struct WorkspaceDeleter {
-  void *memory;
-
-  template <typename T> void operator()(T const *) { free(memory); }
-};
-
-std::unique_ptr<ZSTD_CCtx, WorkspaceDeleter>
-createCCtx(ZSTD_compressionParameters cParams) {
-  size_t const workspaceSize = ZSTD_CCtxWorkspaceBound(cParams);
-  void *workspace = malloc(workspaceSize);
-  std::unique_ptr<ZSTD_CCtx, WorkspaceDeleter> cctx{
-      ZSTD_initCCtx(workspace, workspaceSize), WorkspaceDeleter{workspace}};
-  if (!cctx) {
-    throw std::runtime_error{"Bad cctx"};
-  }
-  return cctx;
-}
-
-std::unique_ptr<ZSTD_CCtx, WorkspaceDeleter>
-createCCtx(int level, unsigned long long estimatedSrcSize = 0,
-           size_t dictSize = 0) {
-  auto const cParams = ZSTD_getCParams(level, estimatedSrcSize, dictSize);
-  return createCCtx(cParams);
-}
-
-std::unique_ptr<ZSTD_DCtx, WorkspaceDeleter>
-createDCtx() {
-  size_t const workspaceSize = ZSTD_DCtxWorkspaceBound();
-  void *workspace = malloc(workspaceSize);
-  std::unique_ptr<ZSTD_DCtx, WorkspaceDeleter> dctx{
-      ZSTD_initDCtx(workspace, workspaceSize), WorkspaceDeleter{workspace}};
-  if (!dctx) {
-    throw std::runtime_error{"Bad dctx"};
-  }
-  return dctx;
-}
-
-std::unique_ptr<ZSTD_CDict, WorkspaceDeleter>
-createCDict(std::string const& dict, ZSTD_parameters params) {
-  size_t const workspaceSize = ZSTD_CDictWorkspaceBound(params.cParams);
-  void *workspace = malloc(workspaceSize);
-  std::unique_ptr<ZSTD_CDict, WorkspaceDeleter> cdict{
-      ZSTD_initCDict(dict.data(), dict.size(), params, workspace,
-                     workspaceSize),
-      WorkspaceDeleter{workspace}};
-  if (!cdict) {
-    throw std::runtime_error{"Bad cdict"};
-  }
-  return cdict;
-}
-
-std::unique_ptr<ZSTD_CDict, WorkspaceDeleter>
-createCDict(std::string const& dict, int level) {
-  auto const params = ZSTD_getParams(level, 0, dict.size());
-  return createCDict(dict, params);
-}
-
-std::unique_ptr<ZSTD_DDict, WorkspaceDeleter>
-createDDict(std::string const& dict) {
-  size_t const workspaceSize = ZSTD_DDictWorkspaceBound();
-  void *workspace = malloc(workspaceSize);
-  std::unique_ptr<ZSTD_DDict, WorkspaceDeleter> ddict{
-      ZSTD_initDDict(dict.data(), dict.size(), workspace, workspaceSize),
-      WorkspaceDeleter{workspace}};
-  if (!ddict) {
-    throw std::runtime_error{"Bad ddict"};
-  }
-  return ddict;
-}
-
-std::unique_ptr<ZSTD_CStream, WorkspaceDeleter>
-createCStream(ZSTD_parameters params, unsigned long long pledgedSrcSize = 0) {
-  size_t const workspaceSize = ZSTD_CStreamWorkspaceBound(params.cParams);
-  void *workspace = malloc(workspaceSize);
-  std::unique_ptr<ZSTD_CStream, WorkspaceDeleter> zcs{
-      ZSTD_initCStream(params, pledgedSrcSize, workspace, workspaceSize)};
-  if (!zcs) {
-    throw std::runtime_error{"bad cstream"};
-  }
-  return zcs;
-}
-
-std::unique_ptr<ZSTD_CStream, WorkspaceDeleter>
-createCStream(ZSTD_compressionParameters cParams, ZSTD_CDict const &cdict,
-              unsigned long long pledgedSrcSize = 0) {
-  size_t const workspaceSize = ZSTD_CStreamWorkspaceBound(cParams);
-  void *workspace = malloc(workspaceSize);
-  std::unique_ptr<ZSTD_CStream, WorkspaceDeleter> zcs{
-      ZSTD_initCStream_usingCDict(&cdict, pledgedSrcSize, workspace,
-                                  workspaceSize)};
-  if (!zcs) {
-    throw std::runtime_error{"bad cstream"};
-  }
-  return zcs;
-}
-
-std::unique_ptr<ZSTD_CStream, WorkspaceDeleter>
-createCStream(int level, unsigned long long pledgedSrcSize = 0) {
-  auto const params = ZSTD_getParams(level, pledgedSrcSize, 0);
-  return createCStream(params, pledgedSrcSize);
-}
-
-std::unique_ptr<ZSTD_DStream, WorkspaceDeleter>
-createDStream(size_t maxWindowSize = (1ULL << ZSTD_WINDOWLOG_MAX),
-              ZSTD_DDict const *ddict = nullptr) {
-  size_t const workspaceSize = ZSTD_DStreamWorkspaceBound(maxWindowSize);
-  void *workspace = malloc(workspaceSize);
-  std::unique_ptr<ZSTD_DStream, WorkspaceDeleter> zds{
-      ddict == nullptr
-          ? ZSTD_initDStream(maxWindowSize, workspace, workspaceSize)
-          : ZSTD_initDStream_usingDDict(maxWindowSize, ddict, workspace,
-                                        workspaceSize)};
-  if (!zds) {
-    throw std::runtime_error{"bad dstream"};
-  }
-  return zds;
-}
-
-std::string compress(ZSTD_CCtx &cctx, std::string const &data,
-                     ZSTD_parameters params, std::string const &dict = "") {
-  std::string compressed;
-  compressed.resize(ZSTD_compressBound(data.size()));
-  size_t const rc =
-      dict.empty()
-          ? ZSTD_compressCCtx(&cctx, &compressed[0], compressed.size(),
-                              data.data(), data.size(), params)
-          : ZSTD_compress_usingDict(&cctx, &compressed[0], compressed.size(),
-                                    data.data(), data.size(), dict.data(),
-                                    dict.size(), params);
-  if (ZSTD_isError(rc)) {
-    throw std::runtime_error{"compression error"};
-  }
-  compressed.resize(rc);
-  return compressed;
-}
-
-std::string compress(ZSTD_CCtx& cctx, std::string const& data, int level, std::string const& dict = "") {
-  auto const params = ZSTD_getParams(level, 0, dict.size());
-  return compress(cctx, data, params, dict);
-}
-
-std::string decompress(ZSTD_DCtx& dctx, std::string const& compressed, size_t decompressedSize, std::string const& dict = "") {
-  std::string decompressed;
-  decompressed.resize(decompressedSize);
-  size_t const rc =
-      dict.empty()
-          ? ZSTD_decompressDCtx(&dctx, &decompressed[0], decompressed.size(),
-                                compressed.data(), compressed.size())
-          : ZSTD_decompress_usingDict(
-                &dctx, &decompressed[0], decompressed.size(), compressed.data(),
-                compressed.size(), dict.data(), dict.size());
-  if (ZSTD_isError(rc)) {
-    throw std::runtime_error{"decompression error"};
-  }
-  decompressed.resize(rc);
-  return decompressed;
-}
-
-std::string compress(ZSTD_CCtx& cctx, std::string const& data, ZSTD_CDict& cdict) {
-  std::string compressed;
-  compressed.resize(ZSTD_compressBound(data.size()));
-  size_t const rc =
-      ZSTD_compress_usingCDict(&cctx, &compressed[0], compressed.size(),
-                               data.data(), data.size(), &cdict);
-  if (ZSTD_isError(rc)) {
-    throw std::runtime_error{"compression error"};
-  }
-  compressed.resize(rc);
-  return compressed;
-}
-
-std::string decompress(ZSTD_DCtx& dctx, std::string const& compressed, size_t decompressedSize, ZSTD_DDict& ddict) {
-  std::string decompressed;
-  decompressed.resize(decompressedSize);
-  size_t const rc =
-      ZSTD_decompress_usingDDict(&dctx, &decompressed[0], decompressed.size(),
-                                 compressed.data(), compressed.size(), &ddict);
-  if (ZSTD_isError(rc)) {
-    throw std::runtime_error{"decompression error"};
-  }
-  decompressed.resize(rc);
-  return decompressed;
-}
-
-std::string compress(ZSTD_CStream& zcs, std::string const& data) {
-  std::string compressed;
-  compressed.resize(ZSTD_compressBound(data.size()));
-  ZSTD_inBuffer in = {data.data(), data.size(), 0};
-  ZSTD_outBuffer out = {&compressed[0], compressed.size(), 0};
-  while (in.pos != in.size) {
-    size_t const rc = ZSTD_compressStream(&zcs, &out, &in);
-    if (ZSTD_isError(rc)) {
-      throw std::runtime_error{"compress stream failed"};
-    }
-  }
-  size_t const rc = ZSTD_endStream(&zcs, &out);
-  if (rc != 0) {
-    throw std::runtime_error{"compress end failed"};
-  }
-  compressed.resize(out.pos);
-  return compressed;
-}
-
-std::string decompress(ZSTD_DStream &zds, std::string const &compressed,
-                       size_t decompressedSize) {
-  std::string decompressed;
-  decompressed.resize(decompressedSize);
-  ZSTD_inBuffer in = {compressed.data(), compressed.size(), 0};
-  ZSTD_outBuffer out = {&decompressed[0], decompressed.size(), 0};
-  while (in.pos != in.size) {
-    size_t const rc = ZSTD_decompressStream(&zds, &out, &in);
-    if (ZSTD_isError(rc)) {
-      throw std::runtime_error{"decompress stream failed"};
-    }
-  }
-  decompressed.resize(out.pos);
-  return decompressed;
-}
-
-std::string makeData(size_t size) {
-  std::string result;
-  result.reserve(size + 20);
-  while (result.size() < size) {
-    result += "Hello world";
-  }
-  return result;
-}
-
-std::string const kData = "Hello world";
-std::string const kPlainDict = makeData(10000);
-std::string const kZstdDict{
-    "\x37\xA4\x30\xEC\x99\x69\x58\x1C\x21\x10\xD8\x4A\x84\x01\xCC\xF3"
-    "\x3C\xCF\x9B\x25\xBB\xC9\x6E\xB2\x9B\xEC\x26\xAD\xCF\xDF\x4E\xCD"
-    "\xF3\x2C\x3A\x21\x84\x10\x42\x08\x21\x01\x33\xF1\x78\x3C\x1E\x8F"
-    "\xC7\xE3\xF1\x78\x3C\xCF\xF3\xBC\xF7\xD4\x42\x41\x41\x41\x41\x41"
-    "\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41\x41"
-    "\x41\x41\x41\x41\xA1\x50\x28\x14\x0A\x85\x42\xA1\x50\x28\x14\x0A"
-    "\x85\xA2\x28\x8A\xA2\x28\x4A\x29\x7D\x74\xE1\xE1\xE1\xE1\xE1\xE1"
-    "\xE1\xE1\xE1\xE1\xE1\xE1\xE1\xE1\xE1\xE1\xE1\xE1\xE1\xF1\x78\x3C"
-    "\x1E\x8F\xC7\xE3\xF1\x78\x9E\xE7\x79\xEF\x01\x01\x00\x00\x00\x04"
-    "\x00\x00\x00\x08\x00\x00\x00"
-    "0123456789",
-    161};
-}
-
-TEST(Block, CCtx) {
-  auto cctx = createCCtx(1);
-  auto const compressed = compress(*cctx, kData, 1);
-  auto dctx = createDCtx();
-  auto const decompressed = decompress(*dctx, compressed, kData.size());
-  EXPECT_EQ(kData, decompressed);
-}
-
-TEST(Block, NoContentSize) {
-  auto cctx = createCCtx(1);
-  auto const c = compress(*cctx, kData, 1);
-  auto const size = ZSTD_findDecompressedSize(c.data(), c.size());
-  EXPECT_EQ(ZSTD_CONTENTSIZE_UNKNOWN, size);
-}
-
-TEST(Block, ContentSize) {
-  auto cctx = createCCtx(1);
-  auto params = ZSTD_getParams(1, 0, 0);
-  params.fParams.contentSizeFlag = 1;
-  auto const c = compress(*cctx, kData, params);
-  auto const size = ZSTD_findDecompressedSize(c.data(), c.size());
-  EXPECT_EQ(kData.size(), size);
-}
-
-TEST(Block, CCtxLevelIncrease) {
-  std::string c;
-  auto cctx = createCCtx(22);
-  auto dctx = createDCtx();
-  for (int level = 1; level <= 22; ++level) {
-    auto compressed = compress(*cctx, kData, level);
-    auto const decompressed = decompress(*dctx, compressed, kData.size());
-    EXPECT_EQ(kData, decompressed);
-  }
-}
-
-TEST(Block, PlainDict) {
-  auto cctx = createCCtx(1);
-  auto const compressed = compress(*cctx, kData, 1, kPlainDict);
-  auto dctx = createDCtx();
-  EXPECT_ANY_THROW(decompress(*dctx, compressed, kData.size()));
-  auto const decompressed =
-      decompress(*dctx, compressed, kData.size(), kPlainDict);
-  EXPECT_EQ(kData, decompressed);
-}
-
-TEST(Block, ZstdDict) {
-  auto cctx = createCCtx(1);
-  auto const compressed = compress(*cctx, kData, 1, kZstdDict);
-  auto dctx = createDCtx();
-  EXPECT_ANY_THROW(decompress(*dctx, compressed, kData.size()));
-  auto const decompressed =
-      decompress(*dctx, compressed, kData.size(), kZstdDict);
-  EXPECT_EQ(kData, decompressed);
-}
-
-TEST(Block, PreprocessedPlainDict) {
-  auto cctx = createCCtx(1);
-  auto const cdict = createCDict(kPlainDict, 1);
-  auto const compressed = compress(*cctx, kData, *cdict);
-  auto dctx = createDCtx();
-  auto const ddict = createDDict(kPlainDict);
-  EXPECT_ANY_THROW(decompress(*dctx, compressed, kData.size()));
-  auto const decompressed =
-      decompress(*dctx, compressed, kData.size(), *ddict);
-  EXPECT_EQ(kData, decompressed);
-}
-
-TEST(Block, PreprocessedZstdDict) {
-  auto cctx = createCCtx(1);
-  auto const cdict = createCDict(kZstdDict, 1);
-  auto const compressed = compress(*cctx, kData, *cdict);
-  auto dctx = createDCtx();
-  auto const ddict = createDDict(kZstdDict);
-  EXPECT_ANY_THROW(decompress(*dctx, compressed, kData.size()));
-  auto const decompressed =
-      decompress(*dctx, compressed, kData.size(), *ddict);
-  EXPECT_EQ(kData, decompressed);
-}
-
-TEST(Block, ReinitializeCCtx) {
-  auto cctx = createCCtx(1);
-  {
-    auto const compressed = compress(*cctx, kData, 1);
-    auto dctx = createDCtx();
-    auto const decompressed = decompress(*dctx, compressed, kData.size());
-    EXPECT_EQ(kData, decompressed);
-  }
-  // Create the cctx with the same memory
-  auto d = cctx.get_deleter();
-  auto raw = cctx.release();
-  auto params = ZSTD_getParams(1, 0, 0);
-  cctx.reset(
-      ZSTD_initCCtx(d.memory, ZSTD_CCtxWorkspaceBound(params.cParams)));
-  // Repeat
-  {
-    auto const compressed = compress(*cctx, kData, 1);
-    auto dctx = createDCtx();
-    auto const decompressed = decompress(*dctx, compressed, kData.size());
-    EXPECT_EQ(kData, decompressed);
-  }
-}
-
-TEST(Block, ReinitializeDCtx) {
-  auto dctx = createDCtx();
-  {
-    auto cctx = createCCtx(1);
-    auto const compressed = compress(*cctx, kData, 1);
-    auto const decompressed = decompress(*dctx, compressed, kData.size());
-    EXPECT_EQ(kData, decompressed);
-  }
-  // Create the cctx with the same memory
-  auto d = dctx.get_deleter();
-  auto raw = dctx.release();
-  dctx.reset(ZSTD_initDCtx(d.memory, ZSTD_DCtxWorkspaceBound()));
-  // Repeat
-  {
-    auto cctx = createCCtx(1);
-    auto const compressed = compress(*cctx, kData, 1);
-    auto dctx = createDCtx();
-    auto const decompressed = decompress(*dctx, compressed, kData.size());
-    EXPECT_EQ(kData, decompressed);
-  }
-}
-
-TEST(Stream, Basic) {
-  auto zcs = createCStream(1);
-  auto const compressed = compress(*zcs, kData);
-  auto zds = createDStream();
-  auto const decompressed = decompress(*zds, compressed, kData.size());
-  EXPECT_EQ(kData, decompressed);
-}
-
-TEST(Stream, PlainDict) {
-  auto params = ZSTD_getParams(1, kData.size(), kPlainDict.size());
-  params.cParams.windowLog = 17;
-  auto cdict = createCDict(kPlainDict, params);
-  auto zcs = createCStream(params.cParams, *cdict, kData.size());
-  auto const compressed = compress(*zcs, kData);
-  auto const contentSize =
-      ZSTD_findDecompressedSize(compressed.data(), compressed.size());
-  EXPECT_ANY_THROW(decompress(*createDStream(), compressed, kData.size()));
-  auto ddict = createDDict(kPlainDict);
-  auto zds = createDStream(1 << 17, ddict.get());
-  auto const decompressed = decompress(*zds, compressed, kData.size());
-  EXPECT_EQ(kData, decompressed);
-}
-
-TEST(Stream, ZstdDict) {
-  auto params = ZSTD_getParams(1, 0, 0);
-  params.cParams.windowLog = 17;
-  auto cdict = createCDict(kZstdDict, 1);
-  auto zcs = createCStream(params.cParams, *cdict);
-  auto const compressed = compress(*zcs, kData);
-  EXPECT_ANY_THROW(decompress(*createDStream(), compressed, kData.size()));
-  auto ddict = createDDict(kZstdDict);
-  auto zds = createDStream(1 << 17, ddict.get());
-  auto const decompressed = decompress(*zds, compressed, kData.size());
-  EXPECT_EQ(kData, decompressed);
-}
-
-TEST(Stream, ResetCStream) {
-  auto zcs = createCStream(1);
-  auto zds = createDStream();
-  {
-    auto const compressed = compress(*zcs, kData);
-    auto const decompressed = decompress(*zds, compressed, kData.size());
-    EXPECT_EQ(kData, decompressed);
-  }
-  {
-    ZSTD_resetCStream(zcs.get(), 0);
-    auto const compressed = compress(*zcs, kData);
-    auto const decompressed = decompress(*zds, compressed, kData.size());
-    EXPECT_EQ(kData, decompressed);
-  }
-}
-
-TEST(Stream, ResetDStream) {
-  auto zcs = createCStream(1);
-  auto zds = createDStream();
-  auto const compressed = compress(*zcs, kData);
-  EXPECT_ANY_THROW(decompress(*zds, kData, kData.size()));
-  EXPECT_ANY_THROW(decompress(*zds, compressed, kData.size()));
-  ZSTD_resetDStream(zds.get());
-  auto const decompressed = decompress(*zds, compressed, kData.size());
-  EXPECT_EQ(kData, decompressed);
-}
-
-TEST(Stream, Flush) {
-  auto zcs = createCStream(1);
-  auto zds = createDStream();
-  std::string compressed;
-  {
-    compressed.resize(ZSTD_compressBound(kData.size()));
-    ZSTD_inBuffer in = {kData.data(), kData.size(), 0};
-    ZSTD_outBuffer out = {&compressed[0], compressed.size(), 0};
-    while (in.pos != in.size) {
-      size_t const rc = ZSTD_compressStream(zcs.get(), &out, &in);
-      if (ZSTD_isError(rc)) {
-        throw std::runtime_error{"compress stream failed"};
-      }
-    }
-    EXPECT_EQ(0, out.pos);
-    size_t const rc = ZSTD_flushStream(zcs.get(), &out);
-    if (rc != 0) {
-      throw std::runtime_error{"compress end failed"};
-    }
-    compressed.resize(out.pos);
-    EXPECT_LT(0, out.pos);
-  }
-  std::string decompressed;
-  {
-    decompressed.resize(kData.size());
-    ZSTD_inBuffer in = {compressed.data(), compressed.size(), 0};
-    ZSTD_outBuffer out = {&decompressed[0], decompressed.size(), 0};
-    while (in.pos != in.size) {
-      size_t const rc = ZSTD_decompressStream(zds.get(), &out, &in);
-      if (ZSTD_isError(rc)) {
-        throw std::runtime_error{"decompress stream failed"};
-      }
-    }
-  }
-  EXPECT_EQ(kData, decompressed);
-}
-
-TEST(Stream, DStreamLevelIncrease) {
-  auto zds = createDStream();
-  for (int level = 1; level <= 22; ++level) {
-    auto zcs = createCStream(level);
-    auto compressed = compress(*zcs, kData);
-    ZSTD_resetDStream(zds.get());
-    auto const decompressed = decompress(*zds, compressed, kData.size());
-    EXPECT_EQ(kData, decompressed);
-  }
-}
-
-#define TEST_SYMBOL(symbol)                                                    \
-  do {                                                                         \
-    extern void *__##symbol;                                                   \
-    EXPECT_NE((void *)0, __##symbol);                                          \
-  } while (0)
-
-TEST(API, Symbols) {
-  TEST_SYMBOL(ZSTD_CCtxWorkspaceBound);
-  TEST_SYMBOL(ZSTD_initCCtx);
-  TEST_SYMBOL(ZSTD_compressCCtx);
-  TEST_SYMBOL(ZSTD_compress_usingDict);
-  TEST_SYMBOL(ZSTD_DCtxWorkspaceBound);
-  TEST_SYMBOL(ZSTD_initDCtx);
-  TEST_SYMBOL(ZSTD_decompressDCtx);
-  TEST_SYMBOL(ZSTD_decompress_usingDict);
-
-  TEST_SYMBOL(ZSTD_CDictWorkspaceBound);
-  TEST_SYMBOL(ZSTD_initCDict);
-  TEST_SYMBOL(ZSTD_compress_usingCDict);
-  TEST_SYMBOL(ZSTD_DDictWorkspaceBound);
-  TEST_SYMBOL(ZSTD_initDDict);
-  TEST_SYMBOL(ZSTD_decompress_usingDDict);
-
-  TEST_SYMBOL(ZSTD_CStreamWorkspaceBound);
-  TEST_SYMBOL(ZSTD_initCStream);
-  TEST_SYMBOL(ZSTD_initCStream_usingCDict);
-  TEST_SYMBOL(ZSTD_resetCStream);
-  TEST_SYMBOL(ZSTD_compressStream);
-  TEST_SYMBOL(ZSTD_flushStream);
-  TEST_SYMBOL(ZSTD_endStream);
-  TEST_SYMBOL(ZSTD_CStreamInSize);
-  TEST_SYMBOL(ZSTD_CStreamOutSize);
-  TEST_SYMBOL(ZSTD_DStreamWorkspaceBound);
-  TEST_SYMBOL(ZSTD_initDStream);
-  TEST_SYMBOL(ZSTD_initDStream_usingDDict);
-  TEST_SYMBOL(ZSTD_resetDStream);
-  TEST_SYMBOL(ZSTD_decompressStream);
-  TEST_SYMBOL(ZSTD_DStreamInSize);
-  TEST_SYMBOL(ZSTD_DStreamOutSize);
-
-  TEST_SYMBOL(ZSTD_findFrameCompressedSize);
-  TEST_SYMBOL(ZSTD_getFrameContentSize);
-  TEST_SYMBOL(ZSTD_findDecompressedSize);
-
-  TEST_SYMBOL(ZSTD_getCParams);
-  TEST_SYMBOL(ZSTD_getParams);
-  TEST_SYMBOL(ZSTD_checkCParams);
-  TEST_SYMBOL(ZSTD_adjustCParams);
-
-  TEST_SYMBOL(ZSTD_isFrame);
-  TEST_SYMBOL(ZSTD_getDictID_fromDict);
-  TEST_SYMBOL(ZSTD_getDictID_fromDDict);
-  TEST_SYMBOL(ZSTD_getDictID_fromFrame);
-
-  TEST_SYMBOL(ZSTD_compressBegin);
-  TEST_SYMBOL(ZSTD_compressBegin_usingDict);
-  TEST_SYMBOL(ZSTD_compressBegin_advanced);
-  TEST_SYMBOL(ZSTD_copyCCtx);
-  TEST_SYMBOL(ZSTD_compressBegin_usingCDict);
-  TEST_SYMBOL(ZSTD_compressContinue);
-  TEST_SYMBOL(ZSTD_compressEnd);
-  TEST_SYMBOL(ZSTD_getFrameParams);
-  TEST_SYMBOL(ZSTD_decompressBegin);
-  TEST_SYMBOL(ZSTD_decompressBegin_usingDict);
-  TEST_SYMBOL(ZSTD_copyDCtx);
-  TEST_SYMBOL(ZSTD_nextSrcSizeToDecompress);
-  TEST_SYMBOL(ZSTD_decompressContinue);
-  TEST_SYMBOL(ZSTD_nextInputType);
-
-  TEST_SYMBOL(ZSTD_getBlockSizeMax);
-  TEST_SYMBOL(ZSTD_compressBlock);
-  TEST_SYMBOL(ZSTD_decompressBlock);
-  TEST_SYMBOL(ZSTD_insertBlock);
-}
@@ -1,166 +0,0 @@
-extern "C" {
-#include <linux/errno.h>
-#include <linux/xxhash.h>
-}
-#include <gtest/gtest.h>
-#include <array>
-#include <iostream>
-#include <memory>
-#include <string>
-#define XXH_STATIC_LINKING_ONLY
-#include <xxhash.h>
-
-using namespace std;
-
-namespace {
-const std::array<std::string, 11> kTestInputs = {
-  "",
-  "0",
-  "01234",
-  "0123456789abcde",
-  "0123456789abcdef",
-  "0123456789abcdef0",
-  "0123456789abcdef0123",
-  "0123456789abcdef0123456789abcde",
-  "0123456789abcdef0123456789abcdef",
-  "0123456789abcdef0123456789abcdef0",
-  "0123456789abcdef0123456789abcdef0123456789abcdef0123456789abcdef",
-};
-
-bool testXXH32(const void *input, const size_t length, uint32_t seed) {
-  return XXH32(input, length, seed) == xxh32(input, length, seed);
-}
-
-bool testXXH64(const void *input, const size_t length, uint32_t seed) {
-  return XXH64(input, length, seed) == xxh64(input, length, seed);
-}
-
-class XXH32State {
-  struct xxh32_state kernelState;
-  XXH32_state_t state;
-
-public:
-  explicit XXH32State(const uint32_t seed) { reset(seed); }
-  XXH32State(XXH32State const& other) noexcept {
-    xxh32_copy_state(&kernelState, &other.kernelState);
-    XXH32_copyState(&state, &other.state);
-  }
-  XXH32State& operator=(XXH32State const& other) noexcept {
-    xxh32_copy_state(&kernelState, &other.kernelState);
-    XXH32_copyState(&state, &other.state);
-    return *this;
-  }
-
-  void reset(const uint32_t seed) {
-    xxh32_reset(&kernelState, seed);
-    EXPECT_EQ(0, XXH32_reset(&state, seed));
-  }
-
-  void update(const void *input, const size_t length) {
-    EXPECT_EQ(0, xxh32_update(&kernelState, input, length));
-    EXPECT_EQ(0, (int)XXH32_update(&state, input, length));
-  }
-
-  bool testDigest() const {
-    return xxh32_digest(&kernelState) == XXH32_digest(&state);
-  }
-};
-
-class XXH64State {
-  struct xxh64_state kernelState;
-  XXH64_state_t state;
-
-public:
-  explicit XXH64State(const uint64_t seed) { reset(seed); }
-  XXH64State(XXH64State const& other) noexcept {
-    xxh64_copy_state(&kernelState, &other.kernelState);
-    XXH64_copyState(&state, &other.state);
-  }
-  XXH64State& operator=(XXH64State const& other) noexcept {
-    xxh64_copy_state(&kernelState, &other.kernelState);
-    XXH64_copyState(&state, &other.state);
-    return *this;
-  }
-
-  void reset(const uint64_t seed) {
-    xxh64_reset(&kernelState, seed);
-    EXPECT_EQ(0, XXH64_reset(&state, seed));
-  }
-
-  void update(const void *input, const size_t length) {
-    EXPECT_EQ(0, xxh64_update(&kernelState, input, length));
-    EXPECT_EQ(0, (int)XXH64_update(&state, input, length));
-  }
-
-  bool testDigest() const {
-    return xxh64_digest(&kernelState) == XXH64_digest(&state);
-  }
-};
-}
-
-TEST(Simple, Null) {
-  EXPECT_TRUE(testXXH32(NULL, 0, 0));
-  EXPECT_TRUE(testXXH64(NULL, 0, 0));
-}
-
-TEST(Stream, Null) {
-  struct xxh32_state state32;
-  xxh32_reset(&state32, 0);
-  EXPECT_EQ(-EINVAL, xxh32_update(&state32, NULL, 0));
-
-  struct xxh64_state state64;
-  xxh64_reset(&state64, 0);
-  EXPECT_EQ(-EINVAL, xxh64_update(&state64, NULL, 0));
-}
-
-TEST(Simple, TestInputs) {
-  for (uint32_t seed = 0; seed < 100000; seed = (seed + 1) * 3) {
-    for (auto const input : kTestInputs) {
-      EXPECT_TRUE(testXXH32(input.data(), input.size(), seed));
-      EXPECT_TRUE(testXXH64(input.data(), input.size(), (uint64_t)seed));
-    }
-  }
-}
-
-TEST(Stream, TestInputs) {
-  for (uint32_t seed = 0; seed < 100000; seed = (seed + 1) * 3) {
-    for (auto const input : kTestInputs) {
-      XXH32State s32(seed);
-      XXH64State s64(seed);
-      s32.update(input.data(), input.size());
-      s64.update(input.data(), input.size());
-      EXPECT_TRUE(s32.testDigest());
-      EXPECT_TRUE(s64.testDigest());
-    }
-  }
-}
-
-TEST(Stream, MultipleTestInputs) {
-  for (uint32_t seed = 0; seed < 100000; seed = (seed + 1) * 3) {
-    XXH32State s32(seed);
-    XXH64State s64(seed);
-    for (auto const input : kTestInputs) {
-      s32.update(input.data(), input.size());
-      s64.update(input.data(), input.size());
-    }
-    EXPECT_TRUE(s32.testDigest());
-    EXPECT_TRUE(s64.testDigest());
-  }
-}
-
-TEST(Stream, CopyState) {
-  for (uint32_t seed = 0; seed < 100000; seed = (seed + 1) * 3) {
-    XXH32State s32(seed);
-    XXH64State s64(seed);
-    for (auto const input : kTestInputs) {
-      auto t32(s32);
-      t32.update(input.data(), input.size());
-      s32 = t32;
-      auto t64(s64);
-      t64.update(input.data(), input.size());
-      s64 = t64;
-    }
-    EXPECT_TRUE(s32.testDigest());
-    EXPECT_TRUE(s64.testDigest());
-  }
-}
@@ -2,7 +2,6 @@
 #define ASM_UNALIGNED_H

 #include <assert.h>
-#include <linux/string.h>
 #include <linux/types.h>

 #define _LITTLE_ENDIAN 1
@@ -33,7 +32,7 @@ static uint64_t _swap64(uint64_t in)
 static uint16_t get_unaligned_le16(const void* memPtr)
 {
    uint16_t val;
-    memcpy(&val, memPtr, sizeof(val));
+    __builtin_memcpy(&val, memPtr, sizeof(val));
    if (!_isLittleEndian()) _swap16(val);
    return val;
 }
@@ -41,7 +40,7 @@ static uint16_t get_unaligned_le16(const void* memPtr)
 static uint32_t get_unaligned_le32(const void* memPtr)
 {
    uint32_t val;
-    memcpy(&val, memPtr, sizeof(val));
+    __builtin_memcpy(&val, memPtr, sizeof(val));
    if (!_isLittleEndian()) _swap32(val);
    return val;
 }
@@ -49,7 +48,7 @@ static uint32_t get_unaligned_le32(const void* memPtr)
 static uint64_t get_unaligned_le64(const void* memPtr)
 {
    uint64_t val;
-    memcpy(&val, memPtr, sizeof(val));
+    __builtin_memcpy(&val, memPtr, sizeof(val));
    if (!_isLittleEndian()) _swap64(val);
    return val;
 }
@@ -57,26 +56,26 @@ static uint64_t get_unaligned_le64(const void* memPtr)
 static void put_unaligned_le16(uint16_t value, void* memPtr)
 {
    if (!_isLittleEndian()) value = _swap16(value);
-    memcpy(memPtr, &value, sizeof(value));
+    __builtin_memcpy(memPtr, &value, sizeof(value));
 }

 static void put_unaligned_le32(uint32_t value, void* memPtr)
 {
    if (!_isLittleEndian()) value = _swap32(value);
-    memcpy(memPtr, &value, sizeof(value));
+    __builtin_memcpy(memPtr, &value, sizeof(value));
 }

 static void put_unaligned_le64(uint64_t value, void* memPtr)
 {
    if (!_isLittleEndian()) value = _swap64(value);
-    memcpy(memPtr, &value, sizeof(value));
+    __builtin_memcpy(memPtr, &value, sizeof(value));
 }

 /* big endian */
 static uint32_t get_unaligned_be32(const void* memPtr)
 {
    uint32_t val;
-    memcpy(&val, memPtr, sizeof(val));
+    __builtin_memcpy(&val, memPtr, sizeof(val));
    if (_isLittleEndian()) _swap32(val);
    return val;
 }
@@ -84,7 +83,7 @@ static uint32_t get_unaligned_be32(const void* memPtr)
 static uint64_t get_unaligned_be64(const void* memPtr)
 {
    uint64_t val;
-    memcpy(&val, memPtr, sizeof(val));
+    __builtin_memcpy(&val, memPtr, sizeof(val));
    if (_isLittleEndian()) _swap64(val);
    return val;
 }
@@ -92,13 +91,13 @@ static uint64_t get_unaligned_be64(const void* memPtr)
 static void put_unaligned_be32(uint32_t value, void* memPtr)
 {
    if (_isLittleEndian()) value = _swap32(value);
-    memcpy(memPtr, &value, sizeof(value));
+    __builtin_memcpy(memPtr, &value, sizeof(value));
 }

 static void put_unaligned_be64(uint64_t value, void* memPtr)
 {
    if (_isLittleEndian()) value = _swap64(value);
-    memcpy(memPtr, &value, sizeof(value));
+    __builtin_memcpy(memPtr, &value, sizeof(value));
 }

 /* generic */
@@ -1,12 +1,17 @@
-#ifndef LINUX_COMPILER_H_
-#define LINUX_COMPILER_H_
+/*
+ * Copyright (c) 2016-2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+#ifndef LINUX_COMPILER_H
+#define LINUX_COMPILER_H

-#ifndef __always_inline
-#  define __always_inline inline
+#ifndef inline
+#define inline __inline __attribute__((unused))
 #endif

-#ifndef noinline
-#  define noinline __attribute__((__noinline__))
 #endif
-
-#endif // LINUX_COMPILER_H_
@@ -1,6 +1,15 @@
-#ifndef LINUX_ERRNO_H_
-#define LINUX_ERRNO_H_
+/*
+ * Copyright (c) 2016-2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+#ifndef LINUX_ERRNO_H
+#define LINUX_ERRNO_H

 #define EINVAL 22

-#endif // LINUX_ERRNO_H_
+#endif
@@ -1,16 +1,15 @@
-#ifndef LINUX_KERNEL_H_
-#define LINUX_KERNEL_H_
+/*
+ * Copyright (c) 2016-2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+#ifndef LINUX_KERNEL_H
+#define LINUX_KERNEL_H

-#define ALIGN(x, a) ({                                                         \
-    typeof(x) const __xe = (x);                                                \
-    typeof(a) const __ae = (a);                                                \
-    typeof(a) const __m = __ae - 1;                                            \
-    typeof(x) const __r = __xe & __m;                                          \
-    __xe + (__r ? (__ae - __r) : 0);                                           \
-  })
+#define WARN_ON(x)

-#define PTR_ALIGN(p, a) (typeof(p))ALIGN((unsigned long long)(p), (a))
-
-#define current Something that doesn't compile :)
-
-#endif // LINUX_KERNEL_H_
+#endif
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2016-2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+#ifndef LINUX_LIMITS_H
+#define LINUX_LIMITS_H
+
+#include <limits.h>
+
+#endif
@@ -1,11 +1,15 @@
+/*
+ * Copyright (c) 2016-2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
 #ifndef LINUX_MATH64_H
 #define LINUX_MATH64_H

-#include <stdint.h>
-
-static uint64_t div_u64(uint64_t n, uint32_t d)
-{
-  return n / d;
-}
+#define div_u64(dividend, divisor) ((dividend) / (divisor))

 #endif
@@ -1,10 +1,18 @@
-#ifndef LINUX_MODULE_H_
-#define LINUX_MODULE_H_
+/*
+ * Copyright (c) 2016-2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+#ifndef LINUX_MODULE_H
+#define LINUX_MODULE_H

 #define EXPORT_SYMBOL(symbol)                                                  \
  void* __##symbol = symbol
-#define MODULE_LICENSE(license) static char const *const LICENSE = license
-#define MODULE_DESCRIPTION(description)                                        \
-  static char const *const DESCRIPTION = description
+#define MODULE_LICENSE(license)
+#define MODULE_DESCRIPTION(description)

-#endif // LINUX_MODULE_H_
+#endif
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2016-2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+#ifndef LINUX_PRINTK_H
+#define LINUX_PRINTK_H
+
+#define pr_debug(...)
+
+#endif
@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2016-2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+#ifndef LINUX_STDDEF_H
+#define LINUX_STDDEF_H
+
+#include <stddef.h>
+
+#endif
@@ -1 +0,0 @@
-#include <string.h>
@@ -0,0 +1,16 @@
+/*
+ * Copyright (c) 2016-2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+#ifndef LINUX_SWAB_H
+#define LINUX_SWAB_H
+
+#define swab32(x) __builtin_bswap32((x))
+#define swab64(x) __builtin_bswap64((x))
+
+#endif
@@ -1,2 +1,16 @@
+/*
+ * Copyright (c) 2016-2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+#ifndef LINUX_TYPES_H
+#define LINUX_TYPES_H
+
 #include <stddef.h>
 #include <stdint.h>
+
+#endif
@@ -34,16 +34,273 @@
 * ("BSD").
 *
 * You can contact the author at:
- * - xxHash homepage: http://cyan4973.github.io/xxHash/
+ * - xxHash homepage: https://cyan4973.github.io/xxHash/
+ * - xxHash source repository: https://github.com/Cyan4973/xxHash
+ */
+
+/*
+ * Notice extracted from xxHash homepage:
+ *
+ * xxHash is an extremely fast Hash algorithm, running at RAM speed limits.
+ * It also successfully passes all tests from the SMHasher suite.
+ *
+ * Comparison (single thread, Windows Seven 32 bits, using SMHasher on a Core 2
+ * Duo @3GHz)
+ *
+ * Name            Speed       Q.Score   Author
+ * xxHash          5.4 GB/s     10
+ * CrapWow         3.2 GB/s      2       Andrew
+ * MumurHash 3a    2.7 GB/s     10       Austin Appleby
+ * SpookyHash      2.0 GB/s     10       Bob Jenkins
+ * SBox            1.4 GB/s      9       Bret Mulvey
+ * Lookup3         1.2 GB/s      9       Bob Jenkins
+ * SuperFastHash   1.2 GB/s      1       Paul Hsieh
+ * CityHash64      1.05 GB/s    10       Pike & Alakuijala
+ * FNV             0.55 GB/s     5       Fowler, Noll, Vo
+ * CRC32           0.43 GB/s     9
+ * MD5-32          0.33 GB/s    10       Ronald L. Rivest
+ * SHA1-32         0.28 GB/s    10
+ *
+ * Q.Score is a measure of quality of the hash function.
+ * It depends on successfully passing SMHasher test set.
+ * 10 is a perfect score.
+ *
+ * A 64-bits version, named xxh64 offers much better speed,
+ * but for 64-bits applications only.
+ * Name     Speed on 64 bits    Speed on 32 bits
+ * xxh64       13.8 GB/s            1.9 GB/s
+ * xxh32        6.8 GB/s            6.0 GB/s
+ */
+
+#ifndef XXHASH_H
+#define XXHASH_H
+
+#include <linux/types.h>
+
+#define XXH_API static inline __attribute__((unused))
+/*-****************************
+ * Simple Hash Functions
+ *****************************/
+
+/**
+ * xxh32() - calculate the 32-bit hash of the input with a given seed.
+ *
+ * @input:  The data to hash.
+ * @length: The length of the data to hash.
+ * @seed:   The seed can be used to alter the result predictably.
+ *
+ * Speed on Core 2 Duo @ 3 GHz (single thread, SMHasher benchmark) : 5.4 GB/s
+ *
+ * Return:  The 32-bit hash of the data.
+ */
+XXH_API uint32_t xxh32(const void *input, size_t length, uint32_t seed);
+
+/**
+ * xxh64() - calculate the 64-bit hash of the input with a given seed.
+ *
+ * @input:  The data to hash.
+ * @length: The length of the data to hash.
+ * @seed:   The seed can be used to alter the result predictably.
+ *
+ * This function runs 2x faster on 64-bit systems, but slower on 32-bit systems.
+ *
+ * Return:  The 64-bit hash of the data.
+ */
+XXH_API uint64_t xxh64(const void *input, size_t length, uint64_t seed);
+
+/**
+ * xxhash() - calculate wordsize hash of the input with a given seed
+ * @input:  The data to hash.
+ * @length: The length of the data to hash.
+ * @seed:   The seed can be used to alter the result predictably.
+ *
+ * If the hash does not need to be comparable between machines with
+ * different word sizes, this function will call whichever of xxh32()
+ * or xxh64() is faster.
+ *
+ * Return:  wordsize hash of the data.
+ */
+
+static inline unsigned long xxhash(const void *input, size_t length,
+				   uint64_t seed)
+{
+#if BITS_PER_LONG == 64
+       return xxh64(input, length, seed);
+#else
+       return xxh32(input, length, seed);
+#endif
+}
+
+/*-****************************
+ * Streaming Hash Functions
+ *****************************/
+
+/*
+ * These definitions are only meant to allow allocation of XXH state
+ * statically, on stack, or in a struct for example.
+ * Do not use members directly.
+ */
+
+/**
+ * struct xxh32_state - private xxh32 state, do not use members directly
+ */
+struct xxh32_state {
+	uint32_t total_len_32;
+	uint32_t large_len;
+	uint32_t v1;
+	uint32_t v2;
+	uint32_t v3;
+	uint32_t v4;
+	uint32_t mem32[4];
+	uint32_t memsize;
+};
+
+/**
+ * struct xxh32_state - private xxh64 state, do not use members directly
+ */
+struct xxh64_state {
+	uint64_t total_len;
+	uint64_t v1;
+	uint64_t v2;
+	uint64_t v3;
+	uint64_t v4;
+	uint64_t mem64[4];
+	uint32_t memsize;
+};
+
+/**
+ * xxh32_reset() - reset the xxh32 state to start a new hashing operation
+ *
+ * @state: The xxh32 state to reset.
+ * @seed:  Initialize the hash state with this seed.
+ *
+ * Call this function on any xxh32_state to prepare for a new hashing operation.
+ */
+XXH_API void xxh32_reset(struct xxh32_state *state, uint32_t seed);
+
+/**
+ * xxh32_update() - hash the data given and update the xxh32 state
+ *
+ * @state:  The xxh32 state to update.
+ * @input:  The data to hash.
+ * @length: The length of the data to hash.
+ *
+ * After calling xxh32_reset() call xxh32_update() as many times as necessary.
+ *
+ * Return:  Zero on success, otherwise an error code.
+ */
+XXH_API int xxh32_update(struct xxh32_state *state, const void *input, size_t length);
+
+/**
+ * xxh32_digest() - produce the current xxh32 hash
+ *
+ * @state: Produce the current xxh32 hash of this state.
+ *
+ * A hash value can be produced at any time. It is still possible to continue
+ * inserting input into the hash state after a call to xxh32_digest(), and
+ * generate new hashes later on, by calling xxh32_digest() again.
+ *
+ * Return: The xxh32 hash stored in the state.
+ */
+XXH_API uint32_t xxh32_digest(const struct xxh32_state *state);
+
+/**
+ * xxh64_reset() - reset the xxh64 state to start a new hashing operation
+ *
+ * @state: The xxh64 state to reset.
+ * @seed:  Initialize the hash state with this seed.
+ */
+XXH_API void xxh64_reset(struct xxh64_state *state, uint64_t seed);
+
+/**
+ * xxh64_update() - hash the data given and update the xxh64 state
+ * @state:  The xxh64 state to update.
+ * @input:  The data to hash.
+ * @length: The length of the data to hash.
+ *
+ * After calling xxh64_reset() call xxh64_update() as many times as necessary.
+ *
+ * Return:  Zero on success, otherwise an error code.
+ */
+XXH_API int xxh64_update(struct xxh64_state *state, const void *input, size_t length);
+
+/**
+ * xxh64_digest() - produce the current xxh64 hash
+ *
+ * @state: Produce the current xxh64 hash of this state.
+ *
+ * A hash value can be produced at any time. It is still possible to continue
+ * inserting input into the hash state after a call to xxh64_digest(), and
+ * generate new hashes later on, by calling xxh64_digest() again.
+ *
+ * Return: The xxh64 hash stored in the state.
+ */
+XXH_API uint64_t xxh64_digest(const struct xxh64_state *state);
+
+/*-**************************
+ * Utils
+ ***************************/
+
+/**
+ * xxh32_copy_state() - copy the source state into the destination state
+ *
+ * @src: The source xxh32 state.
+ * @dst: The destination xxh32 state.
+ */
+XXH_API void xxh32_copy_state(struct xxh32_state *dst, const struct xxh32_state *src);
+
+/**
+ * xxh64_copy_state() - copy the source state into the destination state
+ *
+ * @src: The source xxh64 state.
+ * @dst: The destination xxh64 state.
+ */
+XXH_API void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src);
+
+/*
+ * xxHash - Extremely Fast Hash algorithm
+ * Copyright (C) 2012-2016, Yann Collet.
+ *
+ * BSD 2-Clause License (http://www.opensource.org/licenses/bsd-license.php)
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *   * Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ *   * Redistributions in binary form must reproduce the above
+ *     copyright notice, this list of conditions and the following disclaimer
+ *     in the documentation and/or other materials provided with the
+ *     distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *
+ * This program is free software; you can redistribute it and/or modify it under
+ * the terms of the GNU General Public License version 2 as published by the
+ * Free Software Foundation. This program is dual-licensed; you may select
+ * either version 2 of the GNU General Public License ("GPL") or BSD license
+ * ("BSD").
+ *
+ * You can contact the author at:
+ * - xxHash homepage: https://cyan4973.github.io/xxHash/
 * - xxHash source repository: https://github.com/Cyan4973/xxHash
 */

 #include <asm/unaligned.h>
 #include <linux/errno.h>
-#include <linux/compiler.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
-#include <linux/string.h>
 #include <linux/xxhash.h>

 /*-*************************************
@@ -76,17 +333,15 @@ static const uint64_t PRIME64_5 =  2870177450012600261ULL;
 /*-**************************
 *  Utils
 ***************************/
-void xxh32_copy_state(struct xxh32_state *dst, const struct xxh32_state *src)
+XXH_API void xxh32_copy_state(struct xxh32_state *dst, const struct xxh32_state *src)
 {
-	memcpy(dst, src, sizeof(*dst));
+	__builtin_memcpy(dst, src, sizeof(*dst));
 }
-EXPORT_SYMBOL(xxh32_copy_state);

-void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src)
+XXH_API void xxh64_copy_state(struct xxh64_state *dst, const struct xxh64_state *src)
 {
-	memcpy(dst, src, sizeof(*dst));
+	__builtin_memcpy(dst, src, sizeof(*dst));
 }
-EXPORT_SYMBOL(xxh64_copy_state);

 /*-***************************
 * Simple Hash Functions
@@ -99,7 +354,7 @@ static uint32_t xxh32_round(uint32_t seed, const uint32_t input)
 	return seed;
 }

-uint32_t xxh32(const void *input, const size_t len, const uint32_t seed)
+XXH_API uint32_t xxh32(const void *input, const size_t len, const uint32_t seed)
 {
 	const uint8_t *p = (const uint8_t *)input;
 	const uint8_t *b_end = p + len;
@@ -151,7 +406,6 @@ uint32_t xxh32(const void *input, const size_t len, const uint32_t seed)

 	return h32;
 }
-EXPORT_SYMBOL(xxh32);

 static uint64_t xxh64_round(uint64_t acc, const uint64_t input)
 {
@@ -169,7 +423,7 @@ static uint64_t xxh64_merge_round(uint64_t acc, uint64_t val)
 	return acc;
 }

-uint64_t xxh64(const void *input, const size_t len, const uint64_t seed)
+XXH_API uint64_t xxh64(const void *input, const size_t len, const uint64_t seed)
 {
 	const uint8_t *p = (const uint8_t *)input;
 	const uint8_t *const b_end = p + len;
@@ -234,40 +488,37 @@ uint64_t xxh64(const void *input, const size_t len, const uint64_t seed)

 	return h64;
 }
-EXPORT_SYMBOL(xxh64);

 /*-**************************************************
 * Advanced Hash Functions
 ***************************************************/
-void xxh32_reset(struct xxh32_state *statePtr, const uint32_t seed)
+XXH_API void xxh32_reset(struct xxh32_state *statePtr, const uint32_t seed)
 {
 	/* use a local state for memcpy() to avoid strict-aliasing warnings */
 	struct xxh32_state state;

-	memset(&state, 0, sizeof(state));
+	__builtin_memset(&state, 0, sizeof(state));
 	state.v1 = seed + PRIME32_1 + PRIME32_2;
 	state.v2 = seed + PRIME32_2;
 	state.v3 = seed + 0;
 	state.v4 = seed - PRIME32_1;
-	memcpy(statePtr, &state, sizeof(state));
+	__builtin_memcpy(statePtr, &state, sizeof(state));
 }
-EXPORT_SYMBOL(xxh32_reset);

-void xxh64_reset(struct xxh64_state *statePtr, const uint64_t seed)
+XXH_API void xxh64_reset(struct xxh64_state *statePtr, const uint64_t seed)
 {
 	/* use a local state for memcpy() to avoid strict-aliasing warnings */
 	struct xxh64_state state;

-	memset(&state, 0, sizeof(state));
+	__builtin_memset(&state, 0, sizeof(state));
 	state.v1 = seed + PRIME64_1 + PRIME64_2;
 	state.v2 = seed + PRIME64_2;
 	state.v3 = seed + 0;
 	state.v4 = seed - PRIME64_1;
-	memcpy(statePtr, &state, sizeof(state));
+	__builtin_memcpy(statePtr, &state, sizeof(state));
 }
-EXPORT_SYMBOL(xxh64_reset);

-int xxh32_update(struct xxh32_state *state, const void *input, const size_t len)
+XXH_API int xxh32_update(struct xxh32_state *state, const void *input, const size_t len)
 {
 	const uint8_t *p = (const uint8_t *)input;
 	const uint8_t *const b_end = p + len;
@@ -279,7 +530,7 @@ int xxh32_update(struct xxh32_state *state, const void *input, const size_t len)
 	state->large_len |= (len >= 16) | (state->total_len_32 >= 16);

 	if (state->memsize + len < 16) { /* fill in tmp buffer */
-		memcpy((uint8_t *)(state->mem32) + state->memsize, input, len);
+		__builtin_memcpy((uint8_t *)(state->mem32) + state->memsize, input, len);
 		state->memsize += (uint32_t)len;
 		return 0;
 	}
@@ -287,7 +538,7 @@ int xxh32_update(struct xxh32_state *state, const void *input, const size_t len)
 	if (state->memsize) { /* some data left from previous update */
 		const uint32_t *p32 = state->mem32;

-		memcpy((uint8_t *)(state->mem32) + state->memsize, input,
+		__builtin_memcpy((uint8_t *)(state->mem32) + state->memsize, input,
 			16 - state->memsize);

 		state->v1 = xxh32_round(state->v1, get_unaligned_le32(p32));
@@ -328,15 +579,14 @@ int xxh32_update(struct xxh32_state *state, const void *input, const size_t len)
 	}

 	if (p < b_end) {
-		memcpy(state->mem32, p, (size_t)(b_end-p));
+		__builtin_memcpy(state->mem32, p, (size_t)(b_end-p));
 		state->memsize = (uint32_t)(b_end-p);
 	}

 	return 0;
 }
-EXPORT_SYMBOL(xxh32_update);

-uint32_t xxh32_digest(const struct xxh32_state *state)
+XXH_API uint32_t xxh32_digest(const struct xxh32_state *state)
 {
 	const uint8_t *p = (const uint8_t *)state->mem32;
 	const uint8_t *const b_end = (const uint8_t *)(state->mem32) +
@@ -372,9 +622,8 @@ uint32_t xxh32_digest(const struct xxh32_state *state)

 	return h32;
 }
-EXPORT_SYMBOL(xxh32_digest);

-int xxh64_update(struct xxh64_state *state, const void *input, const size_t len)
+XXH_API int xxh64_update(struct xxh64_state *state, const void *input, const size_t len)
 {
 	const uint8_t *p = (const uint8_t *)input;
 	const uint8_t *const b_end = p + len;
@@ -385,7 +634,7 @@ int xxh64_update(struct xxh64_state *state, const void *input, const size_t len)
 	state->total_len += len;

 	if (state->memsize + len < 32) { /* fill in tmp buffer */
-		memcpy(((uint8_t *)state->mem64) + state->memsize, input, len);
+		__builtin_memcpy(((uint8_t *)state->mem64) + state->memsize, input, len);
 		state->memsize += (uint32_t)len;
 		return 0;
 	}
@@ -393,7 +642,7 @@ int xxh64_update(struct xxh64_state *state, const void *input, const size_t len)
 	if (state->memsize) { /* tmp buffer is full */
 		uint64_t *p64 = state->mem64;

-		memcpy(((uint8_t *)p64) + state->memsize, input,
+		__builtin_memcpy(((uint8_t *)p64) + state->memsize, input,
 			32 - state->memsize);

 		state->v1 = xxh64_round(state->v1, get_unaligned_le64(p64));
@@ -433,15 +682,14 @@ int xxh64_update(struct xxh64_state *state, const void *input, const size_t len)
 	}

 	if (p < b_end) {
-		memcpy(state->mem64, p, (size_t)(b_end-p));
+		__builtin_memcpy(state->mem64, p, (size_t)(b_end-p));
 		state->memsize = (uint32_t)(b_end - p);
 	}

 	return 0;
 }
-EXPORT_SYMBOL(xxh64_update);

-uint64_t xxh64_digest(const struct xxh64_state *state)
+XXH_API uint64_t xxh64_digest(const struct xxh64_state *state)
 {
 	const uint8_t *p = (const uint8_t *)state->mem64;
 	const uint8_t *const b_end = (const uint8_t *)state->mem64 +
@@ -494,7 +742,5 @@ uint64_t xxh64_digest(const struct xxh64_state *state)

 	return h64;
 }
-EXPORT_SYMBOL(xxh64_digest);

-MODULE_LICENSE("Dual BSD/GPL");
-MODULE_DESCRIPTION("xxHash");
+#endif /* XXHASH_H */
@@ -0,0 +1,44 @@
+#!/usr/bin/env sh
+
+set -e
+
+SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd)
+INCLUDE_DIR="$SCRIPT_DIR/../linux/include"
+LIB_DIR="$SCRIPT_DIR/../linux/lib"
+
+
+print() {
+    printf '%b' "${*}"
+}
+
+println() {
+    printf '%b\n' "${*}"
+}
+
+die() {
+    println "$@" 1>&2
+    exit 1
+}
+
+test_not_present() {
+    print "Testing that '$1' is not present... "
+    grep -r $1 "$INCLUDE_DIR" "$LIB_DIR" && die "Fail!"
+    println "Okay"
+}
+
+println "This test checks that the macro removal process worked as expected"
+println "If this test fails, then freestanding.py wasn't able to remove one of these"
+println "macros from the source code completely. You'll either need to rewrite the check"
+println "or improve freestanding.py."
+println ""
+
+test_not_present "ZSTD_NO_INTRINSICS"
+test_not_present "ZSTD_NO_UNUSED_FUNCTIONS"
+test_not_present "ZSTD_LEGACY_SUPPORT"
+test_not_present "STATIC_BMI2"
+test_not_present "ZSTD_NO_INLINE"
+test_not_present "ZSTD_DLL_EXPORT"
+test_not_present "ZSTD_DLL_IMPORT"
+test_not_present "__ICCARM__"
+test_not_present "_MSC_VER"
+test_not_present "_WIN32"
@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "decompress_sources.h"
+#include <linux/zstd.h>
+
+#define CONTROL(x)                                                             \
+  do {                                                                         \
+    if (!(x)) {                                                                \
+      fprintf(stderr, "%s:%u: %s failed!\n", __FUNCTION__, __LINE__, #x);      \
+      abort();                                                                 \
+    }                                                                          \
+  } while (0)
+
+
+static const char kEmptyZstdFrame[] = {
+    0x28, 0xb5, 0x2f, 0xfd, 0x24, 0x00, 0x01, 0x00, 0x00, 0x99, 0xe9, 0xd8, 0x51
+};
+
+static void test_decompress_unzstd() {
+    fprintf(stderr, "Testing decompress unzstd... ");
+    {
+        size_t const wkspSize = zstd_dctx_workspace_bound();
+        void* wksp = malloc(wkspSize);
+        CONTROL(wksp != NULL);
+        ZSTD_DCtx* dctx = zstd_init_dctx(wksp, wkspSize);
+        CONTROL(dctx != NULL);
+        size_t const dSize = zstd_decompress_dctx(dctx, NULL, 0, kEmptyZstdFrame, sizeof(kEmptyZstdFrame));
+        CONTROL(!zstd_is_error(dSize));
+        CONTROL(dSize == 0);
+        free(wksp);
+    }
+    fprintf(stderr, "Ok\n");
+}
+
+int main(void) {
+  test_decompress_unzstd();
+  return 0;
+}
@@ -0,0 +1,210 @@
+/*
+ * Copyright (c) 7-2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <linux/zstd.h>
+
+#define CONTROL(x)                                                             \
+  do {                                                                         \
+    if (!(x)) {                                                                \
+      fprintf(stderr, "%s:%u: %s failed!\n", __FUNCTION__, __LINE__, #x);      \
+      abort();                                                                 \
+    }                                                                          \
+  } while (0)
+
+typedef struct {
+  char *data;
+  char *data2;
+  size_t dataSize;
+  char *comp;
+  size_t compSize;
+} test_data_t;
+
+test_data_t create_test_data(void) {
+  test_data_t data;
+  data.dataSize = 128 * 1024;
+  data.data = malloc(data.dataSize);
+  CONTROL(data.data != NULL);
+  data.data2 = malloc(data.dataSize);
+  CONTROL(data.data2 != NULL);
+  data.compSize = zstd_compress_bound(data.dataSize);
+  data.comp = malloc(data.compSize);
+  CONTROL(data.comp != NULL);
+  memset(data.data, 0, data.dataSize);
+  return data;
+}
+
+static void free_test_data(test_data_t const *data) {
+  free(data->data);
+  free(data->data2);
+  free(data->comp);
+}
+
+#define MIN(a, b) ((a) < (b) ? (a) : (b))
+#define MAX(a, b) ((a) > (b) ? (a) : (b))
+
+static void test_btrfs(test_data_t const *data) {
+  fprintf(stderr, "testing btrfs use cases... ");
+  size_t const size = MIN(data->dataSize, 128 * 1024);
+  for (int level = -1; level < 16; ++level) {
+    struct zstd_parameters params = zstd_get_params(level, size);
+    CONTROL(params.cparams.window_log <= 17);
+    size_t const workspaceSize =
+        MAX(zstd_cstream_workspace_bound(&params.cparams),
+            zstd_dstream_workspace_bound(size));
+    void *workspace = malloc(workspaceSize);
+    CONTROL(workspace != NULL);
+
+    char const *ip = data->data;
+    char const *iend = ip + size;
+    char *op = data->comp;
+    char *oend = op + data->compSize;
+    {
+      zstd_cstream *cctx = zstd_init_cstream(&params, size, workspace, workspaceSize);
+      CONTROL(cctx != NULL);
+      struct zstd_out_buffer out = {NULL, 0, 0};
+      struct zstd_in_buffer in = {NULL, 0, 0};
+      for (;;) {
+        if (in.pos == in.size) {
+          in.src = ip;
+          in.size = MIN(4096, iend - ip);
+          in.pos = 0;
+          ip += in.size;
+        }
+
+        if (out.pos == out.size) {
+          out.dst = op;
+          out.size = MIN(4096, oend - op);
+          out.pos = 0;
+          op += out.size;
+        }
+
+        if (ip != iend || in.pos < in.size) {
+          CONTROL(!zstd_is_error(zstd_compress_stream(cctx, &out, &in)));
+        } else {
+          size_t const ret = zstd_end_stream(cctx, &out);
+          CONTROL(!zstd_is_error(ret));
+          if (ret == 0) {
+            break;
+          }
+        }
+      }
+      op += out.pos;
+    }
+
+    ip = data->comp;
+    iend = op;
+    op = data->data2;
+    oend = op + size;
+    {
+      zstd_dstream *dctx = zstd_init_dstream(1ULL << params.cparams.window_log, workspace, workspaceSize);
+      CONTROL(dctx != NULL);
+      struct zstd_out_buffer out = {NULL, 0, 0};
+      struct zstd_in_buffer in = {NULL, 0, 0};
+      for (;;) {
+        if (in.pos == in.size) {
+          in.src = ip;
+          in.size = MIN(4096, iend - ip);
+          in.pos = 0;
+          ip += in.size;
+        }
+
+        if (out.pos == out.size) {
+          out.dst = op;
+          out.size = MIN(4096, oend - op);
+          out.pos = 0;
+          op += out.size;
+        }
+
+        size_t const ret = zstd_decompress_stream(dctx, &out, &in);
+        CONTROL(!zstd_is_error(ret));
+        if (ret == 0) {
+          break;
+        }
+      }
+    }
+    CONTROL(op - data->data2 == data->dataSize);
+    CONTROL(!memcmp(data->data, data->data2, data->dataSize));
+    free(workspace);
+  }
+  fprintf(stderr, "Ok\n");
+}
+
+static void test_decompress_unzstd(test_data_t const *data) {
+    fprintf(stderr, "Testing decompress unzstd... ");
+    size_t cSize;
+    {
+        struct zstd_parameters params = zstd_get_params(19, 0);
+        size_t const wkspSize = zstd_cctx_workspace_bound(&params.cparams);
+        void* wksp = malloc(wkspSize);
+        CONTROL(wksp != NULL);
+        zstd_cctx* cctx = zstd_init_cctx(wksp, wkspSize);
+        CONTROL(cctx != NULL);
+        cSize = zstd_compress_cctx(cctx, data->comp, data->compSize, data->data, data->dataSize, &params);
+        CONTROL(!zstd_is_error(cSize));
+        free(wksp);
+    }
+    {
+        size_t const wkspSize = zstd_dctx_workspace_bound();
+        void* wksp = malloc(wkspSize);
+        CONTROL(wksp != NULL);
+        zstd_dctx* dctx = zstd_init_dctx(wksp, wkspSize);
+        CONTROL(dctx != NULL);
+        size_t const dSize = zstd_decompress_dctx(dctx, data->data2, data->dataSize, data->comp, cSize);
+        CONTROL(!zstd_is_error(dSize));
+        CONTROL(dSize == data->dataSize);
+        CONTROL(!memcmp(data->data, data->data2, data->dataSize));
+        free(wksp);
+    }
+    fprintf(stderr, "Ok\n");
+}
+
+static char *g_stack = NULL;
+
+static void __attribute__((noinline)) use(void *x) {
+  asm volatile("" : "+r"(x));
+}
+
+static void __attribute__((noinline)) set_stack() {
+
+  char stack[8192];
+  g_stack = stack;
+  memset(g_stack, 0x33, 8192);
+  use(g_stack);
+}
+
+static void __attribute__((noinline)) check_stack() {
+  size_t cleanStack = 0;
+  while (cleanStack < 8192 && g_stack[cleanStack] == 0x33) {
+    ++cleanStack;
+  }
+  size_t const stackSize = 8192 - cleanStack;
+  fprintf(stderr, "Maximum stack size: %zu\n", stackSize);
+  CONTROL(stackSize <= 2048 + 512);
+}
+
+static void test_stack_usage(test_data_t const *data) {
+  set_stack();
+  test_btrfs(data);
+  test_decompress_unzstd(data);
+  check_stack();
+}
+
+int main(void) {
+  test_data_t data = create_test_data();
+  test_btrfs(&data);
+  test_decompress_unzstd(&data);
+  test_stack_usage(&data);
+  free_test_data(&data);
+  return 0;
+}
@@ -1,185 +0,0 @@
-/*
- * Copyright (c) 2016-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under both the BSD-style license (found in the
- * LICENSE file in the root directory of this source tree) and the GPLv2 (found
- * in the COPYING file in the root directory of this source tree).
- */
-
-/* DO_XXH should be 32 or 64 for xxh32 and xxh64 respectively */
-#define DO_XXH 0
-/* DO_CRC should be 0 or 1 */
-#define DO_CRC 0
-/* Buffer size */
-#define BUFFER_SIZE 4096
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/fs.h>
-#include <linux/uaccess.h>
-
-#if DO_XXH
-#include <linux/xxhash.h>
-#endif
-
-#if DO_CRC
-#include <linux/crc32.h>
-#endif
-
-/* Device name to pass to register_chrdev(). */
-#define DEVICE_NAME "xxhash_test"
-
-/* Dynamically allocated device major number */
-static int device_major;
-
-/*
- * We reuse the same hash state, and thus can hash only one
- * file at a time.
- */
-static bool device_is_open;
-
-static uint64_t total_length;
-
-
-#if (DO_XXH == 32)
-
-#define xxh_state xxh32_state
-#define xxh_reset xxh32_reset
-#define xxh_update xxh32_update
-#define xxh_digest xxh32_digest
-#define XXH_FORMAT "XXH32 = 0x%x"
-
-#elif (DO_XXH == 64)
-
-#define xxh_state xxh64_state
-#define xxh_reset xxh64_reset
-#define xxh_update xxh64_update
-#define xxh_digest xxh64_digest
-#define XXH_FORMAT "XXH64 = 0x%llx"
-
-#elif DO_XXH
-
-#error "Invalid value of DO_XXH"
-
-#endif
-
-#if DO_XXH
-
-/* XXH state */
-static struct xxh_state state;
-
-#endif /* DO_XXH */
-
-#if DO_CRC
-
-static uint32_t crc;
-
-#endif /* DO_CRC */
-
-/*
- * Input buffer used to put data coming from userspace.
- */
-static uint8_t buffer_in[BUFFER_SIZE];
-
-static int xxhash_test_open(struct inode *i, struct file *f)
-{
-	if (device_is_open)
-		return -EBUSY;
-
-	device_is_open = true;
-
-	total_length = 0;
-#if DO_XXH
-	xxh_reset(&state, 0);
-#endif
-#if DO_CRC
-	crc = 0xFFFFFFFF;
-#endif
-
-	printk(KERN_INFO DEVICE_NAME ": opened\n");
-	return 0;
-}
-
-static int xxhash_test_release(struct inode *i, struct file *f)
-{
-	device_is_open = false;
-
-	printk(KERN_INFO DEVICE_NAME ": total_len = %llu\n", total_length);
-#if DO_XXH
-	printk(KERN_INFO DEVICE_NAME ": " XXH_FORMAT "\n", xxh_digest(&state));
-#endif
-#if DO_CRC
-	printk(KERN_INFO DEVICE_NAME ": CRC32 = 0x%08x\n", ~crc);
-#endif
-	printk(KERN_INFO DEVICE_NAME ": closed\n");
-	return 0;
-}
-
-/*
- * Hash the data given to us from userspace.
- */
-static ssize_t xxhash_test_write(struct file *file, const char __user *buf,
-				 size_t size, loff_t *pos)
-{
-	size_t remaining = size;
-
-	while (remaining > 0) {
-#if DO_XXH
-		int ret;
-#endif
-		size_t const copy_size = min(remaining, sizeof(buffer_in));
-
-		if (copy_from_user(buffer_in, buf, copy_size))
-			return -EFAULT;
-		buf += copy_size;
-		remaining -= copy_size;
-		total_length += copy_size;
-#if DO_XXH
-		if ((ret = xxh_update(&state, buffer_in, copy_size))) {
-			printk(KERN_INFO DEVICE_NAME ": xxh failure.");
-			return ret;
-		}
-#endif
-#if DO_CRC
-		crc = crc32(crc, buffer_in, copy_size);
-#endif
-	}
-	return size;
-}
-/* register the character device. */
-static int __init xxhash_test_init(void)
-{
-	static const struct file_operations fileops = {
-		.owner = THIS_MODULE,
-		.open = &xxhash_test_open,
-		.release = &xxhash_test_release,
-		.write = &xxhash_test_write
-	};
-
-	device_major = register_chrdev(0, DEVICE_NAME, &fileops);
-	if (device_major < 0) {
-		return device_major;
-	}
-
-	printk(KERN_INFO DEVICE_NAME ": module loaded\n");
-	printk(KERN_INFO DEVICE_NAME ": Create a device node with "
-			"'mknod " DEVICE_NAME " c %d 0' and write data "
-			"to it.\n", device_major);
-	return 0;
-}
-
-static void __exit xxhash_test_exit(void)
-{
-	unregister_chrdev(device_major, DEVICE_NAME);
-	printk(KERN_INFO DEVICE_NAME ": module unloaded\n");
-}
-
-module_init(xxhash_test_init);
-module_exit(xxhash_test_exit);
-
-MODULE_DESCRIPTION("XXHash tester");
-MODULE_VERSION("1.0");
-
-
-MODULE_LICENSE("Dual BSD/GPL");
@@ -0,0 +1,206 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/zstd.h>
+
+#include "zstd.h"
+#include "common/zstd_deps.h"
+#include "common/zstd_internal.h"
+
+static void zstd_check_structs(void) {
+	/* Check that the structs have the same size. */
+	ZSTD_STATIC_ASSERT(sizeof(ZSTD_parameters) ==
+		sizeof(struct zstd_parameters));
+	ZSTD_STATIC_ASSERT(sizeof(ZSTD_compressionParameters) ==
+		sizeof(struct zstd_compression_parameters));
+	ZSTD_STATIC_ASSERT(sizeof(ZSTD_frameParameters) ==
+		sizeof(struct zstd_frame_parameters));
+	/* Zstd guarantees that the layout of the structs never change. Verify it. */
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_parameters, cParams) ==
+		offsetof(struct zstd_parameters, cparams));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_parameters, fParams) ==
+		offsetof(struct zstd_parameters, fparams));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_compressionParameters, windowLog) ==
+		offsetof(struct zstd_compression_parameters, window_log));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_compressionParameters, chainLog) ==
+		offsetof(struct zstd_compression_parameters, chain_log));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_compressionParameters, hashLog) ==
+		offsetof(struct zstd_compression_parameters, hash_log));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_compressionParameters, searchLog) ==
+		offsetof(struct zstd_compression_parameters, search_log));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_compressionParameters, minMatch) ==
+		offsetof(struct zstd_compression_parameters, search_length));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_compressionParameters, targetLength) ==
+		offsetof(struct zstd_compression_parameters, target_length));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_compressionParameters, strategy) ==
+		offsetof(struct zstd_compression_parameters, strategy));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_frameParameters, contentSizeFlag) ==
+		offsetof(struct zstd_frame_parameters, content_size_flag));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_frameParameters, checksumFlag) ==
+		offsetof(struct zstd_frame_parameters, checksum_flag));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_frameParameters, noDictIDFlag) ==
+		offsetof(struct zstd_frame_parameters, no_dict_id_flag));
+	/* Check that the strategies are the same. This can change. */
+	ZSTD_STATIC_ASSERT((int)ZSTD_fast == (int)zstd_fast);
+	ZSTD_STATIC_ASSERT((int)ZSTD_dfast == (int)zstd_dfast);
+	ZSTD_STATIC_ASSERT((int)ZSTD_greedy == (int)zstd_greedy);
+	ZSTD_STATIC_ASSERT((int)ZSTD_lazy == (int)zstd_lazy);
+	ZSTD_STATIC_ASSERT((int)ZSTD_lazy2 == (int)zstd_lazy2);
+	ZSTD_STATIC_ASSERT((int)ZSTD_btlazy2 == (int)zstd_btlazy2);
+	ZSTD_STATIC_ASSERT((int)ZSTD_btopt == (int)zstd_btopt);
+	ZSTD_STATIC_ASSERT((int)ZSTD_btultra == (int)zstd_btultra);
+	ZSTD_STATIC_ASSERT((int)ZSTD_btultra2 == (int)zstd_btultra2);
+	/* Check input buffer */
+	ZSTD_STATIC_ASSERT(sizeof(ZSTD_inBuffer) == sizeof(struct zstd_in_buffer));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_inBuffer, src) ==
+		offsetof(struct zstd_in_buffer, src));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_inBuffer, size) ==
+		offsetof(struct zstd_in_buffer, size));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_inBuffer, pos) ==
+		offsetof(struct zstd_in_buffer, pos));
+	/* Check output buffer */
+	ZSTD_STATIC_ASSERT(sizeof(ZSTD_outBuffer) ==
+		sizeof(struct zstd_out_buffer));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_outBuffer, dst) ==
+		offsetof(struct zstd_out_buffer, dst));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_outBuffer, size) ==
+		offsetof(struct zstd_out_buffer, size));
+	ZSTD_STATIC_ASSERT(offsetof(ZSTD_outBuffer, pos) ==
+		offsetof(struct zstd_out_buffer, pos));
+}
+
+size_t zstd_compress_bound(size_t src_size)
+{
+	return ZSTD_compressBound(src_size);
+}
+EXPORT_SYMBOL(zstd_compress_bound);
+
+struct zstd_parameters zstd_get_params(int level,
+	unsigned long long estimated_src_size)
+{
+	const ZSTD_parameters params = ZSTD_getParams(level, estimated_src_size, 0);
+	struct zstd_parameters out;
+
+	/* no-op */
+	zstd_check_structs();
+	ZSTD_memcpy(&out, &params, sizeof(out));
+	return out;
+}
+EXPORT_SYMBOL(zstd_get_params);
+
+size_t zstd_cctx_workspace_bound(
+	const struct zstd_compression_parameters *cparams)
+{
+	ZSTD_compressionParameters p;
+
+	ZSTD_memcpy(&p, cparams, sizeof(p));
+	return ZSTD_estimateCCtxSize_usingCParams(p);
+}
+EXPORT_SYMBOL(zstd_cctx_workspace_bound);
+
+zstd_cctx *zstd_init_cctx(void *workspace, size_t workspace_size)
+{
+	if (workspace == NULL)
+		return NULL;
+	return ZSTD_initStaticCCtx(workspace, workspace_size);
+}
+EXPORT_SYMBOL(zstd_init_cctx);
+
+size_t zstd_compress_cctx(zstd_cctx *cctx, void *dst, size_t dst_capacity,
+	const void *src, size_t src_size, const struct zstd_parameters *parameters)
+{
+	ZSTD_parameters p;
+
+	ZSTD_memcpy(&p, parameters, sizeof(p));
+	return ZSTD_compress_advanced(cctx, dst, dst_capacity, src, src_size, NULL, 0, p);
+}
+EXPORT_SYMBOL(zstd_compress_cctx);
+
+size_t zstd_cstream_workspace_bound(
+	const struct zstd_compression_parameters *cparams)
+{
+	ZSTD_compressionParameters p;
+
+	ZSTD_memcpy(&p, cparams, sizeof(p));
+	return ZSTD_estimateCStreamSize_usingCParams(p);
+}
+EXPORT_SYMBOL(zstd_cstream_workspace_bound);
+
+zstd_cstream *zstd_init_cstream(const struct zstd_parameters *parameters,
+	unsigned long long pledged_src_size, void *workspace, size_t workspace_size)
+{
+	ZSTD_parameters p;
+	zstd_cstream *cstream;
+	size_t ret;
+
+	if (workspace == NULL)
+		return NULL;
+
+	cstream = ZSTD_initStaticCStream(workspace, workspace_size);
+	if (cstream == NULL)
+		return NULL;
+
+	/* 0 means unknown in linux zstd API but means 0 in new zstd API */
+	if (pledged_src_size == 0)
+		pledged_src_size = ZSTD_CONTENTSIZE_UNKNOWN;
+
+	ZSTD_memcpy(&p, parameters, sizeof(p));
+	ret = ZSTD_initCStream_advanced(cstream, NULL, 0, p, pledged_src_size);
+	if (ZSTD_isError(ret))
+		return NULL;
+
+	return cstream;
+}
+EXPORT_SYMBOL(zstd_init_cstream);
+
+size_t zstd_reset_cstream(zstd_cstream *cstream,
+	unsigned long long pledged_src_size)
+{
+	return ZSTD_resetCStream(cstream, pledged_src_size);
+}
+EXPORT_SYMBOL(zstd_reset_cstream);
+
+size_t zstd_compress_stream(zstd_cstream *cstream,
+	struct zstd_out_buffer *output, struct zstd_in_buffer *input)
+{
+	ZSTD_outBuffer o;
+	ZSTD_inBuffer i;
+	size_t ret;
+
+	ZSTD_memcpy(&o, output, sizeof(o));
+	ZSTD_memcpy(&i, input, sizeof(i));
+	ret = ZSTD_compressStream(cstream, &o, &i);
+	ZSTD_memcpy(output, &o, sizeof(o));
+	ZSTD_memcpy(input, &i, sizeof(i));
+	return ret;
+}
+EXPORT_SYMBOL(zstd_compress_stream);
+
+size_t zstd_flush_stream(zstd_cstream *cstream, struct zstd_out_buffer *output)
+{
+	ZSTD_outBuffer o;
+	size_t ret;
+
+	ZSTD_memcpy(&o, output, sizeof(o));
+	ret = ZSTD_flushStream(cstream, &o);
+	ZSTD_memcpy(output, &o, sizeof(o));
+	return ret;
+}
+EXPORT_SYMBOL(zstd_flush_stream);
+
+size_t zstd_end_stream(zstd_cstream *cstream, struct zstd_out_buffer *output)
+{
+	ZSTD_outBuffer o;
+	size_t ret;
+
+	ZSTD_memcpy(&o, output, sizeof(o));
+	ret = ZSTD_endStream(cstream, &o);
+	ZSTD_memcpy(output, &o, sizeof(o));
+	return ret;
+}
+EXPORT_SYMBOL(zstd_end_stream);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("Zstd Compressor");
@@ -1,279 +0,0 @@
-/*
- * Copyright (c) 2016-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under both the BSD-style license (found in the
- * LICENSE file in the root directory of this source tree) and the GPLv2 (found
- * in the COPYING file in the root directory of this source tree).
- */
-
-/* Compression level or 0 to disable */
-#define DO_ZLIB 9
-/* Compression level or 0 to disable */
-#define DO_ZSTD 0
-/* Buffer size */
-#define BUFFER_SIZE 4096
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/vmalloc.h>
-#include <linux/fs.h>
-#include <linux/uaccess.h>
-
-#if DO_ZSTD
-#include <linux/zstd.h>
-#endif
-
-#if DO_ZLIB
-#include <linux/zlib.h>
-#endif
-
-/* Device name to pass to register_chrdev(). */
-#define DEVICE_NAME "zstd_compress_test"
-
-/* Dynamically allocated device major number */
-static int device_major;
-
-/*
- * We reuse the same state, and thus can compress only one file at a time.
- */
-static bool device_is_open;
-
-
-static void *workspace = NULL;
-
-/*
- * Input buffer used to put data coming from userspace.
- */
-static uint8_t buffer_in[BUFFER_SIZE];
-static uint8_t buffer_out[BUFFER_SIZE];
-
-static uint64_t uncompressed_len;
-static uint64_t compressed_len;
-
-#if DO_ZSTD
-
-static ZSTD_CStream *state;
-
-static ZSTD_inBuffer input = {
-	.src = buffer_in,
-	.size = sizeof(buffer_in),
-	.pos = sizeof(buffer_in),
-};
-
-static ZSTD_outBuffer output = {
-	.dst = buffer_out,
-	.size = sizeof(buffer_out),
-	.pos = sizeof(buffer_out),
-};
-
-#endif /* DO_ZSTD */
-
-#if DO_ZLIB
-
-static z_stream state = {
-	.next_in = buffer_in,
-	.avail_in = 0,
-	.total_in = 0,
-
-	.next_out = buffer_out,
-	.avail_out = sizeof(buffer_out),
-	.total_out = 0,
-
-	.msg = NULL,
-	.state = NULL,
-	.workspace = NULL,
-};
-
-#endif /* DO_ZLIB */
-
-static int zstd_compress_test_open(struct inode *i, struct file *f)
-{
-	if (device_is_open)
-		return -EBUSY;
-
-	device_is_open = true;
-
-	uncompressed_len = compressed_len = 0;
-
-#if DO_ZSTD
-	if (ZSTD_isError(ZSTD_resetCStream(state, 0)))
-		return -EIO;
-#endif
-
-#if DO_ZLIB
-	if (zlib_deflateReset(&state) != Z_OK)
-		return -EIO;
-#endif
-
-	printk(KERN_INFO DEVICE_NAME ": opened\n");
-	return 0;
-}
-
-static int zstd_compress_test_release(struct inode *i, struct file *f)
-{
-	device_is_open = false;
-
-#if DO_ZSTD
-	do {
-		size_t ret;
-
-		output.pos = 0;
-		ret = ZSTD_endStream(state, &output);
-		if (ZSTD_isError(ret)) {
-			printk(KERN_INFO DEVICE_NAME ": zstd end error %u\n", ZSTD_getErrorCode(ret));
-			return -EIO;
-		}
-		compressed_len += output.pos;
-	} while (output.pos != output.size);
-#endif
-
-#if DO_ZLIB
-	for (;;) {
-		int ret;
-
-		state.next_out = buffer_out;
-		state.avail_out = sizeof(buffer_out);
-		ret = zlib_deflate(&state, Z_FINISH);
-		compressed_len += sizeof(buffer_out) - state.avail_out;
-		if (ret == Z_STREAM_END)
-			break;
-		if (ret != Z_OK) {
-			printk(KERN_INFO DEVICE_NAME ": zlib end error %d: %s\n", ret, state.msg);
-			return -EIO;
-		}
-	}
-#endif
-
-	printk(KERN_INFO DEVICE_NAME ": uncompressed_len = %llu\n", uncompressed_len);
-	printk(KERN_INFO DEVICE_NAME ": compressed_len   = %llu\n", compressed_len);
-	printk(KERN_INFO DEVICE_NAME ": closed\n");
-	return 0;
-}
-
-/*
- * Hash the data given to us from userspace.
- */
-static ssize_t zstd_compress_test_write(struct file *file,
-				 const char __user *buf, size_t size, loff_t *pos)
-{
-	size_t remaining = size;
-
-	while (remaining > 0) {
-		size_t const copy_size = min(remaining, sizeof(buffer_in));
-
-		if (copy_from_user(buffer_in, buf, copy_size))
-			return -EFAULT;
-		buf += copy_size;
-		remaining -= copy_size;
-		uncompressed_len += copy_size;
-
-#if DO_ZSTD
-		input.pos = 0;
-		input.size = copy_size;
-		while (input.pos != input.size) {
-			size_t ret;
-
-			output.pos = 0;
-			ret = ZSTD_compressStream(state, &output, &input);
-			if (ZSTD_isError(ret)) {
-				printk(KERN_INFO DEVICE_NAME ": zstd compress error %u\n", ZSTD_getErrorCode(ret));
-				return -EIO;
-			}
-			compressed_len += output.pos;
-		}
-#endif
-#if DO_ZLIB
-		state.next_in = buffer_in;
-		state.avail_in = copy_size;
-		while (state.avail_in > 0) {
-			int ret;
-
-			state.next_out = buffer_out;
-			state.avail_out = sizeof(buffer_out);
-			ret = zlib_deflate(&state, Z_NO_FLUSH);
-			compressed_len += sizeof(buffer_out) - state.avail_out;
-			if (ret != Z_OK) {
-				printk(KERN_INFO DEVICE_NAME ": zlib end error %d: %s\n", ret, state.msg);
-				return -EIO;
-			}
-		}
-#endif
-	}
-	return size;
-}
-/* register the character device. */
-static int __init zstd_compress_test_init(void)
-{
-	static const struct file_operations fileops = {
-		.owner = THIS_MODULE,
-		.open = &zstd_compress_test_open,
-		.release = &zstd_compress_test_release,
-		.write = &zstd_compress_test_write
-	};
-	size_t workspace_size = 0;
-#if DO_ZSTD
-	ZSTD_parameters params;
-#endif
-
-	device_major = register_chrdev(0, DEVICE_NAME, &fileops);
-	if (device_major < 0) {
-		return device_major;
-	}
-
-#if DO_ZSTD
-	params = ZSTD_getParams(DO_ZSTD, 0, 0);
-	workspace_size = ZSTD_CStreamWorkspaceBound(params.cParams);
-
-	if (!(workspace = vmalloc(workspace_size)))
-		goto fail;
-	if (!(state = ZSTD_initCStream(params, 0, workspace, workspace_size)))
-		goto fail;
-#endif
-
-#if DO_ZLIB
-	workspace_size = zlib_deflate_workspacesize(MAX_WBITS, MAX_MEM_LEVEL);
-
-	if (!(workspace = vmalloc(workspace_size)))
-		goto fail;
-	state.workspace = workspace;
-	if (zlib_deflateInit(&state, DO_ZLIB) != Z_OK)
-		goto fail;
-#endif
-
-	printk(KERN_INFO DEVICE_NAME ": module loaded\n");
-	printk(KERN_INFO DEVICE_NAME ": compression requires %zu bytes of memory\n", workspace_size);
-	printk(KERN_INFO DEVICE_NAME ": Create a device node with "
-			"'mknod " DEVICE_NAME " c %d 0' and write data "
-			"to it.\n", device_major);
-	return 0;
-
-fail:
-	printk(KERN_INFO DEVICE_NAME ": failed to load module\n");
-	if (workspace) {
-		vfree(workspace);
-		workspace = NULL;
-	}
-	return -ENOMEM;
-}
-
-static void __exit zstd_compress_test_exit(void)
-{
-	unregister_chrdev(device_major, DEVICE_NAME);
-#if DO_ZLIB
-	zlib_deflateEnd(&state);
-#endif
-	if (workspace) {
-		vfree(workspace);
-		workspace = NULL;
-	}
-	printk(KERN_INFO DEVICE_NAME ": module unloaded\n");
-}
-
-module_init(zstd_compress_test_init);
-module_exit(zstd_compress_test_exit);
-
-MODULE_DESCRIPTION("Zstd compression tester");
-MODULE_VERSION("1.0");
-
-MODULE_LICENSE("Dual BSD/GPL");
@@ -0,0 +1,122 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/string.h>
+#include <linux/zstd.h>
+
+#include "zstd.h"
+#include "common/zstd_deps.h"
+#include "common/zstd_errors.h"
+
+/* Common symbols. zstd_compress must depend on zstd_decompress. */
+
+unsigned int zstd_is_error(size_t code)
+{
+	return ZSTD_isError(code);
+}
+EXPORT_SYMBOL(zstd_is_error);
+
+int zstd_get_error_code(size_t code)
+{
+	return ZSTD_getErrorCode(code);
+}
+EXPORT_SYMBOL(zstd_get_error_code);
+
+const char *zstd_get_error_name(size_t code)
+{
+	return ZSTD_getErrorName(code);
+}
+EXPORT_SYMBOL(zstd_get_error_name);
+
+/* Decompression symbols. */
+
+size_t zstd_dctx_workspace_bound(void)
+{
+	return ZSTD_estimateDCtxSize();
+}
+EXPORT_SYMBOL(zstd_dctx_workspace_bound);
+
+zstd_dctx *zstd_init_dctx(void *workspace, size_t workspace_size)
+{
+	if (workspace == NULL)
+		return NULL;
+	return ZSTD_initStaticDCtx(workspace, workspace_size);
+}
+EXPORT_SYMBOL(zstd_init_dctx);
+
+size_t zstd_decompress_dctx(zstd_dctx *dctx, void *dst, size_t dst_capacity,
+	const void *src, size_t src_size)
+{
+	return ZSTD_decompressDCtx(dctx, dst, dst_capacity, src, src_size);
+}
+EXPORT_SYMBOL(zstd_decompress_dctx);
+
+size_t zstd_dstream_workspace_bound(size_t max_window_size)
+{
+	return ZSTD_estimateDStreamSize(max_window_size);
+}
+EXPORT_SYMBOL(zstd_dstream_workspace_bound);
+
+zstd_dstream *zstd_init_dstream(size_t max_window_size, void *workspace,
+	size_t workspace_size)
+{
+	if (workspace == NULL)
+		return NULL;
+	(void)max_window_size;
+	return ZSTD_initStaticDStream(workspace, workspace_size);
+}
+EXPORT_SYMBOL(zstd_init_dstream);
+
+size_t zstd_reset_dstream(zstd_dstream *dstream)
+{
+	return ZSTD_resetDStream(dstream);
+}
+EXPORT_SYMBOL(zstd_reset_dstream);
+
+size_t zstd_decompress_stream(zstd_dstream *dstream,
+	struct zstd_out_buffer *output, struct zstd_in_buffer *input)
+{
+	ZSTD_outBuffer o;
+	ZSTD_inBuffer i;
+	size_t ret;
+
+	ZSTD_memcpy(&o, output, sizeof(o));
+	ZSTD_memcpy(&i, input, sizeof(i));
+	ret = ZSTD_decompressStream(dstream, &o, &i);
+	ZSTD_memcpy(output, &o, sizeof(o));
+	ZSTD_memcpy(input, &i, sizeof(i));
+	return ret;
+}
+EXPORT_SYMBOL(zstd_decompress_stream);
+
+size_t zstd_find_frame_compressed_size(const void *src, size_t src_size)
+{
+	return ZSTD_findFrameCompressedSize(src, src_size);
+}
+EXPORT_SYMBOL(zstd_find_frame_compressed_size);
+
+size_t zstd_get_frame_params(struct zstd_frame_params *params, const void *src,
+	size_t src_size)
+{
+	ZSTD_frameHeader h;
+	const size_t ret = ZSTD_getFrameHeader(&h, src, src_size);
+
+	if (ret != 0)
+		return ret;
+
+	if (h.frameContentSize != ZSTD_CONTENTSIZE_UNKNOWN)
+		params->frame_content_size = h.frameContentSize;
+	else
+		params->frame_content_size = 0;
+
+	params->window_size = h.windowSize;
+	params->dict_id = h.dictID;
+	params->checksum_flag = h.checksumFlag;
+
+	return ret;
+}
+EXPORT_SYMBOL(zstd_get_frame_params);
+
+MODULE_LICENSE("Dual BSD/GPL");
+MODULE_DESCRIPTION("Zstd Decompressor");
@@ -1,250 +0,0 @@
-/*
- * Copyright (c) 2016-present, Facebook, Inc.
- * All rights reserved.
- *
- * This source code is licensed under both the BSD-style license (found in the
- * LICENSE file in the root directory of this source tree) and the GPLv2 (found
- * in the COPYING file in the root directory of this source tree).
- */
-
-/* Compression level or 0 to disable */
-#define DO_ZLIB 1
-/* Compression level or 0 to disable */
-#define DO_ZSTD 0
-/* Buffer size */
-#define BUFFER_SIZE 4096
-
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/vmalloc.h>
-#include <linux/fs.h>
-#include <linux/uaccess.h>
-
-#if DO_ZSTD
-#include <linux/zstd.h>
-#endif
-
-#if DO_ZLIB
-#include <linux/zlib.h>
-#endif
-
-/* Device name to pass to register_chrdev(). */
-#define DEVICE_NAME "zstd_decompress_test"
-
-/* Dynamically allocated device major number */
-static int device_major;
-
-/*
- * We reuse the same state, and thus can compress only one file at a time.
- */
-static bool device_is_open;
-
-
-static void *workspace = NULL;
-
-/*
- * Input buffer used to put data coming from userspace.
- */
-static uint8_t buffer_in[BUFFER_SIZE];
-static uint8_t buffer_out[BUFFER_SIZE];
-
-static uint64_t uncompressed_len;
-static uint64_t compressed_len;
-
-#if DO_ZSTD
-
-static ZSTD_DStream *state;
-
-static ZSTD_inBuffer input = {
-	.src = buffer_in,
-	.size = sizeof(buffer_in),
-	.pos = sizeof(buffer_in),
-};
-
-static ZSTD_outBuffer output = {
-	.dst = buffer_out,
-	.size = sizeof(buffer_out),
-	.pos = sizeof(buffer_out),
-};
-
-#endif /* DO_ZSTD */
-
-#if DO_ZLIB
-
-static z_stream state = {
-	.next_in = buffer_in,
-	.avail_in = 0,
-	.total_in = 0,
-
-	.next_out = buffer_out,
-	.avail_out = sizeof(buffer_out),
-	.total_out = 0,
-
-	.msg = NULL,
-	.state = NULL,
-	.workspace = NULL,
-};
-
-#endif /* DO_ZLIB */
-
-static int zstd_decompress_test_open(struct inode *i, struct file *f)
-{
-	if (device_is_open)
-		return -EBUSY;
-
-	device_is_open = true;
-
-	uncompressed_len = compressed_len = 0;
-
-#if DO_ZSTD
-	if (ZSTD_isError(ZSTD_resetDStream(state)))
-		return -EIO;
-#endif
-
-#if DO_ZLIB
-	if (zlib_inflateReset(&state) != Z_OK)
-		return -EIO;
-#endif
-
-	printk(KERN_INFO DEVICE_NAME ": opened\n");
-	return 0;
-}
-
-static int zstd_decompress_test_release(struct inode *i, struct file *f)
-{
-	device_is_open = false;
-
-	printk(KERN_INFO DEVICE_NAME ": uncompressed_len = %llu\n", uncompressed_len);
-	printk(KERN_INFO DEVICE_NAME ": compressed_len   = %llu\n", compressed_len);
-	printk(KERN_INFO DEVICE_NAME ": closed\n");
-	return 0;
-}
-
-/*
- * Hash the data given to us from userspace.
- */
-static ssize_t zstd_decompress_test_write(struct file *file,
-				 const char __user *buf, size_t size, loff_t *pos)
-{
-	size_t remaining = size;
-
-	while (remaining > 0) {
-		size_t const copy_size = min(remaining, sizeof(buffer_in));
-
-		if (copy_from_user(buffer_in, buf, copy_size))
-			return -EFAULT;
-		buf += copy_size;
-		remaining -= copy_size;
-		compressed_len += copy_size;
-
-#if DO_ZSTD
-		input.pos = 0;
-		input.size = copy_size;
-		while (input.pos != input.size) {
-			size_t ret;
-
-			output.pos = 0;
-			ret = ZSTD_decompressStream(state, &output, &input);
-			if (ZSTD_isError(ret)) {
-				printk(KERN_INFO DEVICE_NAME ": zstd decompress error %u\n", ZSTD_getErrorCode(ret));
-				return -EIO;
-			}
-			uncompressed_len += output.pos;
-		}
-#endif
-#if DO_ZLIB
-		state.next_in = buffer_in;
-		state.avail_in = copy_size;
-		while (state.avail_in > 0) {
-			int ret;
-
-			state.next_out = buffer_out;
-			state.avail_out = sizeof(buffer_out);
-			ret = zlib_inflate(&state, Z_NO_FLUSH);
-			uncompressed_len += sizeof(buffer_out) - state.avail_out;
-			if (ret != Z_OK && ret != Z_STREAM_END) {
-				printk(KERN_INFO DEVICE_NAME ": zlib decompress error %d: %s\n", ret, state.msg);
-				return -EIO;
-			}
-		}
-#endif
-	}
-	return size;
-}
-/* register the character device. */
-static int __init zstd_decompress_test_init(void)
-{
-	static const struct file_operations fileops = {
-		.owner = THIS_MODULE,
-		.open = &zstd_decompress_test_open,
-		.release = &zstd_decompress_test_release,
-		.write = &zstd_decompress_test_write
-	};
-	size_t workspace_size = 0;
-#if DO_ZSTD
-	ZSTD_parameters params;
-	size_t max_window_size;
-#endif
-
-	device_major = register_chrdev(0, DEVICE_NAME, &fileops);
-	if (device_major < 0) {
-		return device_major;
-	}
-
-#if DO_ZSTD
-	params = ZSTD_getParams(DO_ZSTD, 0, 0);
-	max_window_size = (size_t)1 << params.cParams.windowLog;
-	workspace_size = ZSTD_DStreamWorkspaceBound(max_window_size);
-
-	if (!(workspace = vmalloc(workspace_size)))
-		goto fail;
-	if (!(state = ZSTD_initDStream(max_window_size, workspace, workspace_size)))
-		goto fail;
-#endif
-
-#if DO_ZLIB
-	workspace_size = zlib_inflate_workspacesize();
-
-	if (!(workspace = vmalloc(workspace_size)))
-		goto fail;
-	state.workspace = workspace;
-	if (zlib_inflateInit(&state) != Z_OK)
-		goto fail;
-#endif
-
-	printk(KERN_INFO DEVICE_NAME ": module loaded\n");
-	printk(KERN_INFO DEVICE_NAME ": decompression requires %zu bytes of memory\n", workspace_size);
-	printk(KERN_INFO DEVICE_NAME ": Create a device node with "
-			"'mknod " DEVICE_NAME " c %d 0' and write data "
-			"to it.\n", device_major);
-	return 0;
-
-fail:
-	printk(KERN_INFO DEVICE_NAME ": failed to load module\n");
-	if (workspace) {
-		vfree(workspace);
-		workspace = NULL;
-	}
-	return -ENOMEM;
-}
-
-static void __exit zstd_decompress_test_exit(void)
-{
-	unregister_chrdev(device_major, DEVICE_NAME);
-#if DO_ZLIB
-	zlib_deflateEnd(&state);
-#endif
-	if (workspace) {
-		vfree(workspace);
-		workspace = NULL;
-	}
-	printk(KERN_INFO DEVICE_NAME ": module unloaded\n");
-}
-
-module_init(zstd_decompress_test_init);
-module_exit(zstd_decompress_test_exit);
-
-MODULE_DESCRIPTION("Zstd decompression tester");
-MODULE_VERSION("1.0");
-
-MODULE_LICENSE("Dual BSD/GPL");
@@ -0,0 +1,124 @@
+/*
+ * Copyright (c) 2016-2020, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+
+/*
+ * This file provides common libc dependencies that zstd requires.
+ * The purpose is to allow replacing this file with a custom implementation
+ * to compile zstd without libc support.
+ */
+
+/* Need:
+ * NULL
+ * INT_MAX
+ * UINT_MAX
+ * ZSTD_memcpy()
+ * ZSTD_memset()
+ * ZSTD_memmove()
+ */
+#ifndef ZSTD_DEPS_COMMON
+#define ZSTD_DEPS_COMMON
+
+#include <linux/limits.h>
+#include <linux/stddef.h>
+
+#define ZSTD_memcpy(d,s,n) __builtin_memcpy((d),(s),(n))
+#define ZSTD_memmove(d,s,n) __builtin_memmove((d),(s),(n))
+#define ZSTD_memset(d,s,n) __builtin_memset((d),(s),(n))
+
+#endif /* ZSTD_DEPS_COMMON */
+
+/*
+ * Define malloc as always failing. That means the user must
+ * either use ZSTD_customMem or statically allocate memory.
+ * Need:
+ * ZSTD_malloc()
+ * ZSTD_free()
+ * ZSTD_calloc()
+ */
+#ifdef ZSTD_DEPS_NEED_MALLOC
+#ifndef ZSTD_DEPS_MALLOC
+#define ZSTD_DEPS_MALLOC
+
+#define ZSTD_malloc(s) ({ (void)(s); NULL; })
+#define ZSTD_free(p) ((void)(p))
+#define ZSTD_calloc(n,s) ({ (void)(n); (void)(s); NULL; })
+
+#endif /* ZSTD_DEPS_MALLOC */
+#endif /* ZSTD_DEPS_NEED_MALLOC */
+
+/*
+ * Provides 64-bit math support.
+ * Need:
+ * U64 ZSTD_div64(U64 dividend, U32 divisor)
+ */
+#ifdef ZSTD_DEPS_NEED_MATH64
+#ifndef ZSTD_DEPS_MATH64
+#define ZSTD_DEPS_MATH64
+
+#include <linux/math64.h>
+
+static uint64_t ZSTD_div64(uint64_t dividend, uint32_t divisor) {
+  return div_u64(dividend, divisor);
+}
+
+#endif /* ZSTD_DEPS_MATH64 */
+#endif /* ZSTD_DEPS_NEED_MATH64 */
+
+/* 
+ * This is only requested when DEBUGLEVEL >= 1, meaning
+ * it is disabled in production.
+ * Need:
+ * assert()
+ */
+#ifdef ZSTD_DEPS_NEED_ASSERT
+#ifndef ZSTD_DEPS_ASSERT
+#define ZSTD_DEPS_ASSERT
+
+#include <linux/kernel.h>
+
+#define assert(x) WARN_ON((x))
+
+#endif /* ZSTD_DEPS_ASSERT */
+#endif /* ZSTD_DEPS_NEED_ASSERT */
+
+/* 
+ * This is only requested when DEBUGLEVEL >= 2, meaning
+ * it is disabled in production.
+ * Need:
+ * ZSTD_DEBUG_PRINT()
+ */
+#ifdef ZSTD_DEPS_NEED_IO
+#ifndef ZSTD_DEPS_IO
+#define ZSTD_DEPS_IO
+
+#include <linux/printk.h>
+
+#define ZSTD_DEBUG_PRINT(...) pr_debug(__VA_ARGS__)
+
+#endif /* ZSTD_DEPS_IO */
+#endif /* ZSTD_DEPS_NEED_IO */
+
+/* 
+ * Only requested when MSAN is enabled.
+ * Need:
+ * intptr_t
+ */
+#ifdef ZSTD_DEPS_NEED_STDINT
+#ifndef ZSTD_DEPS_STDINT
+#define ZSTD_DEPS_STDINT
+
+/*
+ * The Linux Kernel doesn't provide intptr_t, only uintptr_t, which
+ * is an unsigned long.
+ */
+typedef long intptr_t;
+
+#endif /* ZSTD_DEPS_STDINT */
+#endif /* ZSTD_DEPS_NEED_STDINT */
@@ -0,0 +1 @@
+seekable_tests
@@ -0,0 +1,38 @@
+# ################################################################
+# Copyright (c) 2017-present, Facebook, Inc.
+# All rights reserved.
+#
+# This source code is licensed under both the BSD-style license (found in the
+# LICENSE file in the root directory of this source tree) and the GPLv2 (found
+# in the COPYING file in the root directory of this source tree).
+# ################################################################
+
+# This Makefile presumes libzstd is built, using `make` in / or /lib/
+
+ZSTDLIB_PATH = ../../../lib
+ZSTDLIB_NAME = libzstd.a
+ZSTDLIB = $(ZSTDLIB_PATH)/$(ZSTDLIB_NAME)
+
+CPPFLAGS += -I../ -I$(ZSTDLIB_PATH) -I$(ZSTDLIB_PATH)/common
+
+CFLAGS ?= -O3
+CFLAGS += -g
+
+SEEKABLE_OBJS = ../zstdseek_compress.c ../zstdseek_decompress.c $(ZSTDLIB)
+
+.PHONY: default clean test
+
+default: seekable_tests
+
+test: seekable_tests
+	./seekable_tests
+
+$(ZSTDLIB):
+	$(MAKE) -C $(ZSTDLIB_PATH) $(ZSTDLIB_NAME)
+
+seekable_tests : seekable_tests.c $(SEEKABLE_OBJS)
+
+clean:
+	@rm -f core *.o tmp* result* *.zst \
+		seekable_tests
+	@echo Cleaning completed
@@ -0,0 +1,63 @@
+#include <stddef.h>
+#include <stdint.h>
+#include <stdio.h>
+
+#include "zstd_seekable.h"
+
+/* Basic unit tests for zstd seekable format */
+int main(int argc, const char** argv)
+{
+    unsigned testNb = 1;
+    printf("Beginning zstd seekable format tests...\n");
+    printf("Test %u - check that seekable decompress does not hang: ", testNb++);
+    {   /* Github issue #2335 */
+        const size_t compressed_size = 17;
+        const uint8_t compressed_data[17] = {
+            '^',
+            '*',
+            'M',
+            '\x18',
+            '\t',
+            '\x00',
+            '\x00',
+            '\x00',
+            '\x00',
+            '\x00',
+            '\x00',
+            '\x00',
+            ';',
+            (uint8_t)('\xb1'),
+            (uint8_t)('\xea'),
+            (uint8_t)('\x92'),
+            (uint8_t)('\x8f'),
+        };
+        const size_t uncompressed_size = 32;
+        uint8_t uncompressed_data[32];
+
+        ZSTD_seekable* stream = ZSTD_seekable_create();
+        size_t status = ZSTD_seekable_initBuff(stream, compressed_data, compressed_size);
+        if (ZSTD_isError(status)) {
+            ZSTD_seekable_free(stream);
+            goto _test_error;
+        }
+
+        const size_t offset = 2;
+        /* Should return an error, but not hang */
+        status = ZSTD_seekable_decompress(stream, uncompressed_data, uncompressed_size, offset);
+        if (!ZSTD_isError(status)) {
+            ZSTD_seekable_free(stream);
+            goto _test_error;
+        }
+
+        ZSTD_seekable_free(stream);
+    }
+    printf("Success!\n");
+
+    /* TODO: Add more tests */
+    printf("Finished tests\n");
+    return 0;
+
+_test_error:
+    printf("test failed! Exiting..\n");
+    return 1;
+}
@@ -53,7 +53,7 @@ __`Frame_Size`__
 The total size of the skippable frame, not including the `Skippable_Magic_Number` or `Frame_Size`.
 This is for compatibility with [Zstandard skippable frames].

-[Zstandard skippable frames]: https://github.com/facebook/zstd/blob/master/doc/zstd_compression_format.md#skippable-frames
+[Zstandard skippable frames]: https://github.com/facebook/zstd/blob/release/doc/zstd_compression_format.md#skippable-frames

 #### `Seek_Table_Footer`
 The seek table footer format is as follows:
@@ -79,6 +79,8 @@
 #define MIN(a, b) ((a) < (b) ? (a) : (b))
 #define MAX(a, b) ((a) > (b) ? (a) : (b))

+#define ZSTD_SEEKABLE_NO_OUTPUT_PROGRESS_MAX 16
+
 /* Special-case callbacks for FILE* and in-memory modes, so that we can treat
 * them the same way as the advanced API */
 static int ZSTD_seekable_read_FILE(void* opaque, void* buffer, size_t n)
@@ -380,6 +382,7 @@ size_t ZSTD_seekable_initAdvanced(ZSTD_seekable* zs, ZSTD_seekable_customFile sr
 size_t ZSTD_seekable_decompress(ZSTD_seekable* zs, void* dst, size_t len, unsigned long long offset)
 {
    U32 targetFrame = ZSTD_seekable_offsetToFrameIndex(zs, offset);
+    U32 noOutputProgressCount = 0;
    do {
        /* check if we can continue from a previous decompress job */
        if (targetFrame != zs->curFrame || offset != zs->decompressedOffset) {
@@ -398,6 +401,7 @@ size_t ZSTD_seekable_decompress(ZSTD_seekable* zs, void* dst, size_t len, unsign
            size_t toRead;
            ZSTD_outBuffer outTmp;
            size_t prevOutPos;
+            size_t forwardProgress;
            if (zs->decompressedOffset < offset) {
                /* dummy decompressions until we get to the target offset */
                outTmp = (ZSTD_outBuffer){zs->outBuff, MIN(SEEKABLE_BUFF_SIZE, offset - zs->decompressedOffset), 0};
@@ -415,7 +419,15 @@ size_t ZSTD_seekable_decompress(ZSTD_seekable* zs, void* dst, size_t len, unsign
                XXH64_update(&zs->xxhState, (BYTE*)outTmp.dst + prevOutPos,
                             outTmp.pos - prevOutPos);
            }
-            zs->decompressedOffset += outTmp.pos - prevOutPos;
+            forwardProgress = outTmp.pos - prevOutPos;
+            if (forwardProgress == 0) {
+                if (noOutputProgressCount++ > ZSTD_SEEKABLE_NO_OUTPUT_PROGRESS_MAX) {
+                    return ERROR(seekableIO);
+                }
+            } else {
+                noOutputProgressCount = 0;
+            }
+            zs->decompressedOffset += forwardProgress;

            if (toRead == 0) {
                /* frame complete */
@@ -12,7 +12,7 @@ IN_FILES="examples/emscripten.c"
 # Emscripten build using emcc.
 emscripten_emcc_build() {
  # Compile the the same example as above
-  CC_FLAGS="-Wall -Wextra -Werror -Os -g0 -flto"
+  CC_FLAGS="-Wall -Wextra -Wshadow -Werror -Os -g0 -flto"
  emcc $CC_FLAGS -s WASM=1 -I. -o $OUT_WASM $IN_FILES
  # Did compilation work?
  if [ $? -ne 0 ]; then
@@ -66,7 +66,7 @@ fi
 echo "Single file decoder creation script: PASSED"

 # Compile the generated output
-cc -Wall -Wextra -Werror -Os -g0 -o $OUT_FILE examples/simple.c
+cc -Wall -Wextra -Wshadow -Werror -Os -g0 -o $OUT_FILE examples/simple.c
 # Did compilation work?
 if [ $? -ne 0 ]; then
  echo "Compiling simple.c: FAILED"
@@ -15,7 +15,7 @@ IN_FILES="zstd.c examples/roundtrip.c"
 # Emscripten build using emcc.
 emscripten_emcc_build() {
  # Compile the the same example as above
-  CC_FLAGS="-Wall -Wextra -Werror -Os -g0 -flto"
+  CC_FLAGS="-Wall -Wextra -Wshadow -Werror -Os -g0 -flto"
  emcc $CC_FLAGS -s WASM=1 -I. -o $OUT_WASM $IN_FILES
  # Did compilation work?
  if [ $? -ne 0 ]; then
@@ -72,7 +72,7 @@ echo "Single file library creation script: PASSED"
 cp "$ZSTD_SRC_ROOT/zstd.h" zstd.h

 # Compile the generated output
-cc -Wall -Wextra -Werror -pthread -I. -Os -g0 -o $OUT_FILE zstd.c examples/roundtrip.c
+cc -Wall -Wextra -Werror -Wshadow -pthread -I. -Os -g0 -o $OUT_FILE zstd.c examples/roundtrip.c
 # Did compilation work?
 if [ $? -ne 0 ]; then
  echo "Compiling roundtrip.c: FAILED"
@@ -43,6 +43,11 @@
 #define ZSTD_MULTITHREAD
 #endif

+/* Include zstd_deps.h first with all the options we need enabled. */
+#define ZSTD_DEPS_NEED_MALLOC
+#define ZSTD_DEPS_NEED_MATH64
+#include "common/zstd_deps.h"
+
 #include "common/debug.c"
 #include "common/entropy_common.c"
 #include "common/error_private.c"
@@ -39,6 +39,10 @@
 #define ZSTD_LEGACY_SUPPORT 0
 #define ZSTD_STRIP_ERROR_STRINGS

+/* Include zstd_deps.h first with all the options we need enabled. */
+#define ZSTD_DEPS_NEED_MALLOC
+#include "common/zstd_deps.h"
+
 #include "common/debug.c"
 #include "common/entropy_common.c"
 #include "common/error_private.c"
@@ -16,7 +16,7 @@ Distribution of this document is unlimited.

 ### Version

-0.3.6 (25/05/20)
+0.3.7 (2020-12-09)


 Introduction
@@ -918,38 +918,41 @@ Note that blocks which are not `Compressed_Block` are skipped, they do not contr

 ###### Offset updates rules

-The newest offset takes the lead in offset history,
-shifting others back by one rank,
-up to the previous rank of the new offset _if it was present in history_.
+During the execution of the sequences of a `Compressed_Block`, the
+`Repeated_Offsets`' values are kept up to date, so that they always represent
+the three most-recently used offsets. In order to achieve that, they are
+updated after executing each sequence in the following way:

-__Examples__ :
+When the sequence's `offset_value` does not refer to one of the
+`Repeated_Offsets`--when it has value greater than 3, or when it has value 3
+and the sequence's `literals_length` is zero--the `Repeated_Offsets`' values
+are shifted back one, and `Repeated_Offset1` takes on the value of the
+just-used offset.

-In the common case, when new offset is not part of history :
-`Repeated_Offset3` = `Repeated_Offset2`
-`Repeated_Offset2` = `Repeated_Offset1`
-`Repeated_Offset1` = `NewOffset`
+Otherwise, when the sequence's `offset_value` refers to one of the
+`Repeated_Offsets`--when it has value 1 or 2, or when it has value 3 and the
+sequence's `literals_length` is non-zero--the `Repeated_Offsets` are re-ordered
+so that `Repeated_Offset1` takes on the value of the used Repeated_Offset, and
+the existing values are pushed back from the first `Repeated_Offset` through to
+the `Repeated_Offset` selected by the `offset_value`. This effectively performs
+a single-stepped wrapping rotation of the values of these offsets, so that
+their order again reflects the recency of their use.

-When the new offset _is_ part of history, there may be specific adjustments.
-
-When `NewOffset` == `Repeated_Offset1`, offset history remains actually unmodified.
-
-When `NewOffset` == `Repeated_Offset2`,
-`Repeated_Offset1` and `Repeated_Offset2` ranks are swapped.
-`Repeated_Offset3` is unmodified.
-
-When `NewOffset` == `Repeated_Offset3`,
-there is actually no difference with the common case :
-all offsets are shifted by one rank,
-`NewOffset` (== `Repeated_Offset3`) becomes the new `Repeated_Offset1`.
-
-Also worth mentioning, the specific corner case when `offset_value` == 3,
-and the literal length of the current sequence is zero.
-In which case , `NewOffset` = `Repeated_Offset1` - 1_byte.
-Here also, from an offset history update perspective, it's just a common case :
-`Repeated_Offset3` = `Repeated_Offset2`
-`Repeated_Offset2` = `Repeated_Offset1`
-`Repeated_Offset1` = `NewOffset` ( == `Repeated_Offset1` - 1_byte )
+The following table shows the values of the `Repeated_Offsets` as a series of
+sequences are applied to them:

+| `offset_value` | `literals_length` | `Repeated_Offset1` | `Repeated_Offset2` | `Repeated_Offset3` | Comment                 |
+|:--------------:|:-----------------:|:------------------:|:------------------:|:------------------:|:-----------------------:|
+|                |                   |                  1 |                  4 |                  8 | starting values         |
+|           1114 |                11 |               1111 |                  1 |                  4 | non-repeat              |
+|              1 |                22 |               1111 |                  1 |                  4 | repeat 1; no change     |
+|           2225 |                22 |               2222 |               1111 |                  1 | non-repeat              |
+|           1114 |               111 |               1111 |               2222 |               1111 | non-repeat              |
+|           3336 |                33 |               3333 |               1111 |               2222 | non-repeat              |
+|              2 |                22 |               1111 |               3333 |               2222 | repeat 2; swap 1 & 2    |
+|              3 |                33 |               2222 |               1111 |               3333 | repeat 3; rotate 3 to 1 |
+|              3 |                 0 |               2221 |               2222 |               1111 | insert resolved offset  |
+|              1 |                 0 |               2222 |               2221 |               3333 | repeat 2                |


 Skippable Frames
@@ -1440,7 +1443,7 @@ __`Entropy_Tables`__ : follow the same format as tables in [compressed blocks].
              Repeat distribution mode for sequence decoding.
              It's finally followed by 3 offset values, populating recent offsets (instead of using `{1,4,8}`),
              stored in order, 4-bytes __little-endian__ each, for a total of 12 bytes.
-              Each recent offset must have a value < dictionary size.
+              Each recent offset must have a value <= dictionary content size, and cannot equal 0.

 __`Content`__ : The rest of the dictionary is its content.
              The content act as a "past" in front of data to compress or decompress,
@@ -1666,6 +1669,7 @@ or at least provide a meaningful error code explaining for which reason it canno

 Version changes
 ---------------
+- 0.3.7 : clarifications for Repeat_Offsets
 - 0.3.6 : clarifications for Dictionary_ID
 - 0.3.5 : clarifications for Block_Maximum_Size
 - 0.3.4 : clarifications for FSE decoding table
@@ -1,10 +1,10 @@
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
-<title>zstd 1.4.5 Manual</title>
+<title>zstd 1.4.7 Manual</title>
 </head>
 <body>
-<h1>zstd 1.4.5 Manual</h1>
+<h1>zstd 1.4.7 Manual</h1>
 <hr>
 <a name="Contents"></a><h2>Contents</h2>
 <ol>
@@ -27,16 +27,10 @@
 <li><a href="#Chapter17">Advanced compression functions</a></li>
 <li><a href="#Chapter18">Advanced decompression functions</a></li>
 <li><a href="#Chapter19">Advanced streaming functions</a></li>
-<li><a href="#Chapter20">! ZSTD_initCStream_usingDict() :</a></li>
-<li><a href="#Chapter21">! ZSTD_initCStream_advanced() :</a></li>
-<li><a href="#Chapter22">! ZSTD_initCStream_usingCDict() :</a></li>
-<li><a href="#Chapter23">! ZSTD_initCStream_usingCDict_advanced() :</a></li>
-<li><a href="#Chapter24">This function is deprecated, and is equivalent to:</a></li>
-<li><a href="#Chapter25">This function is deprecated, and is equivalent to:</a></li>
-<li><a href="#Chapter26">Buffer-less and synchronous inner streaming functions</a></li>
-<li><a href="#Chapter27">Buffer-less streaming compression (synchronous mode)</a></li>
-<li><a href="#Chapter28">Buffer-less streaming decompression (synchronous mode)</a></li>
-<li><a href="#Chapter29">Block level API</a></li>
+<li><a href="#Chapter20">Buffer-less and synchronous inner streaming functions</a></li>
+<li><a href="#Chapter21">Buffer-less streaming compression (synchronous mode)</a></li>
+<li><a href="#Chapter22">Buffer-less streaming decompression (synchronous mode)</a></li>
+<li><a href="#Chapter23">Block level API</a></li>
 </ol>
 <hr>
 <a name="Chapter1"></a><h2>Introduction</h2><pre>
@@ -72,8 +66,14 @@

 <a name="Chapter2"></a><h2>Version</h2><pre></pre>

-<pre><b>unsigned ZSTD_versionNumber(void);   </b>/**< to check runtime library version */<b>
-</b></pre><BR>
+<pre><b>unsigned ZSTD_versionNumber(void);
+</b><p>  Return runtime library version, the value is (MAJOR*100*100 + MINOR*100 + RELEASE). 
+</p></pre><BR>
+
+<pre><b>const char* ZSTD_versionString(void);
+</b><p>  Return runtime library version, like "1.4.5". Requires v1.3.0+. 
+</p></pre><BR>
+
 <a name="Chapter3"></a><h2>Simple API</h2><pre></pre>

 <pre><b>size_t ZSTD_compress( void* dst, size_t dstCapacity,
@@ -277,7 +277,9 @@ size_t     ZSTD_freeDCtx(ZSTD_DCtx* dctx);
                                     * for large inputs, by finding large matches at long distance.
                                     * It increases memory usage and window size.
                                     * Note: enabling this parameter increases default ZSTD_c_windowLog to 128 MB
-                                     * except when expressly set to a different value. */
+                                     * except when expressly set to a different value.
+                                     * Note: will be enabled by default if ZSTD_c_windowLog >= 128 MB and
+                                     * compression strategy >= ZSTD_btopt (== compression level 16+) */
    ZSTD_c_ldmHashLog=161,   </b>/* Size of the table for long distance matching, as a power of 2.<b>
                              * Larger values increase memory usage and compression ratio,
                              * but decrease compression speed.
@@ -308,16 +310,20 @@ size_t     ZSTD_freeDCtx(ZSTD_DCtx* dctx);
    ZSTD_c_dictIDFlag=202,   </b>/* When applicable, dictionary's ID is written into frame header (default:1) */<b>

    </b>/* multi-threading parameters */<b>
-    </b>/* These parameters are only useful if multi-threading is enabled (compiled with build macro ZSTD_MULTITHREAD).<b>
-     * They return an error otherwise. */
+    </b>/* These parameters are only active if multi-threading is enabled (compiled with build macro ZSTD_MULTITHREAD).<b>
+     * Otherwise, trying to set any other value than default (0) will be a no-op and return an error.
+     * In a situation where it's unknown if the linked library supports multi-threading or not,
+     * setting ZSTD_c_nbWorkers to any value >= 1 and consulting the return value provides a quick way to check this property.
+     */
    ZSTD_c_nbWorkers=400,    </b>/* Select how many threads will be spawned to compress in parallel.<b>
-                              * When nbWorkers >= 1, triggers asynchronous mode when used with ZSTD_compressStream*() :
+                              * When nbWorkers >= 1, triggers asynchronous mode when invoking ZSTD_compressStream*() :
                              * ZSTD_compressStream*() consumes input and flush output if possible, but immediately gives back control to caller,
-                              * while compression work is performed in parallel, within worker threads.
+                              * while compression is performed in parallel, within worker thread(s).
                              * (note : a strong exception to this rule is when first invocation of ZSTD_compressStream2() sets ZSTD_e_end :
                              *  in which case, ZSTD_compressStream2() delegates to ZSTD_compress2(), which is always a blocking call).
                              * More workers improve speed, but also increase memory usage.
-                              * Default value is `0`, aka "single-threaded mode" : no worker is spawned, compression is performed inside Caller's thread, all invocations are blocking */
+                              * Default value is `0`, aka "single-threaded mode" : no worker is spawned,
+                              * compression is performed inside Caller's thread, and all invocations are blocking */
    ZSTD_c_jobSize=401,      </b>/* Size of a compression job. This value is enforced only when nbWorkers >= 1.<b>
                              * Each compression job is completed in parallel, so this value can indirectly impact the nb of active threads.
                              * 0 means default, which is dynamically determined based on compression parameters.
@@ -346,6 +352,11 @@ size_t     ZSTD_freeDCtx(ZSTD_DCtx* dctx);
     * ZSTD_c_literalCompressionMode
     * ZSTD_c_targetCBlockSize
     * ZSTD_c_srcSizeHint
+     * ZSTD_c_enableDedicatedDictSearch
+     * ZSTD_c_stableInBuffer
+     * ZSTD_c_stableOutBuffer
+     * ZSTD_c_blockDelimiters
+     * ZSTD_c_validateSequences
     * Because they are not stable, it's necessary to define ZSTD_STATIC_LINKING_ONLY to access them.
     * note : never ever use experimentalParam? names directly;
     *        also, the enums values themselves are unstable and can still change.
@@ -356,7 +367,12 @@ size_t     ZSTD_freeDCtx(ZSTD_DCtx* dctx);
     ZSTD_c_experimentalParam4=1001,
     ZSTD_c_experimentalParam5=1002,
     ZSTD_c_experimentalParam6=1003,
-     ZSTD_c_experimentalParam7=1004
+     ZSTD_c_experimentalParam7=1004,
+     ZSTD_c_experimentalParam8=1005,
+     ZSTD_c_experimentalParam9=1006,
+     ZSTD_c_experimentalParam10=1007,
+     ZSTD_c_experimentalParam11=1008,
+     ZSTD_c_experimentalParam12=1009
 } ZSTD_cParameter;
 </b></pre><BR>
 <pre><b>typedef struct {
@@ -456,11 +472,13 @@ size_t     ZSTD_freeDCtx(ZSTD_DCtx* dctx);
     * At the time of this writing, they include :
     * ZSTD_d_format
     * ZSTD_d_stableOutBuffer
+     * ZSTD_d_forceIgnoreChecksum
     * Because they are not stable, it's necessary to define ZSTD_STATIC_LINKING_ONLY to access them.
     * note : never ever use experimentalParam? names directly
     */
     ZSTD_d_experimentalParam1=1000,
-     ZSTD_d_experimentalParam2=1001
+     ZSTD_d_experimentalParam2=1001,
+     ZSTD_d_experimentalParam3=1002

 } ZSTD_dParameter;
 </b></pre><BR>
@@ -591,8 +609,9 @@ size_t ZSTD_freeCStream(ZSTD_CStream* zcs);
  - Compression parameters cannot be changed once compression is started (save a list of exceptions in multi-threading mode)
  - output->pos must be <= dstCapacity, input->pos must be <= srcSize
  - output->pos and input->pos will be updated. They are guaranteed to remain below their respective limit.
+  - endOp must be a valid directive
  - When nbWorkers==0 (default), function is blocking : it completes its job before returning to caller.
-  - When nbWorkers>=1, function is non-blocking : it just acquires a copy of input, and distributes jobs to internal worker threads, flush whatever is available,
+  - When nbWorkers>=1, function is non-blocking : it copies a portion of input, distributes jobs to internal worker threads, flush to output whatever is available,
                                                  and then immediately returns, just indicating that there is some data remaining to be flushed.
                                                  The function nonetheless guarantees forward progress : it will return only after it reads or write at least 1+ byte.
  - Exception : if the first call requests a ZSTD_e_end directive and provides enough dstCapacity, the function delegates to ZSTD_compress2() which is always blocking.
@@ -895,21 +914,40 @@ size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict);
 <BR></pre>

 <pre><b>typedef struct {
-    unsigned int matchPos; </b>/* Match pos in dst */<b>
-    </b>/* If seqDef.offset > 3, then this is seqDef.offset - 3<b>
-     * If seqDef.offset < 3, then this is the corresponding repeat offset
-     * But if seqDef.offset < 3 and litLength == 0, this is the
-     *   repeat offset before the corresponding repeat offset
-     * And if seqDef.offset == 3 and litLength == 0, this is the
-     *   most recent repeat offset - 1
-     */
-    unsigned int offset;
-    unsigned int litLength; </b>/* Literal length */<b>
-    unsigned int matchLength; </b>/* Match length */<b>
-    </b>/* 0 when seq not rep and seqDef.offset otherwise<b>
-     * when litLength == 0 this will be <= 4, otherwise <= 3 like normal
-     */
-    unsigned int rep;
+    unsigned int offset;      </b>/* The offset of the match. (NOT the same as the offset code)<b>
+                               * If offset == 0 and matchLength == 0, this sequence represents the last
+                               * literals in the block of litLength size.
+                               */
+
+    unsigned int litLength;   </b>/* Literal length of the sequence. */<b>
+    unsigned int matchLength; </b>/* Match length of the sequence. */<b>
+
+                              </b>/* Note: Users of this API may provide a sequence with matchLength == litLength == offset == 0.<b>
+                               * In this case, we will treat the sequence as a marker for a block boundary.
+                               */
+
+    unsigned int rep;         </b>/* Represents which repeat offset is represented by the field 'offset'.<b>
+                               * Ranges from [0, 3].
+                               *
+                               * Repeat offsets are essentially previous offsets from previous sequences sorted in
+                               * recency order. For more detail, see doc/zstd_compression_format.md
+                               *
+                               * If rep == 0, then 'offset' does not contain a repeat offset.
+                               * If rep > 0:
+                               *  If litLength != 0:
+                               *      rep == 1 --> offset == repeat_offset_1
+                               *      rep == 2 --> offset == repeat_offset_2
+                               *      rep == 3 --> offset == repeat_offset_3
+                               *  If litLength == 0:
+                               *      rep == 1 --> offset == repeat_offset_2
+                               *      rep == 2 --> offset == repeat_offset_3
+                               *      rep == 3 --> offset == repeat_offset_1 - 1
+                               *
+                               * Note: This field is optional. ZSTD_generateSequences() will calculate the value of
+                               * 'rep', but repeat offsets do not necessarily need to be calculated from an external
+                               * sequence provider's perspective. For example, ZSTD_compressSequences() does not
+                               * use this 'rep' field at all (as of now).
+                               */
 } ZSTD_Sequence;
 </b></pre><BR>
 <pre><b>typedef struct {
@@ -951,6 +989,12 @@ size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict);
                                 * Decoder cannot recognise automatically this format, requiring this instruction. */
 } ZSTD_format_e;
 </b></pre><BR>
+<pre><b>typedef enum {
+    </b>/* Note: this enum controls ZSTD_d_forceIgnoreChecksum */<b>
+    ZSTD_d_validateChecksum = 0,
+    ZSTD_d_ignoreChecksum = 1
+} ZSTD_forceIgnoreChecksum_e;
+</b></pre><BR>
 <pre><b>typedef enum {
    </b>/* Note: this enum and the behavior it controls are effectively internal<b>
     * implementation details of the compressor. They are expected to continue
@@ -1045,12 +1089,69 @@ size_t ZSTD_sizeof_DDict(const ZSTD_DDict* ddict);
           or an error code (if srcSize is too small) 
 </p></pre><BR>

-<pre><b>size_t ZSTD_getSequences(ZSTD_CCtx* zc, ZSTD_Sequence* outSeqs,
-    size_t outSeqsSize, const void* src, size_t srcSize);
-</b><p> Extract sequences from the sequence store
+<pre><b>typedef enum {
+  ZSTD_sf_noBlockDelimiters = 0,         </b>/* Representation of ZSTD_Sequence has no block delimiters, sequences only */<b>
+  ZSTD_sf_explicitBlockDelimiters = 1    </b>/* Representation of ZSTD_Sequence contains explicit block delimiters */<b>
+} ZSTD_sequenceFormat_e;
+</b></pre><BR>
+<pre><b></b><p> Generate sequences using ZSTD_compress2, given a source buffer.
+
+ Each block will end with a dummy sequence
+ with offset == 0, matchLength == 0, and litLength == length of last literals.
+ litLength may be == 0, and if so, then the sequence of (of: 0 ml: 0 ll: 0)
+ simply acts as a block delimiter.
+
 zc can be used to insert custom compression params.
 This function invokes ZSTD_compress2
- @return : number of sequences extracted
+
+ The output of this function can be fed into ZSTD_compressSequences() with CCtx
+ setting of ZSTD_c_blockDelimiters as ZSTD_sf_explicitBlockDelimiters
+ @return : number of sequences generated
+ 
+</p></pre><BR>
+
+<pre><b>size_t ZSTD_mergeBlockDelimiters(ZSTD_Sequence* sequences, size_t seqsSize);
+</b><p> Given an array of ZSTD_Sequence, remove all sequences that represent block delimiters/last literals
+ by merging them into into the literals of the next sequence.
+
+ As such, the final generated result has no explicit representation of block boundaries,
+ and the final last literals segment is not represented in the sequences.
+
+ The output of this function can be fed into ZSTD_compressSequences() with CCtx
+ setting of ZSTD_c_blockDelimiters as ZSTD_sf_noBlockDelimiters
+ @return : number of sequences left after merging
+ 
+</p></pre><BR>
+
+<pre><b>size_t ZSTD_compressSequences(ZSTD_CCtx* const cctx, void* dst, size_t dstSize,
+                      const ZSTD_Sequence* inSeqs, size_t inSeqsSize,
+                      const void* src, size_t srcSize);
+</b><p> Compress an array of ZSTD_Sequence, generated from the original source buffer, into dst.
+ If a dictionary is included, then the cctx should reference the dict. (see: ZSTD_CCtx_refCDict(), ZSTD_CCtx_loadDictionary(), etc.)
+ The entire source is compressed into a single frame.
+
+ The compression behavior changes based on cctx params. In particular:
+    If ZSTD_c_blockDelimiters == ZSTD_sf_noBlockDelimiters, the array of ZSTD_Sequence is expected to contain
+    no block delimiters (defined in ZSTD_Sequence). Block boundaries are roughly determined based on
+    the block size derived from the cctx, and sequences may be split. This is the default setting.
+
+    If ZSTD_c_blockDelimiters == ZSTD_sf_explicitBlockDelimiters, the array of ZSTD_Sequence is expected to contain
+    block delimiters (defined in ZSTD_Sequence). Behavior is undefined if no block delimiters are provided.
+
+    If ZSTD_c_validateSequences == 0, this function will blindly accept the sequences provided. Invalid sequences cause undefined
+    behavior. If ZSTD_c_validateSequences == 1, then if sequence is invalid (see doc/zstd_compression_format.md for
+    specifics regarding offset/matchlength requirements) then the function will bail out and return an error.
+
+    In addition to the two adjustable experimental params, there are other important cctx params.
+    - ZSTD_c_minMatch MUST be set as less than or equal to the smallest match generated by the match finder. It has a minimum value of ZSTD_MINMATCH_MIN.
+    - ZSTD_c_compressionLevel accordingly adjusts the strength of the entropy coder, as it would in typical compression.
+    - ZSTD_c_windowLog affects offset validation: this function will return an error at higher debug levels if a provided offset
+      is larger than what the spec allows for a given window log and dictionary (if present). See: doc/zstd_compression_format.md
+
+ Note: Repcodes are, as of now, always re-calculated within this function, so ZSTD_Sequence::rep is unused.
+ Note 2: Once we integrate ability to ingest repcodes, the explicit block delims mode must respect those repcodes exactly,
+         and cannot emit an RLE block that disagrees with the repcode history
+ @return : final compressed size or a ZSTD error.
 
 </p></pre><BR>

@@ -1141,7 +1242,11 @@ ZSTD_CStream* ZSTD_initStaticCStream(void* workspace, size_t workspaceSize);
 <pre><b>typedef void* (*ZSTD_allocFunction) (void* opaque, size_t size);
 typedef void  (*ZSTD_freeFunction) (void* opaque, void* address);
 typedef struct { ZSTD_allocFunction customAlloc; ZSTD_freeFunction customFree; void* opaque; } ZSTD_customMem;
-static ZSTD_customMem const ZSTD_defaultCMem = { NULL, NULL, NULL };  </b>/**< this constant defers to stdlib's functions */<b>
+static
+#ifdef __GNUC__
+__attribute__((__unused__))
+#endif
+ZSTD_customMem const ZSTD_defaultCMem = { NULL, NULL, NULL };  </b>/**< this constant defers to stdlib's functions */<b>
 </b><p>  These prototypes make it possible to pass your own allocation/free functions.
  ZSTD_customMem is provided at creation time, using ZSTD_create*_advanced() variants listed below.
  All allocation/free operations will be completed using these custom variants instead of regular <stdlib.h> ones.
@@ -1158,6 +1263,12 @@ static ZSTD_customMem const ZSTD_defaultCMem = { NULL, NULL, NULL };  </b>/**< t
  note: equivalent to ZSTD_createCDict_advanced(), with dictLoadMethod==ZSTD_dlm_byRef 
 </p></pre><BR>

+<pre><b>unsigned ZSTD_getDictID_fromCDict(const ZSTD_CDict* cdict);
+</b><p>  Provides the dictID of the dictionary loaded into `cdict`.
+  If @return == 0, the dictionary is not conformant to Zstandard specification, or empty.
+  Non-conformant dictionaries can still be loaded, but as content-only dictionaries. 
+</p></pre><BR>
+
 <pre><b>ZSTD_compressionParameters ZSTD_getCParams(int compressionLevel, unsigned long long estimatedSrcSize, size_t dictSize);
 </b><p> @return ZSTD_compressionParameters structure for a selected compression level and estimated srcSize.
 `estimatedSrcSize` value is optional, select 0 if not known 
@@ -1264,8 +1375,10 @@ size_t ZSTD_freeCCtxParams(ZSTD_CCtx_params* params);
 <pre><b>size_t ZSTD_CCtxParams_setParameter(ZSTD_CCtx_params* params, ZSTD_cParameter param, int value);
 </b><p>  Similar to ZSTD_CCtx_setParameter.
  Set one compression parameter, selected by enum ZSTD_cParameter.
-  Parameters must be applied to a ZSTD_CCtx using ZSTD_CCtx_setParametersUsingCCtxParams().
- @result : 0, or an error code (which can be tested with ZSTD_isError()).
+  Parameters must be applied to a ZSTD_CCtx using
+  ZSTD_CCtx_setParametersUsingCCtxParams().
+ @result : a code representing success or failure (which can be tested with
+           ZSTD_isError()).
 
 </p></pre><BR>

@@ -1342,6 +1455,13 @@ size_t ZSTD_freeCCtxParams(ZSTD_CCtx_params* params);
 
 </p></pre><BR>

+<pre><b>size_t ZSTD_DCtx_getParameter(ZSTD_DCtx* dctx, ZSTD_dParameter param, int* value);
+</b><p>  Get the requested decompression parameter value, selected by enum ZSTD_dParameter,
+  and store it into int* value.
+ @return : 0, or an error code (which can be tested with ZSTD_isError()).
+ 
+</p></pre><BR>
+
 <pre><b>size_t ZSTD_DCtx_setFormat(ZSTD_DCtx* dctx, ZSTD_format_e format);
 </b><p>  Instruct the decoder context about what kind of data to decode next.
  This instruction is mandatory to decode data without a fully-formed header,
@@ -1365,24 +1485,29 @@ size_t ZSTD_freeCCtxParams(ZSTD_CCtx_params* params);
  redundant functions will be deprecated, and then at some point removed.
 <BR></pre>

-<h3>Advanced Streaming compression functions</h3><pre></pre><b><pre></b>/**! ZSTD_initCStream_srcSize() :<b>
- * This function is deprecated, and equivalent to:
- *     ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
- *     ZSTD_CCtx_refCDict(zcs, NULL); // clear the dictionary (if any)
- *     ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel);
- *     ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize);
- *
- * pledgedSrcSize must be correct. If it is not known at init time, use
- * ZSTD_CONTENTSIZE_UNKNOWN. Note that, for compatibility with older programs,
- * "0" also disables frame content size field. It may be enabled in the future.
- * Note : this prototype will be marked as deprecated and generate compilation warnings on reaching v1.5.x
- */
-size_t
+<h3>Advanced Streaming compression functions</h3><pre></pre><b><pre></pre></b><BR>
+<pre><b>size_t
 ZSTD_initCStream_srcSize(ZSTD_CStream* zcs,
-                         int compressionLevel,
-                         unsigned long long pledgedSrcSize);
-</pre></b><BR>
-<a name="Chapter20"></a><h2>! ZSTD_initCStream_usingDict() :</h2><pre> This function is deprecated, and is equivalent to:
+             int compressionLevel,
+             unsigned long long pledgedSrcSize);
+</b><p> This function is deprecated, and equivalent to:
+     ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
+     ZSTD_CCtx_refCDict(zcs, NULL); // clear the dictionary (if any)
+     ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel);
+     ZSTD_CCtx_setPledgedSrcSize(zcs, pledgedSrcSize);
+
+ pledgedSrcSize must be correct. If it is not known at init time, use
+ ZSTD_CONTENTSIZE_UNKNOWN. Note that, for compatibility with older programs,
+ "0" also disables frame content size field. It may be enabled in the future.
+ Note : this prototype will be marked as deprecated and generate compilation warnings on reaching v1.5.x
+ 
+</p></pre><BR>
+
+<pre><b>size_t
+ZSTD_initCStream_usingDict(ZSTD_CStream* zcs,
+         const void* dict, size_t dictSize,
+               int compressionLevel);
+</b><p> This function is deprecated, and is equivalent to:
     ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
     ZSTD_CCtx_setParameter(zcs, ZSTD_c_compressionLevel, compressionLevel);
     ZSTD_CCtx_loadDictionary(zcs, dict, dictSize);
@@ -1393,9 +1518,14 @@ ZSTD_initCStream_srcSize(ZSTD_CStream* zcs,
 it begins with ZSTD_MAGIC_DICTIONARY, else as raw content) and ZSTD_dlm_byCopy.
 Note : this prototype will be marked as deprecated and generate compilation warnings on reaching v1.5.x
 
-<BR></pre>
+</p></pre><BR>

-<a name="Chapter21"></a><h2>! ZSTD_initCStream_advanced() :</h2><pre> This function is deprecated, and is approximately equivalent to:
+<pre><b>size_t
+ZSTD_initCStream_advanced(ZSTD_CStream* zcs,
+        const void* dict, size_t dictSize,
+              ZSTD_parameters params,
+              unsigned long long pledgedSrcSize);
+</b><p> This function is deprecated, and is approximately equivalent to:
     ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
     // Pseudocode: Set each zstd parameter and leave the rest as-is.
     for ((param, value) : params) {
@@ -1409,18 +1539,24 @@ ZSTD_initCStream_srcSize(ZSTD_CStream* zcs,
 If srcSize is not known at init time, use value ZSTD_CONTENTSIZE_UNKNOWN.
 Note : this prototype will be marked as deprecated and generate compilation warnings on reaching v1.5.x
 
-<BR></pre>
+</p></pre><BR>

-<a name="Chapter22"></a><h2>! ZSTD_initCStream_usingCDict() :</h2><pre> This function is deprecated, and equivalent to:
+<pre><b>size_t ZSTD_initCStream_usingCDict(ZSTD_CStream* zcs, const ZSTD_CDict* cdict);
+</b><p> This function is deprecated, and equivalent to:
     ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
     ZSTD_CCtx_refCDict(zcs, cdict);

 note : cdict will just be referenced, and must outlive compression session
 Note : this prototype will be marked as deprecated and generate compilation warnings on reaching v1.5.x
 
-<BR></pre>
+</p></pre><BR>

-<a name="Chapter23"></a><h2>! ZSTD_initCStream_usingCDict_advanced() :</h2><pre>   This function is DEPRECATED, and is approximately equivalent to:
+<pre><b>size_t
+ZSTD_initCStream_usingCDict_advanced(ZSTD_CStream* zcs,
+                   const ZSTD_CDict* cdict,
+                         ZSTD_frameParameters fParams,
+                         unsigned long long pledgedSrcSize);
+</b><p>   This function is DEPRECATED, and is approximately equivalent to:
     ZSTD_CCtx_reset(zcs, ZSTD_reset_session_only);
     // Pseudocode: Set each zstd frame parameter and leave the rest as-is.
     for ((fParam, value) : fParams) {
@@ -1434,7 +1570,7 @@ ZSTD_initCStream_srcSize(ZSTD_CStream* zcs,
 value ZSTD_CONTENTSIZE_UNKNOWN.
 Note : this prototype will be marked as deprecated and generate compilation warnings on reaching v1.5.x
 
-<BR></pre>
+</p></pre><BR>

 <pre><b>size_t ZSTD_resetCStream(ZSTD_CStream* zcs, unsigned long long pledgedSrcSize);
 </b><p> This function is deprecated, and is equivalent to:
@@ -1477,42 +1613,44 @@ ZSTD_initCStream_srcSize(ZSTD_CStream* zcs,
 
 </p></pre><BR>

-<h3>Advanced Streaming decompression functions</h3><pre></pre><b><pre></b>/**<b>
- * This function is deprecated, and is equivalent to:
- *
- *     ZSTD_DCtx_reset(zds, ZSTD_reset_session_only);
- *     ZSTD_DCtx_loadDictionary(zds, dict, dictSize);
- *
- * note: no dictionary will be used if dict == NULL or dictSize < 8
- * Note : this prototype will be marked as deprecated and generate compilation warnings on reaching v1.5.x
- */
-size_t ZSTD_initDStream_usingDict(ZSTD_DStream* zds, const void* dict, size_t dictSize);
-</pre></b><BR>
-<a name="Chapter24"></a><h2>This function is deprecated, and is equivalent to:</h2><pre>
+<h3>Advanced Streaming decompression functions</h3><pre></pre><b><pre></pre></b><BR>
+<pre><b>size_t ZSTD_initDStream_usingDict(ZSTD_DStream* zds, const void* dict, size_t dictSize);
+</b><p>
+     ZSTD_DCtx_reset(zds, ZSTD_reset_session_only);
+     ZSTD_DCtx_loadDictionary(zds, dict, dictSize);
+
+ note: no dictionary will be used if dict == NULL or dictSize < 8
+ Note : this prototype will be marked as deprecated and generate compilation warnings on reaching v1.5.x
+ 
+</p></pre><BR>
+
+<pre><b>size_t ZSTD_initDStream_usingDDict(ZSTD_DStream* zds, const ZSTD_DDict* ddict);
+</b><p>
     ZSTD_DCtx_reset(zds, ZSTD_reset_session_only);
     ZSTD_DCtx_refDDict(zds, ddict);

 note : ddict is referenced, it must outlive decompression session
 Note : this prototype will be marked as deprecated and generate compilation warnings on reaching v1.5.x
 
-<BR></pre>
+</p></pre><BR>

-<a name="Chapter25"></a><h2>This function is deprecated, and is equivalent to:</h2><pre>
+<pre><b>size_t ZSTD_resetDStream(ZSTD_DStream* zds);
+</b><p>
     ZSTD_DCtx_reset(zds, ZSTD_reset_session_only);

 re-use decompression parameters from previous init; saves dictionary loading
 Note : this prototype will be marked as deprecated and generate compilation warnings on reaching v1.5.x
 
-<BR></pre>
+</p></pre><BR>

-<a name="Chapter26"></a><h2>Buffer-less and synchronous inner streaming functions</h2><pre>
+<a name="Chapter20"></a><h2>Buffer-less and synchronous inner streaming functions</h2><pre>
  This is an advanced API, giving full control over buffer management, for users which need direct control over memory.
  But it's also a complex one, with several restrictions, documented below.
  Prefer normal streaming API for an easier experience.
 
 <BR></pre>

-<a name="Chapter27"></a><h2>Buffer-less streaming compression (synchronous mode)</h2><pre>
+<a name="Chapter21"></a><h2>Buffer-less streaming compression (synchronous mode)</h2><pre>
  A ZSTD_CCtx object is required to track streaming operations.
  Use ZSTD_createCCtx() / ZSTD_freeCCtx() to manage resource.
  ZSTD_CCtx object can be re-used multiple times within successive compression operations.
@@ -1548,7 +1686,7 @@ size_t ZSTD_compressBegin_usingCDict(ZSTD_CCtx* cctx, const ZSTD_CDict* cdict);
 size_t ZSTD_compressBegin_usingCDict_advanced(ZSTD_CCtx* const cctx, const ZSTD_CDict* const cdict, ZSTD_frameParameters const fParams, unsigned long long const pledgedSrcSize);   </b>/* compression parameters are already set within cdict. pledgedSrcSize must be correct. If srcSize is not known, use macro ZSTD_CONTENTSIZE_UNKNOWN */<b>
 size_t ZSTD_copyCCtx(ZSTD_CCtx* cctx, const ZSTD_CCtx* preparedCCtx, unsigned long long pledgedSrcSize); </b>/**<  note: if pledgedSrcSize is not known, use ZSTD_CONTENTSIZE_UNKNOWN */<b>
 </pre></b><BR>
-<a name="Chapter28"></a><h2>Buffer-less streaming decompression (synchronous mode)</h2><pre>
+<a name="Chapter22"></a><h2>Buffer-less streaming decompression (synchronous mode)</h2><pre>
  A ZSTD_DCtx object is required to track streaming operations.
  Use ZSTD_createDCtx() / ZSTD_freeDCtx() to manage it.
  A ZSTD_DCtx object can be re-used multiple times.
@@ -1644,7 +1782,7 @@ size_t ZSTD_decodingBufferSize_min(unsigned long long windowSize, unsigned long

 <pre><b>typedef enum { ZSTDnit_frameHeader, ZSTDnit_blockHeader, ZSTDnit_block, ZSTDnit_lastBlock, ZSTDnit_checksum, ZSTDnit_skippableFrame } ZSTD_nextInputType_e;
 </b></pre><BR>
-<a name="Chapter29"></a><h2>Block level API</h2><pre></pre>
+<a name="Chapter23"></a><h2>Block level API</h2><pre></pre>

 <pre><b></b><p>    Frame metadata cost is typically ~12 bytes, which can be non-negligible for very small blocks (< 100 bytes).
    But users will have to take in charge needed metadata to regenerate data, such as compressed and content sizes.
@@ -8,15 +8,15 @@
 # You may select, at your option, one of the above-listed licenses.
 # ################################################################

-# This Makefile presumes libzstd is installed, using `sudo make install`
+LIBDIR =../lib
+CPPFLAGS += -I$(LIBDIR)
+LIB = $(LIBDIR)/libzstd.a

-CPPFLAGS += -I../lib
-LIB = ../lib/libzstd.a
-
-.PHONY: default all clean test

+.PHONY: default
 default: all

+.PHONY: all
 all: simple_compression simple_decompression \
 	multiple_simple_compression\
 	dictionary_compression dictionary_decompression \
@@ -24,37 +24,39 @@ all: simple_compression simple_decompression \
 	multiple_streaming_compression streaming_memory_usage

 $(LIB) :
-	$(MAKE) -C ../lib libzstd.a
+	$(MAKE) -C $(LIBDIR) libzstd.a

-simple_compression : simple_compression.c common.h $(LIB)
-	$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
+simple_compression.o: common.h
+simple_compression : $(LIB)

-simple_decompression : simple_decompression.c common.h $(LIB)
-	$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
+simple_decompression.o: common.h
+simple_decompression : $(LIB)

-multiple_simple_compression : multiple_simple_compression.c common.h $(LIB)
-	$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
+multiple_simple_compression.o: common.h
+multiple_simple_compression : $(LIB)

-dictionary_compression : dictionary_compression.c common.h $(LIB)
-	$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
+dictionary_compression.o: common.h
+dictionary_compression : $(LIB)

-dictionary_decompression : dictionary_decompression.c common.h $(LIB)
-	$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
+dictionary_decompression.o: common.h
+dictionary_decompression : $(LIB)

-streaming_compression : streaming_compression.c common.h $(LIB)
-	$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
+streaming_compression.o: common.h
+streaming_compression : $(LIB)

-multiple_streaming_compression : multiple_streaming_compression.c common.h $(LIB)
-	$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
+multiple_streaming_compression.o: common.h
+multiple_streaming_compression : $(LIB)

-streaming_decompression : streaming_decompression.c common.h $(LIB)
-	$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
+streaming_decompression.o: common.h
+streaming_decompression : $(LIB)

-streaming_memory_usage : streaming_memory_usage.c $(LIB)
-	$(CC) $(CPPFLAGS) $(CFLAGS) $< $(LIB) $(LDFLAGS) -o $@
+streaming_memory_usage.o: common.h
+streaming_memory_usage : $(LIB)

+
+.PHONY:clean
 clean:
-	@rm -f core *.o tmp* result* *.zst \
+	@$(RM) core *.o tmp* result* *.zst \
        simple_compression simple_decompression \
        multiple_simple_compression \
        dictionary_compression dictionary_decompression \
@@ -62,6 +64,7 @@ clean:
        multiple_streaming_compression streaming_memory_usage
 	@echo Cleaning completed

+.PHONY:test
 test: all
 	cp README.md tmp
 	cp Makefile tmp2
@@ -0,0 +1,178 @@
+/*
+ * Copyright (c) 2020, Martin Liska, SUSE, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under both the BSD-style license (found in the
+ * LICENSE file in the root directory of this source tree) and the GPLv2 (found
+ * in the COPYING file in the root directory of this source tree).
+ * You may select, at your option, one of the above-listed licenses.
+ */
+
+
+#include <stdio.h>     // printf
+#include <stdlib.h>    // free
+#include <string.h>    // memset, strcat, strlen
+#include <zstd.h>      // presumes zstd library is installed
+#include "common.h"    // Helper functions, CHECK(), and CHECK_ZSTD()
+#include <pthread.h>
+
+typedef struct compress_args
+{
+  const char *fname;
+  char *outName;
+  int cLevel;
+#if defined(ZSTD_STATIC_LINKING_ONLY)
+  ZSTD_threadPool *pool;
+#endif
+} compress_args_t;
+
+static void *compressFile_orDie(void *data)
+{
+    compress_args_t *args = (compress_args_t *)data;
+    fprintf (stderr, "Starting compression of %s with level %d\n", args->fname, args->cLevel);
+    /* Open the input and output files. */
+    FILE* const fin  = fopen_orDie(args->fname, "rb");
+    FILE* const fout = fopen_orDie(args->outName, "wb");
+    /* Create the input and output buffers.
+     * They may be any size, but we recommend using these functions to size them.
+     * Performance will only suffer significantly for very tiny buffers.
+     */
+    size_t const buffInSize = ZSTD_CStreamInSize();
+    void*  const buffIn  = malloc_orDie(buffInSize);
+    size_t const buffOutSize = ZSTD_CStreamOutSize();
+    void*  const buffOut = malloc_orDie(buffOutSize);
+
+    /* Create the context. */
+    ZSTD_CCtx* const cctx = ZSTD_createCCtx();
+    CHECK(cctx != NULL, "ZSTD_createCCtx() failed!");
+
+#if defined(ZSTD_STATIC_LINKING_ONLY)
+    size_t r = ZSTD_CCtx_refThreadPool(cctx, args->pool);
+    CHECK(r == 0, "ZSTD_CCtx_refThreadPool failed!");
+#endif
+
+    /* Set any parameters you want.
+     * Here we set the compression level, and enable the checksum.
+     */
+    CHECK_ZSTD( ZSTD_CCtx_setParameter(cctx, ZSTD_c_compressionLevel, args->cLevel) );
+    CHECK_ZSTD( ZSTD_CCtx_setParameter(cctx, ZSTD_c_checksumFlag, 1) );
+    ZSTD_CCtx_setParameter(cctx, ZSTD_c_nbWorkers, 16);
+
+    /* This loop read from the input file, compresses that entire chunk,
+     * and writes all output produced to the output file.
+     */
+    size_t const toRead = buffInSize;
+    for (;;) {
+        size_t read = fread_orDie(buffIn, toRead, fin);
+        /* Select the flush mode.
+         * If the read may not be finished (read == toRead) we use
+         * ZSTD_e_continue. If this is the last chunk, we use ZSTD_e_end.
+         * Zstd optimizes the case where the first flush mode is ZSTD_e_end,
+         * since it knows it is compressing the entire source in one pass.
+         */
+        int const lastChunk = (read < toRead);
+        ZSTD_EndDirective const mode = lastChunk ? ZSTD_e_end : ZSTD_e_continue;
+        /* Set the input buffer to what we just read.
+         * We compress until the input buffer is empty, each time flushing the
+         * output.
+         */
+        ZSTD_inBuffer input = { buffIn, read, 0 };
+        int finished;
+        do {
+            /* Compress into the output buffer and write all of the output to
+             * the file so we can reuse the buffer next iteration.
+             */
+            ZSTD_outBuffer output = { buffOut, buffOutSize, 0 };
+            size_t const remaining = ZSTD_compressStream2(cctx, &output , &input, mode);
+            CHECK_ZSTD(remaining);
+            fwrite_orDie(buffOut, output.pos, fout);
+            /* If we're on the last chunk we're finished when zstd returns 0,
+             * which means its consumed all the input AND finished the frame.
+             * Otherwise, we're finished when we've consumed all the input.
+             */
+            finished = lastChunk ? (remaining == 0) : (input.pos == input.size);
+        } while (!finished);
+        CHECK(input.pos == input.size,
+              "Impossible: zstd only returns 0 when the input is completely consumed!");
+
+        if (lastChunk) {
+            break;
+        }
+    }
+
+    fprintf (stderr, "Finishing compression of %s\n", args->outName);
+
+    ZSTD_freeCCtx(cctx);
+    fclose_orDie(fout);
+    fclose_orDie(fin);
+    free(buffIn);
+    free(buffOut);
+    free(args->outName);
+
+    return NULL;
+}
+
+
+static char* createOutFilename_orDie(const char* filename)
+{
+    size_t const inL = strlen(filename);
+    size_t const outL = inL + 5;
+    void* const outSpace = malloc_orDie(outL);
+    memset(outSpace, 0, outL);
+    strcat(outSpace, filename);
+    strcat(outSpace, ".zst");
+    return (char*)outSpace;
+}
+
+int main(int argc, const char** argv)
+{
+    const char* const exeName = argv[0];
+
+    if (argc<=3) {
+        printf("wrong arguments\n");
+        printf("usage:\n");
+        printf("%s POOL_SIZE LEVEL FILES\n", exeName);
+        return 1;
+    }
+
+    int pool_size = atoi (argv[1]);
+    CHECK(pool_size != 0, "can't parse POOL_SIZE!");
+
+    int level = atoi (argv[2]);
+    CHECK(level != 0, "can't parse LEVEL!");
+
+    argc -= 3;
+    argv += 3;
+
+#if defined(ZSTD_STATIC_LINKING_ONLY)
+    ZSTD_threadPool *pool = ZSTD_createThreadPool (pool_size);
+    CHECK(pool != NULL, "ZSTD_createThreadPool() failed!");
+    fprintf (stderr, "Using shared thread pool of size %d\n", pool_size);
+#else
+    fprintf (stderr, "All threads use its own thread pool\n");
+#endif
+
+    pthread_t *threads = malloc_orDie(argc * sizeof(pthread_t));
+    compress_args_t *args = malloc_orDie(argc * sizeof(compress_args_t));
+
+    for (unsigned i = 0; i < argc; i++)
+    {
+      args[i].fname = argv[i];
+      args[i].outName = createOutFilename_orDie(args[i].fname);
+      args[i].cLevel = level;
+#if defined(ZSTD_STATIC_LINKING_ONLY)
+      args[i].pool = pool;
+#endif
+
+      pthread_create (&threads[i], NULL, compressFile_orDie, &args[i]);
+    }
+
+    for (unsigned i = 0; i < argc; i++)
+      pthread_join (threads[i], NULL);
+
+#if defined(ZSTD_STATIC_LINKING_ONLY)
+    ZSTD_freeThreadPool (pool);
+#endif
+
+    return 0;
+}
@@ -8,15 +8,16 @@
 # You may select, at your option, one of the above-listed licenses.
 # ################################################################

-Q = $(if $(filter 1,$(V) $(VERBOSE)),,@)
+.PHONY: default
+default: lib-release

-# When cross-compiling from linux to windows, you might
-# need to specify this as "Windows." Fedora build fails
-# without it.
-#
-# Note: mingw-w64 build from linux to windows does not
-# fail on other tested distros (ubuntu, debian) even
-# without manually specifying the TARGET_SYSTEM.
+# define silent mode as default (verbose mode with V=1 or VERBOSE=1)
+$(V)$(VERBOSE).SILENT:
+
+# When cross-compiling from linux to windows,
+# one might need to specify TARGET_SYSTEM as "Windows."
+# Building from Fedora fails without it.
+# (but Ubuntu and Debian don't need to set anything)
 TARGET_SYSTEM ?= $(OS)

 # Version numbers
@@ -31,22 +32,46 @@ LIBVER := $(shell echo $(LIBVER_SCRIPT))
 VERSION?= $(LIBVER)
 CCVER := $(shell $(CC) --version)

-CPPFLAGS+= -DXXH_NAMESPACE=ZSTD_
+# ZSTD_LIB_MINIFY is a helper variable that
+# configures a bunch of other variables to space-optimized defaults.
+ZSTD_LIB_MINIFY ?= 0
+ifneq ($(ZSTD_LIB_MINIFY), 0)
+  HAVE_CC_OZ ?= $(shell echo "" | $(CC) -Oz -x c -c - -o /dev/null 2> /dev/null && echo 1 || echo 0)
+  ZSTD_LEGACY_SUPPORT ?= 0
+  ZSTD_LIB_DEPRECATED ?= 0
+  HUF_FORCE_DECOMPRESS_X1 ?= 1
+  ZSTD_FORCE_DECOMPRESS_SHORT ?= 1
+  ZSTD_NO_INLINE ?= 1
+  ZSTD_STRIP_ERROR_STRINGS ?= 1
+ifneq ($(HAVE_CC_OZ), 0)
+    # Some compilers (clang) support an even more space-optimized setting.
+    CFLAGS += -Oz
+else
+    CFLAGS += -Os
+endif
+  CFLAGS += -fno-stack-protector -fomit-frame-pointer -fno-ident \
+            -DDYNAMIC_BMI2=0 -DNDEBUG
+else
+  CFLAGS += -O3
+endif
+
+DEBUGLEVEL ?= 0
+CPPFLAGS += -DXXH_NAMESPACE=ZSTD_ -DDEBUGLEVEL=$(DEBUGLEVEL)
 ifeq ($(TARGET_SYSTEM),Windows_NT)   # MinGW assumed
-CPPFLAGS   += -D__USE_MINGW_ANSI_STDIO   # compatibility with %zu formatting
+  CPPFLAGS += -D__USE_MINGW_ANSI_STDIO   # compatibility with %zu formatting
 endif
 DEBUGFLAGS= -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow \
            -Wstrict-aliasing=1 -Wswitch-enum -Wdeclaration-after-statement \
            -Wstrict-prototypes -Wundef -Wpointer-arith \
            -Wvla -Wformat=2 -Winit-self -Wfloat-equal -Wwrite-strings \
            -Wredundant-decls -Wmissing-prototypes -Wc++-compat
-CFLAGS  += $(DEBUGFLAGS) $(MOREFLAGS)
-FLAGS    = $(CPPFLAGS) $(CFLAGS)
+CFLAGS   += $(DEBUGFLAGS) $(MOREFLAGS)
+FLAGS     = $(CPPFLAGS) $(CFLAGS)

 HAVE_COLORNEVER = $(shell echo a | grep --color=never a > /dev/null 2> /dev/null && echo 1 || echo 0)
 GREP_OPTIONS ?=
 ifeq ($HAVE_COLORNEVER, 1)
-GREP_OPTIONS += --color=never
+  GREP_OPTIONS += --color=never
 endif
 GREP = grep $(GREP_OPTIONS)
 SED_ERE_OPT ?= -E
@@ -59,30 +84,7 @@ ZDEPR_FILES := $(sort $(wildcard deprecated/*.c))
 ZSTD_FILES := $(ZSTDCOMMON_FILES)

 ifeq ($(findstring GCC,$(CCVER)),GCC)
-decompress/zstd_decompress_block.o :	CFLAGS+=-fno-tree-vectorize
-endif
-
-# This is a helper variable that configures a bunch of other variables to new,
-# space-optimized defaults.
-ZSTD_LIB_MINIFY ?= 0
-ifneq ($(ZSTD_LIB_MINIFY), 0)
-	HAVE_CC_OZ ?= $(shell echo "" | $(CC) -Oz -x c -c - -o /dev/null 2> /dev/null && echo 1 || echo 0)
-	ZSTD_LEGACY_SUPPORT ?= 0
-	ZSTD_LIB_DEPRECATED ?= 0
-	HUF_FORCE_DECOMPRESS_X1 ?= 1
-	ZSTD_FORCE_DECOMPRESS_SHORT ?= 1
-	ZSTD_NO_INLINE ?= 1
-	ZSTD_STRIP_ERROR_STRINGS ?= 1
-	ifneq ($(HAVE_CC_OZ), 0)
-		# Some compilers (clang) support an even more space-optimized setting.
-		CFLAGS += -Oz
-	else
-		CFLAGS += -Os
-	endif
-	CFLAGS += -fno-stack-protector -fomit-frame-pointer -fno-ident \
-	          -DDYNAMIC_BMI2=0 -DNDEBUG
-else
-	CFLAGS += -O3
+decompress/zstd_decompress_block.o : CFLAGS+=-fno-tree-vectorize
 endif

 # Modules
@@ -104,116 +106,187 @@ ZSTD_NO_INLINE ?= 0
 ZSTD_STRIP_ERROR_STRINGS ?= 0

 ifeq ($(ZSTD_LIB_COMPRESSION), 0)
-	ZSTD_LIB_DICTBUILDER = 0
-	ZSTD_LIB_DEPRECATED = 0
+  ZSTD_LIB_DICTBUILDER = 0
+  ZSTD_LIB_DEPRECATED = 0
 endif

 ifeq ($(ZSTD_LIB_DECOMPRESSION), 0)
-	ZSTD_LEGACY_SUPPORT = 0
-	ZSTD_LIB_DEPRECATED = 0
+  ZSTD_LEGACY_SUPPORT = 0
+  ZSTD_LIB_DEPRECATED = 0
 endif

 ifneq ($(ZSTD_LIB_COMPRESSION), 0)
-	ZSTD_FILES += $(ZSTDCOMP_FILES)
+  ZSTD_FILES += $(ZSTDCOMP_FILES)
 endif

 ifneq ($(ZSTD_LIB_DECOMPRESSION), 0)
-	ZSTD_FILES += $(ZSTDDECOMP_FILES)
+  ZSTD_FILES += $(ZSTDDECOMP_FILES)
 endif

 ifneq ($(ZSTD_LIB_DEPRECATED), 0)
-	ZSTD_FILES += $(ZDEPR_FILES)
+  ZSTD_FILES += $(ZDEPR_FILES)
 endif

 ifneq ($(ZSTD_LIB_DICTBUILDER), 0)
-	ZSTD_FILES += $(ZDICT_FILES)
+  ZSTD_FILES += $(ZDICT_FILES)
 endif

 ifneq ($(HUF_FORCE_DECOMPRESS_X1), 0)
-	CFLAGS += -DHUF_FORCE_DECOMPRESS_X1
+  CFLAGS += -DHUF_FORCE_DECOMPRESS_X1
 endif

 ifneq ($(HUF_FORCE_DECOMPRESS_X2), 0)
-	CFLAGS += -DHUF_FORCE_DECOMPRESS_X2
+  CFLAGS += -DHUF_FORCE_DECOMPRESS_X2
 endif

 ifneq ($(ZSTD_FORCE_DECOMPRESS_SHORT), 0)
-	CFLAGS += -DZSTD_FORCE_DECOMPRESS_SHORT
+  CFLAGS += -DZSTD_FORCE_DECOMPRESS_SHORT
 endif

 ifneq ($(ZSTD_FORCE_DECOMPRESS_LONG), 0)
-	CFLAGS += -DZSTD_FORCE_DECOMPRESS_LONG
+  CFLAGS += -DZSTD_FORCE_DECOMPRESS_LONG
 endif

 ifneq ($(ZSTD_NO_INLINE), 0)
-	CFLAGS += -DZSTD_NO_INLINE
+  CFLAGS += -DZSTD_NO_INLINE
 endif

 ifneq ($(ZSTD_STRIP_ERROR_STRINGS), 0)
-	CFLAGS += -DZSTD_STRIP_ERROR_STRINGS
+  CFLAGS += -DZSTD_STRIP_ERROR_STRINGS
 endif

 ifneq ($(ZSTD_LEGACY_MULTITHREADED_API), 0)
-	CFLAGS += -DZSTD_LEGACY_MULTITHREADED_API
+  CFLAGS += -DZSTD_LEGACY_MULTITHREADED_API
 endif

 ifneq ($(ZSTD_LEGACY_SUPPORT), 0)
 ifeq ($(shell test $(ZSTD_LEGACY_SUPPORT) -lt 8; echo $$?), 0)
-	ZSTD_FILES += $(shell ls legacy/*.c | $(GREP) 'v0[$(ZSTD_LEGACY_SUPPORT)-7]')
+  ZSTD_FILES += $(shell ls legacy/*.c | $(GREP) 'v0[$(ZSTD_LEGACY_SUPPORT)-7]')
 endif
 endif
 CPPFLAGS  += -DZSTD_LEGACY_SUPPORT=$(ZSTD_LEGACY_SUPPORT)

-ZSTD_OBJ   := $(patsubst %.c,%.o,$(ZSTD_FILES))
+ZSTD_LOCAL_SRC := $(notdir $(ZSTD_FILES))
+ZSTD_LOCAL_OBJ := $(ZSTD_LOCAL_SRC:.c=.o)
+
+ZSTD_SUBDIR := common compress decompress dictBuilder legacy deprecated
+vpath %.c $(ZSTD_SUBDIR)
+
+UNAME := $(shell uname)
+
+ifndef BUILD_DIR
+ifeq ($(UNAME), Darwin)
+  HASH ?= md5
+else ifeq ($(UNAME), FreeBSD)
+  HASH ?= gmd5sum
+else ifeq ($(UNAME), OpenBSD)
+  HASH ?= md5
+endif
+HASH ?= md5sum
+
+HASH_DIR = conf_$(shell echo $(CC) $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) $(ZSTD_FILES) | $(HASH) | cut -f 1 -d " " )
+HAVE_HASH :=$(shell echo 1 | $(HASH) > /dev/null && echo 1 || echo 0)
+ifeq ($(HAVE_HASH),0)
+  $(info warning : could not find HASH ($(HASH)), needed to differentiate builds using different flags)
+  BUILD_DIR := obj/generic_noconf
+endif
+endif # BUILD_DIR
+

 # macOS linker doesn't support -soname, and use different extension
 # see : https://developer.apple.com/library/mac/documentation/DeveloperTools/Conceptual/DynamicLibraries/100-Articles/DynamicLibraryDesignGuidelines.html
-ifeq ($(shell uname), Darwin)
-	SHARED_EXT = dylib
-	SHARED_EXT_MAJOR = $(LIBVER_MAJOR).$(SHARED_EXT)
-	SHARED_EXT_VER = $(LIBVER).$(SHARED_EXT)
-	SONAME_FLAGS = -install_name $(LIBDIR)/libzstd.$(SHARED_EXT_MAJOR) -compatibility_version $(LIBVER_MAJOR) -current_version $(LIBVER)
+ifeq ($(UNAME), Darwin)
+  SHARED_EXT = dylib
+  SHARED_EXT_MAJOR = $(LIBVER_MAJOR).$(SHARED_EXT)
+  SHARED_EXT_VER = $(LIBVER).$(SHARED_EXT)
+  SONAME_FLAGS = -install_name $(LIBDIR)/libzstd.$(SHARED_EXT_MAJOR) -compatibility_version $(LIBVER_MAJOR) -current_version $(LIBVER)
 else
-	SONAME_FLAGS = -Wl,-soname=libzstd.$(SHARED_EXT).$(LIBVER_MAJOR)
-	SHARED_EXT = so
-	SHARED_EXT_MAJOR = $(SHARED_EXT).$(LIBVER_MAJOR)
-	SHARED_EXT_VER = $(SHARED_EXT).$(LIBVER)
+  SONAME_FLAGS = -Wl,-soname=libzstd.$(SHARED_EXT).$(LIBVER_MAJOR)
+  SHARED_EXT = so
+  SHARED_EXT_MAJOR = $(SHARED_EXT).$(LIBVER_MAJOR)
+  SHARED_EXT_VER = $(SHARED_EXT).$(LIBVER)
 endif

+SET_CACHE_DIRECTORY = \
+	$(MAKE) --no-print-directory $@ \
+    BUILD_DIR=obj/$(HASH_DIR) \
+    CPPFLAGS="$(CPPFLAGS)" \
+    CFLAGS="$(CFLAGS)" \
+    LDFLAGS="$(LDFLAGS)"

-.PHONY: default lib-all all clean install uninstall

-default: lib-release
+.PHONY: lib-all all clean install uninstall

 # alias
 lib-all: all

 all: lib

-libzstd.a: ARFLAGS = rcs
-libzstd.a: $(ZSTD_OBJ)
+.PHONY: libzstd.a  # must be run every time
+
+ifndef BUILD_DIR
+# determine BUILD_DIR from compilation flags
+
+libzstd.a:
+	$(SET_CACHE_DIRECTORY)
+
+else
+# BUILD_DIR is defined
+
+ZSTD_STATLIB_DIR := $(BUILD_DIR)/static
+ZSTD_STATLIB := $(ZSTD_STATLIB_DIR)/libzstd.a
+ZSTD_STATLIB_OBJ := $(addprefix $(ZSTD_STATLIB_DIR)/,$(ZSTD_LOCAL_OBJ))
+$(ZSTD_STATLIB): ARFLAGS = rcs
+$(ZSTD_STATLIB): | $(ZSTD_STATLIB_DIR)
+$(ZSTD_STATLIB): $(ZSTD_STATLIB_OBJ)
 	@echo compiling static library
-	$(Q)$(AR) $(ARFLAGS) $@ $^
+	$(AR) $(ARFLAGS) $@ $^
+
+libzstd.a: $(ZSTD_STATLIB)
+	cp -f $< $@
+
+endif

 ifneq (,$(filter Windows%,$(TARGET_SYSTEM)))

-LIBZSTD = dll\libzstd.dll
+LIBZSTD = dll/libzstd.dll
 $(LIBZSTD): $(ZSTD_FILES)
 	@echo compiling dynamic library $(LIBVER)
-	$(CC) $(FLAGS) -DZSTD_DLL_EXPORT=1 -Wl,--out-implib,dll\libzstd.dll.a -shared $^ -o $@
+	$(CC) $(FLAGS) -DZSTD_DLL_EXPORT=1 -Wl,--out-implib,dll/libzstd.dll.a -shared $^ -o $@

-else
+else  # not Windows

 LIBZSTD = libzstd.$(SHARED_EXT_VER)
-$(LIBZSTD): LDFLAGS += -shared -fPIC -fvisibility=hidden
-$(LIBZSTD): $(ZSTD_FILES)
-	@echo compiling dynamic library $(LIBVER)
-	$(Q)$(CC) $(FLAGS) $^ $(LDFLAGS) $(SONAME_FLAGS) -o $@
-	@echo creating versioned links
-	$(Q)ln -sf $@ libzstd.$(SHARED_EXT_MAJOR)
-	$(Q)ln -sf $@ libzstd.$(SHARED_EXT)
+.PHONY: $(LIBZSTD)  # must be run every time
+$(LIBZSTD): CFLAGS += -fPIC
+$(LIBZSTD): LDFLAGS += -shared -fvisibility=hidden

-endif
+ifndef BUILD_DIR
+# determine BUILD_DIR from compilation flags
+
+$(LIBZSTD):
+	$(SET_CACHE_DIRECTORY)
+
+else
+# BUILD_DIR is defined
+
+ZSTD_DYNLIB_DIR := $(BUILD_DIR)/dynamic
+ZSTD_DYNLIB := $(ZSTD_DYNLIB_DIR)/$(LIBZSTD)
+ZSTD_DYNLIB_OBJ := $(addprefix $(ZSTD_DYNLIB_DIR)/,$(ZSTD_LOCAL_OBJ))
+
+$(ZSTD_DYNLIB): | $(ZSTD_DYNLIB_DIR)
+$(ZSTD_DYNLIB): $(ZSTD_DYNLIB_OBJ)
+	@echo compiling dynamic library $(LIBVER)
+	$(CC) $(FLAGS) $^ $(LDFLAGS) $(SONAME_FLAGS) -o $@
+	@echo creating versioned links
+	ln -sf $@ libzstd.$(SHARED_EXT_MAJOR)
+	ln -sf $@ libzstd.$(SHARED_EXT)
+
+$(LIBZSTD): $(ZSTD_DYNLIB)
+	cp -f $< $@
+
+endif  # ifndef BUILD_DIR
+endif  # if windows

 .PHONY: libzstd
 libzstd : $(LIBZSTD)
@@ -221,6 +294,7 @@ libzstd : $(LIBZSTD)
 .PHONY: lib
 lib : libzstd.a libzstd

+
 # note : do not define lib-mt or lib-release as .PHONY
 # make does not consider implicit pattern rule for .PHONY target

@@ -234,6 +308,28 @@ lib : libzstd.a libzstd
 	@echo release build completed


+# Generate .h dependencies automatically
+
+DEPFLAGS = -MT $@ -MMD -MP -MF
+
+$(ZSTD_DYNLIB_DIR)/%.o : %.c $(ZSTD_DYNLIB_DIR)/%.d | $(ZSTD_DYNLIB_DIR)
+	@echo CC $@
+	$(COMPILE.c) $(DEPFLAGS) $(ZSTD_DYNLIB_DIR)/$*.d $(OUTPUT_OPTION) $<
+
+$(ZSTD_STATLIB_DIR)/%.o : %.c $(ZSTD_STATLIB_DIR)/%.d | $(ZSTD_STATLIB_DIR)
+	@echo CC $@
+	$(COMPILE.c) $(DEPFLAGS) $(ZSTD_STATLIB_DIR)/$*.d $(OUTPUT_OPTION) $<
+
+MKDIR ?= mkdir
+$(BUILD_DIR) $(ZSTD_DYNLIB_DIR) $(ZSTD_STATLIB_DIR):
+	$(MKDIR) -p $@
+
+DEPFILES := $(ZSTD_DYNLIB_OBJ:.o=.d) $(ZSTD_STATLIB_OBJ:.o=.d)
+$(DEPFILES):
+
+include $(wildcard $(DEPFILES))
+
+
 # Special case : building library in single-thread mode _and_ without zstdmt_compress.c
 ZSTDMT_FILES = compress/zstdmt_compress.c
 ZSTD_NOMT_FILES = $(filter-out $(ZSTDMT_FILES),$(ZSTD_FILES))
@@ -241,22 +337,24 @@ libzstd-nomt: LDFLAGS += -shared -fPIC -fvisibility=hidden
 libzstd-nomt: $(ZSTD_NOMT_FILES)
 	@echo compiling single-thread dynamic library $(LIBVER)
 	@echo files : $(ZSTD_NOMT_FILES)
-	$(Q)$(CC) $(FLAGS) $^ $(LDFLAGS) $(SONAME_FLAGS) -o $@
+	$(CC) $(FLAGS) $^ $(LDFLAGS) $(SONAME_FLAGS) -o $@

 clean:
-	$(Q)$(RM) -r *.dSYM   # macOS-specific
-	$(Q)$(RM) core *.o *.a *.gcda *.$(SHARED_EXT) *.$(SHARED_EXT).* libzstd.pc
-	$(Q)$(RM) dll/libzstd.dll dll/libzstd.lib libzstd-nomt*
-	$(Q)$(RM) common/*.o compress/*.o decompress/*.o dictBuilder/*.o legacy/*.o deprecated/*.o
+	$(RM) -r *.dSYM   # macOS-specific
+	$(RM) core *.o *.a *.gcda *.$(SHARED_EXT) *.$(SHARED_EXT).* libzstd.pc
+	$(RM) dll/libzstd.dll dll/libzstd.lib libzstd-nomt*
+	$(RM) -r obj/*
 	@echo Cleaning library completed

 #-----------------------------------------------------------------------------
 # make install is validated only for below listed environments
 #-----------------------------------------------------------------------------
-ifneq (,$(filter $(shell uname),Linux Darwin GNU/kFreeBSD GNU OpenBSD FreeBSD NetBSD DragonFly SunOS Haiku))
+ifneq (,$(filter $(UNAME),Linux Darwin GNU/kFreeBSD GNU OpenBSD FreeBSD NetBSD DragonFly SunOS Haiku))

 all: libzstd.pc

+HAS_EXPLICIT_EXEC_PREFIX := $(if $(or $(EXEC_PREFIX),$(exec_prefix)),1,)
+
 DESTDIR     ?=
 # directory variables : GNU conventions prefer lowercase
 # see https://www.gnu.org/prep/standards/html_node/Makefile-Conventions.html
@@ -270,35 +368,28 @@ LIBDIR      ?= $(libdir)
 includedir  ?= $(PREFIX)/include
 INCLUDEDIR  ?= $(includedir)

-PCLIBDIR ?= $(shell echo "$(LIBDIR)" | sed -n $(SED_ERE_OPT) -e "s@^$(EXEC_PREFIX)(/|$$)@@p")
-PCINCDIR ?= $(shell echo "$(INCLUDEDIR)" | sed -n $(SED_ERE_OPT) -e "s@^$(PREFIX)(/|$$)@@p")
+PCINCDIR := $(patsubst $(PREFIX)%,%,$(INCLUDEDIR))
+PCLIBDIR := $(patsubst $(EXEC_PREFIX)%,%,$(LIBDIR))

-ifeq (,$(PCLIBDIR))
-# Additional prefix check is required, since the empty string is technically a
-# valid PCLIBDIR
-ifeq (,$(shell echo "$(LIBDIR)" | sed -n $(SED_ERE_OPT) -e "\\@^$(EXEC_PREFIX)(/|$$)@ p"))
-$(error configured libdir ($(LIBDIR)) is outside of prefix ($(PREFIX)), can't generate pkg-config file)
-endif
-endif
+# If we successfully stripped off a prefix, we'll add a reference to the
+# relevant pc variable.
+PCINCPREFIX := $(if $(findstring $(INCLUDEDIR),$(PCINCDIR)),,$${prefix})
+PCLIBPREFIX := $(if $(findstring $(LIBDIR),$(PCLIBDIR)),,$${exec_prefix})

-ifeq (,$(PCINCDIR))
-# Additional prefix check is required, since the empty string is technically a
-# valid PCINCDIR
-ifeq (,$(shell echo "$(INCLUDEDIR)" | sed -n $(SED_ERE_OPT) -e "\\@^$(PREFIX)(/|$$)@ p"))
-$(error configured includedir ($(INCLUDEDIR)) is outside of exec_prefix ($(EXEC_PREFIX)), can't generate pkg-config file)
-endif
-endif
+# If no explicit EXEC_PREFIX was set by the caller, write it out as a reference
+# to PREFIX, rather than as a resolved value.
+PCEXEC_PREFIX := $(if $(HAS_EXPLICIT_EXEC_PREFIX),$(EXEC_PREFIX),$${prefix})

-ifneq (,$(filter $(shell uname),FreeBSD NetBSD DragonFly))
-PKGCONFIGDIR ?= $(PREFIX)/libdata/pkgconfig
+ifneq (,$(filter $(UNAME),FreeBSD NetBSD DragonFly))
+  PKGCONFIGDIR ?= $(PREFIX)/libdata/pkgconfig
 else
-PKGCONFIGDIR ?= $(LIBDIR)/pkgconfig
+  PKGCONFIGDIR ?= $(LIBDIR)/pkgconfig
 endif

-ifneq (,$(filter $(shell uname),SunOS))
-INSTALL ?= ginstall
+ifneq (,$(filter $(UNAME),SunOS))
+  INSTALL ?= ginstall
 else
-INSTALL ?= install
+  INSTALL ?= install
 endif

 INSTALL_PROGRAM ?= $(INSTALL)
@@ -308,9 +399,11 @@ INSTALL_DATA    ?= $(INSTALL) -m 644
 libzstd.pc:
 libzstd.pc: libzstd.pc.in
 	@echo creating pkgconfig
-	$(Q)@sed $(SED_ERE_OPT) -e 's|@PREFIX@|$(PREFIX)|' \
-          -e 's|@LIBDIR@|$(PCLIBDIR)|' \
-          -e 's|@INCLUDEDIR@|$(PCINCDIR)|' \
+	@sed $(SED_ERE_OPT) \
+	        -e 's|@PREFIX@|$(PREFIX)|' \
+	        -e 's|@EXEC_PREFIX@|$(PCEXEC_PREFIX)|' \
+          -e 's|@INCLUDEDIR@|$(PCINCPREFIX)$(PCINCDIR)|' \
+          -e 's|@LIBDIR@|$(PCLIBPREFIX)$(PCLIBDIR)|' \
          -e 's|@VERSION@|$(VERSION)|' \
          $< >$@

@@ -318,37 +411,41 @@ install: install-pc install-static install-shared install-includes
 	@echo zstd static and shared library installed

 install-pc: libzstd.pc
-	$(Q)$(INSTALL) -d -m 755 $(DESTDIR)$(PKGCONFIGDIR)/
-	$(Q)$(INSTALL_DATA) libzstd.pc $(DESTDIR)$(PKGCONFIGDIR)/
+	[ -e $(DESTDIR)$(PKGCONFIGDIR) ] || $(INSTALL) -d -m 755 $(DESTDIR)$(PKGCONFIGDIR)/
+	$(INSTALL_DATA) libzstd.pc $(DESTDIR)$(PKGCONFIGDIR)/

-install-static: libzstd.a
+install-static:
+	# only generate libzstd.a if it's not already present
+	[ -e libzstd.a ] || $(MAKE) libzstd.a-release
+	[ -e $(DESTDIR)$(LIBDIR) ] || $(INSTALL) -d -m 755 $(DESTDIR)$(LIBDIR)/
 	@echo Installing static library
-	$(Q)$(INSTALL) -d -m 755 $(DESTDIR)$(LIBDIR)/
-	$(Q)$(INSTALL_DATA) libzstd.a $(DESTDIR)$(LIBDIR)
+	$(INSTALL_DATA) libzstd.a $(DESTDIR)$(LIBDIR)

-install-shared: libzstd
+install-shared:
+	# only generate libzstd.so if it's not already present
+	[ -e $(LIBZSTD) ] || $(MAKE) libzstd-release
+	[ -e $(DESTDIR)$(LIBDIR) ] || $(INSTALL) -d -m 755 $(DESTDIR)$(LIBDIR)/
 	@echo Installing shared library
-	$(Q)$(INSTALL) -d -m 755 $(DESTDIR)$(LIBDIR)/
-	$(Q)$(INSTALL_PROGRAM) $(LIBZSTD) $(DESTDIR)$(LIBDIR)
-	$(Q)ln -sf $(LIBZSTD) $(DESTDIR)$(LIBDIR)/libzstd.$(SHARED_EXT_MAJOR)
-	$(Q)ln -sf $(LIBZSTD) $(DESTDIR)$(LIBDIR)/libzstd.$(SHARED_EXT)
+	$(INSTALL_PROGRAM) $(LIBZSTD) $(DESTDIR)$(LIBDIR)
+	ln -sf $(LIBZSTD) $(DESTDIR)$(LIBDIR)/libzstd.$(SHARED_EXT_MAJOR)
+	ln -sf $(LIBZSTD) $(DESTDIR)$(LIBDIR)/libzstd.$(SHARED_EXT)

 install-includes:
+	[ -e $(DESTDIR)$(INCLUDEDIR) ] || $(INSTALL) -d -m 755 $(DESTDIR)$(INCLUDEDIR)/
 	@echo Installing includes
-	$(Q)$(INSTALL) -d -m 755 $(DESTDIR)$(INCLUDEDIR)/
-	$(Q)$(INSTALL_DATA) zstd.h $(DESTDIR)$(INCLUDEDIR)
-	$(Q)$(INSTALL_DATA) common/zstd_errors.h $(DESTDIR)$(INCLUDEDIR)
-	$(Q)$(INSTALL_DATA) dictBuilder/zdict.h $(DESTDIR)$(INCLUDEDIR)
+	$(INSTALL_DATA) zstd.h $(DESTDIR)$(INCLUDEDIR)
+	$(INSTALL_DATA) common/zstd_errors.h $(DESTDIR)$(INCLUDEDIR)
+	$(INSTALL_DATA) dictBuilder/zdict.h $(DESTDIR)$(INCLUDEDIR)

 uninstall:
-	$(Q)$(RM) $(DESTDIR)$(LIBDIR)/libzstd.a
-	$(Q)$(RM) $(DESTDIR)$(LIBDIR)/libzstd.$(SHARED_EXT)
-	$(Q)$(RM) $(DESTDIR)$(LIBDIR)/libzstd.$(SHARED_EXT_MAJOR)
-	$(Q)$(RM) $(DESTDIR)$(LIBDIR)/$(LIBZSTD)
-	$(Q)$(RM) $(DESTDIR)$(PKGCONFIGDIR)/libzstd.pc
-	$(Q)$(RM) $(DESTDIR)$(INCLUDEDIR)/zstd.h
-	$(Q)$(RM) $(DESTDIR)$(INCLUDEDIR)/zstd_errors.h
-	$(Q)$(RM) $(DESTDIR)$(INCLUDEDIR)/zdict.h
+	$(RM) $(DESTDIR)$(LIBDIR)/libzstd.a
+	$(RM) $(DESTDIR)$(LIBDIR)/libzstd.$(SHARED_EXT)
+	$(RM) $(DESTDIR)$(LIBDIR)/libzstd.$(SHARED_EXT_MAJOR)
+	$(RM) $(DESTDIR)$(LIBDIR)/$(LIBZSTD)
+	$(RM) $(DESTDIR)$(PKGCONFIGDIR)/libzstd.pc
+	$(RM) $(DESTDIR)$(INCLUDEDIR)/zstd.h
+	$(RM) $(DESTDIR)$(INCLUDEDIR)/zstd_errors.h
+	$(RM) $(DESTDIR)$(INCLUDEDIR)/zdict.h
 	@echo zstd libraries successfully uninstalled

 endif
@@ -143,6 +143,14 @@ The file structure is designed to make this selection manually achievable for an
  Setting this macro will either force to generate the BMI2 dispatcher (1)
  or prevent it (0). It overrides automatic detection.

+- The build macro `ZSTD_NO_UNUSED_FUNCTIONS` can be defined to hide the definitions of functions
+  that zstd does not use. Not all unused functions are hidden, but they can be if needed.
+  Currently, this macro will hide function definitions in FSE and HUF that use an excessive
+  amount of stack space.
+
+- The build macro `ZSTD_NO_INTRINSICS` can be defined to disable all explicit intrinsics.
+  Compiler builtins are still used.
+

 #### Windows : using MinGW+MSYS to create DLL

@@ -160,6 +168,26 @@ file it should be linked with `dll\libzstd.dll`. For example:
 The compiled executable will require ZSTD DLL which is available at `dll\libzstd.dll`.


+#### Advanced Build options
+
+The build system requires a hash function in order to
+separate object files created with different compilation flags.
+By default, it tries to use `md5sum` or equivalent.
+The hash function can be manually switched by setting the `HASH` variable.
+For example : `make HASH=xxhsum`
+The hash function needs to generate at least 64-bit using hexadecimal format.
+When no hash function is found,
+the Makefile just generates all object files into the same default directory,
+irrespective of compilation flags.
+This functionality only matters if `libzstd` is compiled multiple times
+with different build flags.
+
+The build directory, where object files are stored
+can also be manually controlled using variable `BUILD_DIR`,
+for example `make BUILD_DIR=objectDir/v1`.
+In which case, the hash function doesn't matter.
+
+
 #### Deprecated API

 Obsolete API on their way out are stored in directory `lib/deprecated`.
@@ -17,7 +17,6 @@
 #if defined (__cplusplus)
 extern "C" {
 #endif
-
 /*
 *  This API consists of small unitary functions, which must be inlined for best performance.
 *  Since link-time-optimization is not available for all compilers,
@@ -36,10 +35,12 @@ extern "C" {
 /*=========================================
 *  Target specific
 =========================================*/
-#if defined(__BMI__) && defined(__GNUC__)
-#  include <immintrin.h>   /* support for bextr (experimental) */
-#elif defined(__ICCARM__)
-#  include <intrinsics.h>
+#ifndef ZSTD_NO_INTRINSICS
+#  if defined(__BMI__) && defined(__GNUC__)
+#    include <immintrin.h>   /* support for bextr (experimental) */
+#  elif defined(__ICCARM__)
+#    include <intrinsics.h>
+#  endif
 #endif

 #define STREAM_ACCUMULATOR_MIN_32  25
@@ -141,8 +142,12 @@ MEM_STATIC unsigned BIT_highbit32 (U32 val)
    assert(val != 0);
    {
 #   if defined(_MSC_VER)   /* Visual */
-        unsigned long r=0;
-        return _BitScanReverse ( &r, val ) ? (unsigned)r : 0;
+#       if STATIC_BMI2 == 1
+		return _lzcnt_u32(val) ^ 31;
+#       else
+		unsigned long r = 0;
+		return _BitScanReverse(&r, val) ? (unsigned)r : 0;
+#       endif
 #   elif defined(__GNUC__) && (__GNUC__ >= 3)   /* Use GCC Intrinsic */
        return __builtin_clz (val) ^ 31;
 #   elif defined(__ICCARM__)    /* IAR Intrinsic */
@@ -198,7 +203,7 @@ MEM_STATIC size_t BIT_initCStream(BIT_CStream_t* bitC,
 MEM_STATIC void BIT_addBits(BIT_CStream_t* bitC,
                            size_t value, unsigned nbBits)
 {
-    MEM_STATIC_ASSERT(BIT_MASK_SIZE == 32);
+    DEBUG_STATIC_ASSERT(BIT_MASK_SIZE == 32);
    assert(nbBits < BIT_MASK_SIZE);
    assert(nbBits + bitC->bitPos < sizeof(bitC->bitContainer) * 8);
    bitC->bitContainer |= (value & BIT_mask[nbBits]) << bitC->bitPos;
@@ -271,7 +276,7 @@ MEM_STATIC size_t BIT_closeCStream(BIT_CStream_t* bitC)
 */
 MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, size_t srcSize)
 {
-    if (srcSize < 1) { memset(bitD, 0, sizeof(*bitD)); return ERROR(srcSize_wrong); }
+    if (srcSize < 1) { ZSTD_memset(bitD, 0, sizeof(*bitD)); return ERROR(srcSize_wrong); }

    bitD->start = (const char*)srcBuffer;
    bitD->limitPtr = bitD->start + sizeof(bitD->bitContainer);
@@ -317,12 +322,12 @@ MEM_STATIC size_t BIT_initDStream(BIT_DStream_t* bitD, const void* srcBuffer, si
    return srcSize;
 }

-MEM_STATIC size_t BIT_getUpperBits(size_t bitContainer, U32 const start)
+MEM_STATIC FORCE_INLINE_ATTR size_t BIT_getUpperBits(size_t bitContainer, U32 const start)
 {
    return bitContainer >> start;
 }

-MEM_STATIC size_t BIT_getMiddleBits(size_t bitContainer, U32 const start, U32 const nbBits)
+MEM_STATIC FORCE_INLINE_ATTR size_t BIT_getMiddleBits(size_t bitContainer, U32 const start, U32 const nbBits)
 {
    U32 const regMask = sizeof(bitContainer)*8 - 1;
    /* if start > regMask, bitstream is corrupted, and result is undefined */
@@ -330,10 +335,14 @@ MEM_STATIC size_t BIT_getMiddleBits(size_t bitContainer, U32 const start, U32 co
    return (bitContainer >> (start & regMask)) & BIT_mask[nbBits];
 }

-MEM_STATIC size_t BIT_getLowerBits(size_t bitContainer, U32 const nbBits)
+MEM_STATIC FORCE_INLINE_ATTR size_t BIT_getLowerBits(size_t bitContainer, U32 const nbBits)
 {
+#if defined(STATIC_BMI2) && STATIC_BMI2 == 1
+	return  _bzhi_u64(bitContainer, nbBits);
+#else
    assert(nbBits < BIT_MASK_SIZE);
    return bitContainer & BIT_mask[nbBits];
+#endif
 }

 /*! BIT_lookBits() :
@@ -342,7 +351,7 @@ MEM_STATIC size_t BIT_getLowerBits(size_t bitContainer, U32 const nbBits)
 *  On 32-bits, maxNbBits==24.
 *  On 64-bits, maxNbBits==56.
 * @return : value extracted */
-MEM_STATIC size_t BIT_lookBits(const BIT_DStream_t* bitD, U32 nbBits)
+MEM_STATIC  FORCE_INLINE_ATTR size_t BIT_lookBits(const BIT_DStream_t*  bitD, U32 nbBits)
 {
    /* arbitrate between double-shift and shift+mask */
 #if 1
@@ -365,7 +374,7 @@ MEM_STATIC size_t BIT_lookBitsFast(const BIT_DStream_t* bitD, U32 nbBits)
    return (bitD->bitContainer << (bitD->bitsConsumed & regMask)) >> (((regMask+1)-nbBits) & regMask);
 }

-MEM_STATIC void BIT_skipBits(BIT_DStream_t* bitD, U32 nbBits)
+MEM_STATIC FORCE_INLINE_ATTR void BIT_skipBits(BIT_DStream_t* bitD, U32 nbBits)
 {
    bitD->bitsConsumed += nbBits;
 }
@@ -374,7 +383,7 @@ MEM_STATIC void BIT_skipBits(BIT_DStream_t* bitD, U32 nbBits)
 *  Read (consume) next n bits from local register and update.
 *  Pay attention to not read more than nbBits contained into local register.
 * @return : extracted value. */
-MEM_STATIC size_t BIT_readBits(BIT_DStream_t* bitD, unsigned nbBits)
+MEM_STATIC FORCE_INLINE_ATTR size_t BIT_readBits(BIT_DStream_t* bitD, unsigned nbBits)
 {
    size_t const value = BIT_lookBits(bitD, nbBits);
    BIT_skipBits(bitD, nbBits);
@@ -39,14 +39,14 @@
 #endif

 /**
-  On MSVC qsort requires that functions passed into it use the __cdecl calling conversion(CC). 
-  This explictly marks such functions as __cdecl so that the code will still compile 
+  On MSVC qsort requires that functions passed into it use the __cdecl calling conversion(CC).
+  This explictly marks such functions as __cdecl so that the code will still compile
  if a CC other than __cdecl has been made the default.
 */
 #if  defined(_MSC_VER)
 #  define WIN_CDECL __cdecl
 #else
-#  define WIN_CDECL 
+#  define WIN_CDECL
 #endif

 /**
@@ -125,12 +125,12 @@
 #    include <mmintrin.h>   /* https://msdn.microsoft.com/fr-fr/library/84szxsww(v=vs.90).aspx */
 #    define PREFETCH_L1(ptr)  _mm_prefetch((const char*)(ptr), _MM_HINT_T0)
 #    define PREFETCH_L2(ptr)  _mm_prefetch((const char*)(ptr), _MM_HINT_T1)
-#    elif defined(__aarch64__)
-#     define PREFETCH_L1(ptr)  __asm__ __volatile__("prfm pldl1keep, %0" ::"Q"(*(ptr)))
-#     define PREFETCH_L2(ptr)  __asm__ __volatile__("prfm pldl2keep, %0" ::"Q"(*(ptr)))
 #  elif defined(__GNUC__) && ( (__GNUC__ >= 4) || ( (__GNUC__ == 3) && (__GNUC_MINOR__ >= 1) ) )
 #    define PREFETCH_L1(ptr)  __builtin_prefetch((ptr), 0 /* rw==read */, 3 /* locality */)
 #    define PREFETCH_L2(ptr)  __builtin_prefetch((ptr), 0 /* rw==read */, 2 /* locality */)
+#  elif defined(__aarch64__)
+#    define PREFETCH_L1(ptr)  __asm__ __volatile__("prfm pldl1keep, %0" ::"Q"(*(ptr)))
+#    define PREFETCH_L2(ptr)  __asm__ __volatile__("prfm pldl2keep, %0" ::"Q"(*(ptr)))
 #  else
 #    define PREFETCH_L1(ptr) (void)(ptr)  /* disabled */
 #    define PREFETCH_L2(ptr) (void)(ptr)  /* disabled */
@@ -183,4 +183,106 @@
 #  pragma warning(disable : 4324)        /* disable: C4324: padded structure */
 #endif

+/*Like DYNAMIC_BMI2 but for compile time determination of BMI2 support*/
+#ifndef STATIC_BMI2
+#  if defined(_MSC_VER) && (defined(_M_X64) || defined(_M_I86))
+#    ifdef __AVX2__  //MSVC does not have a BMI2 specific flag, but every CPU that supports AVX2 also supports BMI2
+#       define STATIC_BMI2 1
+#    endif
+#  endif
+#endif
+
+#ifndef STATIC_BMI2
+    #define STATIC_BMI2 0
+#endif
+
+/* compat. with non-clang compilers */
+#ifndef __has_builtin
+#  define __has_builtin(x) 0
+#endif
+
+/* compat. with non-clang compilers */
+#ifndef __has_feature
+#  define __has_feature(x) 0
+#endif
+
+/* detects whether we are being compiled under msan */
+#ifndef ZSTD_MEMORY_SANITIZER
+#  if __has_feature(memory_sanitizer)
+#    define ZSTD_MEMORY_SANITIZER 1
+#  else
+#    define ZSTD_MEMORY_SANITIZER 0
+#  endif
+#endif
+
+#if ZSTD_MEMORY_SANITIZER
+/* Not all platforms that support msan provide sanitizers/msan_interface.h.
+ * We therefore declare the functions we need ourselves, rather than trying to
+ * include the header file... */
+#include <stddef.h>  /* size_t */
+#define ZSTD_DEPS_NEED_STDINT
+#include "zstd_deps.h"  /* intptr_t */
+
+/* Make memory region fully initialized (without changing its contents). */
+void __msan_unpoison(const volatile void *a, size_t size);
+
+/* Make memory region fully uninitialized (without changing its contents).
+   This is a legacy interface that does not update origin information. Use
+   __msan_allocated_memory() instead. */
+void __msan_poison(const volatile void *a, size_t size);
+
+/* Returns the offset of the first (at least partially) poisoned byte in the
+   memory range, or -1 if the whole range is good. */
+intptr_t __msan_test_shadow(const volatile void *x, size_t size);
+#endif
+
+/* detects whether we are being compiled under asan */
+#ifndef ZSTD_ADDRESS_SANITIZER
+#  if __has_feature(address_sanitizer)
+#    define ZSTD_ADDRESS_SANITIZER 1
+#  elif defined(__SANITIZE_ADDRESS__)
+#    define ZSTD_ADDRESS_SANITIZER 1
+#  else
+#    define ZSTD_ADDRESS_SANITIZER 0
+#  endif
+#endif
+
+#if ZSTD_ADDRESS_SANITIZER
+/* Not all platforms that support asan provide sanitizers/asan_interface.h.
+ * We therefore declare the functions we need ourselves, rather than trying to
+ * include the header file... */
+#include <stddef.h>  /* size_t */
+
+/**
+ * Marks a memory region (<c>[addr, addr+size)</c>) as unaddressable.
+ *
+ * This memory must be previously allocated by your program. Instrumented
+ * code is forbidden from accessing addresses in this region until it is
+ * unpoisoned. This function is not guaranteed to poison the entire region -
+ * it could poison only a subregion of <c>[addr, addr+size)</c> due to ASan
+ * alignment restrictions.
+ *
+ * \note This function is not thread-safe because no two threads can poison or
+ * unpoison memory in the same memory region simultaneously.
+ *
+ * \param addr Start of memory region.
+ * \param size Size of memory region. */
+void __asan_poison_memory_region(void const volatile *addr, size_t size);
+
+/**
+ * Marks a memory region (<c>[addr, addr+size)</c>) as addressable.
+ *
+ * This memory must be previously allocated by your program. Accessing
+ * addresses in this region is allowed until this region is poisoned again.
+ * This function could unpoison a super-region of <c>[addr, addr+size)</c> due
+ * to ASan alignment restrictions.
+ *
+ * \note This function is not thread-safe because no two threads can
+ * poison or unpoison memory in the same memory region simultaneously.
+ *
+ * \param addr Start of memory region.
+ * \param size Size of memory region. */
+void __asan_unpoison_memory_region(void const volatile *addr, size_t size);
+#endif
+
 #endif /* ZSTD_COMPILER_H */
--- a/Show More
+++ b/Show More