Squashed 'librocksdb-sys/lz4/' content from commit 5ff83968

git-subtree-dir: librocksdb-sys/lz4 git-subtree-split: 5ff839680134437dbf4678f3d0c7b371d84f4964
1 year ago · c43e79ce9f
commit c43e79ce9f
187 changed files with 39183 additions and 0 deletions
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@ -0,0 +1,75 @@
 # This configuration was automatically generated from a CircleCI 1.0 config.
 # It should include any build commands you had along with commands that CircleCI
 # inferred from your project structure. We strongly recommend you read all the
 # comments in this file to understand the structure of CircleCI 2.0, as the idiom
 # for configuration has changed substantially in 2.0 to allow arbitrary jobs rather
 # than the prescribed lifecycle of 1.0. In general, we recommend using this generated
 # configuration as a reference rather than using it in production, though in most
 # cases it should duplicate the execution of your original 1.0 config.
 version: 2
 jobs:
  build:
    working_directory: ~/lz4/lz4
    # Parallelism is broken in this file : it just plays the same tests twice.
    # The script will have to be modified to support parallelism properly
    # In the meantime, set it to 1.
    parallelism: 1
    shell: /bin/bash --login
    # CircleCI 2.0 does not support environment variables that refer to each other the same way as 1.0 did.
    # If any of these refer to each other, rewrite them so that they don't or see https://circleci.com/docs/2.0/env-vars/#interpolating-environment-variables-to-set-other-environment-variables .
    environment:
      CIRCLE_ARTIFACTS: /tmp/circleci-artifacts
      CIRCLE_TEST_REPORTS: /tmp/circleci-test-results
    # In CircleCI 1.0 we used a pre-configured image with a large number of languages and other packages.
    # In CircleCI 2.0 you can now specify your own image, or use one of our pre-configured images.
    # The following configuration line tells CircleCI to use the specified docker image as the runtime environment for you job.
    # We have selected a pre-built image that mirrors the build environment we use on
    # the 1.0 platform, but we recommend you choose an image more tailored to the needs
    # of each job. For more information on choosing an image (or alternatively using a
    # VM instead of a container) see https://circleci.com/docs/2.0/executor-types/
    # To see the list of pre-built images that CircleCI provides for most common languages see
    # https://circleci.com/docs/2.0/circleci-images/
    docker:
    - image: fbopensource/lz4-circleci-primary:0.0.4
    steps:
    # Machine Setup
    #   If you break your build into multiple jobs with workflows, you will probably want to do the parts of this that are relevant in each
    # The following `checkout` command checks out your code to your working directory. In 1.0 we did this implicitly. In 2.0 you can choose where in the course of a job your code should be checked out.
    - checkout
    # Prepare for artifact and test results  collection equivalent to how it was done on 1.0.
    # In many cases you can simplify this from what is generated here.
    # 'See docs on artifact collection here https://circleci.com/docs/2.0/artifacts/'
    - run: mkdir -p $CIRCLE_ARTIFACTS $CIRCLE_TEST_REPORTS
    # Test
    #   This would typically be a build job when using workflows, possibly combined with build
    # This is based on your 1.0 configuration file or project settings
    - run: CFLAGS= make clangtest && make clean
    - run: g++ -v; make cxxtest   && make clean
    - run: gcc -v; g++ -v; make ctocpptest && make clean
    - run: gcc-5 -v; CC=gcc-5 CFLAGS="-O2 -Werror" make check && make clean
    - run: gcc-5 -v; CC=gcc-5 CFLAGS="-O2 -m32 -Werror" CPPFLAGS=-I/usr/include/x86_64-linux-gnu make check && make clean
    - run: gcc-6 -v; CC=gcc-6 MOREFLAGS="-O2 -Werror" make check  && make clean
    - run: make cmake               && make clean
    - run: make -C tests test-lz4
    - run: make -C tests test-lz4c
    - run: make -C tests test-frametest
    - run: make -C tests test-fuzzer && make clean
    - run: make -C lib all          && make clean
    - run: pyenv global 3.4.4; make versionsTest MOREFLAGS=-I/usr/include/x86_64-linux-gnu && make clean
    - run: make travis-install      && make clean
    - run: gcc -v; CFLAGS="-O2 -m32 -Werror" CPPFLAGS=-I/usr/include/x86_64-linux-gnu make check && make clean
    - run: clang -v; make staticAnalyze && make clean
    - run: make platformTest CC=powerpc-linux-gnu-gcc QEMU_SYS=qemu-ppc-static                  && make clean
    - run: make platformTest CC=powerpc-linux-gnu-gcc QEMU_SYS=qemu-ppc64-static MOREFLAGS=-m64 && make clean
    - run: make platformTest CC=arm-linux-gnueabi-gcc QEMU_SYS=qemu-arm-static                  && make clean
    - run: make platformTest CC=aarch64-linux-gnu-gcc QEMU_SYS=qemu-aarch64-static              && make clean
    # Teardown
    #   If you break your build into multiple jobs with workflows, you will probably want to do the parts of this that are relevant in each
    # Save test results
    - store_test_results:
        path: /tmp/circleci-test-results
    # Save artifacts
    - store_artifacts:
        path: /tmp/circleci-artifacts
    - store_artifacts:
        path: /tmp/circleci-test-results
--- a/.circleci/images/primary/Dockerfile
+++ b/.circleci/images/primary/Dockerfile
@ -0,0 +1,12 @@
 FROM circleci/buildpack-deps:bionic
 RUN sudo apt-get -y -qq update
 RUN sudo apt-get -y install software-properties-common
 RUN sudo add-apt-repository -y ppa:ubuntu-toolchain-r/test
 RUN sudo apt-get -y install cmake
 RUN sudo apt-get -y install qemu-system-ppc qemu-user-static qemu-system-arm
 RUN sudo apt-get -y install libc6-dev-armel-cross  libc6-dev-arm64-cross libc6-dev-i386
 RUN sudo apt-get -y install clang clang-tools
 RUN sudo apt-get -y install gcc-5 gcc-5-multilib gcc-6
 RUN sudo apt-get -y install valgrind
 RUN sudo apt-get -y install gcc-multilib-powerpc-linux-gnu gcc-powerpc-linux-gnu gcc-arm-linux-gnueabi gcc-aarch64-linux-gnu
--- a/.cirrus.yml
+++ b/.cirrus.yml
@ -0,0 +1,5 @@
 freebsd_instance:
  image_family: freebsd-12-2
 task:
  script: pkg install -y gmake && gmake test
--- a/.gitattributes
+++ b/.gitattributes
@ -0,0 +1,21 @@
 # Set the default behavior
 * text eol=lf
 # Explicitly declare source files
 *.c text eol=lf
 *.h text eol=lf
 # Denote files that should not be modified.
 *.odt binary
 *.png binary
 # Visual Studio
 *.sln text eol=crlf
 *.vcxproj* text eol=crlf
 *.vcproj* text eol=crlf
 *.suo binary
 *.rc text eol=crlf
 # Windows
 *.bat text eol=crlf
 *.cmd text eol=crlf
--- a/.github/ISSUE_TEMPLATE/bug_report.md
+++ b/.github/ISSUE_TEMPLATE/bug_report.md
@ -0,0 +1,32 @@
 ---
 name: Bug report
 about: Create a report to help us improve
 title: ''
 labels: ''
 assignees: ''
 ---
 **Describe the bug**
 A clear and concise description of what the bug is.
 **Expected behavior**
 Please describe what you expected to happen.
 **To Reproduce**
 Steps to reproduce the behavior:
 1. Go to '...'
 2. Click on '....'
 3. Scroll down to '....'
 4. See error '...'
 If applicable, add screenshots to help explain your problem.
 **System (please complete the following information):**
 - OS: [e.g. Mac]
 - Version [e.g. 22]
 - Compiler [e.g. gcc]
 - Build System [e.g. Makefile]
 - Other hardware specs [e.g. Core 2 duo...]
 **Additional context**
 Add any other context about the problem here.
--- a/.github/ISSUE_TEMPLATE/feature_request.md
+++ b/.github/ISSUE_TEMPLATE/feature_request.md
@ -0,0 +1,20 @@
 ---
 name: Feature request
 about: Suggest an idea for this project
 title: ''
 labels: ''
 assignees: ''
 ---
 **Is your feature request related to a problem? Please describe.**
 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
 **Describe the solution you'd like**
 A clear and concise description of what you want to happen.
 **Describe alternatives you've considered**
 A clear and concise description of any alternative solutions or features you've considered.
 **Additional context**
 Add any other context or screenshots about the feature request here.
--- a/.github/workflows/README.md
+++ b/.github/workflows/README.md
@ -0,0 +1,61 @@
 This directory contains [GitHub Actions](https://github.com/features/actions) workflow files.
 # Known issues
 ## USAN, ASAN (`lz4-ubsan-x64`, `lz4-ubsan-x86`, `lz4-asan-x64`)
 For now, `lz4-ubsan-*` ignores the exit code of `make usan` and `make usan32`.
 Because there are several issues which may take relatively long time to resolve.
 We'll fully enable it when we ensure `make usan` is ready for all commits and PRs.
 See [#983](https://github.com/lz4/lz4/pull/983) for details.
 ## C Compilers (`lz4-c-compilers`)
 - Our test doesn't use `gcc-4.5` due to installation issue of its package.  (`apt-get install gcc-4.5` fails on GH-Actions VM)
 - Currently, the following 32bit executable tests fail with all versions of `clang`.
  - `CC=clang-X CFLAGS='-O3' make V=1 -C tests clean test-lz4c32`
  - `CC=clang-X CFLAGS='-O3 -mx32' make V=1 -C tests clean test-lz4c32`
  - See [#991](https://github.com/lz4/lz4/issues/991) for details.
 - Currently, the following 32bit executable tests fail with `gcc-11`
  - `CC=gcc-11 CFLAGS='-O3' make V=1 -C tests clean test-lz4c32`
  - `CC=gcc-11 CFLAGS='-O3 -mx32' make V=1 -C tests clean test-lz4c32`
  - See [#991](https://github.com/lz4/lz4/issues/991) for details.
 ## cppcheck (`lz4-cppcheck`)
 This test script ignores the exit code of `make cppcheck`.
 Because this project doesn't 100% follow their recommendation.
 Also sometimes it reports false positives.
 # Notes
 - You can investigate various information at the right pane of GitHub
  Actions report page.
 | Item                      | Section in the right pane             |
 | ------------------------- | ------------------------------------- |
 | OS, VM                    | Set up job                            |
 | git repo, commit hash     | Run actions/checkout@v2               |
 | Version of tools          | Environment info                      |
 # Difference with `.travis.yml`
 The following tests are not included yet.
 - name: Compile OSS-Fuzz targets
 The following tests will not be included due to limitation of GH-Actions.
 - name: aarch64 real-hw tests
 - name: PPC64LE real-hw tests
 - name: IBM s390x real-hw tests
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@ -0,0 +1,800 @@
 # For details, see README.md in this directory.
 ###############################################################
 # C compilers
 #
 # - gcc
 # - clang
 #
 # Known Issue
 # - All test cases which described as 'fail' must be fixed and replaced with 'true'.
 #   - gcc-11 (x32, x86) : "../lib/lz4hc.c:148: LZ4HC_countBack: Assertion `(size_t)(match - mMin) < (1U<<31)' failed."
 #   - all clangs (x32, x86) : "../lib/lz4hc.c:282: int LZ4HC_InsertAndGetWiderMatch(...): Assertion `matchPtr >= lowPrefixPtr' failed."
 #
 name: lz4 CI
 on: [push, pull_request]
 permissions:
  contents: read
 jobs:
  lz4-c-compilers:
    name: CC=${{ matrix.cc }}, ${{ matrix.os }}
    strategy:
      fail-fast: false  # 'false' means Don't stop matrix workflows even if some matrix failed.
      matrix:
        include: [
          # You can access the following values via ${{ matrix.??? }}
          #
          #   pkgs         : apt-get package names.  It can include multiple package names which are delimited by space.
          #   cc           : C compiler executable.
          #   cxx          : C++ compiler executable for `make ctocpptest`.
          #   x32          : Set 'true' if compiler supports x32.  Otherwise, set 'false'.
          #                  Set 'fail' if it supports x32 but fails for now.  'fail' cases must be removed.
          #   x86          : Set 'true' if compiler supports x86 (-m32).  Otherwise, set 'false'.
          #                  Set 'fail' if it supports x86 but fails for now.  'fail' cases must be removed.
          #   cxxtest      : Set 'true' if it can be compiled as C++ code.  Otherwise, set 'false'.
          #   freestanding : Set 'true' if it can be compiled and execute freestanding code.  Otherwise, set 'false'.
          #                  Usually, it requires Linux, x86_64 and gcc/g++.
          #   os           : GitHub Actions YAML workflow label.  See https://github.com/actions/virtual-environments#available-environments
          # cc
          { pkgs: '',                                                   cc: cc,        cxx: c++,         x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'true',  os: ubuntu-latest, },
          # gcc
          { pkgs: '',                                                   cc: gcc,       cxx: g++,         x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'true',  os: ubuntu-latest, },
          { pkgs: 'gcc-12 g++-12 lib32gcc-12-dev libx32gcc-12-dev',     cc: gcc-12,    cxx: g++-12,      x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'true',  os: ubuntu-22.04,  },
          { pkgs: 'gcc-11 g++-11 lib32gcc-11-dev libx32gcc-11-dev',     cc: gcc-11,    cxx: g++-11,      x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'true',  os: ubuntu-22.04,  },
          { pkgs: 'gcc-10 g++-10 lib32gcc-10-dev libx32gcc-10-dev',     cc: gcc-10,    cxx: g++-10,      x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'true',  os: ubuntu-22.04,  },
          { pkgs: 'gcc-9 g++-9 lib32gcc-9-dev libx32gcc-9-dev',         cc: gcc-9,     cxx: g++-9,       x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'true',  os: ubuntu-22.04,  },
          { pkgs: 'gcc-8 g++-8 lib32gcc-8-dev libx32gcc-8-dev',         cc: gcc-8,     cxx: g++-8,       x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'true',  os: ubuntu-20.04,  },
          { pkgs: 'gcc-7 g++-7 lib32gcc-7-dev libx32gcc-7-dev',         cc: gcc-7,     cxx: g++-7,       x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'true',  os: ubuntu-20.04,  },
          { pkgs: 'gcc-6 g++-6 lib32gcc-6-dev libx32gcc-6-dev',         cc: gcc-6,     cxx: g++-6,       x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'true',  os: ubuntu-18.04,  },
          { pkgs: 'gcc-5 g++-5 lib32gcc-5-dev libx32gcc-5-dev',         cc: gcc-5,     cxx: g++-5,       x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'true',  os: ubuntu-18.04,  },
          { pkgs: 'gcc-4.8 g++-4.8 lib32gcc-4.8-dev libx32gcc-4.8-dev', cc: gcc-4.8,   cxx: g++-4.8,     x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'true',  os: ubuntu-18.04,  },
          # clang
          { pkgs: 'lib32gcc-11-dev libx32gcc-11-dev',                   cc: clang,     cxx: clang++,     x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'false', os: ubuntu-latest, },
          { pkgs: 'clang-14  lib32gcc-11-dev libx32gcc-11-dev',         cc: clang-14,  cxx: clang++-14,  x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'false', os: ubuntu-22.04,  },
          { pkgs: 'clang-13  lib32gcc-11-dev libx32gcc-11-dev',         cc: clang-13,  cxx: clang++-13,  x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'false', os: ubuntu-22.04,  },
          { pkgs: 'clang-12  lib32gcc-11-dev libx32gcc-11-dev',         cc: clang-12,  cxx: clang++-12,  x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'false', os: ubuntu-22.04,  },
          { pkgs: 'clang-11  lib32gcc-11-dev libx32gcc-11-dev',         cc: clang-11,  cxx: clang++-11,  x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'false', os: ubuntu-22.04,  },
          { pkgs: 'clang-10  lib32gcc-11-dev libx32gcc-11-dev',         cc: clang-10,  cxx: clang++-10,  x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'false', os: ubuntu-20.04,  },
          { pkgs: 'clang-9   lib32gcc-11-dev libx32gcc-11-dev',         cc: clang-9,   cxx: clang++-9,   x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'false', os: ubuntu-20.04,  },
          { pkgs: 'clang-8   lib32gcc-11-dev libx32gcc-11-dev',         cc: clang-8,   cxx: clang++-8,   x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'false', os: ubuntu-20.04,  },
          { pkgs: 'clang-7   lib32gcc-7-dev  libx32gcc-7-dev',          cc: clang-7,   cxx: clang++-7,   x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'false', os: ubuntu-20.04,  },
          { pkgs: 'clang-6.0 lib32gcc-11-dev libx32gcc-11-dev',         cc: clang-6.0, cxx: clang++-6.0, x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'false', os: ubuntu-20.04,  },
          { pkgs: 'clang-5.0 lib32gcc-11-dev libx32gcc-11-dev',         cc: clang-5.0, cxx: clang++-5.0, x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'false', os: ubuntu-18.04,  },
          { pkgs: 'clang-4.0 lib32gcc-11-dev libx32gcc-11-dev',         cc: clang-4.0, cxx: clang++-4.0, x32: 'true', x86: 'true', cxxtest: 'true',  freestanding: 'false', os: ubuntu-18.04,  },
          { pkgs: 'clang-3.9',                                          cc: clang-3.9, cxx: clang++-3.9, x32: 'fail', x86: 'fail', cxxtest: 'false', freestanding: 'false', os: ubuntu-18.04,  },
        ]
    runs-on: ${{ matrix.os }}
    env:                        # Set environment variables
      # We globally set CC and CXX to improve compatibility with .travis.yml
      CC: ${{ matrix.cc }}
      CXX: ${{ matrix.cxx }}
      FIXME__LZ4_CI_IGNORE : ' echo Error.  But we ignore it for now.'
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: apt-get install
      run: |
        sudo apt-get update
        sudo apt-get install gcc-multilib
        sudo apt-get install ${{ matrix.pkgs }}
    - name: Environment info
      run: |
        echo && type $CC && which $CC && $CC --version
        echo && type $CXX && which $CXX && $CXX --version
    - name: make
      if: always()
      run: make V=1
    - name: install test
      if: always()
      run: make clean; make V=1 -C tests test-install
    - name: make all
      if: always()
      run: make V=1 clean all
    - name: make c_standards (C90)
      if: always()
      run: make V=1 clean c_standards_c90
    - name: make c_standards (C11)
      if: always()
      run: make V=1 clean c_standards_c11
    - name: make c-to-c++
      if: always()
      run: make V=1 clean ctocpptest
    - name: make cxxtest
      if: ${{ matrix.cxxtest == 'true' }}
      run: make V=1 clean cxxtest
    - name: make test-freestanding
      if: ${{ matrix.freestanding == 'true' }}
      run: make V=1 clean test-freestanding
    - name: make -C programs default
      if: always()
      run: make V=1 -C programs clean default
    - name: make -C programs default -D_FORTIFY_SOURCE=2
      if: always()
      run: CFLAGS='-fPIC' LDFLAGS='-pie -fPIE -D_FORTIFY_SOURCE=2' make V=1 -C programs clean default
    - name: make -C tests test-lz4
      if: always()
      run: make clean; MOREFLAGS='-Werror' make -j V=1 -C tests test-lz4
    - name: make clangtest (clang only)
      if: ${{ startsWith( matrix.cc , 'clang' ) }}
      run: make V=1 clean clangtest
    - name: make -C tests test MOREFLAGS='-mx32'
      if: ${{ matrix.x32 == 'true' }}
      run: make clean; LDFLAGS='-Wl,--verbose' MOREFLAGS='-mx32' make -j V=1 -C tests test
    - name: make -C tests test-lz4c32
      if: ${{ matrix.x86 == 'true' }}
      run: LDFLAGS='-Wl,--verbose' MOREFLAGS='-Werror' make V=1 -C tests clean test-lz4c32
    ###############################################################
    #                                                             #
    #      Remove this block when we stabilize the tests.         #
    #                                                             #
    - name: make -C tests test MOREFLAGS='-mx32' || echo Ignore failure for now.
      if: ${{ matrix.x32 == 'fail' }}
      run: make clean; LDFLAGS='-Wl,--verbose' MOREFLAGS='-mx32' make -j V=1 -C tests test || $FIXME__LZ4_CI_IGNORE
    - name: make -C tests test-lz4c32 || echo Ignore failure for now.
      if: ${{ matrix.x86 == 'fail' }}
      run: make clean; LDFLAGS='-Wl,--verbose' MOREFLAGS='-Werror' make V=1 -C tests test-lz4c32 || $FIXME__LZ4_CI_IGNORE
    #                                                             #
    ###############################################################
 ###############################################################
 # LZ4 self tests
 #
 # - Benchmark
 # - Fuzzer
 # - LZ4 Frame
 # - LZ4 versions
 # - Custom LZ4_DISTANCE_MAX
 #
  lz4-benchmark:
    name: Benchmark
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: apt-get install
      run: |
        sudo apt-get update
        sudo apt-get install gcc-multilib
    - name: benchmark (-C tests test-lz4)
      run: make -j V=1 -C tests test-lz4
    - name: benchmark (-C tests test-lz4c)
      run: make -j V=1 -C tests test-lz4c
    - name: benchmark (-C tests test-lz4c32)
      run: make V=1 -C tests test-lz4c32
    - name: benchmark (-C tests test-fullbench)
      run: make V=1 -C tests test-fullbench
    - name: benchmark (-C tests test-fullbench32)
      run: make V=1 -C tests test-fullbench32
  lz4-fuzzer:
    name: Fuzzer test
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: apt-get install
      run: |
        sudo apt-get update
        sudo apt-get install gcc-multilib
    - name: setup
      run: sudo sysctl -w vm.mmap_min_addr=4096
    - name: fuzzer
      run: make V=1 -C tests test-fuzzer
    - name: fuzzer32
      run: make V=1 -C tests test-fuzzer32
  lz4-standard-makefile-variables:
    name: LZ4 Makefile - support for standard variables
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: make standard_variables
      run: make V=1 standard_variables
  lz4-versions:
    name: LZ4 versions test
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: apt-get install
      run: |
        sudo apt-get update
        sudo apt-get install gcc-multilib
    - name: make -C tests versionsTest
      run: make V=1 -C tests versionsTest
  lz4-abi:
    name: LZ4 inter-versions ABI test
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: apt-get install
      run: |
        sudo apt-get update
        sudo apt-get install gcc-multilib
    - name: make -C tests abiTests
      run: make V=1 -C tests abiTests
  lz4-frame:
    name: LZ4 frame test
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: apt-get install
      run: |
        sudo apt-get update
        sudo apt-get install gcc-multilib
    - name: LZ4 frame test
      run: make V=1 -C tests test-frametest
    - name: LZ4 frame test (32-bit)
      run: make V=1 -C tests test-frametest32
  lz4-memory-usage:
    name: test different values of LZ4_MEMORY_USAGE
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: LZ4_MEMORY_USAGE
      run: make V=1 -C tests test-compile-with-lz4-memory-usage
  # Custom LZ4_DISTANCE_MAX ; lz4-wlib (CLI linked to dynamic library); LZ4_USER_MEMORY_FUNCTIONS
  lz4-custom-distance:
    name: Custom LZ4_DISTANCE_MAX
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: custom LZ4_DISTANCE_MAX; test LZ4_USER_MEMORY_FUNCTIONS
      run: |
        MOREFLAGS='-DLZ4_DISTANCE_MAX=8000' make V=1 check
        make V=1 clean
        make V=1 -C programs lz4-wlib
        make V=1 clean
        make V=1 -C tests fullbench-wmalloc  # test LZ4_USER_MEMORY_FUNCTIONS
        make V=1 clean
        CC="c++ -Wno-deprecated" make V=1 -C tests fullbench-wmalloc  # stricter function signature check
  # test block device compression #1086
  lz4cli-block-device:
    name: Test lz4 compression on a block device
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: create a block device, compress it with lz4 # alternative : blindly use /dev/loop0, seems to always exist
      run: |
        make lz4
        dd if=/dev/zero of=full0.img bs=2M count=1
        BLOCK_DEVICE=$(sudo losetup --show -fP full0.img)
        sudo chmod 666 $BLOCK_DEVICE
        ./lz4 -v $BLOCK_DEVICE -c > /dev/null
        sudo losetup -d $BLOCK_DEVICE
        rm full0.img
 ###############################################################
 # Check tools
 #
 # - cppcheck
 # - scan-build
 # - valgrind
 # - ubsan
 # - asan
 # - unicode-lint
 # - build examples
 #
  lz4-cppcheck:
    name: make cppcheck
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: apt-get install
      run: |
        sudo apt-get update
        sudo apt-get install cppcheck
    - name: Environment info
      run: echo && type cppcheck && which cppcheck && cppcheck --version
    - name: cppcheck
      # This test script ignores the exit code of cppcheck.
      # See known issues in README.md.
      run: make V=1 clean cppcheck || echo There are some cppcheck reports but we ignore it.
  lz4-scan-build:
    name: make staticAnalyze
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: apt-get install
      run: |
        sudo apt-get update
        sudo apt-get install clang-tools
    - name: Environment info
      run: |
        echo && type gcc && which gcc && gcc --version
        echo && type clang && which clang && clang --version
        echo && type scan-build && which scan-build               # scan-build doesn't have any --version equivalent option
        echo && type make && which make && make -v
        echo && cat /proc/cpuinfo || echo /proc/cpuinfo is not present
    - name: make staticAnalyze
      run: make V=1 clean staticAnalyze
  lz4-valgrind:
    name: valgrind
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: apt-get install
      run: |
        sudo apt-get update
        sudo apt-get install valgrind
    - name: Environment info
      run: |
        echo && type cc && which cc && cc --version
        echo && type valgrind && which valgrind && valgrind --version
    - name: valgrind
      run: make V=1 -C tests test-mem
  lz4-ubsan-x64:
    name: Linux x64 ubsan
    runs-on: ubuntu-latest
    env:                        # Set environment variables
      FIXME__LZ4_CI_IGNORE : ' echo Error.  But we ignore it for now.'
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: ubsan
      #########################################################
      # For now, we ignore the exit code of `make usan`.
      # See "Known issues / lz4-ubsan-x64" in README.md
      # When we'll resolve this issue, remove "|| $FIXME__LZ4_CI_IGNORE"
      #########################################################
      run: make V=1 clean usan MOREFLAGS='-Wcomma -Werror' || $FIXME__LZ4_CI_IGNORE
  lz4-ubsan-x86:
    name: Linux x86 ubsan
    runs-on: ubuntu-latest
    env:                        # Set environment variables
      FIXME__LZ4_CI_IGNORE : ' echo Error.  But we ignore it for now.'
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: apt-get install
      run: |
        sudo apt-get update
        sudo apt-get install gcc-multilib
        sudo apt-get install lib32gcc-11-dev
    - name: ubsan32
      #########################################################
      # For now, we ignore the exit code of `make usan32`.
      # See "Known issues / lz4-ubsaan-x86" in README.md.
      # When we'll resolve this issue, remove "|| $FIXME__LZ4_CI_IGNORE"
      #########################################################
      run: CC=clang make V=1 clean usan32 MOREFLAGS='-Wcomma -Werror' || $FIXME__LZ4_CI_IGNORE
  lz4-asan-x64:
    name: Linux x64 ASAN
    runs-on: ubuntu-latest
    env:                        # Set environment variables
      FIXME__LZ4_CI_IGNORE : ' echo Error.  But we ignore it for now.'
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: setup
      run: sudo sysctl -w vm.mmap_min_addr=4096
    - name: frametest
      run: CC=clang MOREFLAGS=-fsanitize=address make V=1 -C tests clean test-frametest
    - name: fuzzer
      run: CC=clang MOREFLAGS=-fsanitize=address make V=1 -C tests clean test-fuzzer
  unicode-lint:
    name: lint unicode in ./lib/, ./tests/ and ./programs/
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: unicode lint
      run: bash ./tests/unicode_lint.sh
  lz4-examples:
    name: make examples
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: apt-get install
      run: |
        sudo apt-get update
    - name: Environment info
      run: |
        echo && type cc && which cc && cc --version
        echo && type c++ && which c++ && c++ --version
    - name: examples
      run: make V=1 clean examples
    - name: examples (compile as C++ code)
      run: make V=1 -C examples clean cxxtest
  # lasts ~20mn
  oss-fuzz:
    runs-on: ubuntu-latest
    strategy:
      fail-fast: false
      matrix:
        sanitizer: [address, undefined, memory]
    steps:
    - name: Build Fuzzers (${{ matrix.sanitizer }})
      id: build
      uses: google/oss-fuzz/infra/cifuzz/actions/build_fuzzers@master
      with:
        oss-fuzz-project-name: 'lz4'
        dry-run: false
        sanitizer: ${{ matrix.sanitizer }}
    - name: Run Fuzzers (${{ matrix.sanitizer }})
      uses: google/oss-fuzz/infra/cifuzz/actions/run_fuzzers@master
      with:
        oss-fuzz-project-name: 'lz4'
        fuzz-seconds: 600
        dry-run: false
        sanitizer: ${{ matrix.sanitizer }}
    - name: Upload Crash
      uses: actions/upload-artifact@v1
      if: failure() && steps.build.outcome == 'success'
      with:
        name: ${{ matrix.sanitizer }}-artifacts
        path: ./out/artifacts
 ###############################################################
 # Platforms
 #
 # - QEMU (ARM, ARM64, PPC, PPC64LE, S390X)
 # - macOS
 #
  # QEMU
  # All tests use QEMU (static) and gcc cross compiler.
  #
  # note:
  #   We don't employ completely matrix method which provides `MOREFLAGS`
  #   etc in the matrix.  Because some platform may need its special
  #   compiler options and test.
  #   For example, xxHash already has tests for scalar and SIMD version of
  #   it.  But compiler options are quite different between platforms.
  #
  #   So, please keep them simple and independent.
  #
  lz4-qemu-platforms:
    name: QEMU ${{ matrix.type }}
    strategy:
      fail-fast: false  # 'false' means Don't stop matrix workflows even if some matrix instance failed.
      matrix:
        include: [
          # You can access the following values via ${{ matrix.??? }}
          #   type : Architecture type for `if:` statement.
          #   pkgs : apt-get package names.  You can include multiple packages which are delimited by space.
          #   xcc  : gcc cross C compiler executable.
          #   xemu : QEMU static emulator executable.
          #   os   : GitHub Actions YAML workflow label.  See https://github.com/actions/virtual-environments#available-environments
          { type: ARM,      pkgs: 'qemu-system-arm   gcc-arm-linux-gnueabi',     xcc: arm-linux-gnueabi-gcc,     xemu: qemu-arm-static,     os: ubuntu-latest, },
          { type: ARM64,    pkgs: 'qemu-system-arm   gcc-aarch64-linux-gnu',     xcc: aarch64-linux-gnu-gcc,     xemu: qemu-aarch64-static, os: ubuntu-latest, },
          { type: PPC,      pkgs: 'qemu-system-ppc   gcc-powerpc-linux-gnu',     xcc: powerpc-linux-gnu-gcc,     xemu: qemu-ppc-static,     os: ubuntu-latest, },
          { type: PPC64LE,  pkgs: 'qemu-system-ppc   gcc-powerpc64le-linux-gnu', xcc: powerpc64le-linux-gnu-gcc, xemu: qemu-ppc64le-static, os: ubuntu-latest, },
          { type: S390X,    pkgs: 'qemu-system-s390x gcc-s390x-linux-gnu',       xcc: s390x-linux-gnu-gcc,       xemu: qemu-s390x-static,   os: ubuntu-latest, },
        ]
    runs-on: ${{ matrix.os }}
    env:                        # Set environment variables
      XCC: ${{ matrix.xcc }}
      XEMU: ${{ matrix.xemu }}
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: apt-get install
      run: |
        sudo apt-get update
        sudo apt-get install gcc-multilib
        sudo apt-get install qemu-utils qemu-user-static
        sudo apt-get install ${{ matrix.pkgs }}
    - name: Environment info
      run: |
        echo && type $XCC && which $XCC && $XCC --version
        echo && $XCC -v                       # Show built-in specs
        echo && type $XEMU && which $XEMU && $XEMU --version
    - name: ARM64
      if: ${{ matrix.type == 'ARM64' }}
      run: make V=1 platformTest CC=$XCC QEMU_SYS=$XEMU
    - name: ARM
      if: ${{ matrix.type == 'ARM' }}
      run: make V=1 platformTest CC=$XCC QEMU_SYS=$XEMU
    - name: PPC
      if: ${{ matrix.type == 'PPC' }}
      run: make V=1 platformTest CC=$XCC QEMU_SYS=$XEMU
    - name: PPC64LE
      if: ${{ matrix.type == 'PPC64LE' }}
      run: make V=1 platformTest CC=$XCC QEMU_SYS=$XEMU MOREFLAGS=-m64
    - name: S390X
      if: ${{ matrix.type == 'S390X' }}
      run: make V=1 platformTest CC=$XCC QEMU_SYS=$XEMU
  # macOS
  lz4-platform-macos-latest:
    name: macOS
    runs-on: macos-latest
    steps:
    - uses: actions/checkout@v2
    - name: Environment info
      run: |
        echo && type cc && which cc && cc --version
        echo && type make && which make && make -v
        echo && sysctl -a | grep machdep.cpu   # cpuinfo
    - name: make default
      run: CFLAGS="-Werror" make V=1 clean default
    - name: make test
      run: make clean; make -j V=1 test MOREFLAGS='-Werror -Wconversion -Wno-sign-conversion'
    - name: Ensure `make test` doesn't depend on the status of the console
      # see issue #990 for detailed explanations
      run: make -j test > /dev/null
 ###############################################################
 # Build systems
 #
 # - make
 # - cmake
 # - meson
 #
  # make
  lz4-build-make:
    name: make
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: Environment info
      run: |
        echo && type cc && which cc && cc --version
        echo && type make && which make && make -v
    - name: make
      run: make V=1
  lz4-build-make-travis-install:
    name: make travis-install
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: travis-install
      run: make V=1 clean travis-install
    - name: travis-install result
      run: |
        echo && echo Installed files
        ( cd ~/install_test_dir; find .; )
  # cmake
  lz4-build-cmake:
    name: cmake
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: Environment info
      run: |
        echo && type cmake && which cmake && cmake --version
        echo && type make && which make && make -v
    - name: cmake
      run: |
        cd build/cmake
        mkdir build
        cd build
        cmake ..
        CFLAGS=-Werror make VERBOSE=1
  # Invoke cmake via Makefile
  lz4-build-make-cmake:
    name: make cmake
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - name: make cmake
      # V=1 for lz4 Makefile, VERBOSE=1 for cmake Makefile.
      run: make V=1 VERBOSE=1 clean cmake
  # Meson
  lz4-build-meson:
    name: Meson + Ninja
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2 # https://github.com/actions/checkout
    - uses: actions/setup-python@v2 # https://github.com/actions/setup-python
      with:
        python-version: '3.x'
    - name: Install
      run: |
        sudo apt-get update
        sudo apt-get install tree ninja-build
        python -m pip install --upgrade pip
        pip3 install --user meson
    - name: Environment info
      run: |
        echo && type clang && which clang && clang --version
        echo && type python && which python && python --version
        echo && type meson && which meson && meson --version
    - name: meson
      # 'run: >' replaces all newlines in the following block with spaces
      run: >
        meson setup
        --buildtype=debug
        -Db_lundef=false
        -Dauto_features=enabled
        -Dprograms=true
        -Dcontrib=true
        -Dtests=true
        -Dexamples=true
        contrib/meson build
    - name: staging
      run: |
        cd build
        DESTDIR=./staging ninja install
        tree ./staging
 ############################################################
 # Check git tag for LZ4 releases
 #
  lz4-check-tag:
    name: git version tag checking for release
    runs-on: ubuntu-latest
    steps:
    - uses: actions/checkout@v2
    - name: make -C tests checkTag
      if: startsWith(github.ref, 'refs/tags/v')   # If git tag name starts with 'v'
      run: |
        echo "tag=${GITHUB_REF#refs/*/}"
        make -C tests checkTag
        tests/checkTag ${GITHUB_REF#refs/*/}
 ############################################################
 # Gather CI environment information.
 #
  lz4-env-info:
    name: GH-Actions Virtual Env Info (${{ matrix.os }})
    strategy:
      matrix:
        include: [
          { os: ubuntu-latest,  }, # https://github.com/actions/virtual-environments/
          { os: ubuntu-22.04,   }, # https://github.com/actions/virtual-environments/blob/main/images/linux/Ubuntu2204-Readme.md
          { os: ubuntu-20.04,   }, # https://github.com/actions/virtual-environments/blob/main/images/linux/Ubuntu2004-Readme.md
          { os: ubuntu-18.04,   }, # https://github.com/actions/virtual-environments/blob/main/images/linux/Ubuntu1804-Readme.md
        ]
    runs-on: ${{ matrix.os }}
    steps:
    - uses: actions/checkout@v2
    - name: init
      run: |
        sudo apt-get update
    - name: cc --version
      run: echo && type cc && which cc && cc --version
    - name: gcc --version
      run: echo && type gcc && which gcc && gcc --version
    - name: clang --version
      run: echo && type clang && which clang && clang --version
    - name: make -v
      run: echo && type make && which make && make -v
    - name: g++ --version
      run: echo && type g++ && which g++ && g++ --version
    - name: git --version
      run: echo && type git && which git && git --version
    - name: gcc packages (apt-cache)
      run: apt-cache search gcc | grep "^gcc-[0-9\.]* " | sort
    - name: lib32gcc packages for i386 (apt-cache)
      run: apt-cache search lib32gcc | grep "^lib32gcc-" | sort
    - name: libx32gcc packages for x32 (apt-cache)
      run: apt-cache search libx32gcc | grep "^libx32gcc-" | sort
    - name: gcc multilib packages (apt-cache)
      run: apt-cache search multilib | grep "gcc-" | sort
    - name: clang packages (apt-cache)
      run: apt-cache search clang | grep "^clang-[0-9\.]* " | sort
    - name: QEMU packages (apt-cache)
      run: apt-cache search qemu | grep "^qemu-system-.*QEMU full system" | sort
--- a/.gitignore
+++ b/.gitignore
@ -0,0 +1,43 @@
 # Object files
 *.o
 *.ko
 # Libraries
 *.lib
 *.a
 # Shared objects (inc. Windows DLLs)
 *.dll
 *.so
 *.so.*
 *.dylib
 *.dSYM   # apple
 # Executables
 *.exe
 *.out
 *.app
 lz4
 # IDE / editors files
 .clang_complete
 _codelite/
 _codelite_lz4/
 bin/
 *.zip
 *.swp
 # analyzers
 infer-out
 # Mac
 .DS_Store
 *.dSYM
 # Windows / Msys
 nul
 ld.exe*
 # test artifacts
 *.lz4
 tmp*
--- a/.travis.yml
+++ b/.travis.yml
@ -0,0 +1,42 @@
 language: c
 matrix:
  fast_finish: true
  include:
    - name: aarch64 real-hw tests
      arch: arm64
      script:
        - make test
    - name: PPC64LE real-hw tests
      arch: ppc64le
      script:
        - make test
    - name: IBM s390x real-hw tests
      arch: s390x
      script:
        - make test
    # tag-specific test
    - name: tag build
      if: tag =~ ^v[0-9]\.[0-9]
      os: linux
      script:
        - make -C tests checkTag
        - tests/checkTag "$TRAVIS_BRANCH"
    # oss-fuzz compilation test
    - name: Compile OSS-Fuzz targets
      script:
        - ./ossfuzz/travisoss.sh
    # Unicode lint
    # See https://github.com/lz4/lz4/issues/1018
    - name: Run Unicode lint
      script:
        - ./tests/unicode_lint.sh
  allow_failures:
    - env: ALLOW_FAILURES=true
--- a/16
+++ b/16
@ -0,0 +1,16 @@
 Installation
 =============
 ```
 make
 make install     # this command may require root access
 ```
 LZ4's `Makefile` supports standard [Makefile conventions],
 including [staged installs], [redirection], or [command redefinition].
 It is compatible with parallel builds (`-j#`).
 [Makefile conventions]: https://www.gnu.org/prep/standards/html_node/Makefile-Conventions.html
 [staged installs]: https://www.gnu.org/prep/standards/html_node/DESTDIR.html
 [redirection]: https://www.gnu.org/prep/standards/html_node/Directory-Variables.html
 [command redefinition]: https://www.gnu.org/prep/standards/html_node/Utilities-in-Makefiles.html
--- a/12
+++ b/12
@ -0,0 +1,12 @@
 This repository uses 2 different licenses :
 - all files in the `lib` directory use a BSD 2-Clause license
 - all other files use a GPLv2 license, unless explicitly stated otherwise
 Relevant license is reminded at the top of each source file,
 and with presence of COPYING or LICENSE file in associated directories.
 This model is selected to emphasize that
 files in the `lib` directory are designed to be included into 3rd party applications,
 while all other files, in `programs`, `tests` or `examples`,
 are intended to be used "as is", as part of their intended scenarios,
 with no intention to support 3rd party integration use cases.
--- a/279
+++ b/279
@ -0,0 +1,279 @@
 # ################################################################
 # LZ4 - Makefile
 # Copyright (C) Yann Collet 2011-2020
 # All rights reserved.
 #
 # BSD license
 # 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 HOLDER 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.
 #
 # You can contact the author at :
 #  - LZ4 source repository : https://github.com/lz4/lz4
 #  - LZ4 forum froup : https://groups.google.com/forum/#!forum/lz4c
 # ################################################################
 LZ4DIR  = lib
 PRGDIR  = programs
 TESTDIR = tests
 EXDIR   = examples
 FUZZDIR = ossfuzz
 include Makefile.inc
 .PHONY: default
 default: lib-release lz4-release
 # silent mode by default; verbose can be triggered by V=1 or VERBOSE=1
 $(V)$(VERBOSE).SILENT:
 .PHONY: all
 all: allmost examples manuals build_tests
 .PHONY: allmost
 allmost: lib lz4
 .PHONY: lib lib-release liblz4.a
 lib: liblz4.a
 lib lib-release liblz4.a:
 	$(MAKE) -C $(LZ4DIR) $@
 .PHONY: lz4 lz4-release
 lz4 : liblz4.a
 lz4-release : lib-release
 lz4 lz4-release :
 	$(MAKE) -C $(PRGDIR) $@
 	cp $(PRGDIR)/lz4$(EXT) .
 .PHONY: examples
 examples: liblz4.a
 	$(MAKE) -C $(EXDIR) all
 .PHONY: manuals
 manuals:
 	$(MAKE) -C contrib/gen_manual $@
 .PHONY: build_tests
 build_tests:
 	$(MAKE) -C $(TESTDIR) all
 .PHONY: clean
 clean:
 	$(MAKE) -C $(LZ4DIR) $@ > $(VOID)
 	$(MAKE) -C $(PRGDIR) $@ > $(VOID)
 	$(MAKE) -C $(TESTDIR) $@ > $(VOID)
 	$(MAKE) -C $(EXDIR) $@ > $(VOID)
 	$(MAKE) -C $(FUZZDIR) $@ > $(VOID)
 	$(MAKE) -C contrib/gen_manual $@ > $(VOID)
 	$(RM) lz4$(EXT)
 	$(RM) -r $(CMAKE_BUILD_DIR)
 	@echo Cleaning completed
 #-----------------------------------------------------------------------------
 # make install is validated only for Posix environments
 #-----------------------------------------------------------------------------
 ifeq ($(POSIX_ENV),Yes)
 HOST_OS = POSIX
 .PHONY: install uninstall
 install uninstall:
 	$(MAKE) -C $(LZ4DIR) $@
 	$(MAKE) -C $(PRGDIR) $@
 .PHONY: travis-install
 travis-install:
 	$(MAKE) -j1 install DESTDIR=~/install_test_dir
 endif   # POSIX_ENV
 CMAKE ?= cmake
 CMAKE_BUILD_DIR ?= build/cmake/build
 ifneq (,$(filter MSYS%,$(shell $(UNAME))))
 HOST_OS = MSYS
 CMAKE_PARAMS = -G"MSYS Makefiles"
 endif
 .PHONY: cmake
 cmake:
 	mkdir -p $(CMAKE_BUILD_DIR)
 	cd $(CMAKE_BUILD_DIR); $(CMAKE) $(CMAKE_PARAMS) ..; $(CMAKE) --build .
 #------------------------------------------------------------------------
 # make tests validated only for MSYS and Posix environments
 #------------------------------------------------------------------------
 ifneq (,$(filter $(HOST_OS),MSYS POSIX))
 .PHONY: list
 list:
 	$(MAKE) -pRrq -f $(lastword $(MAKEFILE_LIST)) : 2>/dev/null | awk -v RS= -F: '/^# File/,/^# Finished Make data base/ {if ($$1 !~ "^[#.]") {print $$1}}' | sort | egrep -v -e '^[^[:alnum:]]' -e '^$@$$' | xargs
 .PHONY: check
 check:
 	$(MAKE) -C $(TESTDIR) test-lz4-essentials
 .PHONY: test
 test:
 	$(MAKE) -C $(TESTDIR) $@
 	$(MAKE) -C $(EXDIR) $@
 .PHONY: clangtest
 clangtest: CFLAGS += -Werror -Wconversion -Wno-sign-conversion
 clangtest: CC = clang
 clangtest: clean
 	$(CC) -v
 	$(MAKE) -C $(LZ4DIR)  all CC=$(CC)
 	$(MAKE) -C $(PRGDIR)  all CC=$(CC)
 	$(MAKE) -C $(TESTDIR) all CC=$(CC)
 .PHONY: clangtest-native
 clangtest-native: CFLAGS = -O3 -Werror -Wconversion -Wno-sign-conversion
 clangtest-native: clean
 	clang -v
 	$(MAKE) -C $(LZ4DIR)  all    CC=clang
 	$(MAKE) -C $(PRGDIR)  native CC=clang
 	$(MAKE) -C $(TESTDIR) native CC=clang
 .PHONY: usan
 usan: CC      = clang
 usan: CFLAGS  = -O3 -g -fsanitize=undefined -fno-sanitize-recover=undefined -fsanitize-recover=pointer-overflow
 usan: LDFLAGS = $(CFLAGS)
 usan: clean
 	CC=$(CC) CFLAGS='$(CFLAGS)' LDFLAGS='$(LDFLAGS)' $(MAKE) test FUZZER_TIME="-T30s" NB_LOOPS=-i1
 .PHONY: usan32
 usan32: CFLAGS = -m32 -O3 -g -fsanitize=undefined
 usan32: LDFLAGS = $(CFLAGS)
 usan32: clean
 	$(MAKE) test FUZZER_TIME="-T30s" NB_LOOPS=-i1
 SCANBUILD ?= scan-build
 SCANBUILD_FLAGS += --status-bugs -v --force-analyze-debug-code
 .PHONY: staticAnalyze
 staticAnalyze: clean
 	CPPFLAGS=-DLZ4_DEBUG=1 CFLAGS=-g $(SCANBUILD) $(SCANBUILD_FLAGS) $(MAKE) all V=1 DEBUGLEVEL=1
 .PHONY: cppcheck
 cppcheck:
 	cppcheck . --force --enable=warning,portability,performance,style --error-exitcode=1 > /dev/null
 .PHONY: platformTest
 platformTest: clean
 	@echo "\n ---- test lz4 with $(CC) compiler ----"
 	$(CC) -v
 	CFLAGS="-O3 -Werror"         $(MAKE) -C $(LZ4DIR) all
 	CFLAGS="-O3 -Werror -static" $(MAKE) -C $(PRGDIR) all
 	CFLAGS="-O3 -Werror -static" $(MAKE) -C $(TESTDIR) all
 	$(MAKE) -C $(TESTDIR) test-platform
 .PHONY: versionsTest
 versionsTest: clean
 	$(MAKE) -C $(TESTDIR) $@
 .PHONY: test-freestanding
 test-freestanding:
 	$(MAKE) -C $(TESTDIR) clean $@
 .PHONY: cxxtest cxx32test
 cxxtest cxx32test: CC := "$(CXX) -Wno-deprecated"
 cxxtest cxx32test: CFLAGS = -O3 -Wall -Wextra -Wundef -Wshadow -Wcast-align -Werror
 cxx32test: CFLAGS += -m32
 cxxtest cxx32test: clean
 	$(CXX) -v
 	CC=$(CC) $(MAKE) -C $(LZ4DIR)  all CFLAGS="$(CFLAGS)"
 	CC=$(CC) $(MAKE) -C $(PRGDIR)  all CFLAGS="$(CFLAGS)"
 	CC=$(CC) $(MAKE) -C $(TESTDIR) all CFLAGS="$(CFLAGS)"
 .PHONY: cxx17build
 cxx17build : CC = "$(CXX) -Wno-deprecated"
 cxx17build : CFLAGS = -std=c++17 -Wall -Wextra -Wundef -Wshadow -Wcast-align -Werror -pedantic
 cxx17build : clean
 	$(CXX) -v
 	CC=$(CC) $(MAKE) -C $(LZ4DIR)  all CFLAGS="$(CFLAGS)"
 	CC=$(CC) $(MAKE) -C $(PRGDIR)  all CFLAGS="$(CFLAGS)"
 	CC=$(CC) $(MAKE) -C $(TESTDIR) all CFLAGS="$(CFLAGS)"
 .PHONY: ctocpptest
 ctocpptest: LIBCC="$(CC)"
 ctocpptest: TESTCC="$(CXX)"
 ctocpptest: CFLAGS=
 ctocpptest: clean
 	CC=$(LIBCC)  $(MAKE) -C $(LZ4DIR)  CFLAGS="$(CFLAGS)" all
 	CC=$(LIBCC)  $(MAKE) -C $(TESTDIR) CFLAGS="$(CFLAGS)" lz4.o lz4hc.o lz4frame.o
 	CC=$(TESTCC) $(MAKE) -C $(TESTDIR) CFLAGS="$(CFLAGS)" all
 .PHONY: c_standards
 c_standards: clean c_standards_c11 c_standards_c99 c_standards_c90
 .PHONY: c_standards_c90
 c_standards_c90: clean
 	$(MAKE) clean; CFLAGS="-std=c90   -Werror -pedantic -Wno-long-long -Wno-variadic-macros" $(MAKE) allmost
 	$(MAKE) clean; CFLAGS="-std=gnu90 -Werror -pedantic -Wno-long-long -Wno-variadic-macros" $(MAKE) allmost
 .PHONY: c_standards_c99
 c_standards_c99: clean
 	$(MAKE) clean; CFLAGS="-std=c99   -Werror -pedantic" $(MAKE) all
 	$(MAKE) clean; CFLAGS="-std=gnu99 -Werror -pedantic" $(MAKE) all
 .PHONY: c_standards_c11
 c_standards_c11: clean
 	$(MAKE) clean; CFLAGS="-std=c11 -Werror" $(MAKE) all
 # The following test ensures that standard Makefile variables set through environment
 # are correctly transmitted at compilation stage.
 # This test is meant to detect issues like https://github.com/lz4/lz4/issues/958
 .PHONY: standard_variables
 standard_variables: clean
 	@echo =================
 	@echo Check support of Makefile Standard variables through environment
 	@echo note : this test requires V=1 to work properly
 	@echo =================
 	CC="cc -DCC_TEST" \
 	CFLAGS=-DCFLAGS_TEST \
 	CPPFLAGS=-DCPPFLAGS_TEST \
 	LDFLAGS=-DLDFLAGS_TEST \
 	LDLIBS=-DLDLIBS_TEST \
 	$(MAKE) V=1 > tmpsv
 	# Note: just checking the presence of custom flags
 	# would not detect situations where custom flags are
 	# supported in some part of the Makefile, and missed in others.
 	# So the test checks if they are present the _right nb of times_.
 	# However, checking static quantities makes this test brittle,
 	# because quantities (7, 2 and 1) can still evolve in future,
 	# for example when source directories or Makefile evolve.
 	if [ $$(grep CC_TEST tmpsv | wc -l) -ne 7 ]; then \
 		echo "CC environment variable missed" && False; fi
 	if [ $$(grep CFLAGS_TEST tmpsv | wc -l) -ne 7 ]; then \
 		echo "CFLAGS environment variable missed" && False; fi
 	if [ $$(grep CPPFLAGS_TEST tmpsv | wc -l) -ne 7 ]; then \
 		echo "CPPFLAGS environment variable missed" && False; fi
 	if [ $$(grep LDFLAGS_TEST tmpsv | wc -l) -ne 2 ]; then \
 		echo "LDFLAGS environment variable missed" && False; fi
 	if [ $$(grep LDLIBS_TEST tmpsv | wc -l) -ne 1 ]; then \
 		echo "LDLIBS environment variable missed" && False; fi
 	@echo =================
 	@echo all custom variables detected
 	@echo =================
 	$(RM) tmpsv
 endif   # MSYS POSIX
--- a/Makefile.inc
+++ b/Makefile.inc
@ -0,0 +1,111 @@
 # ################################################################
 # LZ4 - Makefile common definitions
 # Copyright (C) Yann Collet 2020
 # All rights reserved.
 #
 # BSD license
 # 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 HOLDER 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.
 #
 # You can contact the author at :
 #  - LZ4 source repository : https://github.com/lz4/lz4
 #  - LZ4 forum froup : https://groups.google.com/forum/#!forum/lz4c
 # ################################################################
 UNAME ?= uname
 TARGET_OS ?= $(shell $(UNAME))
 ifeq ($(TARGET_OS),)
  TARGET_OS ?= $(OS)
 endif
 ifneq (,$(filter Windows%,$(TARGET_OS)))
 LIBLZ4 = liblz4-$(LIBVER_MAJOR)
 LIBLZ4_EXP = liblz4.lib
 WINBASED   = yes
 else
 LIBLZ4_EXP = liblz4.dll.a
  ifneq (,$(filter MINGW%,$(TARGET_OS)))
 LIBLZ4     = liblz4
 WINBASED   = yes
  else
    ifneq (,$(filter MSYS%,$(TARGET_OS)))
 LIBLZ4     = msys-lz4-$(LIBVER_MAJOR)
 WINBASED   = yes
    else
      ifneq (,$(filter CYGWIN%,$(TARGET_OS)))
 LIBLZ4     = cyglz4-$(LIBVER_MAJOR)
 WINBASED   = yes
      else
 LIBLZ4     = liblz4.$(SHARED_EXT_VER)
 WINBASED   = no
 EXT        =
      endif
    endif
  endif
 endif
 ifeq ($(WINBASED),yes)
 EXT        = .exe
 WINDRES    = windres
 endif
 #determine if dev/nul based on host environment
 ifneq (,$(filter MINGW% MSYS% CYGWIN%,$(shell $(UNAME))))
 VOID := /dev/null
 else
  ifneq (,$(filter Windows%,$(OS)))
 VOID := nul
  else
 VOID  := /dev/null
  endif
 endif
 ifneq (,$(filter Linux Darwin GNU/kFreeBSD GNU OpenBSD FreeBSD NetBSD DragonFly SunOS Haiku MidnightBSD MINGW% CYGWIN% MSYS%,$(shell $(UNAME))))
 POSIX_ENV = Yes
 else
 POSIX_ENV = No
 endif
 # Avoid symlinks when targeting Windows or building on a Windows host
 ifeq ($(WINBASED),yes)
 LN_SF = cp -p
 else
  ifneq (,$(filter MINGW% MSYS% CYGWIN%,$(shell $(UNAME))))
 LN_SF = cp -p
  else
    ifneq (,$(filter Windows%,$(OS)))
 LN_SF = cp -p
    else
 LN_SF  = ln -sf
    endif
  endif
 endif
 ifneq (,$(filter $(shell $(UNAME)),SunOS))
 INSTALL ?= ginstall
 else
 INSTALL ?= install
 endif
 INSTALL_PROGRAM ?= $(INSTALL) -m 755
 INSTALL_DATA    ?= $(INSTALL) -m 644
 INSTALL_DIR     ?= $(INSTALL) -d -m 755
--- a/341
+++ b/341
@ -0,0 +1,341 @@
 v1.9.4
 perf : faster decoding speed (~+20%) on aarch64 platforms
 perf : faster decoding speed (~+70%) for -BD4 setting in CLI
 api  : new function `LZ4_decompress_safe_partial_usingDict()` by @yawqi
 api  : lz4frame: ability to provide custom allocators at state creation
 api  : can skip checksum validation for improved decoding speed
 api  : new experimental unit `lz4file` for file i/o API, by @anjiahao1
 api  : new experimental function `LZ4F_uncompressedUpdate()`, by @alexmohr
 cli  : `--list` works on `stdin` input, by @Low-power
 cli  : `--no-crc` does not produce (compression) nor check (decompression) checksums
 cli  : fix: `--test` and `--list` produce an error code when parsing invalid input
 cli  : fix: support skippable frames when passed via `stdin`, reported by @davidmankin
 build: fix: Makefile respects CFLAGS directives passed via environment variable
 build: `LZ4_FREESTANDING`, new build macro for freestanding environments, by @t-mat
 build: `make` and `make test` are compatible with `-j` parallel run
 build: AS/400 compatibility, by @jonrumsey
 build: Solaris 10 compatibility, by @pekdon
 build: MSVC 2022 support, by @t-mat
 build: improved meson script, by @eli-schwartz
 doc  : Updated LZ4 block format, provide an "implementation notes" section
 v1.9.3
 perf: highly improved speed in kernel space, by @terrelln
 perf: faster speed with Visual Studio, thanks to @wolfpld and @remittor
 perf: improved dictionary compression speed, by @felixhandte
 perf: fixed LZ4_compress_HC_destSize() ratio, detected by @hsiangkao
 perf: reduced stack usage in high compression mode, by @Yanpas
 api : LZ4_decompress_safe_partial() supports unknown compressed size, requested by @jfkthame
 api : improved LZ4F_compressBound() with automatic flushing, by Christopher Harvie
 api : can (de)compress to/from NULL without UBs
 api : fix alignment test on 32-bit systems (state initialization)
 api : fix LZ4_saveDictHC() in corner case scenario, detected by @IgorKorkin
 cli : `-l` legacy format is now compatible with `-m` multiple files, by Filipe Calasans
 cli : benchmark mode supports dictionary, by @rkoradi
 cli : fix --fast with large argument, detected by @picoHz
 build: link to user-defined memory functions with LZ4_USER_MEMORY_FUNCTIONS, suggested by Yuriy Levchenko
 build: contrib/cmake_unofficial/ moved to build/cmake/
 build: visual/* moved to build/
 build: updated meson script, by @neheb
 build: tinycc support, by Anton Kochkov
 install: Haiku support, by Jerome Duval
 doc : updated LZ4 frame format, clarify EndMark
 v1.9.2
 fix : out-of-bound read in exceptional circumstances when using decompress_partial(), by @terrelln
 fix : slim opportunity for out-of-bound write with compress_fast() with a large enough input and when providing an output smaller than recommended (< LZ4_compressBound(inputSize)), by @terrelln
 fix : rare data corruption bug with LZ4_compress_destSize(), by @terrelln
 fix : data corruption bug when Streaming with an Attached Dict in HC Mode, by @felixhandte
 perf: enable LZ4_FAST_DEC_LOOP on aarch64/GCC by default, by @prekageo
 perf: improved lz4frame streaming API speed, by @dreambottle
 perf: speed up lz4hc on slow patterns when using external dictionary, by @terrelln
 api: better in-place decompression and compression support
 cli : --list supports multi-frames files, by @gstedman
 cli: --version outputs to stdout
 cli : add option --best as an alias of -12 , by @Low-power
 misc: Integration into oss-fuzz by @cmeister2, expanded list of scenarios by @terrelln
 v1.9.1
 fix : decompression functions were reading a few bytes beyond input size (introduced in v1.9.0, reported by @ppodolsky and @danlark1)
 api : fix : lz4frame initializers compatibility with c++, reported by @degski
 cli : added command --list, based on a patch by @gabrielstedman
 build: improved Windows build, by @JPeterMugaas
 build: AIX, by Norman Green
 v1.9.0
 perf: large decompression speed improvement on x86/x64 (up to +20%) by @djwatson
 api : changed : _destSize() compression variants are promoted to stable API
 api : new : LZ4_initStream(HC), replacing LZ4_resetStream(HC)
 api : changed : LZ4_resetStream(HC) as recommended reset function, for better performance on small data
 cli : support custom block sizes, by @blezsan
 build: source code can be amalgamated, by Bing Xu
 build: added meson build, by @lzutao
 build: new build macros : LZ4_DISTANCE_MAX, LZ4_FAST_DEC_LOOP
 install: MidnightBSD, by @laffer1
 install: msys2 on Windows 10, by @vtorri
 v1.8.3
 perf: minor decompression speed improvement (~+2%) with gcc
 fix : corruption in v1.8.2 at level 9 for files > 64KB under rare conditions (#560)
 cli : new command --fast, by @jennifermliu
 cli : fixed elapsed time, and added cpu load indicator (on -vv) (#555)
 api : LZ4_decompress_safe_partial() now decodes exactly the nb of bytes requested (feature request #566)
 build : added Haiku target, by @fbrosson, and MidnightBSD, by @laffer1
 doc : updated documentation regarding dictionary compression
 v1.8.2
 perf: *much* faster dictionary compression on small files, by @felixhandte
 perf: improved decompression speed and binary size, by Alexey Tourbin (@svpv)
 perf: slightly faster HC compression and decompression speed
 perf: very small compression ratio improvement
 fix : compression compatible with low memory addresses (< 0xFFFF)
 fix : decompression segfault when provided with NULL input, by @terrelln
 cli : new command --favor-decSpeed
 cli : benchmark mode more accurate for small inputs
 fullbench : can bench _destSize() variants, by @felixhandte
 doc : clarified block format parsing restrictions, by Alexey Tourbin (@svpv)
 v1.8.1
 perf : faster and stronger ultra modes (levels 10+)
 perf : slightly faster compression and decompression speed
 perf : fix bad degenerative case, reported by @c-morgenstern
 fix : decompression failed when using a combination of extDict + low memory address (#397), reported and fixed by Julian Scheid (@jscheid)
 cli : support for dictionary compression (`-D`), by Felix Handte @felixhandte
 cli : fix : `lz4 -d --rm` preserves timestamp (#441)
 cli : fix : do not modify /dev/null permission as root, by @aliceatlas
 api : `_destSize()` variant supported for all compression levels
 build  : `make` and `make test` compatible with `-jX`, reported by @mwgamera
 build  : can control LZ4LIB_VISIBILITY macro, by @mikir
 install: fix man page directory (#387), reported by Stuart Cardall (@itoffshore)
 v1.8.0
 cli : fix : do not modify /dev/null permissions, reported by @Maokaman1
 cli : added GNU separator -- specifying that all following arguments are files
 API : added LZ4_compress_HC_destSize(), by Oleg (@remittor)
 API : added LZ4F_resetDecompressionContext()
 API : lz4frame : negative compression levels trigger fast acceleration, request by Lawrence Chan
 API : lz4frame : can control block checksum and dictionary ID
 API : fix : expose obsolete decoding functions, reported by Chen Yufei
 API : experimental : lz4frame_static : new dictionary compression API
 build : fix : static lib installation, by Ido Rosen
 build : dragonFlyBSD, OpenBSD, NetBSD supported
 build : LZ4_MEMORY_USAGE can be modified at compile time, through external define
 doc : Updated LZ4 Frame format to v1.6.0, restoring Dictionary-ID field
 doc : lz4 api manual, by Przemyslaw Skibinski
 v1.7.5
 lz4hc : new high compression mode : levels 10-12 compress more and slower, by Przemyslaw Skibinski
 lz4cat : fix : works with relative path (#284) and stdin (#285) (reported by @beiDei8z)
 cli : fix minor notification when using -r recursive mode
 API : lz4frame : LZ4F_frameBound(0) gives upper bound of *flush() and *End() operations (#290, #280)
 doc : markdown version of man page, by Takayuki Matsuoka (#279)
 build : Makefile : fix make -jX lib+exe concurrency (#277)
 build : cmake : improvements by Michał Górny (#296)
 v1.7.4.2
 fix : Makefile : release build compatible with PIE and customized compilation directives provided through environment variables (#274, reported by Antoine Martin)
 v1.7.4
 Improved : much better speed in -mx32 mode
 cli : fix : Large file support in 32-bits mode on Mac OS-X
 fix : compilation on gcc 4.4 (#272), reported by Antoine Martin
 v1.7.3
 Changed : moved to versioning; package, cli and library have same version number
 Improved: Small decompression speed boost
 Improved: Small compression speed improvement on 64-bits systems
 Improved: Small compression ratio and speed improvement on small files
 Improved: Significant speed boost on ARMv6 and ARMv7
 Fix : better ratio on 64-bits big-endian targets
 Improved cmake build script, by Evan Nemerson
 New liblz4-dll project, by Przemyslaw Skibinki
 Makefile: Generates object files (*.o) for faster (re)compilation on low power systems
 cli : new : --rm and --help commands
 cli : new : preserved file attributes, by Przemyslaw Skibinki
 cli : fix : crash on some invalid inputs
 cli : fix : -t correctly validates lz4-compressed files, by Nick Terrell
 cli : fix : detects and reports fread() errors, thanks to Hiroshi Fujishima report #243
 cli : bench : new : -r recursive mode
 lz4cat : can cat multiple files in a single command line (#184)
 Added : doc/lz4_manual.html, by Przemyslaw Skibinski
 Added : dictionary compression and frame decompression examples, by Nick Terrell
 Added : Debianization, by Evgeniy Polyakov
 r131
 New    : Dos/DJGPP target, thanks to Louis Santillan (#114)
 Added  : Example using lz4frame library, by Zbigniew Jędrzejewski-Szmek (#118)
 Changed: xxhash symbols are modified (namespace emulation) within liblz4
 r130:
 Fixed  : incompatibility sparse mode vs console, reported by Yongwoon Cho (#105)
 Fixed  : LZ4IO exits too early when frame crc not present, reported by Yongwoon Cho (#106)
 Fixed  : incompatibility sparse mode vs append mode, reported by Takayuki Matsuoka (#110)
 Performance fix : big compression speed boost for clang (+30%)
 New    : cross-version test, by Takayuki Matsuoka
 r129:
 Added  : LZ4_compress_fast(), LZ4_compress_fast_continue()
 Added  : LZ4_compress_destSize()
 Changed: New lz4 and lz4hc compression API. Previous function prototypes still supported.
 Changed: Sparse file support enabled by default
 New    : LZ4 CLI improved performance compressing/decompressing multiple files (#86, kind contribution from Kyle J. Harper & Takayuki Matsuoka)
 Fixed  : GCC 4.9+ optimization bug - Reported by Markus Trippelsdorf, Greg Slazinski & Evan Nemerson
 Changed: Enums converted to LZ4F_ namespace convention - by Takayuki Matsuoka
 Added  : AppVeyor CI environment, for Visual tests - Suggested by Takayuki Matsuoka
 Modified:Obsolete functions generate warnings - Suggested by Evan Nemerson, contributed by Takayuki Matsuoka
 Fixed  : Bug #75 (unfinished stream), reported by Yongwoon Cho
 Updated: Documentation converted to MarkDown format
 r128:
 New    : lz4cli sparse file support (Requested by Neil Wilson, and contributed by Takayuki Matsuoka)
 New    : command -m, to compress multiple files in a single command (suggested by Kyle J. Harper)
 Fixed  : Restored lz4hc compression ratio (slightly lower since r124)
 New    : lz4 cli supports long commands (suggested by Takayuki Matsuoka)
 New    : lz4frame & lz4cli frame content size support
 New    : lz4frame supports skippable frames, as requested by Sergey Cherepanov
 Changed: Default "make install" directory is /usr/local, as notified by Ron Johnson
 New    : lz4 cli supports "pass-through" mode, requested by Neil Wilson
 New    : datagen can generate sparse files
 New    : scan-build tests, thanks to kind help by Takayuki Matsuoka
 New    : g++ compatibility tests
 New    : arm cross-compilation test, thanks to kind help by Takayuki Matsuoka
 Fixed  : Fuzzer + frametest compatibility with NetBSD (issue #48, reported by Thomas Klausner)
 Added  : Visual project directory
 Updated: Man page & Specification
 r127:
 N/A   : added a file on SVN
 r126:
 New   : lz4frame API is now integrated into liblz4
 Fixed : GCC 4.9 bug on highest performance settings, reported by Greg Slazinski
 Fixed : bug within LZ4 HC streaming mode, reported by James Boyle
 Fixed : older compiler don't like nameless unions, reported by Cheyi Lin
 Changed : lz4 is C90 compatible
 Changed : added -pedantic option, fixed a few mminor warnings
 r125:
 Changed : endian and alignment code
 Changed : directory structure : new "lib" directory
 Updated : lz4io, now uses lz4frame
 Improved: slightly improved decoding speed
 Fixed : LZ4_compress_limitedOutput(); Special thanks to Christopher Speller !
 Fixed : some alignment warnings under clang
 Fixed : deprecated function LZ4_slideInputBufferHC()
 r124:
 New : LZ4 HC streaming mode
 Fixed : LZ4F_compressBound() using null preferencesPtr
 Updated : xxHash to r38
 Updated library number, to 1.4.0
 r123:
 Added : experimental lz4frame API, thanks to Takayuki Matsuoka and Christopher Jackson for testings
 Fix : s390x support, thanks to Nobuhiro Iwamatsu
 Fix : test mode (-t) no longer requires confirmation, thanks to Thary Nguyen
 r122:
 Fix : AIX & AIX64 support (SamG)
 Fix : mips 64-bits support (lew van)
 Added : Examples directory, using code examples from Takayuki Matsuoka
 Updated : Framing specification, to v1.4.1
 Updated : xxHash, to r36
 r121:
 Added : Makefile : install for kFreeBSD and Hurd (Nobuhiro Iwamatsu)
 Fix : Makefile : install for OS-X and BSD, thanks to Takayuki Matsuoka
 r120:
 Modified : Streaming API, using strong types
 Added : LZ4_versionNumber(), thanks to Takayuki Matsuoka
 Fix : OS-X : library install name, thanks to Clemens Lang
 Updated : Makefile : synchronize library version number with lz4.h, thanks to Takayuki Matsuoka
 Updated : Makefile : stricter compilation flags
 Added : pkg-config, thanks to Zbigniew Jędrzejewski-Szmek (issue 135)
 Makefile : lz4-test only test native binaries, as suggested by Michał Górny (issue 136)
 Updated : xxHash to r35
 r119:
 Fix : Issue 134 : extended malicious address space overflow in 32-bits mode for some specific configurations
 r118:
 New : LZ4 Streaming API (Fast version), special thanks to Takayuki Matsuoka
 New : datagen : parametrable synthetic data generator for tests
 Improved : fuzzer, support more test cases, more parameters, ability to jump to specific test
 fix : support ppc64le platform (issue 131)
 fix : Issue 52 (malicious address space overflow in 32-bits mode when using large custom format)
 fix : Makefile : minor issue 130 : header files permissions
 r117:
 Added : man pages for lz4c and lz4cat
 Added : automated tests on Travis, thanks to Takayuki Matsuoka !
 fix : block-dependency command line (issue 127)
 fix : lz4fullbench (issue 128)
 r116:
 hotfix (issue 124 & 125)
 r115:
 Added : lz4cat utility, installed on POSX systems (issue 118)
 OS-X compatible compilation of dynamic library (issue 115)
 r114:
 Makefile : library correctly compiled with -O3 switch (issue 114)
 Makefile : library compilation compatible with clang
 Makefile : library is versioned and linked (issue 119)
 lz4.h : no more static inline prototypes (issue 116)
 man : improved header/footer (issue 111)
 Makefile : Use system default $(CC) & $(MAKE) variables (issue 112)
 xxhash : updated to r34
 r113:
 Large decompression speed improvement for GCC 32-bits. Thanks to Valery Croizier !
 LZ4HC : Compression Level is now a programmable parameter (CLI from 4 to 9)
 Separated IO routines from command line (lz4io.c)
 Version number into lz4.h (suggested by Francesc Alted)
 r112:
 quickfix
 r111 :
 Makefile : added capability to install libraries
 Modified Directory tree, to better separate libraries from programs.
 r110 :
 lz4 & lz4hc : added capability to allocate state & stream state with custom allocator (issue 99)
 fuzzer & fullbench : updated to test new functions
 man : documented -l command (Legacy format, for Linux kernel compression) (issue 102)
 cmake : improved version by Mika Attila, building programs and libraries (issue 100)
 xxHash : updated to r33
 Makefile : clean also delete local package .tar.gz
 r109 :
 lz4.c : corrected issue 98 (LZ4_compress_limitedOutput())
 Makefile : can specify version number from makefile
 r108 :
 lz4.c : corrected compression efficiency issue 97 in 64-bits chained mode (-BD) for streams > 4 GB (thanks Roman Strashkin for reporting)
 r107 :
 Makefile : support DESTDIR for staged installs. Thanks Jorge Aparicio.
 Makefile : make install installs both lz4 and lz4c (Jorge Aparicio)
 Makefile : removed -Wno-implicit-declaration compilation switch
 lz4cli.c : include <stduni.h> for isatty() (Luca Barbato)
 lz4.h : introduced LZ4_MAX_INPUT_SIZE constant (Shay Green)
 lz4.h : LZ4_compressBound() : unified macro and inline definitions (Shay Green)
 lz4.h : LZ4_decompressSafe_partial() : clarify comments (Shay Green)
 lz4.c : LZ4_compress() verify input size condition (Shay Green)
 bench.c : corrected a bug in free memory size evaluation
 cmake : install into bin/ directory (Richard Yao)
 cmake : check for just C compiler (Elan Ruusamae)
 r106 :
 Makefile : make dist modify text files in the package to respect Unix EoL convention
 lz4cli.c : corrected small display bug in HC mode
 r105 :
 Makefile : New install script and man page, contributed by Prasad Pandit
 lz4cli.c : Minor modifications, for easier extensibility
 COPYING  : added license file
 LZ4_Streaming_Format.odt : modified file name to remove white space characters
 Makefile : .exe suffix now properly added only for Windows target
--- a/README.md
+++ b/README.md
@ -0,0 +1,120 @@
 LZ4 - Extremely fast compression
 ================================
 LZ4 is lossless compression algorithm,
 providing compression speed > 500 MB/s per core,
 scalable with multi-cores CPU.
 It features an extremely fast decoder,
 with speed in multiple GB/s per core,
 typically reaching RAM speed limits on multi-core systems.
 Speed can be tuned dynamically, selecting an "acceleration" factor
 which trades compression ratio for faster speed.
 On the other end, a high compression derivative, LZ4_HC, is also provided,
 trading CPU time for improved compression ratio.
 All versions feature the same decompression speed.
 LZ4 is also compatible with [dictionary compression](https://github.com/facebook/zstd#the-case-for-small-data-compression),
 both at [API](https://github.com/lz4/lz4/blob/v1.8.3/lib/lz4frame.h#L481) and [CLI](https://github.com/lz4/lz4/blob/v1.8.3/programs/lz4.1.md#operation-modifiers) levels.
 It can ingest any input file as dictionary, though only the final 64KB are used.
 This capability can be combined with the [Zstandard Dictionary Builder](https://github.com/facebook/zstd/blob/v1.3.5/programs/zstd.1.md#dictionary-builder),
 in order to drastically improve compression performance on small files.
 LZ4 library is provided as open-source software using BSD 2-Clause license.
 |Branch      |Status   |
 |------------|---------|
 |dev         | [![Build Status][travisDevBadge]][travisLink]    [![Build status][AppveyorDevBadge]][AppveyorLink]                                         |
 [travisDevBadge]: https://travis-ci.org/lz4/lz4.svg?branch=dev "Continuous Integration test suite"
 [travisLink]: https://travis-ci.org/lz4/lz4
 [AppveyorDevBadge]: https://ci.appveyor.com/api/projects/status/github/lz4/lz4?branch=dev&svg=true "Windows test suite"
 [AppveyorLink]: https://ci.appveyor.com/project/YannCollet/lz4-1lndh
 Benchmarks
 -------------------------
 The benchmark uses [lzbench], from @inikep
 compiled with GCC v8.2.0 on Linux 64-bits (Ubuntu 4.18.0-17).
 The reference system uses a Core i7-9700K CPU @ 4.9GHz (w/ turbo boost).
 Benchmark evaluates the compression of reference [Silesia Corpus]
 in single-thread mode.
 [lzbench]: https://github.com/inikep/lzbench
 [Silesia Corpus]: http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia
 |  Compressor             | Ratio   | Compression | Decompression |
 |  ----------             | -----   | ----------- | ------------- |
 |  memcpy                 |  1.000  | 13700 MB/s  |  13700 MB/s   |
 |**LZ4 default (v1.9.0)** |**2.101**| **780 MB/s**| **4970 MB/s** |
 |  LZO 2.09               |  2.108  |   670 MB/s  |    860 MB/s   |
 |  QuickLZ 1.5.0          |  2.238  |   575 MB/s  |    780 MB/s   |
 |  Snappy 1.1.4           |  2.091  |   565 MB/s  |   1950 MB/s   |
 | [Zstandard] 1.4.0 -1    |  2.883  |   515 MB/s  |   1380 MB/s   |
 |  LZF v3.6               |  2.073  |   415 MB/s  |    910 MB/s   |
 | [zlib] deflate 1.2.11 -1|  2.730  |   100 MB/s  |    415 MB/s   |
 |**LZ4 HC -9 (v1.9.0)**   |**2.721**|    41 MB/s  | **4900 MB/s** |
 | [zlib] deflate 1.2.11 -6|  3.099  |    36 MB/s  |    445 MB/s   |
 [zlib]: http://www.zlib.net/
 [Zstandard]: http://www.zstd.net/
 LZ4 is also compatible and optimized for x32 mode,
 for which it provides additional speed performance.
 Installation
 -------------------------
 ```
 make
 make install     # this command may require root permissions
 ```
 LZ4's `Makefile` supports standard [Makefile conventions],
 including [staged installs], [redirection], or [command redefinition].
 It is compatible with parallel builds (`-j#`).
 [Makefile conventions]: https://www.gnu.org/prep/standards/html_node/Makefile-Conventions.html
 [staged installs]: https://www.gnu.org/prep/standards/html_node/DESTDIR.html
 [redirection]: https://www.gnu.org/prep/standards/html_node/Directory-Variables.html
 [command redefinition]: https://www.gnu.org/prep/standards/html_node/Utilities-in-Makefiles.html
 ### Building LZ4 - Using vcpkg
 You can download and install LZ4 using the [vcpkg](https://github.com/Microsoft/vcpkg) dependency manager:
    git clone https://github.com/Microsoft/vcpkg.git
    cd vcpkg
    ./bootstrap-vcpkg.sh
    ./vcpkg integrate install
    vcpkg install lz4
 The LZ4 port in vcpkg is kept up to date by Microsoft team members and community contributors. If the version is out of date, please [create an issue or pull request](https://github.com/Microsoft/vcpkg) on the vcpkg repository.
 Documentation
 -------------------------
 The raw LZ4 block compression format is detailed within [lz4_Block_format].
 Arbitrarily long files or data streams are compressed using multiple blocks,
 for streaming requirements. These blocks are organized into a frame,
 defined into [lz4_Frame_format].
 Interoperable versions of LZ4 must also respect the frame format.
 [lz4_Block_format]: doc/lz4_Block_format.md
 [lz4_Frame_format]: doc/lz4_Frame_format.md
 Other source versions
 -------------------------
 Beyond the C reference source,
 many contributors have created versions of lz4 in multiple languages
 (Java, C#, Python, Perl, Ruby, etc.).
 A list of known source ports is maintained on the [LZ4 Homepage].
 [LZ4 Homepage]: http://www.lz4.org
--- a/appveyor.yml
+++ b/appveyor.yml
@ -0,0 +1,147 @@
 version: 1.0.{build}
 environment:
  matrix:
  - COMPILER: "gcc"
    PLATFORM: "mingw64"
  - COMPILER: "gcc"
    PLATFORM: "mingw32"
  - COMPILER: "visual"
    CONFIGURATION: "Debug"
    PLATFORM: "x64"
  - COMPILER: "visual"
    CONFIGURATION: "Debug"
    PLATFORM: "Win32"
  - COMPILER: "visual"
    CONFIGURATION: "Release"
    PLATFORM: "x64"
  - COMPILER: "visual"
    CONFIGURATION: "Release"
    PLATFORM: "Win32"
  - COMPILER: "gcc"
    PLATFORM: "clang"
 install:
  - ECHO Installing %COMPILER% %PLATFORM% %CONFIGURATION%
  - MKDIR bin
  - if [%COMPILER%]==[gcc] SET PATH_ORIGINAL=%PATH%
  - if [%COMPILER%]==[gcc] (
      SET "PATH_MINGW32=c:\MinGW\bin;c:\MinGW\usr\bin" &&
      SET "PATH_MINGW64=c:\msys64\mingw64\bin;c:\msys64\usr\bin" &&
      COPY C:\MinGW\bin\mingw32-make.exe C:\MinGW\bin\make.exe &&
      COPY C:\MinGW\bin\gcc.exe C:\MinGW\bin\cc.exe
    ) else (
      IF [%PLATFORM%]==[x64] (SET ADDITIONALPARAM=/p:LibraryPath="C:\Program Files\Microsoft SDKs\Windows\v7.1\lib\x64;c:\Program Files (x86)\Microsoft Visual Studio 10.0\VC\lib\amd64;C:\Program Files (x86)\Microsoft Visual Studio 10.0\;C:\Program Files (x86)\Microsoft Visual Studio 10.0\lib\amd64;")
    )
 build_script:
  - if [%PLATFORM%]==[mingw32] SET PATH=%PATH_MINGW32%;%PATH_ORIGINAL%
  - if [%PLATFORM%]==[mingw64] SET PATH=%PATH_MINGW64%;%PATH_ORIGINAL%
  - if [%PLATFORM%]==[clang] SET PATH=%PATH_MINGW64%;%PATH_ORIGINAL%
  - ECHO *** &&
      ECHO Building %COMPILER% %PLATFORM% %CONFIGURATION% &&
      ECHO ***
  - if [%PLATFORM%]==[clang] (clang -v)
  - if [%COMPILER%]==[gcc] (gcc -v)
  - if [%COMPILER%]==[gcc] (
      echo ----- &&
      make -v &&
      echo ----- &&
      if not [%PLATFORM%]==[clang] (
        make -C programs lz4 &&
        make -C tests fullbench &&
        make -C tests fuzzer &&
        make -C lib lib V=1
      ) ELSE (
        make -C programs lz4 CC=clang MOREFLAGS="--target=x86_64-w64-mingw32 -Werror -Wconversion -Wno-sign-conversion" &&
        make -C tests fullbench CC=clang MOREFLAGS="--target=x86_64-w64-mingw32 -Werror -Wconversion -Wno-sign-conversion" &&
        make -C tests fuzzer CC=clang MOREFLAGS="--target=x86_64-w64-mingw32 -Werror -Wconversion -Wno-sign-conversion" &&
        make -C lib lib CC=clang MOREFLAGS="--target=x86_64-w64-mingw32 -Werror -Wconversion -Wno-sign-conversion"
      )
    )
  - if [%COMPILER%]==[gcc] if not [%PLATFORM%]==[clang] (
      MKDIR bin\dll bin\static bin\example bin\include &&
      COPY tests\fullbench.c bin\example\ &&
      COPY lib\xxhash.c bin\example\ &&
      COPY lib\xxhash.h bin\example\ &&
      COPY lib\lz4.h bin\include\ &&
      COPY lib\lz4hc.h bin\include\ &&
      COPY lib\lz4frame.h bin\include\ &&
      COPY lib\liblz4.a bin\static\liblz4_static.lib &&
      COPY lib\dll\* bin\dll\ &&
      COPY lib\dll\example\Makefile bin\example\ &&
      COPY lib\dll\example\fullbench-dll.* bin\example\ &&
      COPY lib\dll\example\README.md bin\ &&
      COPY programs\lz4.exe bin\lz4.exe
    )
  - if [%COMPILER%]==[gcc] if [%PLATFORM%]==[mingw64] (
      7z.exe a -bb1 bin\lz4_x64.zip NEWS .\bin\lz4.exe .\bin\README.md .\bin\example .\bin\dll .\bin\static .\bin\include &&
      appveyor PushArtifact bin\lz4_x64.zip
    )
  - if [%COMPILER%]==[gcc] if [%PLATFORM%]==[mingw32] (
      7z.exe a -bb1 bin\lz4_x86.zip NEWS .\bin\lz4.exe .\bin\README.md .\bin\example .\bin\dll .\bin\static .\bin\include &&
      appveyor PushArtifact bin\lz4_x86.zip
    )
  - if [%COMPILER%]==[gcc] (COPY tests\*.exe programs\)
  - if [%COMPILER%]==[visual] (
      ECHO *** &&
      ECHO *** Building Visual Studio 2010 %PLATFORM%\%CONFIGURATION% &&
      ECHO *** &&
      msbuild "build\VS2010\lz4.sln" %ADDITIONALPARAM% /m /verbosity:minimal /property:PlatformToolset=v100 /t:Clean,Build /p:Platform=%PLATFORM% /p:Configuration=%CONFIGURATION% /p:EnableWholeProgramOptimization=true /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll" &&
      ECHO *** &&
      ECHO *** Building Visual Studio 2012 %PLATFORM%\%CONFIGURATION% &&
      ECHO *** &&
      msbuild "build\VS2010\lz4.sln" /m /verbosity:minimal /property:PlatformToolset=v110 /t:Clean,Build /p:Platform=%PLATFORM% /p:Configuration=%CONFIGURATION% /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll" &&
      ECHO *** &&
      ECHO *** Building Visual Studio 2013 %PLATFORM%\%CONFIGURATION% &&
      ECHO *** &&
      msbuild "build\VS2010\lz4.sln" /m /verbosity:minimal /property:PlatformToolset=v120 /t:Clean,Build /p:Platform=%PLATFORM% /p:Configuration=%CONFIGURATION% /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll" &&
      ECHO *** &&
      ECHO *** Building Visual Studio 2015 %PLATFORM%\%CONFIGURATION% &&
      ECHO *** &&
      msbuild "build\VS2010\lz4.sln" /m /verbosity:minimal /property:PlatformToolset=v140 /t:Clean,Build /p:Platform=%PLATFORM% /p:Configuration=%CONFIGURATION% /logger:"C:\Program Files\AppVeyor\BuildAgent\Appveyor.MSBuildLogger.dll" &&
      COPY build\VS2010\bin\%PLATFORM%_%CONFIGURATION%\*.exe programs\
    )
 test_script:
  - ECHO *** &&
      ECHO Testing %COMPILER% %PLATFORM% %CONFIGURATION% &&
      ECHO ***
  - if not [%COMPILER%]==[unknown] (
      CD programs &&
      lz4 -h &&
      lz4 -i1b lz4.exe &&
      lz4 -i1b5 lz4.exe &&
      lz4 -i1b10 lz4.exe &&
      lz4 -i1b15 lz4.exe &&
      echo ------- lz4 tested ------- &&
      fullbench.exe -i1 fullbench.exe &&
      echo trying to launch fuzzer.exe &&
      fuzzer.exe -v -T30s
    )
 artifacts:
  - path: bin\lz4_x64.zip
  - path: bin\lz4_x86.zip
 deploy:
 - provider: GitHub
  artifact: bin\lz4_x64.zip
  auth_token:
    secure: w6UJaGie0qbZvffr/fqyhO/Vj8rMiQWnv9a8qm3gxfngdHDTMT42wYupqJpIExId
  force_update: true
  prerelease: true
  on:
    COMPILER: gcc
    PLATFORM: "mingw64"
    appveyor_repo_tag: true
 - provider: GitHub
  artifact: bin\lz4_x86.zip
  auth_token:
    secure: w6UJaGie0qbZvffr/fqyhO/Vj8rMiQWnv9a8qm3gxfngdHDTMT42wYupqJpIExId
  force_update: true
  prerelease: true
  on:
    COMPILER: gcc
    PLATFORM: "mingw32"
    appveyor_repo_tag: true
--- a/build/.gitignore
+++ b/build/.gitignore
@ -0,0 +1,16 @@
 # Visual C++
 .vs/
 *Copy
 *.db
 *.opensdf
 *.sdf
 *.suo
 *.user
 ver*/
 VS2010/bin/
 VS2017/bin/
 ipch
 # Fixup for lz4 project directories
 !VS2010/lz4
 !VS2017/lz4
--- a/build/README.md
+++ b/build/README.md
@ -0,0 +1,55 @@
 Projects for various integrated development environments (IDE)
 ==============================================================
 #### Included projects
 The following projects are included with the lz4 distribution:
 - `cmake` - CMake project
 - `VS2010` - Visual Studio 2010 project (which also works well with Visual Studio 2012, 2013, 2015)
 - `VS2017` - Visual Studio 2017 project
 #### How to compile lz4 with Visual Studio
 1. Install Visual Studio e.g. VS 2015 Community Edition (it's free).
 2. Download the latest version of lz4 from https://github.com/lz4/lz4/releases
 3. Decompress ZIP archive.
 4. Go to decompressed directory then to `build` then `VS2010` and open `lz4.sln`
 5. Visual Studio will ask about converting VS2010 project to VS2015 and you should agree.
 6. Change `Debug` to `Release` and if you have 64-bit Windows change also `Win32` to `x64`.
 7. Press F7 on keyboard or select `BUILD` from the menu bar and choose `Build Solution`.
 8. If compilation will be fine a compiled executable will be in `build\VS2010\bin\x64_Release\lz4.exe`
 #### Projects available within lz4.sln
 The Visual Studio solution file `lz4.sln` contains many projects that will be compiled to the
 `build\VS2010\bin\$(Platform)_$(Configuration)` directory. For example `lz4` set to `x64` and
 `Release` will be compiled to `build\VS2010\bin\x64_Release\lz4.exe`. The solution file contains the
 following projects:
 - `lz4` : Command Line Utility, supporting gzip-like arguments
 - `datagen` : Synthetic and parametrable data generator, for tests
 - `frametest` : Test tool that checks lz4frame integrity on target platform
 - `fullbench`  : Precisely measure speed for each lz4 inner functions
 - `fuzzer` : Test tool, to check lz4 integrity on target platform
 - `liblz4` : A static LZ4 library compiled to `liblz4_static.lib`
 - `liblz4-dll` : A dynamic LZ4 library (DLL) compiled to `liblz4.dll` with the import library `liblz4.lib`
 - `fullbench-dll` : The fullbench program compiled with the import library; the executable requires LZ4 DLL
 #### Using LZ4 DLL with Microsoft Visual C++ project
 The header files `lib\lz4.h`, `lib\lz4hc.h`, `lib\lz4frame.h` and the import library
 `build\VS2010\bin\$(Platform)_$(Configuration)\liblz4.lib` are required to
 compile a project using Visual C++.
 1. The path to header files should be added to `Additional Include Directories` that can
   be found in Project Properties of Visual Studio IDE in the `C/C++` Property Pages on the `General` page.
 2. The import library has to be added to `Additional Dependencies` that can
   be found in Project Properties in the `Linker` Property Pages on the `Input` page.
   If one will provide only the name `liblz4.lib` without a full path to the library
   then the directory has to be added to `Linker\General\Additional Library Directories`.
 The compiled executable will require LZ4 DLL which is available at
 `build\VS2010\bin\$(Platform)_$(Configuration)\liblz4.dll`.
--- a/build/VS2010/datagen/datagen.vcxproj
+++ b/build/VS2010/datagen/datagen.vcxproj
@ -0,0 +1,169 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Project DefaultTargets="Build" ToolsVersion="4.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
  <ItemGroup Label="ProjectConfigurations">
    <ProjectConfiguration Include="Debug|Win32">
      <Configuration>Debug</Configuration>
      <Platform>Win32</Platform>
    </ProjectConfiguration>
    <ProjectConfiguration Include="Debug|x64">
      <Configuration>Debug</Configuration>
      <Platform>x64</Platform>
    </ProjectConfiguration>
    <ProjectConfiguration Include="Release|Win32">
      <Configuration>Release</Configuration>
      <Platform>Win32</Platform>
    </ProjectConfiguration>
    <ProjectConfiguration Include="Release|x64">
      <Configuration>Release</Configuration>
      <Platform>x64</Platform>
    </ProjectConfiguration>
  </ItemGroup>
  <PropertyGroup Label="Globals">
    <ProjectGuid>{D745AE2F-596A-403A-9B91-81A8C6779243}</ProjectGuid>
    <Keyword>Win32Proj</Keyword>
    <RootNamespace>datagen</RootNamespace>
    <OutDir>$(SolutionDir)bin\$(Platform)_$(Configuration)\</OutDir>
    <IntDir>$(SolutionDir)bin\obj\$(RootNamespace)_$(Platform)_$(Configuration)\</IntDir>
  </PropertyGroup>
  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.Default.props" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>true</UseDebugLibraries>
    <CharacterSet>Unicode</CharacterSet>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>true</UseDebugLibraries>
    <CharacterSet>Unicode</CharacterSet>
  </PropertyGroup>
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|Win32'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>false</UseDebugLibraries>
    <CharacterSet>Unicode</CharacterSet>
    <WholeProgramOptimization Condition="'$(EnableWholeProgramOptimization)'=='true'">true</WholeProgramOptimization>
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  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="Configuration">
    <ConfigurationType>Application</ConfigurationType>
    <UseDebugLibraries>false</UseDebugLibraries>
    <CharacterSet>Unicode</CharacterSet>
    <WholeProgramOptimization Condition="'$(EnableWholeProgramOptimization)'=='true'">true</WholeProgramOptimization>
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  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.props" />
  <ImportGroup Label="ExtensionSettings">
  </ImportGroup>
  <ImportGroup Label="PropertySheets" Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
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  <ImportGroup Condition="'$(Configuration)|$(Platform)'=='Release|x64'" Label="PropertySheets">
    <Import Project="$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props" Condition="exists('$(UserRootDir)\Microsoft.Cpp.$(Platform).user.props')" Label="LocalAppDataPlatform" />
  </ImportGroup>
  <PropertyGroup Label="UserMacros" />
  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <LinkIncremental>true</LinkIncremental>
    <IncludePath>$(IncludePath);$(UniversalCRT_IncludePath);$(SolutionDir)..\..\programs;$(SolutionDir)..\..\lib;$(VCInstallDir)include;$(VCInstallDir)atlmfc\include;$(WindowsSDK_IncludePath);</IncludePath>
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  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|x64'">
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  <ItemDefinitionGroup Condition="'$(Configuration)|$(Platform)'=='Debug|Win32'">
    <ClCompile>
      <PrecompiledHeader>
      </PrecompiledHeader>
      <WarningLevel>Level4</WarningLevel>
      <Optimization>Disabled</Optimization>
      <PreprocessorDefinitions>WIN32;_DEBUG;_CONSOLE;%(PreprocessorDefinitions)</PreprocessorDefinitions>
      <TreatWarningAsError>true</TreatWarningAsError>
      <EnablePREfast>false</EnablePREfast>
      <RuntimeLibrary Condition="'$(UseStaticCRT)'=='true'">MultiThreadedDebug</RuntimeLibrary>
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    <Link>
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      <GenerateDebugInformation>true</GenerateDebugInformation>
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      <IntrinsicFunctions>true</IntrinsicFunctions>
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      <TreatWarningAsError>false</TreatWarningAsError>
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 //
 #include "lz4.h" /* LZ4_VERSION_STRING */
 #define APSTUDIO_READONLY_SYMBOLS
 #include "verrsrc.h"
 #undef APSTUDIO_READONLY_SYMBOLS
 #if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
 LANGUAGE 9, 1
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 //
 // Version
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--- a/build/VS2010/lz4.sln
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--- a/build/VS2010/lz4/lz4.rc
+++ b/build/VS2010/lz4/lz4.rc
@ -0,0 +1,51 @@
 // Microsoft Visual C++ generated resource script.
 //
 #include "lz4.h" /* LZ4_VERSION_STRING */
 #define APSTUDIO_READONLY_SYMBOLS
 #include "verrsrc.h"
 #undef APSTUDIO_READONLY_SYMBOLS
 #if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
 LANGUAGE 9, 1
 /////////////////////////////////////////////////////////////////////////////
 //
 // Version
 //
 VS_VERSION_INFO     VERSIONINFO
  FILEVERSION       LZ4_VERSION_MAJOR,LZ4_VERSION_MINOR,LZ4_VERSION_RELEASE,0
  PRODUCTVERSION    LZ4_VERSION_MAJOR,LZ4_VERSION_MINOR,LZ4_VERSION_RELEASE,0
 FILEFLAGSMASK VS_FFI_FILEFLAGSMASK
 #ifdef _DEBUG
 FILEFLAGS VS_FF_DEBUG
 #else
 FILEFLAGS 0x0L
 #endif
 FILEOS VOS_NT_WINDOWS32
 FILETYPE VFT_DLL
 FILESUBTYPE VFT2_UNKNOWN
 BEGIN
    BLOCK "StringFileInfo"
    BEGIN
        BLOCK "040904B0"
        BEGIN
            VALUE "CompanyName", "Yann Collet"
            VALUE "FileDescription", "Extremely fast compression"
            VALUE "FileVersion", LZ4_VERSION_STRING
            VALUE "InternalName", "lz4.exe"
            VALUE "LegalCopyright", "Copyright (C) 2013-2020, Yann Collet"
            VALUE "OriginalFilename", "lz4.exe"
            VALUE "ProductName", "LZ4"
            VALUE "ProductVersion", LZ4_VERSION_STRING
        END
    END
    BLOCK "VarFileInfo"
    BEGIN
        VALUE "Translation", 0x0409, 1200
    END
 END
 #endif
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 //
 #include "lz4.h" /* LZ4_VERSION_STRING */
 #define APSTUDIO_READONLY_SYMBOLS
 #include "verrsrc.h"
 #undef APSTUDIO_READONLY_SYMBOLS
 #if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
 LANGUAGE 9, 1
 /////////////////////////////////////////////////////////////////////////////
 //
 // Version
 //
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 FILEFLAGS VS_FF_DEBUG
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 // Microsoft Visual C++ generated resource script.
 //
 #include "lz4.h" /* LZ4_VERSION_STRING */
 #define APSTUDIO_READONLY_SYMBOLS
 #include "verrsrc.h"
 #undef APSTUDIO_READONLY_SYMBOLS
 #if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
 LANGUAGE 9, 1
 /////////////////////////////////////////////////////////////////////////////
 //
 // Version
 //
 VS_VERSION_INFO     VERSIONINFO
  FILEVERSION       LZ4_VERSION_MAJOR,LZ4_VERSION_MINOR,LZ4_VERSION_RELEASE,0
  PRODUCTVERSION    LZ4_VERSION_MAJOR,LZ4_VERSION_MINOR,LZ4_VERSION_RELEASE,0
 FILEFLAGSMASK VS_FFI_FILEFLAGSMASK
 #ifdef _DEBUG
 FILEFLAGS VS_FF_DEBUG
 #else
 FILEFLAGS 0x0L
 #endif
 FILEOS VOS_NT_WINDOWS32
 FILETYPE VFT_DLL
 FILESUBTYPE VFT2_UNKNOWN
 BEGIN
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        BLOCK "040904B0"
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            VALUE "ProductVersion", LZ4_VERSION_STRING
        END
    END
    BLOCK "VarFileInfo"
    BEGIN
        VALUE "Translation", 0x0409, 1200
    END
 END
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 // Microsoft Visual C++ generated resource script.
 //
 #include "lz4.h" /* LZ4_VERSION_STRING */
 #define APSTUDIO_READONLY_SYMBOLS
 #include "verrsrc.h"
 #undef APSTUDIO_READONLY_SYMBOLS
 #if !defined(AFX_RESOURCE_DLL) || defined(AFX_TARG_ENU)
 LANGUAGE 9, 1
 /////////////////////////////////////////////////////////////////////////////
 //
 // Version
 //
 VS_VERSION_INFO     VERSIONINFO
  FILEVERSION       LZ4_VERSION_MAJOR,LZ4_VERSION_MINOR,LZ4_VERSION_RELEASE,0
  PRODUCTVERSION    LZ4_VERSION_MAJOR,LZ4_VERSION_MINOR,LZ4_VERSION_RELEASE,0
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 FILEFLAGS VS_FF_DEBUG
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 FILEFLAGS 0x0L
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 FILEOS VOS_NT_WINDOWS32
 FILETYPE VFT_DLL
 FILESUBTYPE VFT2_UNKNOWN
 BEGIN
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    END
 END
 #endif
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  <Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
  <ImportGroup Label="ExtensionTargets">
  </ImportGroup>
 </Project>
--- a/build/VS2022/lz4.sln
+++ b/build/VS2022/lz4.sln
@ -0,0 +1,103 @@
 Microsoft Visual Studio Solution File, Format Version 12.00
 # Visual Studio 15
 VisualStudioVersion = 15.0.28307.271
 MinimumVisualStudioVersion = 10.0.40219.1
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "liblz4-dll", "liblz4-dll\liblz4-dll.vcxproj", "{9800039D-4AAA-43A4-BB78-FEF6F4836927}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "liblz4", "liblz4\liblz4.vcxproj", "{9092C5CC-3E71-41B3-BF68-4A7BDD8A5476}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "fuzzer", "fuzzer\fuzzer.vcxproj", "{18B9F1A7-9C66-4352-898B-30804DADE0FD}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "fullbench", "fullbench\fullbench.vcxproj", "{6A4DF4EF-C77F-43C6-8901-DDCD20879E4E}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "frametest", "frametest\frametest.vcxproj", "{39AD6ECC-8BAD-4368-95E4-A1AA2F077BB7}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "datagen", "datagen\datagen.vcxproj", "{D745AE2F-596A-403A-9B91-81A8C6779243}"
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "fullbench-dll", "fullbench-dll\fullbench-dll.vcxproj", "{13992FD2-077E-4954-B065-A428198201A9}"
 	ProjectSection(ProjectDependencies) = postProject
 		{9800039D-4AAA-43A4-BB78-FEF6F4836927} = {9800039D-4AAA-43A4-BB78-FEF6F4836927}
 	EndProjectSection
 EndProject
 Project("{8BC9CEB8-8B4A-11D0-8D11-00A0C91BC942}") = "lz4", "lz4\lz4.vcxproj", "{60A3115E-B988-41EE-8815-F4D4F253D866}"
 EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Win32 = Debug|Win32
 		Debug|x64 = Debug|x64
 		Release|Win32 = Release|Win32
 		Release|x64 = Release|x64
 	EndGlobalSection
 	GlobalSection(ProjectConfigurationPlatforms) = postSolution
 		{9800039D-4AAA-43A4-BB78-FEF6F4836927}.Debug|Win32.ActiveCfg = Debug|Win32
 		{9800039D-4AAA-43A4-BB78-FEF6F4836927}.Debug|Win32.Build.0 = Debug|Win32
 		{9800039D-4AAA-43A4-BB78-FEF6F4836927}.Debug|x64.ActiveCfg = Debug|x64
 		{9800039D-4AAA-43A4-BB78-FEF6F4836927}.Debug|x64.Build.0 = Debug|x64
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 		{9092C5CC-3E71-41B3-BF68-4A7BDD8A5476}.Debug|Win32.Build.0 = Debug|Win32
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 		{18B9F1A7-9C66-4352-898B-30804DADE0FD}.Debug|Win32.ActiveCfg = Debug|Win32
 		{18B9F1A7-9C66-4352-898B-30804DADE0FD}.Debug|Win32.Build.0 = Debug|Win32
 		{18B9F1A7-9C66-4352-898B-30804DADE0FD}.Debug|x64.ActiveCfg = Debug|x64
 		{18B9F1A7-9C66-4352-898B-30804DADE0FD}.Debug|x64.Build.0 = Debug|x64
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 		{6A4DF4EF-C77F-43C6-8901-DDCD20879E4E}.Debug|Win32.Build.0 = Debug|Win32
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 		{6A4DF4EF-C77F-43C6-8901-DDCD20879E4E}.Debug|x64.Build.0 = Debug|x64
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 		{6A4DF4EF-C77F-43C6-8901-DDCD20879E4E}.Release|x64.Build.0 = Release|x64
 		{39AD6ECC-8BAD-4368-95E4-A1AA2F077BB7}.Debug|Win32.ActiveCfg = Debug|Win32
 		{39AD6ECC-8BAD-4368-95E4-A1AA2F077BB7}.Debug|Win32.Build.0 = Debug|Win32
 		{39AD6ECC-8BAD-4368-95E4-A1AA2F077BB7}.Debug|x64.ActiveCfg = Debug|x64
 		{39AD6ECC-8BAD-4368-95E4-A1AA2F077BB7}.Debug|x64.Build.0 = Debug|x64
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 		{D745AE2F-596A-403A-9B91-81A8C6779243}.Debug|Win32.ActiveCfg = Debug|Win32
 		{D745AE2F-596A-403A-9B91-81A8C6779243}.Debug|Win32.Build.0 = Debug|Win32
 		{D745AE2F-596A-403A-9B91-81A8C6779243}.Debug|x64.ActiveCfg = Debug|x64
 		{D745AE2F-596A-403A-9B91-81A8C6779243}.Debug|x64.Build.0 = Debug|x64
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 		{D745AE2F-596A-403A-9B91-81A8C6779243}.Release|Win32.Build.0 = Release|Win32
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 		{13992FD2-077E-4954-B065-A428198201A9}.Debug|Win32.Build.0 = Debug|Win32
 		{13992FD2-077E-4954-B065-A428198201A9}.Debug|x64.ActiveCfg = Debug|x64
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 		{13992FD2-077E-4954-B065-A428198201A9}.Release|Win32.Build.0 = Release|Win32
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 		{13992FD2-077E-4954-B065-A428198201A9}.Release|x64.Build.0 = Release|x64
 		{60A3115E-B988-41EE-8815-F4D4F253D866}.Debug|Win32.ActiveCfg = Debug|Win32
 		{60A3115E-B988-41EE-8815-F4D4F253D866}.Debug|Win32.Build.0 = Debug|Win32
 		{60A3115E-B988-41EE-8815-F4D4F253D866}.Debug|x64.ActiveCfg = Debug|x64
 		{60A3115E-B988-41EE-8815-F4D4F253D866}.Debug|x64.Build.0 = Debug|x64
 		{60A3115E-B988-41EE-8815-F4D4F253D866}.Release|Win32.ActiveCfg = Release|Win32
 		{60A3115E-B988-41EE-8815-F4D4F253D866}.Release|Win32.Build.0 = Release|Win32
 		{60A3115E-B988-41EE-8815-F4D4F253D866}.Release|x64.ActiveCfg = Release|x64
 		{60A3115E-B988-41EE-8815-F4D4F253D866}.Release|x64.Build.0 = Release|x64
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {BBC259B2-BABF-47CD-8A6A-7B8318A803AC}
 	EndGlobalSection
 EndGlobal
--- a/build/cmake/.gitignore
+++ b/build/cmake/.gitignore
@ -0,0 +1,10 @@
 # cmake build artefact
 CMakeCache.txt
 CMakeFiles
 *.cmake
 Makefile
 liblz4.pc
 lz4c
 install_manifest.txt
 build
--- a/build/cmake/CMakeLists.txt
+++ b/build/cmake/CMakeLists.txt
@ -0,0 +1,273 @@
 # CMake support for LZ4
 #
 # To the extent possible under law, the author(s) have dedicated all
 # copyright and related and neighboring rights to this software to
 # the public domain worldwide. This software is distributed without
 # any warranty.
 #
 # For details, see <http://creativecommons.org/publicdomain/zero/1.0/>.
 #
 # LZ4's CMake support is maintained by Evan Nemerson; when filing
 # bugs please mention @nemequ to make sure I see it.
 cmake_minimum_required(VERSION 2.8.12)
 set(LZ4_TOP_SOURCE_DIR "${CMAKE_CURRENT_SOURCE_DIR}/../..")
 # Parse version information
 file(STRINGS "${LZ4_TOP_SOURCE_DIR}/lib/lz4.h" LZ4_VERSION_MAJOR REGEX "^#define LZ4_VERSION_MAJOR +([0-9]+) +.*$")
 string(REGEX REPLACE "^#define LZ4_VERSION_MAJOR +([0-9]+) +.*$" "\\1" LZ4_VERSION_MAJOR "${LZ4_VERSION_MAJOR}")
 file(STRINGS "${LZ4_TOP_SOURCE_DIR}/lib/lz4.h" LZ4_VERSION_MINOR REGEX "^#define LZ4_VERSION_MINOR +([0-9]+) +.*$")
 string(REGEX REPLACE "^#define LZ4_VERSION_MINOR +([0-9]+) +.*$" "\\1" LZ4_VERSION_MINOR "${LZ4_VERSION_MINOR}")
 file(STRINGS "${LZ4_TOP_SOURCE_DIR}/lib/lz4.h" LZ4_VERSION_RELEASE REGEX "^#define LZ4_VERSION_RELEASE +([0-9]+) +.*$")
 string(REGEX REPLACE "^#define LZ4_VERSION_RELEASE +([0-9]+) +.*$" "\\1" LZ4_VERSION_RELEASE "${LZ4_VERSION_RELEASE}")
 set(LZ4_VERSION_STRING "${LZ4_VERSION_MAJOR}.${LZ4_VERSION_MINOR}.${LZ4_VERSION_RELEASE}")
 mark_as_advanced(LZ4_VERSION_STRING LZ4_VERSION_MAJOR LZ4_VERSION_MINOR LZ4_VERSION_RELEASE)
 if("${CMAKE_VERSION}" VERSION_LESS "3.0")
  project(LZ4 C)
 else()
  cmake_policy (SET CMP0048 NEW)
  project(LZ4
    VERSION ${LZ4_VERSION_STRING}
    LANGUAGES C)
 endif()
 option(LZ4_BUILD_CLI "Build lz4 program" ON)
 option(LZ4_BUILD_LEGACY_LZ4C "Build lz4c program with legacy argument support" ON)
 # If LZ4 is being bundled in another project, we don't want to
 # install anything.  However, we want to let people override this, so
 # we'll use the LZ4_BUNDLED_MODE variable to let them do that; just
 # set it to OFF in your project before you add_subdirectory(lz4/contrib/cmake_unofficial).
 get_directory_property(LZ4_PARENT_DIRECTORY PARENT_DIRECTORY)
 if("${LZ4_BUNDLED_MODE}" STREQUAL "")
  # Bundled mode hasn't been set one way or the other, set the default
  # depending on whether or not we are the top-level project.
  if("${LZ4_PARENT_DIRECTORY}" STREQUAL "")
    set(LZ4_BUNDLED_MODE OFF)
  else()
    set(LZ4_BUNDLED_MODE ON)
  endif()
 endif()
 mark_as_advanced(LZ4_BUNDLED_MODE)
 # CPack
 if(NOT LZ4_BUNDLED_MODE AND NOT CPack_CMake_INCLUDED)
  set(CPACK_PACKAGE_DESCRIPTION_SUMMARY "LZ4 compression library")
  set(CPACK_PACKAGE_DESCRIPTION_FILE "${LZ4_TOP_SOURCE_DIR}/README.md")
  set(CPACK_RESOURCE_FILE_LICENSE "${LZ4_TOP_SOURCE_DIR}/LICENSE")
  set(CPACK_PACKAGE_VERSION_MAJOR ${LZ4_VERSION_MAJOR})
  set(CPACK_PACKAGE_VERSION_MINOR ${LZ4_VERSION_MINOR})
  set(CPACK_PACKAGE_VERSION_PATCH ${LZ4_VERSION_RELEASE})
  include(CPack)
 endif(NOT LZ4_BUNDLED_MODE AND NOT CPack_CMake_INCLUDED)
 # Allow people to choose whether to build shared or static libraries
 # via the BUILD_SHARED_LIBS option unless we are in bundled mode, in
 # which case we always use static libraries.
 include(CMakeDependentOption)
 CMAKE_DEPENDENT_OPTION(BUILD_SHARED_LIBS "Build shared libraries" ON "NOT LZ4_BUNDLED_MODE" OFF)
 CMAKE_DEPENDENT_OPTION(BUILD_STATIC_LIBS "Build static libraries" OFF "BUILD_SHARED_LIBS" ON)
 if(NOT BUILD_SHARED_LIBS AND NOT BUILD_STATIC_LIBS)
  message(FATAL_ERROR "Both BUILD_SHARED_LIBS and BUILD_STATIC_LIBS have been disabled")
 endif()
 set(LZ4_LIB_SOURCE_DIR "${LZ4_TOP_SOURCE_DIR}/lib")
 set(LZ4_PROG_SOURCE_DIR "${LZ4_TOP_SOURCE_DIR}/programs")
 include_directories("${LZ4_LIB_SOURCE_DIR}")
 # CLI sources
 set(LZ4_SOURCES
  "${LZ4_LIB_SOURCE_DIR}/lz4.c"
  "${LZ4_LIB_SOURCE_DIR}/lz4hc.c"
  "${LZ4_LIB_SOURCE_DIR}/lz4.h"
  "${LZ4_LIB_SOURCE_DIR}/lz4hc.h"
  "${LZ4_LIB_SOURCE_DIR}/lz4frame.c"
  "${LZ4_LIB_SOURCE_DIR}/lz4frame.h"
  "${LZ4_LIB_SOURCE_DIR}/xxhash.c")
 set(LZ4_CLI_SOURCES
  "${LZ4_PROG_SOURCE_DIR}/bench.c"
  "${LZ4_PROG_SOURCE_DIR}/lz4cli.c"
  "${LZ4_PROG_SOURCE_DIR}/lz4io.c"
  "${LZ4_PROG_SOURCE_DIR}/datagen.c")
 # Whether to use position independent code for the static library.  If
 # we're building a shared library this is ignored and PIC is always
 # used.
 option(LZ4_POSITION_INDEPENDENT_LIB "Use position independent code for static library (if applicable)" ON)
 # liblz4
 set(LZ4_LIBRARIES_BUILT)
 if(BUILD_SHARED_LIBS)
  add_library(lz4_shared SHARED ${LZ4_SOURCES})
  target_include_directories(lz4_shared
    PUBLIC $<BUILD_INTERFACE:${LZ4_LIB_SOURCE_DIR}>
    INTERFACE $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
  set_target_properties(lz4_shared PROPERTIES
    OUTPUT_NAME lz4
    SOVERSION "${LZ4_VERSION_MAJOR}"
    VERSION "${LZ4_VERSION_STRING}")
  if(MSVC)
    target_compile_definitions(lz4_shared PRIVATE
      LZ4_DLL_EXPORT=1)
  endif()
  list(APPEND LZ4_LIBRARIES_BUILT lz4_shared)
 endif()
 if(BUILD_STATIC_LIBS)
  set(STATIC_LIB_NAME lz4)
  if (MSVC AND BUILD_SHARED_LIBS)
    set(STATIC_LIB_NAME lz4_static)
  endif()
  add_library(lz4_static STATIC ${LZ4_SOURCES})
  target_include_directories(lz4_static
    PUBLIC $<BUILD_INTERFACE:${LZ4_LIB_SOURCE_DIR}>
    INTERFACE $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>)
  set_target_properties(lz4_static PROPERTIES
    OUTPUT_NAME ${STATIC_LIB_NAME}
    POSITION_INDEPENDENT_CODE ${LZ4_POSITION_INDEPENDENT_LIB})
  list(APPEND LZ4_LIBRARIES_BUILT lz4_static)
 endif()
 if(BUILD_STATIC_LIBS)
  set(LZ4_LINK_LIBRARY lz4_static)
 else()
  list(APPEND LZ4_CLI_SOURCES ${LZ4_SOURCES})
 endif()
 # lz4
 if (LZ4_BUILD_CLI)
  set(LZ4_PROGRAMS_BUILT lz4cli)
  add_executable(lz4cli ${LZ4_CLI_SOURCES})
  set_target_properties(lz4cli PROPERTIES OUTPUT_NAME lz4)
  if (BUILD_STATIC_LIBS)
    target_link_libraries(lz4cli ${LZ4_LINK_LIBRARY})
  endif()
 endif()
 # lz4c
 if (LZ4_BUILD_LEGACY_LZ4C)
  list(APPEND LZ4_PROGRAMS_BUILT lz4c)
  add_executable(lz4c ${LZ4_CLI_SOURCES})
  set_target_properties(lz4c PROPERTIES COMPILE_DEFINITIONS "ENABLE_LZ4C_LEGACY_OPTIONS")
  if (BUILD_STATIC_LIBS)
    target_link_libraries(lz4c ${LZ4_LINK_LIBRARY})
  endif()
 endif()
 # Extra warning flags
 include (CheckCCompilerFlag)
 foreach (flag
    # GCC-style
    -Wall
    -Wextra
    -Wundef
    -Wcast-qual
    -Wcast-align
    -Wshadow
    -Wswitch-enum
    -Wdeclaration-after-statement
    -Wstrict-prototypes
    -Wpointer-arith
    # MSVC-style
    /W4)
  # Because https://gcc.gnu.org/wiki/FAQ#wnowarning
  string(REGEX REPLACE "\\-Wno\\-(.+)" "-W\\1" flag_to_test "${flag}")
  string(REGEX REPLACE "[^a-zA-Z0-9]+" "_" test_name "CFLAG_${flag_to_test}")
  check_c_compiler_flag("${ADD_COMPILER_FLAGS_PREPEND} ${flag_to_test}" ${test_name})
  if(${test_name})
    set(CMAKE_C_FLAGS "${flag} ${CMAKE_C_FLAGS}")
  endif()
  unset(test_name)
  unset(flag_to_test)
 endforeach (flag)
 if(NOT LZ4_BUNDLED_MODE)
  include(GNUInstallDirs)
  install(TARGETS ${LZ4_PROGRAMS_BUILT}
    BUNDLE	DESTINATION "${CMAKE_INSTALL_BINDIR}"
    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
  install(TARGETS ${LZ4_LIBRARIES_BUILT}
    EXPORT lz4Targets
    LIBRARY DESTINATION "${CMAKE_INSTALL_LIBDIR}"
    ARCHIVE DESTINATION "${CMAKE_INSTALL_LIBDIR}"
    RUNTIME DESTINATION "${CMAKE_INSTALL_BINDIR}")
  install(FILES
    "${LZ4_LIB_SOURCE_DIR}/lz4.h"
    "${LZ4_LIB_SOURCE_DIR}/lz4frame.h"
    "${LZ4_LIB_SOURCE_DIR}/lz4hc.h"
    DESTINATION "${CMAKE_INSTALL_INCLUDEDIR}")
  install(FILES "${LZ4_PROG_SOURCE_DIR}/lz4.1"
    DESTINATION "${CMAKE_INSTALL_MANDIR}/man1")
  install(FILES "${CMAKE_CURRENT_BINARY_DIR}/liblz4.pc"
    DESTINATION "${CMAKE_INSTALL_LIBDIR}/pkgconfig")
  include(CMakePackageConfigHelpers)
  write_basic_package_version_file(
    "${CMAKE_CURRENT_BINARY_DIR}/lz4ConfigVersion.cmake"
    VERSION ${LZ4_VERSION_STRING}
    COMPATIBILITY SameMajorVersion)
  set(LZ4_PKG_INSTALLDIR "${CMAKE_INSTALL_LIBDIR}/cmake/lz4")
  configure_package_config_file(
    "${CMAKE_CURRENT_LIST_DIR}/lz4Config.cmake.in"
    "${CMAKE_CURRENT_BINARY_DIR}/lz4Config.cmake"
    INSTALL_DESTINATION ${LZ4_PKG_INSTALLDIR})
  export(EXPORT lz4Targets
    FILE ${CMAKE_CURRENT_BINARY_DIR}/lz4Targets.cmake
    NAMESPACE LZ4::)
  install(EXPORT lz4Targets
    FILE lz4Targets.cmake
    NAMESPACE LZ4::
    DESTINATION ${LZ4_PKG_INSTALLDIR})
  install(FILES
      ${CMAKE_CURRENT_BINARY_DIR}/lz4Config.cmake
      ${CMAKE_CURRENT_BINARY_DIR}/lz4ConfigVersion.cmake
    DESTINATION ${LZ4_PKG_INSTALLDIR})
  # install lz4cat and unlz4 symlinks on *nix
  if(UNIX AND LZ4_BUILD_CLI)
    install(CODE "
      foreach(f lz4cat unlz4)
        set(dest \"\$ENV{DESTDIR}${CMAKE_INSTALL_FULL_BINDIR}/\${f}\")
        message(STATUS \"Symlinking: \${dest} -> lz4\")
        execute_process(
          COMMAND \"${CMAKE_COMMAND}\" -E create_symlink lz4 \"\${dest}\")
      endforeach()
    ")
    # create manpage aliases
    foreach(f lz4cat unlz4)
      file(WRITE "${CMAKE_CURRENT_BINARY_DIR}/${f}.1" ".so man1/lz4.1\n")
      install(FILES "${CMAKE_CURRENT_BINARY_DIR}/${f}.1"
        DESTINATION "${CMAKE_INSTALL_MANDIR}/man1")
    endforeach()
  endif(UNIX AND LZ4_BUILD_CLI)
 endif(NOT LZ4_BUNDLED_MODE)
 # pkg-config
 set(PREFIX "${CMAKE_INSTALL_PREFIX}")
 if("${CMAKE_INSTALL_FULL_LIBDIR}" STREQUAL "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_LIBDIR}")
  set(LIBDIR "\${prefix}/${CMAKE_INSTALL_LIBDIR}")
 else()
  set(LIBDIR "${CMAKE_INSTALL_FULL_LIBDIR}")
 endif()
 if("${CMAKE_INSTALL_FULL_INCLUDEDIR}" STREQUAL "${CMAKE_INSTALL_PREFIX}/${CMAKE_INSTALL_INCLUDEDIR}")
  set(INCLUDEDIR "\${prefix}/${CMAKE_INSTALL_INCLUDEDIR}")
 else()
  set(INCLUDEDIR "${CMAKE_INSTALL_FULL_INCLUDEDIR}")
 endif()
 # for liblz4.pc substitution
 set(VERSION ${LZ4_VERSION_STRING})
 configure_file(${LZ4_LIB_SOURCE_DIR}/liblz4.pc.in liblz4.pc @ONLY)
--- a/build/cmake/lz4Config.cmake.in
+++ b/build/cmake/lz4Config.cmake.in
@ -0,0 +1,2 @@
@PACKAGE_INIT@
 include( "${CMAKE_CURRENT_LIST_DIR}/lz4Targets.cmake" )
--- a/contrib/debian/changelog
+++ b/contrib/debian/changelog
@ -0,0 +1,10 @@
 liblz4 (1.7.2) unstable; urgency=low
  * Changed : moved to versioning; package, cli and library have same version number
  * Improved: Small decompression speed boost (+4%)
  * Improved: Performance on ARMv6 and ARMv7
  * Added : Debianization, by Evgeniy Polyakov
  * Makefile: Generates object files (*.o) for faster (re)compilation on low power systems
  * Fix : cli : crash on some invalid inputs
 -- Yann Collet <Cyan4973@github.com>  Sun, 28 Jun 2015 01:00:00 +0000
--- a/contrib/debian/compat
+++ b/contrib/debian/compat
@ -0,0 +1 @@
 7
--- a/contrib/debian/control
+++ b/contrib/debian/control
@ -0,0 +1,23 @@
 Source: liblz4
 Section: devel
 Priority: optional
 Maintainer: Evgeniy Polyakov <zbr@ioremap.net>
 Build-Depends:
 cmake (>= 2.6),
 debhelper (>= 7.0.50~),
 cdbs
 Standards-Version: 3.8.0
 Homepage: http://www.lz4.org/
 Vcs-Git: git://github.com/lz4/lz4.git
 Vcs-Browser: https://github.com/lz4/lz4
 Package: liblz4
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
 Description: Extremely Fast Compression algorithm http://www.lz4.org
 Package: liblz4-dev
 Architecture: any
 Depends: ${shlibs:Depends}, ${misc:Depends}
 Description: Extremely Fast Compression algorithm http://www.lz4.org
 Development files.
--- a/contrib/debian/copyright
+++ b/contrib/debian/copyright
@ -0,0 +1,9 @@
 Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: liblz4
 Upstream-Contact: Yann Collet <Cyan4973@github.com>
 Source: https://github.com/lz4/lz4
 Files: *
 Copyright: (C) 2011-2020 Yann Collet
 License: GPL-2+
 The full text of license: https://github.com/lz4/lz4/blob/dev/lib/LICENSE
--- a/contrib/debian/dirs
+++ b/contrib/debian/dirs
@ -0,0 +1 @@
 usr/bin
--- a/contrib/debian/docs
+++ b/contrib/debian/docs
--- a/contrib/debian/liblz4-dev.install
+++ b/contrib/debian/liblz4-dev.install
@ -0,0 +1,2 @@
 usr/include/lz4*
 usr/lib/liblz4.so
--- a/contrib/debian/liblz4.install
+++ b/contrib/debian/liblz4.install
@ -0,0 +1,2 @@
 usr/lib/liblz4.so.*
 usr/bin/*
--- a/contrib/debian/rules
+++ b/contrib/debian/rules
@ -0,0 +1,7 @@
 #!/usr/bin/make -f
 include /usr/share/cdbs/1/rules/debhelper.mk
 include /usr/share/cdbs/1/class/cmake.mk
 DEB_CMAKE_EXTRA_FLAGS := -DCMAKE_BUILD_TYPE=RelWithDebInfo ../../build/cmake
--- a/contrib/djgpp/LICENSE
+++ b/contrib/djgpp/LICENSE
@ -0,0 +1,24 @@
 Copyright (c) 2014, lpsantil
 All rights reserved.
 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 HOLDER 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.
--- a/contrib/djgpp/Makefile
+++ b/contrib/djgpp/Makefile
@ -0,0 +1,130 @@
 # Copyright (c) 2015, Louis P. Santillan <lpsantil@gmail.com>
 # All rights reserved.
 # See LICENSE for licensing details.
 DESTDIR ?= /opt/local
 # Pulled the code below from lib/Makefile.  Might be nicer to derive this somehow without sed
 # Version numbers
 VERSION ?= 129
 RELEASE ?= r$(VERSION)
 LIBVER_MAJOR=$(shell sed -n '/define LZ4_VERSION_MAJOR/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < lib/lz4.h)
 LIBVER_MINOR=$(shell sed -n '/define LZ4_VERSION_MINOR/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < lib/lz4.h)
 LIBVER_PATCH=$(shell sed -n '/define LZ4_VERSION_RELEASE/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < lib/lz4.h)
 LIBVER=$(LIBVER_MAJOR).$(LIBVER_MINOR).$(LIBVER_PATCH)
 ######################################################################
 CROSS ?= i586-pc-msdosdjgpp
 CC = $(CROSS)-gcc
 AR = $(CROSS)-ar
 LD = $(CROSS)-gcc
 CFLAGS ?= -O3 -std=gnu99 -Wall -Wextra -Wundef -Wshadow -Wcast-qual -Wcast-align -Wstrict-prototypes -pedantic -DLZ4_VERSION=\"$(RELEASE)\"
 LDFLAGS ?= -s
 SRC = programs/bench.c programs/lz4io.c programs/lz4cli.c
 OBJ = $(SRC:.c=.o)
 SDEPS = $(SRC:.c=.d)
 IDIR = lib
 EDIR = .
 EXE = lz4.exe
 LNK = lz4
 LDIR = lib
 LSRC = lib/lz4.c lib/lz4hc.c lib/lz4frame.c lib/xxhash.c
 INC = $(LSRC:.c=.h)
 LOBJ = $(LSRC:.c=.o)
 LSDEPS = $(LSRC:.c=.d)
 LIB = $(LDIR)/lib$(LNK).a
 # Since LDFLAGS defaults to "-s", probably better to override unless
 # you have a default you would like to maintain
 ifeq ($(WITH_DEBUG), 1)
 	CFLAGS += -g
 	LDFLAGS += -g
 endif
 # Since LDFLAGS defaults to "-s", probably better to override unless
 # you have a default you would like to maintain
 ifeq ($(WITH_PROFILING), 1)
 	CFLAGS += -pg
 	LDFLAGS += -pg
 endif
 %.o: %.c $(INC) Makefile
 	$(CC) $(CFLAGS) -MMD -MP -I$(IDIR) -c $< -o $@
 %.exe: %.o $(LIB) Makefile
 	$(LD) $< -L$(LDIR) -l$(LNK) $(LDFLAGS) $(LIBDEP) -o $@
 ######################################################################
 ######################## DO NOT MODIFY BELOW #########################
 ######################################################################
 .PHONY: all install uninstall showconfig gstat gpush
 all: $(LIB) $(EXE)
 $(LIB): $(LOBJ)
 	$(AR) -rcs $@ $^
 $(EXE): $(LOBJ) $(OBJ)
 	$(LD) $(LDFLAGS) $(LOBJ) $(OBJ) -o $(EDIR)/$@
 clean:
 	rm -f $(OBJ) $(EXE) $(LOBJ) $(LIB) *.tmp $(SDEPS) $(LSDEPS) $(TSDEPS)
 install: $(INC) $(LIB) $(EXE)
 	mkdir -p $(DESTDIR)/bin $(DESTDIR)/include $(DESTDIR)/lib
 	rm -f .footprint
 	echo $(DESTDIR)/bin/$(EXE) >> .footprint
 	cp -v $(EXE) $(DESTDIR)/bin/
 	@for T in $(LIB); \
 	do ( \
 		echo $(DESTDIR)/$$T >> .footprint; \
 		cp -v --parents $$T $(DESTDIR) \
 	); done
 	@for T in $(INC); \
 	do ( \
 		echo $(DESTDIR)/include/`basename -a $$T` >> .footprint; \
 		cp -v $$T $(DESTDIR)/include/ \
 	); done
 uninstall: .footprint
 	@for T in $(shell cat .footprint); do rm -v $$T; done
 -include $(SDEPS) $(LSDEPS)
 showconfig:
 	@echo "PWD="$(PWD)
 	@echo "VERSION="$(VERSION)
 	@echo "RELEASE="$(RELEASE)
 	@echo "LIBVER_MAJOR="$(LIBVER_MAJOR)
 	@echo "LIBVER_MINOR="$(LIBVER_MINOR)
 	@echo "LIBVER_PATCH="$(LIBVER_PATCH)
 	@echo "LIBVER="$(LIBVER)
 	@echo "CROSS="$(CROSS)
 	@echo "CC="$(CC)
 	@echo "AR="$(AR)
 	@echo "LD="$(LD)
 	@echo "DESTDIR="$(DESTDIR)
 	@echo "CFLAGS="$(CFLAGS)
 	@echo "LDFLAGS="$(LDFLAGS)
 	@echo "SRC="$(SRC)
 	@echo "OBJ="$(OBJ)
 	@echo "IDIR="$(IDIR)
 	@echo "INC="$(INC)
 	@echo "EDIR="$(EDIR)
 	@echo "EXE="$(EXE)
 	@echo "LDIR="$(LDIR)
 	@echo "LSRC="$(LSRC)
 	@echo "LOBJ="$(LOBJ)
 	@echo "LNK="$(LNK)
 	@echo "LIB="$(LIB)
 	@echo "SDEPS="$(SDEPS)
 	@echo "LSDEPS="$(LSDEPS)
 gstat:
 	git status
 gpush:
 	git commit
 	git push
--- a/contrib/djgpp/README.MD
+++ b/contrib/djgpp/README.MD
@ -0,0 +1,21 @@
 # lz4 for DOS/djgpp
 This file details on how to compile lz4.exe, and liblz4.a for use on DOS/djgpp using
 Andrew Wu's build-djgpp cross compilers ([GH][0], [Binaries][1]) on OSX, Linux.
 ## Setup
 * Download a djgpp tarball [binaries][1] for your platform.  
 * Extract and install it (`tar jxvf djgpp-linux64-gcc492.tar.bz2`).  Note the path.  We'll assume `/home/user/djgpp`.
 * Add the `bin` folder to your `PATH`.  In bash, do `export PATH=/home/user/djgpp/bin:$PATH`.
 * The `Makefile` in `contrib/djgpp/` sets up `CC`, `AR`, `LD` for you.  So, `CC=i586-pc-msdosdjgpp-gcc`, `AR=i586-pc-msdosdjgpp-ar`, `LD=i586-pc-msdosdjgpp-gcc`.
 ## Building LZ4 for DOS
 In the base dir of lz4 and with `contrib/djgpp/Makefile`, try:
 Try:
 * `make -f contrib/djgpp/Makefile`
 * `make -f contrib/djgpp/Makefile liblz4.a`
 * `make -f contrib/djgpp/Makefile lz4.exe`
 * `make -f contrib/djgpp/Makefile DESTDIR=/home/user/dos install`, however it doesn't make much sense on a \*nix.
 * You can also do `make -f contrib/djgpp/Makefile uninstall`
 [0]: https://github.com/andrewwutw/build-djgpp
 [1]: https://github.com/andrewwutw/build-djgpp/releases
--- a/contrib/gen_manual/.gitignore
+++ b/contrib/gen_manual/.gitignore
@ -0,0 +1,2 @@
 # build artefact
 gen_manual
--- a/contrib/gen_manual/Makefile
+++ b/contrib/gen_manual/Makefile
@ -0,0 +1,76 @@
 # ################################################################
 # Copyright (C) Przemyslaw Skibinski 2016-present
 # All rights reserved.
 #
 # BSD license
 # 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 HOLDER 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.
 #
 # You can contact the author at :
 #  - LZ4 source repository : https://github.com/Cyan4973/lz4
 #  - LZ4 forum froup : https://groups.google.com/forum/#!forum/lz4c
 # ################################################################
 CXXFLAGS ?= -O2
 CXXFLAGS += -Wall -Wextra -Wcast-qual -Wcast-align -Wshadow -Wstrict-aliasing=1 -Wswitch-enum -Wno-comment
 CPPFLAGS += $(MOREFLAGS)
 FLAGS   = $(CXXFLAGS) $(CPPFLAGS) $(LDFLAGS)
 LZ4API = ../../lib/lz4.h
 LZ4MANUAL = ../../doc/lz4_manual.html
 LZ4FAPI = ../../lib/lz4frame.h
 LZ4FMANUAL = ../../doc/lz4frame_manual.html
 LIBVER_MAJOR_SCRIPT:=`sed -n '/define LZ4_VERSION_MAJOR/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < $(LZ4API)`
 LIBVER_MINOR_SCRIPT:=`sed -n '/define LZ4_VERSION_MINOR/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < $(LZ4API)`
 LIBVER_PATCH_SCRIPT:=`sed -n '/define LZ4_VERSION_RELEASE/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < $(LZ4API)`
 LIBVER_SCRIPT:= $(LIBVER_MAJOR_SCRIPT).$(LIBVER_MINOR_SCRIPT).$(LIBVER_PATCH_SCRIPT)
 LZ4VER := $(shell echo $(LIBVER_SCRIPT))
 # Define *.exe as extension for Windows systems
 ifneq (,$(filter Windows%,$(OS)))
 EXT =.exe
 else
 EXT =
 endif
 .PHONY: default
 default: gen_manual
 gen_manual: gen_manual.cpp
 	$(CXX) $(FLAGS) $^ -o $@$(EXT)
 $(LZ4MANUAL) : gen_manual $(LZ4API)
 	echo "Update lz4 manual in /doc"
 	./gen_manual $(LZ4VER) $(LZ4API) $@
 $(LZ4FMANUAL) : gen_manual $(LZ4FAPI)
 	echo "Update lz4frame manual in /doc"
 	./gen_manual $(LZ4VER) $(LZ4FAPI) $@
 .PHONY: manuals
 manuals: $(LZ4MANUAL) $(LZ4FMANUAL)
 .PHONY: clean
 clean:
 	@$(RM) gen_manual$(EXT)
 	@echo Cleaning completed
--- a/contrib/gen_manual/README.md
+++ b/contrib/gen_manual/README.md
@ -0,0 +1,31 @@
 gen_manual - a program for automatic generation of manual from source code
 ==========================================================================
 #### Introduction
 This simple C++ program generates a single-page HTML manual from `lz4.h`.
 The format of recognized comment blocks is following:
 - comments of type `/*!` mean: this is a function declaration; switch comments with declarations
 - comments of type `/**` and `/*-` mean: this is a comment; use a `<H2>` header for the first line
 - comments of type `/*=` and `/**=` mean: use a `<H3>` header and show also all functions until first empty line
 - comments of type `/*X` where `X` is different from above-mentioned are ignored
 Moreover:
 - `LZ4LIB_API` is removed to improve readability
 - `typedef` are detected and included even if uncommented
 - comments of type `/**<` and `/*!<` are detected and only function declaration is highlighted (bold)
 #### Usage
 The program requires 3 parameters:
 ```
 gen_manual [lz4_version] [input_file] [output_html]
 ```
 To compile program and generate lz4 manual we have used:
 ```
 make
 ./gen_manual.exe 1.7.3 ../../lib/lz4.h lz4_manual.html
 ```
--- a/contrib/gen_manual/gen-lz4-manual.sh
+++ b/contrib/gen_manual/gen-lz4-manual.sh
@ -0,0 +1,10 @@
 #!/bin/sh
 LIBVER_MAJOR_SCRIPT=`sed -n '/define LZ4_VERSION_MAJOR/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < ../../lib/lz4.h`
 LIBVER_MINOR_SCRIPT=`sed -n '/define LZ4_VERSION_MINOR/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < ../../lib/lz4.h`
 LIBVER_PATCH_SCRIPT=`sed -n '/define LZ4_VERSION_RELEASE/s/.*[[:blank:]]\([0-9][0-9]*\).*/\1/p' < ../../lib/lz4.h`
 LIBVER_SCRIPT=$LIBVER_MAJOR_SCRIPT.$LIBVER_MINOR_SCRIPT.$LIBVER_PATCH_SCRIPT
 echo LZ4_VERSION=$LIBVER_SCRIPT
 ./gen_manual "lz4 $LIBVER_SCRIPT" ../../lib/lz4.h ./lz4_manual.html
 ./gen_manual "lz4frame $LIBVER_SCRIPT" ../../lib/lz4frame.h ./lz4frame_manual.html
--- a/contrib/gen_manual/gen_manual.cpp
+++ b/contrib/gen_manual/gen_manual.cpp
@ -0,0 +1,248 @@
 /*
 Copyright (c) 2016-present, Przemyslaw Skibinski
 All rights reserved.
 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.
 You can contact the author at :
 - LZ4 homepage : http://www.lz4.org
 - LZ4 source repository : https://github.com/lz4/lz4
 */
 #include <iostream>
 #include <fstream>
 #include <sstream>
 #include <vector>
 using namespace std;
 /* trim string at the beginning and at the end */
 void trim(string& s, string characters)
 {
    size_t p = s.find_first_not_of(characters);
    s.erase(0, p);
    p = s.find_last_not_of(characters);
    if (string::npos != p)
       s.erase(p+1);
 }
 /* trim C++ style comments */
 void trim_comments(string &s)
 {
    size_t spos, epos;
    spos = s.find("/*");
    epos = s.find("*/");
    s = s.substr(spos+3, epos-(spos+3));
 }
 /* get lines until a given terminator */
 vector<string> get_lines(vector<string>& input, int& linenum, string terminator)
 {
    vector<string> out;
    string line;
    while ((size_t)linenum < input.size()) {
        line = input[linenum];
        if (terminator.empty() && line.empty()) { linenum--; break; }
        size_t const epos = line.find(terminator);
        if (!terminator.empty() && epos!=string::npos) {
            out.push_back(line);
            break;
        }
        out.push_back(line);
        linenum++;
    }
    return out;
 }
 /* print line with LZ4LIB_API removed and C++ comments not bold */
 void print_line(stringstream &sout, string line)
 {
    size_t spos, epos;
    if (line.substr(0,11) == "LZ4LIB_API ") line = line.substr(11);
    if (line.substr(0,12) == "LZ4FLIB_API ") line = line.substr(12);
    spos = line.find("/*");
    epos = line.find("*/");
    if (spos!=string::npos && epos!=string::npos) {
        sout << line.substr(0, spos);
        sout << "</b>" << line.substr(spos) << "<b>" << '\n';
    } else {
        sout << line << '\n';
    }
 }
 int main(int argc, char *argv[]) {
    char exclam;
    int linenum, chapter = 1;
    vector<string> input, lines, comments, chapters;
    string line, version;
    size_t spos, l;
    stringstream sout;
    ifstream istream;
    ofstream ostream;
    if (argc < 4) {
        cout << "usage: " << argv[0] << " [lz4_version] [input_file] [output_html]" << endl;
        return 1;
    }
    version = string(argv[1]) + " Manual";
    istream.open(argv[2], ifstream::in);
    if (!istream.is_open()) {
        cout << "Error opening file " << argv[2] << endl;
        return 1;
    }
    ostream.open(argv[3], ifstream::out);
    if (!ostream.is_open()) {
        cout << "Error opening file " << argv[3] << endl;
        return 1;
   }
    while (getline(istream, line)) {
        input.push_back(line);
    }
    for (linenum=0; (size_t)linenum < input.size(); linenum++) {
        line = input[linenum];
        /* typedefs are detected and included even if uncommented */
        if (line.substr(0,7) == "typedef" && line.find("{")!=string::npos) {
            lines = get_lines(input, linenum, "}");
            sout << "<pre><b>";
            for (l=0; l<lines.size(); l++) {
                print_line(sout, lines[l]);
            }
            sout << "</b></pre><BR>" << endl;
            continue;
        }
        /* comments of type  / * * < and  / * ! <  are detected, and only function declaration is highlighted (bold) */
        if ((line.find("/**<")!=string::npos || line.find("/*!<")!=string::npos)
          && line.find("*/")!=string::npos) {
            sout << "<pre><b>";
            print_line(sout, line);
            sout << "</b></pre><BR>" << endl;
            continue;
        }
        spos = line.find("/**=");
        if (spos==string::npos) {
            spos = line.find("/*!");
            if (spos==string::npos)
                spos = line.find("/**");
            if (spos==string::npos)
                spos = line.find("/*-");
            if (spos==string::npos)
                spos = line.find("/*=");
            if (spos==string::npos)
                continue;
            exclam = line[spos+2];
        }
        else exclam = '=';
        comments = get_lines(input, linenum, "*/");
        if (!comments.empty()) comments[0] = line.substr(spos+3);
        if (!comments.empty())
            comments[comments.size()-1] = comments[comments.size()-1].substr(0, comments[comments.size()-1].find("*/"));
        for (l=0; l<comments.size(); l++) {
            if (comments[l].compare(0, 2, " *") == 0)
                comments[l] = comments[l].substr(2);
            else if (comments[l].compare(0, 3, "  *") == 0)
                comments[l] = comments[l].substr(3);
            trim(comments[l], "*-=");
        }
        while (!comments.empty() && comments[comments.size()-1].empty()) comments.pop_back(); // remove empty line at the end
        while (!comments.empty() && comments[0].empty()) comments.erase(comments.begin()); // remove empty line at the start
        /* comments of type  / * !  mean: this is a function declaration; switch comments with declarations */
        if (exclam == '!') {
            if (!comments.empty()) comments.erase(comments.begin()); /* remove first line like "LZ4_XXX() :" */
            linenum++;
            lines = get_lines(input, linenum, "");
            sout << "<pre><b>";
            for (l=0; l<lines.size(); l++) {
                print_line(sout, lines[l]);
            }
            sout << "</b><p>";
            for (l=0; l<comments.size(); l++) {
                print_line(sout, comments[l]);
            }
            sout << "</p></pre><BR>" << endl << endl;
        } else if (exclam == '=') { /* comments of type  / * =  and  / * * =  mean: use a <H3> header and show also all functions until first empty line */
            trim(comments[0], " ");
            sout << "<h3>" << comments[0] << "</h3><pre>";
            for (l=1; l<comments.size(); l++) {
                print_line(sout, comments[l]);
            }
            sout << "</pre><b><pre>";
            lines = get_lines(input, ++linenum, "");
            for (l=0; l<lines.size(); l++) {
                print_line(sout, lines[l]);
            }
            sout << "</pre></b><BR>" << endl;
        } else { /* comments of type  / * *  and  / * -  mean: this is a comment; use a <H2> header for the first line */
            if (comments.empty()) continue;
            trim(comments[0], " ");
            sout << "<a name=\"Chapter" << chapter << "\"></a><h2>" << comments[0] << "</h2><pre>";
            chapters.push_back(comments[0]);
            chapter++;
            for (l=1; l<comments.size(); l++) {
                print_line(sout, comments[l]);
            }
            if (comments.size() > 1)
                sout << "<BR></pre>" << endl << endl;
            else
                sout << "</pre>" << endl << endl;
        }
    }
    ostream << "<html>\n<head>\n<meta http-equiv=\"Content-Type\" content=\"text/html; charset=ISO-8859-1\">\n<title>" << version << "</title>\n</head>\n<body>" << endl;
    ostream << "<h1>" << version << "</h1>\n";
    ostream << "<hr>\n<a name=\"Contents\"></a><h2>Contents</h2>\n<ol>\n";
    for (size_t i=0; i<chapters.size(); i++)
        ostream << "<li><a href=\"#Chapter" << i+1 << "\">" << chapters[i].c_str() << "</a></li>\n";
    ostream << "</ol>\n<hr>\n";
    ostream << sout.str();
    ostream << "</html>" << endl << "</body>" << endl;
    return 0;
 }
--- a/contrib/meson/README.md
+++ b/contrib/meson/README.md
@ -0,0 +1,34 @@
 Meson build system for lz4
 ==========================
 Meson is a build system designed to optimize programmer productivity.
 It aims to do this by providing simple, out-of-the-box support for
 modern software development tools and practices, such as unit tests,
 coverage reports, Valgrind, CCache and the like.
 This Meson build system is provided with no guarantee.
 ## How to build
 `cd` to this meson directory (`contrib/meson`)
 ```sh
 meson setup --buildtype=release -Ddefault_library=shared -Dprograms=true builddir
 cd builddir
 ninja             # to build
 ninja install     # to install
 ```
 You might want to install it in staging directory:
 ```sh
 DESTDIR=./staging ninja install
 ```
 To configure build options, use:
 ```sh
 meson configure
 ```
 See [man meson(1)](https://manpages.debian.org/testing/meson/meson.1.en.html).
--- a/contrib/meson/meson.build
+++ b/contrib/meson/meson.build
@ -0,0 +1,27 @@
 # #############################################################################
 # Copyright (c) 2018-present    lzutao <taolzu(at)gmail.com>
 # 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 is a dummy meson file.
 # The intention is that it can be easily moved to the root of the project
 # (together with meson_options.txt) and packaged for wrapdb.
 project(
  'lz4',
  ['c'],
  license: 'BSD-2-Clause-Patent AND GPL-2.0-or-later',
  default_options: [
    'c_std=c99',
    'buildtype=release',
    'warning_level=3'
  ],
  version: 'DUMMY',
  meson_version: '>=0.49.0'
 )
 subdir('meson')
--- a/contrib/meson/meson/GetLz4LibraryVersion.py
+++ b/contrib/meson/meson/GetLz4LibraryVersion.py
@ -0,0 +1,39 @@
 #!/usr/bin/env python3
 # #############################################################################
 # Copyright (c) 2018-present    lzutao <taolzu(at)gmail.com>
 # 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).
 # #############################################################################
 import re
 def find_version_tuple(filepath):
  version_file_data = None
  with open(filepath) as fd:
    version_file_data = fd.read()
  patterns = r"""#\s*define\s+LZ4_VERSION_MAJOR\s+([0-9]+).*$
 #\s*define\s+LZ4_VERSION_MINOR\s+([0-9]+).*$
 #\s*define\s+LZ4_VERSION_RELEASE\s+([0-9]+).*$
 """
  regex = re.compile(patterns, re.MULTILINE)
  version_match = regex.search(version_file_data)
  if version_match:
    return version_match.groups()
  raise Exception("Unable to find version string.")
 def main():
  import argparse
  parser = argparse.ArgumentParser(description='Print lz4 version from lib/lz4.h')
  parser.add_argument('file', help='path to lib/lz4.h')
  args = parser.parse_args()
  version_tuple = find_version_tuple(args.file)
  print('.'.join(version_tuple))
 if __name__ == '__main__':
  main()
--- a/contrib/meson/meson/contrib/gen_manual/meson.build
+++ b/contrib/meson/meson/contrib/gen_manual/meson.build
@ -0,0 +1,42 @@
 # #############################################################################
 # Copyright (c) 2018-present        lzutao <taolzu(at)gmail.com>
 # Copyright (c) 2022-present        Tristan Partin <tristan(at)partin.io>
 # 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).
 # #############################################################################
 lz4_source_root = '../../../../..'
 add_languages('cpp')
 sources = files(
  lz4_source_root / 'contrib/gen_manual/gen_manual.cpp'
 )
 gen_manual = executable(
  'gen_manual',
  sources,
  native: true,
  install: false
 )
 manual_pages = ['lz4', 'lz4frame']
 foreach mp : manual_pages
  custom_target(
    '@0@_manual.html'.format(mp),
    build_by_default: true,
    input: lz4_source_root / 'lib/@0@.h'.format(mp),
    output: '@0@_manual.html'.format(mp),
    command: [
      gen_manual,
      lz4_version,
      '@INPUT@',
      '@OUTPUT@',
    ],
    install: false
  )
 endforeach
--- a/contrib/meson/meson/contrib/meson.build
+++ b/contrib/meson/meson/contrib/meson.build
@ -0,0 +1,11 @@
 # #############################################################################
 # Copyright (c) 2018-present        lzutao <taolzu(at)gmail.com>
 # Copyright (c) 2022-present        Tristan Partin <tristan(at)partin.io>
 # 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).
 # #############################################################################
 subdir('gen_manual')
--- a/contrib/meson/meson/examples/meson.build
+++ b/contrib/meson/meson/examples/meson.build
@ -0,0 +1,32 @@
 # #############################################################################
 # Copyright (c) 2018-present        lzutao <taolzu(at)gmail.com>
 # Copyright (c) 2022-present        Tristan Partin <tristan(at)partin.io>
 # 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).
 # #############################################################################
 lz4_source_root = '../../../..'
 examples = {
  'printVersion': 'printVersion.c',
  'doubleBuffer': 'blockStreaming_doubleBuffer.c',
  'dictionaryRandomAccess': 'dictionaryRandomAccess.c',
  'ringBuffer': 'blockStreaming_ringBuffer.c',
  'ringBufferHC': 'HCStreaming_ringBuffer.c',
  'lineCompress': 'blockStreaming_lineByLine.c',
  'frameCompress': 'frameCompress.c',
  'compressFunctions': 'compress_functions.c',
  'simpleBuffer': 'simple_buffer.c',
 }
 foreach e, src : examples
  executable(
    e,
    lz4_source_root / 'examples' / src,
    dependencies: [liblz4_internal_dep],
    install: false
  )
 endforeach
--- a/contrib/meson/meson/lib/meson.build
+++ b/contrib/meson/meson/lib/meson.build
@ -0,0 +1,76 @@
 # #############################################################################
 # Copyright (c) 2018-present        lzutao <taolzu(at)gmail.com>
 # Copyright (c) 2022-present        Tristan Partin <tristan(at)partin.io>
 # 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).
 # #############################################################################
 lz4_source_root = '../../../..'
 sources = files(
  lz4_source_root / 'lib/lz4.c',
  lz4_source_root / 'lib/lz4frame.c',
  lz4_source_root / 'lib/lz4hc.c',
  lz4_source_root / 'lib/xxhash.c'
 )
 c_args = []
 if host_machine.system() == 'windows' and get_option('default_library') != 'static'
  c_args += '-DLZ4_DLL_EXPORT=1'
 endif
 if get_option('unstable')
  compile_args += '-DLZ4_STATIC_LINKING_ONLY'
  if get_option('default_library') != 'static'
    c_args += '-DLZ4_PUBLISH_STATIC_FUNCTIONS'
  endif
 endif
 liblz4 = library(
  'lz4',
  sources,
  install: true,
  version: lz4_version,
  gnu_symbol_visibility: 'hidden'
 )
 liblz4_dep = declare_dependency(
  link_with: liblz4,
  include_directories: include_directories(lz4_source_root / 'lib')
 )
 if get_option('tests') or get_option('programs') or get_option('examples')
  liblz4_internal = static_library(
    'lz4-internal',
    objects: liblz4.extract_all_objects(recursive: true),
    gnu_symbol_visibility: 'hidden'
  )
  liblz4_internal_dep = declare_dependency(
    link_with: liblz4_internal,
    include_directories: include_directories(lz4_source_root / 'lib')
  )
 endif
 pkgconfig.generate(
  liblz4,
  name: 'lz4',
  filebase: 'liblz4',
  description: 'extremely fast lossless compression algorithm library',
  version: lz4_version,
  url: 'http://www.lz4.org/'
 )
 install_headers(
  lz4_source_root / 'lib/lz4.h',
  lz4_source_root / 'lib/lz4hc.h',
  lz4_source_root / 'lib/lz4frame.h'
 )
 if get_option('default_library') != 'shared'
  install_headers(lz4_source_root / 'lib/lz4frame_static.h')
 endif
--- a/contrib/meson/meson/meson.build
+++ b/contrib/meson/meson/meson.build
@ -0,0 +1,67 @@
 # #############################################################################
 # Copyright (c) 2018-present        lzutao <taolzu(at)gmail.com>
 # Copyright (c) 2022-present        Tristan Partin <tristan(at)partin.io>
 # 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).
 # #############################################################################
 cc = meson.get_compiler('c')
 pkgconfig = import('pkgconfig')
 lz4_source_root = '../../..'
 lz4_version = meson.project_version()
 lz4_h_file = lz4_source_root / 'lib/lz4.h'
 GetLz4LibraryVersion_py = find_program('GetLz4LibraryVersion.py')
 lz4_version = run_command(GetLz4LibraryVersion_py, lz4_h_file, check: true).stdout().strip()
 message('Project version is now: @0@'.format(lz4_version))
 add_project_arguments('-DXXH_NAMESPACE=LZ4_', language: 'c')
 if get_option('debug')
  add_project_arguments(cc.get_supported_arguments([
        '-Wcast-qual',
        '-Wcast-align',
        '-Wshadow',
        '-Wswitch-enum',
        '-Wdeclaration-after-statement',
        '-Wstrict-prototypes',
        '-Wundef',
        '-Wpointer-arith',
        '-Wstrict-aliasing=1',
        '-DLZ4_DEBUG=@0@'.format(get_option('debug-level')),
      ]
    ),
    language: 'c',
  )
 endif
 if get_option('memory-usage') > 0
  add_project_arguments(
    '-DLZ4_MEMORY_USAGE=@0@'.format(get_option('memory-usage')),
    language: 'c'
  )
 endif
 subdir('lib')
 if get_option('programs')
  subdir('programs')
 endif
 if get_option('tests')
  subdir('tests')
 endif
 if get_option('contrib')
  subdir('contrib')
 endif
 if get_option('examples')
  subdir('examples')
 endif
--- a/contrib/meson/meson/programs/meson.build
+++ b/contrib/meson/meson/programs/meson.build
@ -0,0 +1,44 @@
 # #############################################################################
 # Copyright (c) 2018-present        lzutao <taolzu(at)gmail.com>
 # Copyright (c) 2022-present        Tristan Partin <tristan(at)partin.io>
 # 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).
 # #############################################################################
 lz4_source_root = '../../../..'
 sources = files(
  lz4_source_root / 'programs/bench.c',
  lz4_source_root / 'programs/datagen.c',
  lz4_source_root / 'programs/lz4cli.c',
  lz4_source_root / 'programs/lz4io.c',
 )
 lz4 = executable(
  'lz4',
  sources,
  include_directories: include_directories(lz4_source_root / 'programs'),
  dependencies: [liblz4_internal_dep],
  export_dynamic: get_option('debug') and host_machine.system() == 'windows',
  install: true
 )
 install_man(lz4_source_root / 'programs/lz4.1')
 if meson.version().version_compare('>=0.61.0')
  foreach alias : ['lz4c', 'lz4cat', 'unlz4']
    install_symlink(
      alias,
      install_dir: get_option('bindir'),
      pointing_to: 'lz4'
    )
    install_symlink(
      '@0@.1'.format(alias),
      install_dir: get_option('mandir') / 'man1',
      pointing_to: 'lz4.1'
    )
  endforeach
 endif
--- a/contrib/meson/meson/tests/meson.build
+++ b/contrib/meson/meson/tests/meson.build
@ -0,0 +1,52 @@
 # #############################################################################
 # Copyright (c) 2018-present        lzutao <taolzu(at)gmail.com>
 # Copyright (c) 2022-present        Tristan Partin <tristan(at)partin.io>
 # 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).
 # #############################################################################
 lz4_source_root = '../../../..'
 exes = {
  'fullbench': {
    'sources': files(lz4_source_root / 'tests/fullbench.c'),
    'include_directories': include_directories(lz4_source_root / 'programs'),
  },
  'fuzzer': {
    'sources': files(lz4_source_root / 'tests/fuzzer.c'),
    'include_directories': include_directories(lz4_source_root / 'programs'),
  },
  'frametest': {
    'sources': files(lz4_source_root / 'tests/frametest.c'),
    'include_directories': include_directories(lz4_source_root / 'programs'),
  },
  'roundTripTest': {
    'sources': files(lz4_source_root / 'tests/roundTripTest.c'),
  },
  'datagen': {
    'sources': files(lz4_source_root / 'tests/datagencli.c'),
    'objects': lz4.extract_objects(lz4_source_root / 'programs/datagen.c'),
    'include_directories': include_directories(lz4_source_root / 'programs'),
  },
  'checkFrame': {
    'sources': files(lz4_source_root / 'tests/checkFrame.c'),
    'include_directories': include_directories(lz4_source_root / 'programs'),
  },
  'checkTag': {
    'sources': files(lz4_source_root / 'tests/checkTag.c'),
  },
 }
 foreach e, attrs : exes
  executable(
    e,
    attrs.get('sources'),
    objects: attrs.get('objects', []),
    dependencies: [liblz4_internal_dep],
    include_directories: attrs.get('include_directories', []),
    install: false
  )
 endforeach
--- a/contrib/meson/meson_options.txt
+++ b/contrib/meson/meson_options.txt
@ -0,0 +1,24 @@
 # #############################################################################
 # Copyright (c) 2018-present        lzutao <taolzu(at)gmail.com>
 # Copyright (c) 2022-present        Tristan Partin <tristan(at)partin.io>
 # 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).
 # #############################################################################
 option('debug-level', type: 'integer', min: 0, max: 7, value: 1,
  description: 'Enable run-time debug. See lib/lz4hc.c')
 option('unstable', type: 'boolean', value: false,
  description: 'Expose unstable interfaces')
 option('programs', type: 'boolean', value: false,
  description: 'Enable programs build')
 option('tests', type: 'boolean', value: false,
  description: 'Enable tests build')
 option('contrib', type: 'boolean', value: false,
  description: 'Enable contrib build')
 option('examples', type: 'boolean', value: false,
  description: 'Enable examples build')
 option('memory-usage', type: 'integer', min: 0, value: 0,
  description: 'See LZ4_MEMORY_USAGE. 0 means use the LZ4 default')
--- a/contrib/snap/README.md
+++ b/contrib/snap/README.md
@ -0,0 +1,29 @@
 Snap Packaging
 --------------
 This directory contains the config required to generate a snap package
 of lz4. Snaps are universal Linux packages that allow you to easily
 build your application from any source and ship it to any Linux
 distribution by publishing it to https://snapcraft.io/. A key attribute
 of a snap package is that it is (ideally) confined such that it
 executes within a controlled environment with all its dependencies
 bundled with it and does not share dependencies with of from any other
 package on the system (with a couple of minor exceptions).
 The basic anatomy and workflow is:
  * ensure snap.snapcraft.yaml is up-to-date e.g. with version info
  * build the snap by installing the snapcraft package and running it
  * push snap/* changes to the repo (excluding any crud generated by a build of course)
  * register yourself as owner of lz4 name in snapstore
  * publish new snap to the snap store
  * install snap by doing 'snap install lz4' on any Linux distro
  * all installed copies of lz4 will be automatically updated to your new version
 For more information on Snaps see https://docs.snapcraft.io and https://forum.snapcraft.io/
--- a/contrib/snap/snapcraft.yaml
+++ b/contrib/snap/snapcraft.yaml
@ -0,0 +1,31 @@
 name: lz4
 version: 1.9.3 
 summary: Extremely Fast Compression algorithm 
 description: >
    LZ4 is lossless compression algorithm, providing compression
    speed > 500 MB/s per core, scalable with multi-cores CPU. It features an
    extremely fast decoder, with speed in multiple GB/s per core, typically
    reaching RAM speed limits on multi-core systems.
    .
    Speed can be tuned dynamically, selecting an "acceleration" factor which
    trades compression ratio for faster speed. On the other end, a high
    compression derivative, LZ4_HC, is also provided, trading CPU time for
    improved compression ratio. All versions feature the same decompression
    speed.
    .
    LZ4 is also compatible with dictionary compression, and can ingest any
    input file as dictionary, including those created by Zstandard Dictionary
    Builder. (note: only the final 64KB are used).
    .
    LZ4 library is provided as open-source software using BSD 2-Clause license.
 confinement: strict
 grade: stable
 apps:
  lz4:
    command: usr/local/bin/lz4
    plugs: [home]
 parts:
  lz4:
    source: ../
    plugin: make
--- a/doc/lz4_Block_format.md
+++ b/doc/lz4_Block_format.md
@ -0,0 +1,244 @@
 LZ4 Block Format Description
 ============================
 Last revised: 2022-07-31 .
 Author : Yann Collet
 This specification is intended for developers willing to
 produce or read LZ4 compressed data blocks
 using any programming language of their choice.
 LZ4 is an LZ77-type compressor with a fixed byte-oriented encoding format.
 There is no entropy encoder back-end nor framing layer.
 The latter is assumed to be handled by other parts of the system
 (see [LZ4 Frame format]).
 This design is assumed to favor simplicity and speed.
 This document describes only the Block Format,
 not how the compressor nor decompressor actually work.
 For more details on such topics, see later section "Implementation Notes".
 [LZ4 Frame format]: lz4_Frame_format.md
 Compressed block format
 -----------------------
 An LZ4 compressed block is composed of sequences.
 A sequence is a suite of literals (not-compressed bytes),
 followed by a match copy operation.
 Each sequence starts with a `token`.
 The `token` is a one byte value, separated into two 4-bits fields.
 Therefore each field ranges from 0 to 15.
 The first field uses the 4 high-bits of the token.
 It provides the length of literals to follow.
 If the field value is smaller than 15,
 then it represents the total nb of literals present in the sequence,
 including 0, in which case there is no literal.
 The value 15 is a special case: more bytes are required to indicate the full length.
 Each additional byte then represents a value from 0 to 255,
 which is added to the previous value to produce a total length.
 When the byte value is 255, another byte must be read and added, and so on.
 There can be any number of bytes of value `255` following `token`.
 The Block Format does not define any "size limit",
 though real implementations may feature some practical limits
 (see more details in later chapter "Implementation Notes").
 Note : this format explains why a non-compressible input block is expanded by 0.4%.
 Example 1 : A literal length of 48 will be represented as :
  - 15 : value for the 4-bits High field
  - 33 : (=48-15) remaining length to reach 48
 Example 2 : A literal length of 280 will be represented as :
  - 15  : value for the 4-bits High field
  - 255 : following byte is maxed, since 280-15 >= 255
  - 10  : (=280 - 15 - 255) remaining length to reach 280
 Example 3 : A literal length of 15 will be represented as :
  - 15 : value for the 4-bits High field
  - 0  : (=15-15) yes, the zero must be output
 Following `token` and optional length bytes, are the literals themselves.
 They are exactly as numerous as just decoded (length of literals).
 Reminder: it's possible that there are zero literals.
 Following the literals is the match copy operation.
 It starts by the `offset` value.
 This is a 2 bytes value, in little endian format
 (the 1st byte is the "low" byte, the 2nd one is the "high" byte).
 The `offset` represents the position of the match to be copied from the past.
 For example, 1 means "current position - 1 byte".
 The maximum `offset` value is 65535. 65536 and beyond cannot be coded.
 Note that 0 is an invalid `offset` value.
 The presence of a 0 `offset` value denotes an invalid (corrupted) block.
 Then the `matchlength` can be extracted.
 For this, we use the second `token` field, the low 4-bits.
 Such a value, obviously, ranges from 0 to 15.
 However here, 0 means that the copy operation is minimal.
 The minimum length of a match, called `minmatch`, is 4.
 As a consequence, a 0 value means 4 bytes.
 Similarly to literal length, any value smaller than 15 represents a length,
 to which 4 (`minmatch`) must be added, thus ranging from 4 to 18.
 A value of 15 is special, meaning 19+ bytes,
 to which one must read additional bytes, one at a time,
 with each byte value ranging from 0 to 255.
 They are added to total to provide the final match length.
 A 255 value means there is another byte to read and add.
 There is no limit to the number of optional `255` bytes that can be present,
 and therefore no limit to representable match length,
 though real-life implementations are likely going to enforce limits for practical reasons (see more details in "Implementation Notes" section below).
 Note: this format has a maximum achievable compression ratio of about ~250.
 Decoding the `matchlength` reaches the end of current sequence.
 Next byte will be the start of another sequence, and therefore a new `token`.
 End of block conditions
 -------------------------
 There are specific restrictions required to terminate an LZ4 block.
 1. The last sequence contains only literals.
   The block ends right after the literals (no `offset` field).
 2. The last 5 bytes of input are always literals.
   Therefore, the last sequence contains at least 5 bytes.
   - Special : if input is smaller than 5 bytes,
     there is only one sequence, it contains the whole input as literals.
     Even empty input can be represented, using a zero byte,
     interpreted as a final token without literal and without a match.
 3. The last match must start at least 12 bytes before the end of block.
   The last match is part of the _penultimate_ sequence.
   It is followed by the last sequence, which contains _only_ literals.
   - Note that, as a consequence,
     blocks < 12 bytes cannot be compressed.
     And as an extension, _independent_ blocks < 13 bytes cannot be compressed,
     because they must start by at least one literal,
     that the match can then copy afterwards.
 When a block does not respect these end conditions,
 a conformant decoder is allowed to reject the block as incorrect.
 These rules are in place to ensure compatibility with
 a wide range of historical decoders
 which rely on these conditions for their speed-oriented design.
 Implementation notes
 -----------------------
 The LZ4 Block Format only defines the compressed format,
 it does not tell how to create a decoder or an encoder,
 which design is left free to the imagination of the implementer.
 However, thanks to experience, there are a number of typical topics that
 most implementations will have to consider.
 This section tries to provide a few guidelines.
 #### Metadata
 An LZ4-compressed Block requires additional metadata for proper decoding.
 Typically, a decoder will require the compressed block's size,
 and an upper bound of decompressed size.
 Other variants exist, such as knowing the decompressed size,
 and having an upper bound of the input size.
 The Block Format does not specify how to transmit such information,
 which is considered an out-of-band information channel.
 That's because in many cases, the information is present in the environment.
 For example, databases must store the size of their compressed block for indexing,
 and know that their decompressed block can't be larger than a certain threshold.
 If you need a format which is "self-contained",
 and also transports the necessary metadata for proper decoding on any platform,
 consider employing the [LZ4 Frame format] instead.
 #### Large lengths
 While the Block Format does not define any maximum value for length fields,
 in practice, most implementations will feature some form of limit,
 since it's expected for such values to be stored into registers of fixed bit width.
 If length fields use 64-bit registers,
 then it can be assumed that there is no practical limit,
 as it would require a single continuous block of multiple petabytes to reach it,
 which is unreasonable by today's standard.
 If length fields use 32-bit registers, then it can be overflowed,
 but requires a compressed block of size > 16 MB.
 Therefore, implementations that do not deal with compressed blocks > 16 MB are safe.
 However, if such a case is allowed,
 then it's recommended to check that no large length overflows the register.
 If length fields use 16-bit registers,
 then it's definitely possible to overflow such register,
 with less than < 300 bytes of compressed data.
 A conformant decoder should be able to detect length overflows when it's possible,
 and simply error out when that happens.
 The input block might not be invalid,
 it's just not decodable by the local decoder implementation.
 Note that, in order to be compatible with the larger LZ4 ecosystem,
 it's recommended to be able to read and represent lengths of up to 4 MB,
 and to accept blocks of size up to 4 MB.
 Such limits are compatible with 32-bit length registers,
 and prevent overflow of 32-bit registers.
 #### Safe decoding
 If a decoder receives compressed data from any external source,
 it is recommended to ensure that the decoder is resilient to corrupted input,
 and made safe from buffer overflow manipulations.
 Always ensure that read and write operations
 remain within the limits of provided buffers.
 Of particular importance, ensure that the nb of bytes instructed to copy
 does not overflow neither the input nor the output buffers.
 Ensure also, when reading an offset value, that the resulting position to copy
 does not reach beyond the beginning of the buffer.
 Such a situation can happen during the first 64 KB of decoded data.
 For more safety, test the decoder with fuzzers
 to ensure it's resilient to improbable sequences of conditions.
 Combine them with sanitizers, in order to catch overflows (asan)
 or initialization issues (msan).
 Pay some attention to offset 0 scenario, which is invalid,
 and therefore must not be blindly decoded:
 a naive implementation could preserve destination buffer content,
 which could then result in information disclosure
 if such buffer was uninitialized and still containing private data.
 For reference, in such a scenario, the reference LZ4 decoder
 clears the match segment with `0` bytes,
 though other solutions are certainly possible.
 Finally, pay attention to the "overlap match" scenario,
 when `matchlength` is larger than `offset`.
 In which case, since `match_pos + matchlength > current_pos`,
 some of the later bytes to copy do not exist yet,
 and will be generated during the early stage of match copy operation.
 Such scenario must be handled with special care.
 A common case is an offset of 1,
 meaning the last byte is repeated `matchlength` times.
 #### Compression techniques
 The core of a LZ4 compressor is to detect duplicated data across past 64 KB.
 The format makes no assumption nor limits to the way a compressor
 searches and selects matches within the source data block.
 For example, an upper compression limit can be reached,
 using a technique called "full optimal parsing", at high cpu and memory cost.
 But multiple other techniques can be considered,
 featuring distinct time / performance trade-offs.
 As long as the specified format is respected,
 the result will be compatible with and decodable by any compliant decoder.
--- a/doc/lz4_Frame_format.md
+++ b/doc/lz4_Frame_format.md
@ -0,0 +1,432 @@
 LZ4 Frame Format Description
 ============================
 ### Notices
 Copyright (c) 2013-2020 Yann Collet
 Permission is granted to copy and distribute this document
 for any purpose and without charge,
 including translations into other languages
 and incorporation into compilations,
 provided that the copyright notice and this notice are preserved,
 and that any substantive changes or deletions from the original
 are clearly marked.
 Distribution of this document is unlimited.
 ### Version
 1.6.2 (12/08/2020)
 Introduction
 ------------
 The purpose of this document is to define a lossless compressed data format,
 that is independent of CPU type, operating system,
 file system and character set, suitable for
 File compression, Pipe and streaming compression
 using the [LZ4 algorithm](http://www.lz4.org).
 The data can be produced or consumed,
 even for an arbitrarily long sequentially presented input data stream,
 using only an a priori bounded amount of intermediate storage,
 and hence can be used in data communications.
 The format uses the LZ4 compression method,
 and optional [xxHash-32 checksum method](https://github.com/Cyan4973/xxHash),
 for detection of data corruption.
 The data format defined by this specification
 does not attempt to allow random access to compressed data.
 This specification is intended for use by implementers of software
 to compress data into LZ4 format and/or decompress data from LZ4 format.
 The text of the specification assumes a basic background in programming
 at the level of bits and other primitive data representations.
 Unless otherwise indicated below,
 a compliant compressor must produce data sets
 that conform to the specifications presented here.
 It doesn't need to support all options though.
 A compliant decompressor must be able to decompress
 at least one working set of parameters
 that conforms to the specifications presented here.
 It may also ignore checksums.
 Whenever it does not support a specific parameter within the compressed stream,
 it must produce a non-ambiguous error code
 and associated error message explaining which parameter is unsupported.
 General Structure of LZ4 Frame format
 -------------------------------------
 | MagicNb | F. Descriptor | Block | (...) | EndMark | C. Checksum |
 |:-------:|:-------------:| ----- | ----- | ------- | ----------- |
 | 4 bytes |  3-15 bytes   |       |       | 4 bytes | 0-4 bytes   |
 __Magic Number__
 4 Bytes, Little endian format.
 Value : 0x184D2204
 __Frame Descriptor__
 3 to 15 Bytes, to be detailed in its own paragraph,
 as it is the most important part of the spec.
 The combined _Magic_Number_ and _Frame_Descriptor_ fields are sometimes
 called ___LZ4 Frame Header___. Its size varies between 7 and 19 bytes.
 __Data Blocks__
 To be detailed in its own paragraph.
 That’s where compressed data is stored.
 __EndMark__
 The flow of blocks ends when the last data block is followed by
 the 32-bit value `0x00000000`.
 __Content Checksum__
 _Content_Checksum_ verify that the full content has been decoded correctly.
 The content checksum is the result of [xxHash-32 algorithm]
 digesting the original (decoded) data as input, and a seed of zero.
 Content checksum is only present when its associated flag
 is set in the frame descriptor.
 Content Checksum validates the result,
 that all blocks were fully transmitted in the correct order and without error,
 and also that the encoding/decoding process itself generated no distortion.
 Its usage is recommended.
 The combined _EndMark_ and _Content_Checksum_ fields might sometimes be
 referred to as ___LZ4 Frame Footer___. Its size varies between 4 and 8 bytes.
 __Frame Concatenation__
 In some circumstances, it may be preferable to append multiple frames,
 for example in order to add new data to an existing compressed file
 without re-framing it.
 In such case, each frame has its own set of descriptor flags.
 Each frame is considered independent.
 The only relation between frames is their sequential order.
 The ability to decode multiple concatenated frames
 within a single stream or file
 is left outside of this specification.
 As an example, the reference lz4 command line utility behavior is
 to decode all concatenated frames in their sequential order.
 Frame Descriptor
 ----------------
 | FLG     | BD      | (Content Size) | (Dictionary ID) | HC      |
 | ------- | ------- |:--------------:|:---------------:| ------- |
 | 1 byte  | 1 byte  |  0 - 8 bytes   |   0 - 4 bytes   | 1 byte  |
 The descriptor uses a minimum of 3 bytes,
 and up to 15 bytes depending on optional parameters.
 __FLG byte__
 |  BitNb  |  7-6  |   5   |    4     |  3   |    2     |    1     |   0  |
 | ------- |-------|-------|----------|------|----------|----------|------|
 |FieldName|Version|B.Indep|B.Checksum|C.Size|C.Checksum|*Reserved*|DictID|
 __BD byte__
 |  BitNb  |     7    |     6-5-4     |  3-2-1-0 |
 | ------- | -------- | ------------- | -------- |
 |FieldName|*Reserved*| Block MaxSize |*Reserved*|
 In the tables, bit 7 is highest bit, while bit 0 is lowest.
 __Version Number__
 2-bits field, must be set to `01`.
 Any other value cannot be decoded by this version of the specification.
 Other version numbers will use different flag layouts.
 __Block Independence flag__
 If this flag is set to “1”, blocks are independent.
 If this flag is set to “0”, each block depends on previous ones
 (up to LZ4 window size, which is 64 KB).
 In such case, it’s necessary to decode all blocks in sequence.
 Block dependency improves compression ratio, especially for small blocks.
 On the other hand, it makes random access or multi-threaded decoding impossible.
 __Block checksum flag__
 If this flag is set, each data block will be followed by a 4-bytes checksum,
 calculated by using the xxHash-32 algorithm on the raw (compressed) data block.
 The intention is to detect data corruption (storage or transmission errors)
 immediately, before decoding.
 Block checksum usage is optional.
 __Content Size flag__
 If this flag is set, the uncompressed size of data included within the frame
 will be present as an 8 bytes unsigned little endian value, after the flags.
 Content Size usage is optional.
 __Content checksum flag__
 If this flag is set, a 32-bits content checksum will be appended
 after the EndMark.
 __Dictionary ID flag__
 If this flag is set, a 4-bytes Dict-ID field will be present,
 after the descriptor flags and the Content Size.
 __Block Maximum Size__
 This information is useful to help the decoder allocate memory.
 Size here refers to the original (uncompressed) data size.
 Block Maximum Size is one value among the following table :
 |  0  |  1  |  2  |  3  |   4   |   5    |  6   |  7   |
 | --- | --- | --- | --- | ----- | ------ | ---- | ---- |
 | N/A | N/A | N/A | N/A | 64 KB | 256 KB | 1 MB | 4 MB |
 The decoder may refuse to allocate block sizes above any system-specific size.
 Unused values may be used in a future revision of the spec.
 A decoder conformant with the current version of the spec
 is only able to decode block sizes defined in this spec.
 __Reserved bits__
 Value of reserved bits **must** be 0 (zero).
 Reserved bit might be used in a future version of the specification,
 typically enabling new optional features.
 When this happens, a decoder respecting the current specification version
 shall not be able to decode such a frame.
 __Content Size__
 This is the original (uncompressed) size.
 This information is optional, and only present if the associated flag is set.
 Content size is provided using unsigned 8 Bytes, for a maximum of 16 Exabytes.
 Format is Little endian.
 This value is informational, typically for display or memory allocation.
 It can be skipped by a decoder, or used to validate content correctness.
 __Dictionary ID__
 Dict-ID is only present if the associated flag is set.
 It's an unsigned 32-bits value, stored using little-endian convention.
 A dictionary is useful to compress short input sequences.
 The compressor can take advantage of the dictionary context
 to encode the input in a more compact manner.
 It works as a kind of “known prefix” which is used by
 both the compressor and the decompressor to “warm-up” reference tables.
 The decompressor can use Dict-ID identifier to determine
 which dictionary must be used to correctly decode data.
 The compressor and the decompressor must use exactly the same dictionary.
 It's presumed that the 32-bits dictID uniquely identifies a dictionary.
 Within a single frame, a single dictionary can be defined.
 When the frame descriptor defines independent blocks,
 each block will be initialized with the same dictionary.
 If the frame descriptor defines linked blocks,
 the dictionary will only be used once, at the beginning of the frame.
 __Header Checksum__
 One-byte checksum of combined descriptor fields, including optional ones.
 The value is the second byte of `xxh32()` : ` (xxh32()>>8) & 0xFF `
 using zero as a seed, and the full Frame Descriptor as an input
 (including optional fields when they are present).
 A wrong checksum indicates that the descriptor is erroneous.
 Data Blocks
 -----------
 | Block Size |  data  | (Block Checksum) |
 |:----------:| ------ |:----------------:|
 |  4 bytes   |        |   0 - 4 bytes    |
 __Block Size__
 This field uses 4-bytes, format is little-endian.
 If the highest bit is set (`1`), the block is uncompressed.
 If the highest bit is not set (`0`), the block is LZ4-compressed,
 using the [LZ4 block format specification](https://github.com/lz4/lz4/blob/dev/doc/lz4_Block_format.md).
 All other bits give the size, in bytes, of the data section.
 The size does not include the block checksum if present.
 _Block_Size_ shall never be larger than _Block_Maximum_Size_.
 Such an outcome could potentially happen for non-compressible sources.
 In such a case, such data block must be passed using uncompressed format.
 A value of `0x00000000` is invalid, and signifies an _EndMark_ instead.
 Note that this is different from a value of `0x80000000` (highest bit set),
 which is an uncompressed block of size 0 (empty),
 which is valid, and therefore doesn't end a frame.
 Note that, if _Block_checksum_ is enabled,
 even an empty block must be followed by a 32-bit block checksum.
 __Data__
 Where the actual data to decode stands.
 It might be compressed or not, depending on previous field indications.
 When compressed, the data must respect the [LZ4 block format specification](https://github.com/lz4/lz4/blob/dev/doc/lz4_Block_format.md).
 Note that a block is not necessarily full.
 Uncompressed size of data can be any size __up to__ _Block_Maximum_Size_,
 so it may contain less data than the maximum block size.
 __Block checksum__
 Only present if the associated flag is set.
 This is a 4-bytes checksum value, in little endian format,
 calculated by using the [xxHash-32 algorithm] on the __raw__ (undecoded) data block,
 and a seed of zero.
 The intention is to detect data corruption (storage or transmission errors)
 before decoding.
 _Block_checksum_ can be cumulative with _Content_checksum_.
 [xxHash-32 algorithm]: https://github.com/Cyan4973/xxHash/blob/release/doc/xxhash_spec.md
 Skippable Frames
 ----------------
 | Magic Number | Frame Size | User Data |
 |:------------:|:----------:| --------- |
 |   4 bytes    |  4 bytes   |           |
 Skippable frames allow the integration of user-defined data
 into a flow of concatenated frames.
 Its design is pretty straightforward,
 with the sole objective to allow the decoder to quickly skip
 over user-defined data and continue decoding.
 For the purpose of facilitating identification,
 it is discouraged to start a flow of concatenated frames with a skippable frame.
 If there is a need to start such a flow with some user data
 encapsulated into a skippable frame,
 it’s recommended to start with a zero-byte LZ4 frame
 followed by a skippable frame.
 This will make it easier for file type identifiers.
 __Magic Number__
 4 Bytes, Little endian format.
 Value : 0x184D2A5X, which means any value from 0x184D2A50 to 0x184D2A5F.
 All 16 values are valid to identify a skippable frame.
 __Frame Size__
 This is the size, in bytes, of the following User Data
 (without including the magic number nor the size field itself).
 4 Bytes, Little endian format, unsigned 32-bits.
 This means User Data can’t be bigger than (2^32-1) Bytes.
 __User Data__
 User Data can be anything. Data will just be skipped by the decoder.
 Legacy frame
 ------------
 The Legacy frame format was defined into the initial versions of “LZ4Demo”.
 Newer compressors should not use this format anymore, as it is too restrictive.
 Main characteristics of the legacy format :
 - Fixed block size : 8 MB.
 - All blocks must be completely filled, except the last one.
 - All blocks are always compressed, even when compression is detrimental.
 - The last block is detected either because
  it is followed by the “EOF” (End of File) mark,
  or because it is followed by a known Frame Magic Number.
 - No checksum
 - Convention is Little endian
 | MagicNb | B.CSize | CData | B.CSize | CData |  (...)  | EndMark |
 | ------- | ------- | ----- | ------- | ----- | ------- | ------- |
 | 4 bytes | 4 bytes | CSize | 4 bytes | CSize | x times |   EOF   |
 __Magic Number__
 4 Bytes, Little endian format.
 Value : 0x184C2102
 __Block Compressed Size__
 This is the size, in bytes, of the following compressed data block.
 4 Bytes, Little endian format.
 __Data__
 Where the actual compressed data stands.
 Data is always compressed, even when compression is detrimental.
 __EndMark__
 End of legacy frame is implicit only.
 It must be followed by a standard EOF (End Of File) signal,
 whether it is a file or a stream.
 Alternatively, if the frame is followed by a valid Frame Magic Number,
 it is considered completed.
 This policy makes it possible to concatenate legacy frames.
 Any other value will be interpreted as a block size,
 and trigger an error if it does not fit within acceptable range.
 Version changes
 ---------------
 1.6.2 : clarifies specification of _EndMark_
 1.6.1 : introduced terms "LZ4 Frame Header" and "LZ4 Frame Footer"
 1.6.0 : restored Dictionary ID field in Frame header
 1.5.1 : changed document format to MarkDown
 1.5 : removed Dictionary ID from specification
 1.4.1 : changed wording from “stream” to “frame”
 1.4 : added skippable streams, re-added stream checksum
 1.3 : modified header checksum
 1.2 : reduced choice of “block size”, to postpone decision on “dynamic size of BlockSize Field”.
 1.1 : optional fields are now part of the descriptor
 1.0 : changed “block size” specification, adding a compressed/uncompressed flag
 0.9 : reduced scale of “block maximum size” table
 0.8 : removed : high compression flag
 0.7 : removed : stream checksum
 0.6 : settled : stream size uses 8 bytes, endian convention is little endian
 0.5: added copyright notice
 0.4 : changed format to Google Doc compatible OpenDocument
--- a/doc/lz4_manual.html
+++ b/doc/lz4_manual.html
@ -0,0 +1,613 @@
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <title>1.9.4 Manual</title>
 </head>
 <body>
 <h1>1.9.4 Manual</h1>
 <hr>
 <a name="Contents"></a><h2>Contents</h2>
 <ol>
 <li><a href="#Chapter1">Introduction</a></li>
 <li><a href="#Chapter2">Version</a></li>
 <li><a href="#Chapter3">Tuning parameter</a></li>
 <li><a href="#Chapter4">Simple Functions</a></li>
 <li><a href="#Chapter5">Advanced Functions</a></li>
 <li><a href="#Chapter6">Streaming Compression Functions</a></li>
 <li><a href="#Chapter7">Streaming Decompression Functions</a></li>
 <li><a href="#Chapter8">Experimental section</a></li>
 <li><a href="#Chapter9">Private Definitions</a></li>
 <li><a href="#Chapter10">Obsolete Functions</a></li>
 </ol>
 <hr>
 <a name="Chapter1"></a><h2>Introduction</h2><pre>
  LZ4 is lossless compression algorithm, providing compression speed >500 MB/s per core,
  scalable with multi-cores CPU. It features an extremely fast decoder, with speed in
  multiple GB/s per core, typically reaching RAM speed limits on multi-core systems.
  The LZ4 compression library provides in-memory compression and decompression functions.
  It gives full buffer control to user.
  Compression can be done in:
    - a single step (described as Simple Functions)
    - a single step, reusing a context (described in Advanced Functions)
    - unbounded multiple steps (described as Streaming compression)
  lz4.h generates and decodes LZ4-compressed blocks (doc/lz4_Block_format.md).
  Decompressing such a compressed block requires additional metadata.
  Exact metadata depends on exact decompression function.
  For the typical case of LZ4_decompress_safe(),
  metadata includes block's compressed size, and maximum bound of decompressed size.
  Each application is free to encode and pass such metadata in whichever way it wants.
  lz4.h only handle blocks, it can not generate Frames.
  Blocks are different from Frames (doc/lz4_Frame_format.md).
  Frames bundle both blocks and metadata in a specified manner.
  Embedding metadata is required for compressed data to be self-contained and portable.
  Frame format is delivered through a companion API, declared in lz4frame.h.
  The `lz4` CLI can only manage frames.
 <BR></pre>
 <pre><b>#if defined(LZ4_FREESTANDING) && (LZ4_FREESTANDING == 1)
 #  define LZ4_HEAPMODE 0
 #  define LZ4HC_HEAPMODE 0
 #  define LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION 1
 #  if !defined(LZ4_memcpy)
 #    error "LZ4_FREESTANDING requires macro 'LZ4_memcpy'."
 #  endif
 #  if !defined(LZ4_memset)
 #    error "LZ4_FREESTANDING requires macro 'LZ4_memset'."
 #  endif
 #  if !defined(LZ4_memmove)
 #    error "LZ4_FREESTANDING requires macro 'LZ4_memmove'."
 #  endif
 #elif ! defined(LZ4_FREESTANDING)
 #  define LZ4_FREESTANDING 0
 #endif
 </b><p>  When this macro is set to 1, it enables "freestanding mode" that is
  suitable for typical freestanding environment which doesn't support
  standard C library.
  - LZ4_FREESTANDING is a compile-time switch.
  - It requires the following macros to be defined:
    LZ4_memcpy, LZ4_memmove, LZ4_memset.
  - It only enables LZ4/HC functions which don't use heap.
    All LZ4F_* functions are not supported.
  - See tests/freestanding.c to check its basic setup.
 </p></pre><BR>
 <a name="Chapter2"></a><h2>Version</h2><pre></pre>
 <pre><b>int LZ4_versionNumber (void);  </b>/**< library version number; useful to check dll version; requires v1.3.0+ */<b>
 </b></pre><BR>
 <pre><b>const char* LZ4_versionString (void);   </b>/**< library version string; useful to check dll version; requires v1.7.5+ */<b>
 </b></pre><BR>
 <a name="Chapter3"></a><h2>Tuning parameter</h2><pre></pre>
 <pre><b>#ifndef LZ4_MEMORY_USAGE
 # define LZ4_MEMORY_USAGE LZ4_MEMORY_USAGE_DEFAULT
 #endif
 </b><p> Memory usage formula : N->2^N Bytes (examples : 10 -> 1KB; 12 -> 4KB ; 16 -> 64KB; 20 -> 1MB; )
 Increasing memory usage improves compression ratio, at the cost of speed.
 Reduced memory usage may improve speed at the cost of ratio, thanks to better cache locality.
 Default value is 14, for 16KB, which nicely fits into Intel x86 L1 cache
 </p></pre><BR>
 <a name="Chapter4"></a><h2>Simple Functions</h2><pre></pre>
 <pre><b>int LZ4_compress_default(const char* src, char* dst, int srcSize, int dstCapacity);
 </b><p>  Compresses 'srcSize' bytes from buffer 'src'
  into already allocated 'dst' buffer of size 'dstCapacity'.
  Compression is guaranteed to succeed if 'dstCapacity' >= LZ4_compressBound(srcSize).
  It also runs faster, so it's a recommended setting.
  If the function cannot compress 'src' into a more limited 'dst' budget,
  compression stops *immediately*, and the function result is zero.
  In which case, 'dst' content is undefined (invalid).
      srcSize : max supported value is LZ4_MAX_INPUT_SIZE.
      dstCapacity : size of buffer 'dst' (which must be already allocated)
     @return  : the number of bytes written into buffer 'dst' (necessarily <= dstCapacity)
                or 0 if compression fails
 Note : This function is protected against buffer overflow scenarios (never writes outside 'dst' buffer, nor read outside 'source' buffer).
 </p></pre><BR>
 <pre><b>int LZ4_decompress_safe (const char* src, char* dst, int compressedSize, int dstCapacity);
 </b><p>  compressedSize : is the exact complete size of the compressed block.
  dstCapacity : is the size of destination buffer (which must be already allocated), presumed an upper bound of decompressed size.
 @return : the number of bytes decompressed into destination buffer (necessarily <= dstCapacity)
           If destination buffer is not large enough, decoding will stop and output an error code (negative value).
           If the source stream is detected malformed, the function will stop decoding and return a negative result.
 Note 1 : This function is protected against malicious data packets :
          it will never writes outside 'dst' buffer, nor read outside 'source' buffer,
          even if the compressed block is maliciously modified to order the decoder to do these actions.
          In such case, the decoder stops immediately, and considers the compressed block malformed.
 Note 2 : compressedSize and dstCapacity must be provided to the function, the compressed block does not contain them.
          The implementation is free to send / store / derive this information in whichever way is most beneficial.
          If there is a need for a different format which bundles together both compressed data and its metadata, consider looking at lz4frame.h instead.
 </p></pre><BR>
 <a name="Chapter5"></a><h2>Advanced Functions</h2><pre></pre>
 <pre><b>int LZ4_compressBound(int inputSize);
 </b><p>    Provides the maximum size that LZ4 compression may output in a "worst case" scenario (input data not compressible)
    This function is primarily useful for memory allocation purposes (destination buffer size).
    Macro LZ4_COMPRESSBOUND() is also provided for compilation-time evaluation (stack memory allocation for example).
    Note that LZ4_compress_default() compresses faster when dstCapacity is >= LZ4_compressBound(srcSize)
        inputSize  : max supported value is LZ4_MAX_INPUT_SIZE
        return : maximum output size in a "worst case" scenario
              or 0, if input size is incorrect (too large or negative)
 </p></pre><BR>
 <pre><b>int LZ4_compress_fast (const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
 </b><p>    Same as LZ4_compress_default(), but allows selection of "acceleration" factor.
    The larger the acceleration value, the faster the algorithm, but also the lesser the compression.
    It's a trade-off. It can be fine tuned, with each successive value providing roughly +~3% to speed.
    An acceleration value of "1" is the same as regular LZ4_compress_default()
    Values <= 0 will be replaced by LZ4_ACCELERATION_DEFAULT (currently == 1, see lz4.c).
    Values > LZ4_ACCELERATION_MAX will be replaced by LZ4_ACCELERATION_MAX (currently == 65537, see lz4.c).
 </p></pre><BR>
 <pre><b>int LZ4_sizeofState(void);
 int LZ4_compress_fast_extState (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
 </b><p>  Same as LZ4_compress_fast(), using an externally allocated memory space for its state.
  Use LZ4_sizeofState() to know how much memory must be allocated,
  and allocate it on 8-bytes boundaries (using `malloc()` typically).
  Then, provide this buffer as `void* state` to compression function.
 </p></pre><BR>
 <pre><b>int LZ4_compress_destSize (const char* src, char* dst, int* srcSizePtr, int targetDstSize);
 </b><p>  Reverse the logic : compresses as much data as possible from 'src' buffer
  into already allocated buffer 'dst', of size >= 'targetDestSize'.
  This function either compresses the entire 'src' content into 'dst' if it's large enough,
  or fill 'dst' buffer completely with as much data as possible from 'src'.
  note: acceleration parameter is fixed to "default".
 *srcSizePtr : will be modified to indicate how many bytes where read from 'src' to fill 'dst'.
               New value is necessarily <= input value.
 @return : Nb bytes written into 'dst' (necessarily <= targetDestSize)
           or 0 if compression fails.
 Note : from v1.8.2 to v1.9.1, this function had a bug (fixed un v1.9.2+):
        the produced compressed content could, in specific circumstances,
        require to be decompressed into a destination buffer larger
        by at least 1 byte than the content to decompress.
        If an application uses `LZ4_compress_destSize()`,
        it's highly recommended to update liblz4 to v1.9.2 or better.
        If this can't be done or ensured,
        the receiving decompression function should provide
        a dstCapacity which is > decompressedSize, by at least 1 byte.
        See https://github.com/lz4/lz4/issues/859 for details
 </p></pre><BR>
 <pre><b>int LZ4_decompress_safe_partial (const char* src, char* dst, int srcSize, int targetOutputSize, int dstCapacity);
 </b><p>  Decompress an LZ4 compressed block, of size 'srcSize' at position 'src',
  into destination buffer 'dst' of size 'dstCapacity'.
  Up to 'targetOutputSize' bytes will be decoded.
  The function stops decoding on reaching this objective.
  This can be useful to boost performance
  whenever only the beginning of a block is required.
 @return : the number of bytes decoded in `dst` (necessarily <= targetOutputSize)
           If source stream is detected malformed, function returns a negative result.
  Note 1 : @return can be < targetOutputSize, if compressed block contains less data.
  Note 2 : targetOutputSize must be <= dstCapacity
  Note 3 : this function effectively stops decoding on reaching targetOutputSize,
           so dstCapacity is kind of redundant.
           This is because in older versions of this function,
           decoding operation would still write complete sequences.
           Therefore, there was no guarantee that it would stop writing at exactly targetOutputSize,
           it could write more bytes, though only up to dstCapacity.
           Some "margin" used to be required for this operation to work properly.
           Thankfully, this is no longer necessary.
           The function nonetheless keeps the same signature, in an effort to preserve API compatibility.
  Note 4 : If srcSize is the exact size of the block,
           then targetOutputSize can be any value,
           including larger than the block's decompressed size.
           The function will, at most, generate block's decompressed size.
  Note 5 : If srcSize is _larger_ than block's compressed size,
           then targetOutputSize **MUST** be <= block's decompressed size.
           Otherwise, *silent corruption will occur*.
 </p></pre><BR>
 <a name="Chapter6"></a><h2>Streaming Compression Functions</h2><pre></pre>
 <pre><b>void LZ4_resetStream_fast (LZ4_stream_t* streamPtr);
 </b><p>  Use this to prepare an LZ4_stream_t for a new chain of dependent blocks
  (e.g., LZ4_compress_fast_continue()).
  An LZ4_stream_t must be initialized once before usage.
  This is automatically done when created by LZ4_createStream().
  However, should the LZ4_stream_t be simply declared on stack (for example),
  it's necessary to initialize it first, using LZ4_initStream().
  After init, start any new stream with LZ4_resetStream_fast().
  A same LZ4_stream_t can be re-used multiple times consecutively
  and compress multiple streams,
  provided that it starts each new stream with LZ4_resetStream_fast().
  LZ4_resetStream_fast() is much faster than LZ4_initStream(),
  but is not compatible with memory regions containing garbage data.
  Note: it's only useful to call LZ4_resetStream_fast()
        in the context of streaming compression.
        The *extState* functions perform their own resets.
        Invoking LZ4_resetStream_fast() before is redundant, and even counterproductive.
 </p></pre><BR>
 <pre><b>int LZ4_loadDict (LZ4_stream_t* streamPtr, const char* dictionary, int dictSize);
 </b><p>  Use this function to reference a static dictionary into LZ4_stream_t.
  The dictionary must remain available during compression.
  LZ4_loadDict() triggers a reset, so any previous data will be forgotten.
  The same dictionary will have to be loaded on decompression side for successful decoding.
  Dictionary are useful for better compression of small data (KB range).
  While LZ4 accept any input as dictionary,
  results are generally better when using Zstandard's Dictionary Builder.
  Loading a size of 0 is allowed, and is the same as reset.
 @return : loaded dictionary size, in bytes (necessarily <= 64 KB)
 </p></pre><BR>
 <pre><b>int LZ4_compress_fast_continue (LZ4_stream_t* streamPtr, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
 </b><p>  Compress 'src' content using data from previously compressed blocks, for better compression ratio.
 'dst' buffer must be already allocated.
  If dstCapacity >= LZ4_compressBound(srcSize), compression is guaranteed to succeed, and runs faster.
 @return : size of compressed block
           or 0 if there is an error (typically, cannot fit into 'dst').
  Note 1 : Each invocation to LZ4_compress_fast_continue() generates a new block.
           Each block has precise boundaries.
           Each block must be decompressed separately, calling LZ4_decompress_*() with relevant metadata.
           It's not possible to append blocks together and expect a single invocation of LZ4_decompress_*() to decompress them together.
  Note 2 : The previous 64KB of source data is __assumed__ to remain present, unmodified, at same address in memory !
  Note 3 : When input is structured as a double-buffer, each buffer can have any size, including < 64 KB.
           Make sure that buffers are separated, by at least one byte.
           This construction ensures that each block only depends on previous block.
  Note 4 : If input buffer is a ring-buffer, it can have any size, including < 64 KB.
  Note 5 : After an error, the stream status is undefined (invalid), it can only be reset or freed.
 </p></pre><BR>
 <pre><b>int LZ4_saveDict (LZ4_stream_t* streamPtr, char* safeBuffer, int maxDictSize);
 </b><p>  If last 64KB data cannot be guaranteed to remain available at its current memory location,
  save it into a safer place (char* safeBuffer).
  This is schematically equivalent to a memcpy() followed by LZ4_loadDict(),
  but is much faster, because LZ4_saveDict() doesn't need to rebuild tables.
 @return : saved dictionary size in bytes (necessarily <= maxDictSize), or 0 if error.
 </p></pre><BR>
 <a name="Chapter7"></a><h2>Streaming Decompression Functions</h2><pre>  Bufferless synchronous API
 <BR></pre>
 <pre><b>#if !defined(LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION)
 LZ4_streamDecode_t* LZ4_createStreamDecode(void);
 int                 LZ4_freeStreamDecode (LZ4_streamDecode_t* LZ4_stream);
 #endif </b>/* !defined(LZ4_STATIC_LINKING_ONLY_DISABLE_MEMORY_ALLOCATION) */<b>
 </b><p>  creation / destruction of streaming decompression tracking context.
  A tracking context can be re-used multiple times.
 </p></pre><BR>
 <pre><b>int LZ4_setStreamDecode (LZ4_streamDecode_t* LZ4_streamDecode, const char* dictionary, int dictSize);
 </b><p>  An LZ4_streamDecode_t context can be allocated once and re-used multiple times.
  Use this function to start decompression of a new stream of blocks.
  A dictionary can optionally be set. Use NULL or size 0 for a reset order.
  Dictionary is presumed stable : it must remain accessible and unmodified during next decompression.
 @return : 1 if OK, 0 if error
 </p></pre><BR>
 <pre><b>int LZ4_decoderRingBufferSize(int maxBlockSize);
 #define LZ4_DECODER_RING_BUFFER_SIZE(maxBlockSize) (65536 + 14 + (maxBlockSize))  </b>/* for static allocation; maxBlockSize presumed valid */<b>
 </b><p>  Note : in a ring buffer scenario (optional),
  blocks are presumed decompressed next to each other
  up to the moment there is not enough remaining space for next block (remainingSize < maxBlockSize),
  at which stage it resumes from beginning of ring buffer.
  When setting such a ring buffer for streaming decompression,
  provides the minimum size of this ring buffer
  to be compatible with any source respecting maxBlockSize condition.
 @return : minimum ring buffer size,
           or 0 if there is an error (invalid maxBlockSize).
 </p></pre><BR>
 <pre><b>int
 LZ4_decompress_safe_continue (LZ4_streamDecode_t* LZ4_streamDecode,
                        const char* src, char* dst,
                        int srcSize, int dstCapacity);
 </b><p>  These decoding functions allow decompression of consecutive blocks in "streaming" mode.
  A block is an unsplittable entity, it must be presented entirely to a decompression function.
  Decompression functions only accepts one block at a time.
  The last 64KB of previously decoded data *must* remain available and unmodified at the memory position where they were decoded.
  If less than 64KB of data has been decoded, all the data must be present.
  Special : if decompression side sets a ring buffer, it must respect one of the following conditions :
  - Decompression buffer size is _at least_ LZ4_decoderRingBufferSize(maxBlockSize).
    maxBlockSize is the maximum size of any single block. It can have any value > 16 bytes.
    In which case, encoding and decoding buffers do not need to be synchronized.
    Actually, data can be produced by any source compliant with LZ4 format specification, and respecting maxBlockSize.
  - Synchronized mode :
    Decompression buffer size is _exactly_ the same as compression buffer size,
    and follows exactly same update rule (block boundaries at same positions),
    and decoding function is provided with exact decompressed size of each block (exception for last block of the stream),
    _then_ decoding & encoding ring buffer can have any size, including small ones ( < 64 KB).
  - Decompression buffer is larger than encoding buffer, by a minimum of maxBlockSize more bytes.
    In which case, encoding and decoding buffers do not need to be synchronized,
    and encoding ring buffer can have any size, including small ones ( < 64 KB).
  Whenever these conditions are not possible,
  save the last 64KB of decoded data into a safe buffer where it can't be modified during decompression,
  then indicate where this data is saved using LZ4_setStreamDecode(), before decompressing next block.
 </p></pre><BR>
 <pre><b>int
 LZ4_decompress_safe_usingDict(const char* src, char* dst,
                              int srcSize, int dstCapacity,
                              const char* dictStart, int dictSize);
 </b><p>  These decoding functions work the same as
  a combination of LZ4_setStreamDecode() followed by LZ4_decompress_*_continue()
  They are stand-alone, and don't need an LZ4_streamDecode_t structure.
  Dictionary is presumed stable : it must remain accessible and unmodified during decompression.
  Performance tip : Decompression speed can be substantially increased
                    when dst == dictStart + dictSize.
 </p></pre><BR>
 <a name="Chapter8"></a><h2>Experimental section</h2><pre>
 Symbols declared in this section must be considered unstable. Their
 signatures or semantics may change, or they may be removed altogether in the
 future. They are therefore only safe to depend on when the caller is
 statically linked against the library.
 To protect against unsafe usage, not only are the declarations guarded,
 the definitions are hidden by default
 when building LZ4 as a shared/dynamic library.
 In order to access these declarations,
 define LZ4_STATIC_LINKING_ONLY in your application
 before including LZ4's headers.
 In order to make their implementations accessible dynamically, you must
 define LZ4_PUBLISH_STATIC_FUNCTIONS when building the LZ4 library.
 <BR></pre>
 <pre><b>LZ4LIB_STATIC_API int LZ4_compress_fast_extState_fastReset (void* state, const char* src, char* dst, int srcSize, int dstCapacity, int acceleration);
 </b><p>  A variant of LZ4_compress_fast_extState().
  Using this variant avoids an expensive initialization step.
  It is only safe to call if the state buffer is known to be correctly initialized already
  (see above comment on LZ4_resetStream_fast() for a definition of "correctly initialized").
  From a high level, the difference is that
  this function initializes the provided state with a call to something like LZ4_resetStream_fast()
  while LZ4_compress_fast_extState() starts with a call to LZ4_resetStream().
 </p></pre><BR>
 <pre><b>LZ4LIB_STATIC_API void
 LZ4_attach_dictionary(LZ4_stream_t* workingStream,
                const LZ4_stream_t* dictionaryStream);
 </b><p>  This is an experimental API that allows
  efficient use of a static dictionary many times.
  Rather than re-loading the dictionary buffer into a working context before
  each compression, or copying a pre-loaded dictionary's LZ4_stream_t into a
  working LZ4_stream_t, this function introduces a no-copy setup mechanism,
  in which the working stream references the dictionary stream in-place.
  Several assumptions are made about the state of the dictionary stream.
  Currently, only streams which have been prepared by LZ4_loadDict() should
  be expected to work.
  Alternatively, the provided dictionaryStream may be NULL,
  in which case any existing dictionary stream is unset.
  If a dictionary is provided, it replaces any pre-existing stream history.
  The dictionary contents are the only history that can be referenced and
  logically immediately precede the data compressed in the first subsequent
  compression call.
  The dictionary will only remain attached to the working stream through the
  first compression call, at the end of which it is cleared. The dictionary
  stream (and source buffer) must remain in-place / accessible / unchanged
  through the completion of the first compression call on the stream.
 </p></pre><BR>
 <pre><b></b><p>
 It's possible to have input and output sharing the same buffer,
 for highly constrained memory environments.
 In both cases, it requires input to lay at the end of the buffer,
 and decompression to start at beginning of the buffer.
 Buffer size must feature some margin, hence be larger than final size.
 |<------------------------buffer--------------------------------->|
                             |<-----------compressed data--------->|
 |<-----------decompressed size------------------>|
                                                  |<----margin---->|
 This technique is more useful for decompression,
 since decompressed size is typically larger,
 and margin is short.
 In-place decompression will work inside any buffer
 which size is >= LZ4_DECOMPRESS_INPLACE_BUFFER_SIZE(decompressedSize).
 This presumes that decompressedSize > compressedSize.
 Otherwise, it means compression actually expanded data,
 and it would be more efficient to store such data with a flag indicating it's not compressed.
 This can happen when data is not compressible (already compressed, or encrypted).
 For in-place compression, margin is larger, as it must be able to cope with both
 history preservation, requiring input data to remain unmodified up to LZ4_DISTANCE_MAX,
 and data expansion, which can happen when input is not compressible.
 As a consequence, buffer size requirements are much higher,
 and memory savings offered by in-place compression are more limited.
 There are ways to limit this cost for compression :
 - Reduce history size, by modifying LZ4_DISTANCE_MAX.
   Note that it is a compile-time constant, so all compressions will apply this limit.
   Lower values will reduce compression ratio, except when input_size < LZ4_DISTANCE_MAX,
   so it's a reasonable trick when inputs are known to be small.
 - Require the compressor to deliver a "maximum compressed size".
   This is the `dstCapacity` parameter in `LZ4_compress*()`.
   When this size is < LZ4_COMPRESSBOUND(inputSize), then compression can fail,
   in which case, the return code will be 0 (zero).
   The caller must be ready for these cases to happen,
   and typically design a backup scheme to send data uncompressed.
 The combination of both techniques can significantly reduce
 the amount of margin required for in-place compression.
 In-place compression can work in any buffer
 which size is >= (maxCompressedSize)
 with maxCompressedSize == LZ4_COMPRESSBOUND(srcSize) for guaranteed compression success.
 LZ4_COMPRESS_INPLACE_BUFFER_SIZE() depends on both maxCompressedSize and LZ4_DISTANCE_MAX,
 so it's possible to reduce memory requirements by playing with them.
 </p></pre><BR>
 <pre><b>#define LZ4_DECOMPRESS_INPLACE_BUFFER_SIZE(decompressedSize)   ((decompressedSize) + LZ4_DECOMPRESS_INPLACE_MARGIN(decompressedSize))  </b>/**< note: presumes that compressedSize < decompressedSize. note2: margin is overestimated a bit, since it could use compressedSize instead */<b>
 </b></pre><BR>
 <pre><b>#define LZ4_COMPRESS_INPLACE_BUFFER_SIZE(maxCompressedSize)   ((maxCompressedSize) + LZ4_COMPRESS_INPLACE_MARGIN)  </b>/**< maxCompressedSize is generally LZ4_COMPRESSBOUND(inputSize), but can be set to any lower value, with the risk that compression can fail (return code 0(zero)) */<b>
 </b></pre><BR>
 <a name="Chapter9"></a><h2>Private Definitions</h2><pre>
 Do not use these definitions directly.
 They are only exposed to allow static allocation of `LZ4_stream_t` and `LZ4_streamDecode_t`.
 Accessing members will expose user code to API and/or ABI break in future versions of the library.
 <BR></pre>
 <pre><b></b><p>  Never ever use below internal definitions directly !
  These definitions are not API/ABI safe, and may change in future versions.
  If you need static allocation, declare or allocate an LZ4_stream_t object.
 </p></pre><BR>
 <pre><b>LZ4_stream_t* LZ4_initStream (void* buffer, size_t size);
 </b><p>  An LZ4_stream_t structure must be initialized at least once.
  This is automatically done when invoking LZ4_createStream(),
  but it's not when the structure is simply declared on stack (for example).
  Use LZ4_initStream() to properly initialize a newly declared LZ4_stream_t.
  It can also initialize any arbitrary buffer of sufficient size,
  and will @return a pointer of proper type upon initialization.
  Note : initialization fails if size and alignment conditions are not respected.
         In which case, the function will @return NULL.
  Note2: An LZ4_stream_t structure guarantees correct alignment and size.
  Note3: Before v1.9.0, use LZ4_resetStream() instead
 </p></pre><BR>
 <pre><b>typedef struct {
    const LZ4_byte* externalDict;
    const LZ4_byte* prefixEnd;
    size_t extDictSize;
    size_t prefixSize;
 } LZ4_streamDecode_t_internal;
 </b><p>  Never ever use below internal definitions directly !
  These definitions are not API/ABI safe, and may change in future versions.
  If you need static allocation, declare or allocate an LZ4_streamDecode_t object.
 </p></pre><BR>
 <a name="Chapter10"></a><h2>Obsolete Functions</h2><pre></pre>
 <pre><b>#ifdef LZ4_DISABLE_DEPRECATE_WARNINGS
 #  define LZ4_DEPRECATED(message)   </b>/* disable deprecation warnings */<b>
 #else
 #  if defined (__cplusplus) && (__cplusplus >= 201402) </b>/* C++14 or greater */<b>
 #    define LZ4_DEPRECATED(message) [[deprecated(message)]]
 #  elif defined(_MSC_VER)
 #    define LZ4_DEPRECATED(message) __declspec(deprecated(message))
 #  elif defined(__clang__) || (defined(__GNUC__) && (__GNUC__ * 10 + __GNUC_MINOR__ >= 45))
 #    define LZ4_DEPRECATED(message) __attribute__((deprecated(message)))
 #  elif defined(__GNUC__) && (__GNUC__ * 10 + __GNUC_MINOR__ >= 31)
 #    define LZ4_DEPRECATED(message) __attribute__((deprecated))
 #  else
 #    pragma message("WARNING: LZ4_DEPRECATED needs custom implementation for this compiler")
 #    define LZ4_DEPRECATED(message)   </b>/* disabled */<b>
 #  endif
 #endif </b>/* LZ4_DISABLE_DEPRECATE_WARNINGS */<b>
 </b><p>
  Deprecated functions make the compiler generate a warning when invoked.
  This is meant to invite users to update their source code.
  Should deprecation warnings be a problem, it is generally possible to disable them,
  typically with -Wno-deprecated-declarations for gcc
  or _CRT_SECURE_NO_WARNINGS in Visual.
  Another method is to define LZ4_DISABLE_DEPRECATE_WARNINGS
  before including the header file.
 </p></pre><BR>
 <pre><b>LZ4_DEPRECATED("use LZ4_compress_default() instead")       LZ4LIB_API int LZ4_compress               (const char* src, char* dest, int srcSize);
 LZ4_DEPRECATED("use LZ4_compress_default() instead")       LZ4LIB_API int LZ4_compress_limitedOutput (const char* src, char* dest, int srcSize, int maxOutputSize);
 LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") LZ4LIB_API int LZ4_compress_withState               (void* state, const char* source, char* dest, int inputSize);
 LZ4_DEPRECATED("use LZ4_compress_fast_extState() instead") LZ4LIB_API int LZ4_compress_limitedOutput_withState (void* state, const char* source, char* dest, int inputSize, int maxOutputSize);
 LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") LZ4LIB_API int LZ4_compress_continue                (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize);
 LZ4_DEPRECATED("use LZ4_compress_fast_continue() instead") LZ4LIB_API int LZ4_compress_limitedOutput_continue  (LZ4_stream_t* LZ4_streamPtr, const char* source, char* dest, int inputSize, int maxOutputSize);
 </b><p></p></pre><BR>
 <pre><b>LZ4_DEPRECATED("use LZ4_decompress_fast() instead") LZ4LIB_API int LZ4_uncompress (const char* source, char* dest, int outputSize);
 LZ4_DEPRECATED("use LZ4_decompress_safe() instead") LZ4LIB_API int LZ4_uncompress_unknownOutputSize (const char* source, char* dest, int isize, int maxOutputSize);
 </b><p></p></pre><BR>
 <pre><b>LZ4_DEPRECATED("use LZ4_decompress_safe_usingDict() instead") LZ4LIB_API int LZ4_decompress_safe_withPrefix64k (const char* src, char* dst, int compressedSize, int maxDstSize);
 LZ4_DEPRECATED("use LZ4_decompress_fast_usingDict() instead") LZ4LIB_API int LZ4_decompress_fast_withPrefix64k (const char* src, char* dst, int originalSize);
 </b><p></p></pre><BR>
 <pre><b>LZ4_DEPRECATED("This function is deprecated and unsafe. Consider using LZ4_decompress_safe() instead")
 int LZ4_decompress_fast (const char* src, char* dst, int originalSize);
 LZ4_DEPRECATED("This function is deprecated and unsafe. Consider using LZ4_decompress_safe_continue() instead")
 int LZ4_decompress_fast_continue (LZ4_streamDecode_t* LZ4_streamDecode, const char* src, char* dst, int originalSize);
 LZ4_DEPRECATED("This function is deprecated and unsafe. Consider using LZ4_decompress_safe_usingDict() instead")
 int LZ4_decompress_fast_usingDict (const char* src, char* dst, int originalSize, const char* dictStart, int dictSize);
 </b><p>  These functions used to be faster than LZ4_decompress_safe(),
  but this is no longer the case. They are now slower.
  This is because LZ4_decompress_fast() doesn't know the input size,
  and therefore must progress more cautiously into the input buffer to not read beyond the end of block.
  On top of that `LZ4_decompress_fast()` is not protected vs malformed or malicious inputs, making it a security liability.
  As a consequence, LZ4_decompress_fast() is strongly discouraged, and deprecated.
  The last remaining LZ4_decompress_fast() specificity is that
  it can decompress a block without knowing its compressed size.
  Such functionality can be achieved in a more secure manner
  by employing LZ4_decompress_safe_partial().
  Parameters:
  originalSize : is the uncompressed size to regenerate.
                 `dst` must be already allocated, its size must be >= 'originalSize' bytes.
 @return : number of bytes read from source buffer (== compressed size).
           The function expects to finish at block's end exactly.
           If the source stream is detected malformed, the function stops decoding and returns a negative result.
  note : LZ4_decompress_fast*() requires originalSize. Thanks to this information, it never writes past the output buffer.
         However, since it doesn't know its 'src' size, it may read an unknown amount of input, past input buffer bounds.
         Also, since match offsets are not validated, match reads from 'src' may underflow too.
         These issues never happen if input (compressed) data is correct.
         But they may happen if input data is invalid (error or intentional tampering).
         As a consequence, use these functions in trusted environments with trusted data **only**.
 </p></pre><BR>
 <pre><b>void LZ4_resetStream (LZ4_stream_t* streamPtr);
 </b><p>  An LZ4_stream_t structure must be initialized at least once.
  This is done with LZ4_initStream(), or LZ4_resetStream().
  Consider switching to LZ4_initStream(),
  invoking LZ4_resetStream() will trigger deprecation warnings in the future.
 </p></pre><BR>
 </html>
 </body>
--- a/doc/lz4frame_manual.html
+++ b/doc/lz4frame_manual.html
@ -0,0 +1,455 @@
 <html>
 <head>
 <meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
 <title>1.9.4 Manual</title>
 </head>
 <body>
 <h1>1.9.4 Manual</h1>
 <hr>
 <a name="Contents"></a><h2>Contents</h2>
 <ol>
 <li><a href="#Chapter1">Introduction</a></li>
 <li><a href="#Chapter2">Compiler specifics</a></li>
 <li><a href="#Chapter3">Error management</a></li>
 <li><a href="#Chapter4">Frame compression types</a></li>
 <li><a href="#Chapter5">Simple compression function</a></li>
 <li><a href="#Chapter6">Advanced compression functions</a></li>
 <li><a href="#Chapter7">Resource Management</a></li>
 <li><a href="#Chapter8">Compression</a></li>
 <li><a href="#Chapter9">Decompression functions</a></li>
 <li><a href="#Chapter10">Streaming decompression functions</a></li>
 <li><a href="#Chapter11">Bulk processing dictionary API</a></li>
 </ol>
 <hr>
 <a name="Chapter1"></a><h2>Introduction</h2><pre>
 lz4frame.h implements LZ4 frame specification: see doc/lz4_Frame_format.md .
 LZ4 Frames are compatible with `lz4` CLI,
 and designed to be interoperable with any system.
 <BR></pre>
 <a name="Chapter2"></a><h2>Compiler specifics</h2><pre></pre>
 <a name="Chapter3"></a><h2>Error management</h2><pre></pre>
 <pre><b>unsigned    LZ4F_isError(LZ4F_errorCode_t code);   </b>/**< tells when a function result is an error code */<b>
 </b></pre><BR>
 <pre><b>const char* LZ4F_getErrorName(LZ4F_errorCode_t code);   </b>/**< return error code string; for debugging */<b>
 </b></pre><BR>
 <a name="Chapter4"></a><h2>Frame compression types</h2><pre> 
 <BR></pre>
 <pre><b>typedef enum {
    LZ4F_default=0,
    LZ4F_max64KB=4,
    LZ4F_max256KB=5,
    LZ4F_max1MB=6,
    LZ4F_max4MB=7
    LZ4F_OBSOLETE_ENUM(max64KB)
    LZ4F_OBSOLETE_ENUM(max256KB)
    LZ4F_OBSOLETE_ENUM(max1MB)
    LZ4F_OBSOLETE_ENUM(max4MB)
 } LZ4F_blockSizeID_t;
 </b></pre><BR>
 <pre><b>typedef enum {
    LZ4F_blockLinked=0,
    LZ4F_blockIndependent
    LZ4F_OBSOLETE_ENUM(blockLinked)
    LZ4F_OBSOLETE_ENUM(blockIndependent)
 } LZ4F_blockMode_t;
 </b></pre><BR>
 <pre><b>typedef enum {
    LZ4F_noContentChecksum=0,
    LZ4F_contentChecksumEnabled
    LZ4F_OBSOLETE_ENUM(noContentChecksum)
    LZ4F_OBSOLETE_ENUM(contentChecksumEnabled)
 } LZ4F_contentChecksum_t;
 </b></pre><BR>
 <pre><b>typedef enum {
    LZ4F_noBlockChecksum=0,
    LZ4F_blockChecksumEnabled
 } LZ4F_blockChecksum_t;
 </b></pre><BR>
 <pre><b>typedef enum {
    LZ4F_frame=0,
    LZ4F_skippableFrame
    LZ4F_OBSOLETE_ENUM(skippableFrame)
 } LZ4F_frameType_t;
 </b></pre><BR>
 <pre><b>typedef struct {
  LZ4F_blockSizeID_t     blockSizeID;         </b>/* max64KB, max256KB, max1MB, max4MB; 0 == default */<b>
  LZ4F_blockMode_t       blockMode;           </b>/* LZ4F_blockLinked, LZ4F_blockIndependent; 0 == default */<b>
  LZ4F_contentChecksum_t contentChecksumFlag; </b>/* 1: frame terminated with 32-bit checksum of decompressed data; 0: disabled (default) */<b>
  LZ4F_frameType_t       frameType;           </b>/* read-only field : LZ4F_frame or LZ4F_skippableFrame */<b>
  unsigned long long     contentSize;         </b>/* Size of uncompressed content ; 0 == unknown */<b>
  unsigned               dictID;              </b>/* Dictionary ID, sent by compressor to help decoder select correct dictionary; 0 == no dictID provided */<b>
  LZ4F_blockChecksum_t   blockChecksumFlag;   </b>/* 1: each block followed by a checksum of block's compressed data; 0: disabled (default) */<b>
 } LZ4F_frameInfo_t;
 </b><p>  makes it possible to set or read frame parameters.
  Structure must be first init to 0, using memset() or LZ4F_INIT_FRAMEINFO,
  setting all parameters to default.
  It's then possible to update selectively some parameters 
 </p></pre><BR>
 <pre><b>typedef struct {
  LZ4F_frameInfo_t frameInfo;
  int      compressionLevel;    </b>/* 0: default (fast mode); values > LZ4HC_CLEVEL_MAX count as LZ4HC_CLEVEL_MAX; values < 0 trigger "fast acceleration" */<b>
  unsigned autoFlush;           </b>/* 1: always flush; reduces usage of internal buffers */<b>
  unsigned favorDecSpeed;       </b>/* 1: parser favors decompression speed vs compression ratio. Only works for high compression modes (>= LZ4HC_CLEVEL_OPT_MIN) */  /* v1.8.2+ */<b>
  unsigned reserved[3];         </b>/* must be zero for forward compatibility */<b>
 } LZ4F_preferences_t;
 </b><p>  makes it possible to supply advanced compression instructions to streaming interface.
  Structure must be first init to 0, using memset() or LZ4F_INIT_PREFERENCES,
  setting all parameters to default.
  All reserved fields must be set to zero. 
 </p></pre><BR>
 <a name="Chapter5"></a><h2>Simple compression function</h2><pre></pre>
 <pre><b>size_t LZ4F_compressFrameBound(size_t srcSize, const LZ4F_preferences_t* preferencesPtr);
 </b><p>  Returns the maximum possible compressed size with LZ4F_compressFrame() given srcSize and preferences.
 `preferencesPtr` is optional. It can be replaced by NULL, in which case, the function will assume default preferences.
  Note : this result is only usable with LZ4F_compressFrame().
         It may also be relevant to LZ4F_compressUpdate() _only if_ no flush() operation is ever performed.
 </p></pre><BR>
 <pre><b>size_t LZ4F_compressFrame(void* dstBuffer, size_t dstCapacity,
                                const void* srcBuffer, size_t srcSize,
                                const LZ4F_preferences_t* preferencesPtr);
 </b><p>  Compress an entire srcBuffer into a valid LZ4 frame.
  dstCapacity MUST be >= LZ4F_compressFrameBound(srcSize, preferencesPtr).
  The LZ4F_preferences_t structure is optional : you can provide NULL as argument. All preferences will be set to default.
 @return : number of bytes written into dstBuffer.
           or an error code if it fails (can be tested using LZ4F_isError())
 </p></pre><BR>
 <a name="Chapter6"></a><h2>Advanced compression functions</h2><pre></pre>
 <pre><b>typedef struct {
  unsigned stableSrc;    </b>/* 1 == src content will remain present on future calls to LZ4F_compress(); skip copying src content within tmp buffer */<b>
  unsigned reserved[3];
 } LZ4F_compressOptions_t;
 </b></pre><BR>
 <a name="Chapter7"></a><h2>Resource Management</h2><pre></pre>
 <pre><b>LZ4F_errorCode_t LZ4F_createCompressionContext(LZ4F_cctx** cctxPtr, unsigned version);
 LZ4F_errorCode_t LZ4F_freeCompressionContext(LZ4F_cctx* cctx);
 </b><p>  The first thing to do is to create a compressionContext object,
  which will keep track of operation state during streaming compression.
  This is achieved using LZ4F_createCompressionContext(), which takes as argument a version,
  and a pointer to LZ4F_cctx*, to write the resulting pointer into.
  @version provided MUST be LZ4F_VERSION. It is intended to track potential version mismatch, notably when using DLL.
  The function provides a pointer to a fully allocated LZ4F_cctx object.
  @cctxPtr MUST be != NULL.
  If @return != zero, context creation failed.
  A created compression context can be employed multiple times for consecutive streaming operations.
  Once all streaming compression jobs are completed,
  the state object can be released using LZ4F_freeCompressionContext().
  Note1 : LZ4F_freeCompressionContext() is always successful. Its return value can be ignored.
  Note2 : LZ4F_freeCompressionContext() works fine with NULL input pointers (do nothing).
 </p></pre><BR>
 <a name="Chapter8"></a><h2>Compression</h2><pre></pre>
 <pre><b>size_t LZ4F_compressBegin(LZ4F_cctx* cctx,
                                      void* dstBuffer, size_t dstCapacity,
                                      const LZ4F_preferences_t* prefsPtr);
 </b><p>  will write the frame header into dstBuffer.
  dstCapacity must be >= LZ4F_HEADER_SIZE_MAX bytes.
 `prefsPtr` is optional : you can provide NULL as argument, all preferences will then be set to default.
 @return : number of bytes written into dstBuffer for the header
           or an error code (which can be tested using LZ4F_isError())
 </p></pre><BR>
 <pre><b>size_t LZ4F_compressBound(size_t srcSize, const LZ4F_preferences_t* prefsPtr);
 </b><p>  Provides minimum dstCapacity required to guarantee success of
  LZ4F_compressUpdate(), given a srcSize and preferences, for a worst case scenario.
  When srcSize==0, LZ4F_compressBound() provides an upper bound for LZ4F_flush() and LZ4F_compressEnd() instead.
  Note that the result is only valid for a single invocation of LZ4F_compressUpdate().
  When invoking LZ4F_compressUpdate() multiple times,
  if the output buffer is gradually filled up instead of emptied and re-used from its start,
  one must check if there is enough remaining capacity before each invocation, using LZ4F_compressBound().
 @return is always the same for a srcSize and prefsPtr.
  prefsPtr is optional : when NULL is provided, preferences will be set to cover worst case scenario.
  tech details :
 @return if automatic flushing is not enabled, includes the possibility that internal buffer might already be filled by up to (blockSize-1) bytes.
  It also includes frame footer (ending + checksum), since it might be generated by LZ4F_compressEnd().
 @return doesn't include frame header, as it was already generated by LZ4F_compressBegin().
 </p></pre><BR>
 <pre><b>size_t LZ4F_compressUpdate(LZ4F_cctx* cctx,
                                       void* dstBuffer, size_t dstCapacity,
                                 const void* srcBuffer, size_t srcSize,
                                 const LZ4F_compressOptions_t* cOptPtr);
 </b><p>  LZ4F_compressUpdate() can be called repetitively to compress as much data as necessary.
  Important rule: dstCapacity MUST be large enough to ensure operation success even in worst case situations.
  This value is provided by LZ4F_compressBound().
  If this condition is not respected, LZ4F_compress() will fail (result is an errorCode).
  After an error, the state is left in a UB state, and must be re-initialized or freed.
  If previously an uncompressed block was written, buffered data is flushed
  before appending compressed data is continued.
 `cOptPtr` is optional : NULL can be provided, in which case all options are set to default.
 @return : number of bytes written into `dstBuffer` (it can be zero, meaning input data was just buffered).
           or an error code if it fails (which can be tested using LZ4F_isError())
 </p></pre><BR>
 <pre><b>size_t LZ4F_flush(LZ4F_cctx* cctx,
                              void* dstBuffer, size_t dstCapacity,
                        const LZ4F_compressOptions_t* cOptPtr);
 </b><p>  When data must be generated and sent immediately, without waiting for a block to be completely filled,
  it's possible to call LZ4_flush(). It will immediately compress any data buffered within cctx.
 `dstCapacity` must be large enough to ensure the operation will be successful.
 `cOptPtr` is optional : it's possible to provide NULL, all options will be set to default.
 @return : nb of bytes written into dstBuffer (can be zero, when there is no data stored within cctx)
           or an error code if it fails (which can be tested using LZ4F_isError())
  Note : LZ4F_flush() is guaranteed to be successful when dstCapacity >= LZ4F_compressBound(0, prefsPtr).
 </p></pre><BR>
 <pre><b>size_t LZ4F_compressEnd(LZ4F_cctx* cctx,
                                    void* dstBuffer, size_t dstCapacity,
                              const LZ4F_compressOptions_t* cOptPtr);
 </b><p>  To properly finish an LZ4 frame, invoke LZ4F_compressEnd().
  It will flush whatever data remained within `cctx` (like LZ4_flush())
  and properly finalize the frame, with an endMark and a checksum.
 `cOptPtr` is optional : NULL can be provided, in which case all options will be set to default.
 @return : nb of bytes written into dstBuffer, necessarily >= 4 (endMark),
           or an error code if it fails (which can be tested using LZ4F_isError())
  Note : LZ4F_compressEnd() is guaranteed to be successful when dstCapacity >= LZ4F_compressBound(0, prefsPtr).
  A successful call to LZ4F_compressEnd() makes `cctx` available again for another compression task.
 </p></pre><BR>
 <a name="Chapter9"></a><h2>Decompression functions</h2><pre></pre>
 <pre><b>typedef struct {
  unsigned stableDst;     /* pledges that last 64KB decompressed data will remain available unmodified between invocations.
                           * This optimization skips storage operations in tmp buffers. */
  unsigned skipChecksums; /* disable checksum calculation and verification, even when one is present in frame, to save CPU time.
                           * Setting this option to 1 once disables all checksums for the rest of the frame. */
  unsigned reserved1;     </b>/* must be set to zero for forward compatibility */<b>
  unsigned reserved0;     </b>/* idem */<b>
 } LZ4F_decompressOptions_t;
 </b></pre><BR>
 <pre><b>LZ4F_errorCode_t LZ4F_createDecompressionContext(LZ4F_dctx** dctxPtr, unsigned version);
 LZ4F_errorCode_t LZ4F_freeDecompressionContext(LZ4F_dctx* dctx);
 </b><p>  Create an LZ4F_dctx object, to track all decompression operations.
  @version provided MUST be LZ4F_VERSION.
  @dctxPtr MUST be valid.
  The function fills @dctxPtr with the value of a pointer to an allocated and initialized LZ4F_dctx object.
  The @return is an errorCode, which can be tested using LZ4F_isError().
  dctx memory can be released using LZ4F_freeDecompressionContext();
  Result of LZ4F_freeDecompressionContext() indicates current state of decompressionContext when being released.
  That is, it should be == 0 if decompression has been completed fully and correctly.
 </p></pre><BR>
 <a name="Chapter10"></a><h2>Streaming decompression functions</h2><pre></pre>
 <pre><b>size_t LZ4F_headerSize(const void* src, size_t srcSize);
 </b><p>  Provide the header size of a frame starting at `src`.
 `srcSize` must be >= LZ4F_MIN_SIZE_TO_KNOW_HEADER_LENGTH,
  which is enough to decode the header length.
 @return : size of frame header
           or an error code, which can be tested using LZ4F_isError()
  note : Frame header size is variable, but is guaranteed to be
         >= LZ4F_HEADER_SIZE_MIN bytes, and <= LZ4F_HEADER_SIZE_MAX bytes.
 </p></pre><BR>
 <pre><b>size_t
 LZ4F_getFrameInfo(LZ4F_dctx* dctx,
                  LZ4F_frameInfo_t* frameInfoPtr,
            const void* srcBuffer, size_t* srcSizePtr);
 </b><p>  This function extracts frame parameters (max blockSize, dictID, etc.).
  Its usage is optional: user can also invoke LZ4F_decompress() directly.
  Extracted information will fill an existing LZ4F_frameInfo_t structure.
  This can be useful for allocation and dictionary identification purposes.
  LZ4F_getFrameInfo() can work in the following situations :
  1) At the beginning of a new frame, before any invocation of LZ4F_decompress().
     It will decode header from `srcBuffer`,
     consuming the header and starting the decoding process.
     Input size must be large enough to contain the full frame header.
     Frame header size can be known beforehand by LZ4F_headerSize().
     Frame header size is variable, but is guaranteed to be >= LZ4F_HEADER_SIZE_MIN bytes,
     and not more than <= LZ4F_HEADER_SIZE_MAX bytes.
     Hence, blindly providing LZ4F_HEADER_SIZE_MAX bytes or more will always work.
     It's allowed to provide more input data than the header size,
     LZ4F_getFrameInfo() will only consume the header.
     If input size is not large enough,
     aka if it's smaller than header size,
     function will fail and return an error code.
  2) After decoding has been started,
     it's possible to invoke LZ4F_getFrameInfo() anytime
     to extract already decoded frame parameters stored within dctx.
     Note that, if decoding has barely started,
     and not yet read enough information to decode the header,
     LZ4F_getFrameInfo() will fail.
  The number of bytes consumed from srcBuffer will be updated in *srcSizePtr (necessarily <= original value).
  LZ4F_getFrameInfo() only consumes bytes when decoding has not yet started,
  and when decoding the header has been successful.
  Decompression must then resume from (srcBuffer + *srcSizePtr).
 @return : a hint about how many srcSize bytes LZ4F_decompress() expects for next call,
           or an error code which can be tested using LZ4F_isError().
  note 1 : in case of error, dctx is not modified. Decoding operation can resume from beginning safely.
  note 2 : frame parameters are *copied into* an already allocated LZ4F_frameInfo_t structure.
 </p></pre><BR>
 <pre><b>size_t
 LZ4F_decompress(LZ4F_dctx* dctx,
                void* dstBuffer, size_t* dstSizePtr,
          const void* srcBuffer, size_t* srcSizePtr,
          const LZ4F_decompressOptions_t* dOptPtr);
 </b><p>  Call this function repetitively to regenerate data compressed in `srcBuffer`.
  The function requires a valid dctx state.
  It will read up to *srcSizePtr bytes from srcBuffer,
  and decompress data into dstBuffer, of capacity *dstSizePtr.
  The nb of bytes consumed from srcBuffer will be written into *srcSizePtr (necessarily <= original value).
  The nb of bytes decompressed into dstBuffer will be written into *dstSizePtr (necessarily <= original value).
  The function does not necessarily read all input bytes, so always check value in *srcSizePtr.
  Unconsumed source data must be presented again in subsequent invocations.
 `dstBuffer` can freely change between each consecutive function invocation.
 `dstBuffer` content will be overwritten.
 @return : an hint of how many `srcSize` bytes LZ4F_decompress() expects for next call.
  Schematically, it's the size of the current (or remaining) compressed block + header of next block.
  Respecting the hint provides some small speed benefit, because it skips intermediate buffers.
  This is just a hint though, it's always possible to provide any srcSize.
  When a frame is fully decoded, @return will be 0 (no more data expected).
  When provided with more bytes than necessary to decode a frame,
  LZ4F_decompress() will stop reading exactly at end of current frame, and @return 0.
  If decompression failed, @return is an error code, which can be tested using LZ4F_isError().
  After a decompression error, the `dctx` context is not resumable.
  Use LZ4F_resetDecompressionContext() to return to clean state.
  After a frame is fully decoded, dctx can be used again to decompress another frame.
 </p></pre><BR>
 <pre><b>void LZ4F_resetDecompressionContext(LZ4F_dctx* dctx);   </b>/* always successful */<b>
 </b><p>  In case of an error, the context is left in "undefined" state.
  In which case, it's necessary to reset it, before re-using it.
  This method can also be used to abruptly stop any unfinished decompression,
  and start a new one using same context resources. 
 </p></pre><BR>
 <pre><b>typedef enum { LZ4F_LIST_ERRORS(LZ4F_GENERATE_ENUM)
              _LZ4F_dummy_error_enum_for_c89_never_used } LZ4F_errorCodes;
 </b></pre><BR>
 <pre><b>LZ4FLIB_STATIC_API size_t LZ4F_getBlockSize(LZ4F_blockSizeID_t blockSizeID);
 </b><p>  Return, in scalar format (size_t),
  the maximum block size associated with blockSizeID.
 </p></pre><BR>
 <pre><b>LZ4FLIB_STATIC_API size_t
 LZ4F_uncompressedUpdate(LZ4F_cctx* cctx,
                        void* dstBuffer, size_t dstCapacity,
                  const void* srcBuffer, size_t srcSize,
                  const LZ4F_compressOptions_t* cOptPtr);
 </b><p>  LZ4F_uncompressedUpdate() can be called repetitively to add as much data uncompressed data as necessary.
  Important rule: dstCapacity MUST be large enough to store the entire source buffer as
  no compression is done for this operation
  If this condition is not respected, LZ4F_uncompressedUpdate() will fail (result is an errorCode).
  After an error, the state is left in a UB state, and must be re-initialized or freed.
  If previously a compressed block was written, buffered data is flushed
  before appending uncompressed data is continued.
  This is only supported when LZ4F_blockIndependent is used
 `cOptPtr` is optional : NULL can be provided, in which case all options are set to default.
 @return : number of bytes written into `dstBuffer` (it can be zero, meaning input data was just buffered).
           or an error code if it fails (which can be tested using LZ4F_isError())
 </p></pre><BR>
 <a name="Chapter11"></a><h2>Bulk processing dictionary API</h2><pre></pre>
 <pre><b>LZ4FLIB_STATIC_API LZ4F_CDict* LZ4F_createCDict(const void* dictBuffer, size_t dictSize);
 LZ4FLIB_STATIC_API void        LZ4F_freeCDict(LZ4F_CDict* CDict);
 </b><p>  When compressing multiple messages / blocks using the same dictionary, it's recommended to load it just once.
  LZ4_createCDict() will create a digested dictionary, ready to start future compression operations without startup delay.
  LZ4_CDict can be created once and shared by multiple threads concurrently, since its usage is read-only.
 `dictBuffer` can be released after LZ4_CDict creation, since its content is copied within CDict 
 </p></pre><BR>
 <pre><b>LZ4FLIB_STATIC_API size_t
 LZ4F_compressFrame_usingCDict(LZ4F_cctx* cctx,
                              void* dst, size_t dstCapacity,
                        const void* src, size_t srcSize,
                        const LZ4F_CDict* cdict,
                        const LZ4F_preferences_t* preferencesPtr);
 </b><p>  Compress an entire srcBuffer into a valid LZ4 frame using a digested Dictionary.
  cctx must point to a context created by LZ4F_createCompressionContext().
  If cdict==NULL, compress without a dictionary.
  dstBuffer MUST be >= LZ4F_compressFrameBound(srcSize, preferencesPtr).
  If this condition is not respected, function will fail (@return an errorCode).
  The LZ4F_preferences_t structure is optional : you may provide NULL as argument,
  but it's not recommended, as it's the only way to provide dictID in the frame header.
 @return : number of bytes written into dstBuffer.
           or an error code if it fails (can be tested using LZ4F_isError()) 
 </p></pre><BR>
 <pre><b>LZ4FLIB_STATIC_API size_t
 LZ4F_compressBegin_usingCDict(LZ4F_cctx* cctx,
                              void* dstBuffer, size_t dstCapacity,
                        const LZ4F_CDict* cdict,
                        const LZ4F_preferences_t* prefsPtr);
 </b><p>  Inits streaming dictionary compression, and writes the frame header into dstBuffer.
  dstCapacity must be >= LZ4F_HEADER_SIZE_MAX bytes.
 `prefsPtr` is optional : you may provide NULL as argument,
  however, it's the only way to provide dictID in the frame header.
 @return : number of bytes written into dstBuffer for the header,
           or an error code (which can be tested using LZ4F_isError()) 
 </p></pre><BR>
 <pre><b>LZ4FLIB_STATIC_API size_t
 LZ4F_decompress_usingDict(LZ4F_dctx* dctxPtr,
                          void* dstBuffer, size_t* dstSizePtr,
                    const void* srcBuffer, size_t* srcSizePtr,
                    const void* dict, size_t dictSize,
                    const LZ4F_decompressOptions_t* decompressOptionsPtr);
 </b><p>  Same as LZ4F_decompress(), using a predefined dictionary.
  Dictionary is used "in place", without any preprocessing.
  It must remain accessible throughout the entire frame decoding. 
 </p></pre><BR>
 <pre><b>typedef void* (*LZ4F_AllocFunction) (void* opaqueState, size_t size);
 typedef void* (*LZ4F_CallocFunction) (void* opaqueState, size_t size);
 typedef void  (*LZ4F_FreeFunction) (void* opaqueState, void* address);
 typedef struct {
    LZ4F_AllocFunction customAlloc;
    LZ4F_CallocFunction customCalloc; </b>/* optional; when not defined, uses customAlloc + memset */<b>
    LZ4F_FreeFunction customFree;
    void* opaqueState;
 } LZ4F_CustomMem;
 static
 #ifdef __GNUC__
 __attribute__((__unused__))
 #endif
 LZ4F_CustomMem const LZ4F_defaultCMem = { NULL, NULL, NULL, NULL };  </b>/**< this constant defers to stdlib's functions */<b>
 </b><p>  These prototypes make it possible to pass custom allocation/free functions.
  LZ4F_customMem is provided at state creation time, using LZ4F_create*_advanced() listed below.
  All allocation/free operations will be completed using these custom variants instead of regular <stdlib.h> ones.
 </p></pre><BR>
 </html>
 </body>
--- a/examples/.gitignore
+++ b/examples/.gitignore
@ -0,0 +1,11 @@
 /Makefile.lz4*
 /printVersion
 /doubleBuffer
 /dictionaryRandomAccess
 /ringBuffer
 /ringBufferHC
 /lineCompress
 /frameCompress
 /fileCompress
 /simpleBuffer
 /*.exe
--- a/examples/COPYING
+++ b/examples/COPYING
@ -0,0 +1,339 @@
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    <one line to give the program's name and a brief idea of what it does.>
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 Also add information on how to contact you by electronic and paper mail.
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 Public License instead of this License.
--- a/examples/HCStreaming_ringBuffer.c
+++ b/examples/HCStreaming_ringBuffer.c
@ -0,0 +1,232 @@
 // LZ4 HC streaming API example : ring buffer
 // Based on a previous example by Takayuki Matsuoka
 /**************************************
 * Compiler Options
 **************************************/
 #if defined(_MSC_VER) && (_MSC_VER <= 1800)  /* Visual Studio <= 2013 */
 #  define _CRT_SECURE_NO_WARNINGS
 #  define snprintf sprintf_s
 #endif
 #define GCC_VERSION (__GNUC__ * 100 + __GNUC_MINOR__)
 #ifdef __GNUC__
 #  pragma GCC diagnostic ignored "-Wmissing-braces"   /* GCC bug 53119 : doesn't accept { 0 } as initializer (https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53119) */
 #endif
 /**************************************
 * Includes
 **************************************/
 #include "lz4hc.h"
 #include "lz4.h"
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>
 enum {
    MESSAGE_MAX_BYTES   = 1024,
    RING_BUFFER_BYTES   = 1024 * 8 + MESSAGE_MAX_BYTES,
    DEC_BUFFER_BYTES    = RING_BUFFER_BYTES + MESSAGE_MAX_BYTES   // Intentionally larger to test unsynchronized ring buffers
 };
 size_t write_int32(FILE* fp, int32_t i) {
    return fwrite(&i, sizeof(i), 1, fp);
 }
 size_t write_bin(FILE* fp, const void* array, int arrayBytes) {
    assert(arrayBytes >= 0);
    return fwrite(array, 1, (size_t)arrayBytes, fp);
 }
 size_t read_int32(FILE* fp, int32_t* i) {
    return fread(i, sizeof(*i), 1, fp);
 }
 size_t read_bin(FILE* fp, void* array, int arrayBytes) {
    assert(arrayBytes >= 0);
    return fread(array, 1, (size_t)arrayBytes, fp);
 }
 void test_compress(FILE* outFp, FILE* inpFp)
 {
    LZ4_streamHC_t lz4Stream_body = { 0 };
    LZ4_streamHC_t* lz4Stream = &lz4Stream_body;
    static char inpBuf[RING_BUFFER_BYTES];
    int inpOffset = 0;
    for(;;) {
        // Read random length ([1,MESSAGE_MAX_BYTES]) data to the ring buffer.
        char* const inpPtr = &inpBuf[inpOffset];
        const int randomLength = (rand() % MESSAGE_MAX_BYTES) + 1;
        const int inpBytes = (int) read_bin(inpFp, inpPtr, randomLength);
        if (0 == inpBytes) break;
 #define CMPBUFSIZE (LZ4_COMPRESSBOUND(MESSAGE_MAX_BYTES))
        {   char cmpBuf[CMPBUFSIZE];
            const int cmpBytes = LZ4_compress_HC_continue(lz4Stream, inpPtr, cmpBuf, inpBytes, CMPBUFSIZE);
            if(cmpBytes <= 0) break;
            write_int32(outFp, cmpBytes);
            write_bin(outFp, cmpBuf, cmpBytes);
            inpOffset += inpBytes;
            // Wraparound the ringbuffer offset
            if(inpOffset >= RING_BUFFER_BYTES - MESSAGE_MAX_BYTES)
                inpOffset = 0;
        }
    }
    write_int32(outFp, 0);
 }
 void test_decompress(FILE* outFp, FILE* inpFp)
 {
    static char decBuf[DEC_BUFFER_BYTES];
    int decOffset = 0;
    LZ4_streamDecode_t lz4StreamDecode_body = { 0 };
    LZ4_streamDecode_t* lz4StreamDecode = &lz4StreamDecode_body;
    for(;;) {
        int  cmpBytes = 0;
        char cmpBuf[CMPBUFSIZE];
        {   const size_t r0 = read_int32(inpFp, &cmpBytes);
            size_t r1;
            if(r0 != 1 || cmpBytes <= 0)
                break;
            r1 = read_bin(inpFp, cmpBuf, cmpBytes);
            if(r1 != (size_t) cmpBytes)
                break;
        }
        {   char* const decPtr = &decBuf[decOffset];
            const int decBytes = LZ4_decompress_safe_continue(
                lz4StreamDecode, cmpBuf, decPtr, cmpBytes, MESSAGE_MAX_BYTES);
            if(decBytes <= 0)
                break;
            decOffset += decBytes;
            write_bin(outFp, decPtr, decBytes);
            // Wraparound the ringbuffer offset
            if(decOffset >= DEC_BUFFER_BYTES - MESSAGE_MAX_BYTES)
                decOffset = 0;
        }
    }
 }
 // Compare 2 files content
 // return 0 if identical
 // return ByteNb>0 if different
 size_t compare(FILE* f0, FILE* f1)
 {
    size_t result = 1;
    for (;;) {
        char b0[65536];
        char b1[65536];
        const size_t r0 = fread(b0, 1, sizeof(b0), f0);
        const size_t r1 = fread(b1, 1, sizeof(b1), f1);
        if ((r0==0) && (r1==0)) return 0;   // success
        if (r0 != r1) {
            size_t smallest = r0;
            if (r1<r0) smallest = r1;
            result += smallest;
            break;
        }
        if (memcmp(b0, b1, r0)) {
            unsigned errorPos = 0;
            while ((errorPos < r0) && (b0[errorPos]==b1[errorPos])) errorPos++;
            result += errorPos;
            break;
        }
        result += sizeof(b0);
    }
    return result;
 }
 int main(int argc, const char** argv)
 {
    char inpFilename[256] = { 0 };
    char lz4Filename[256] = { 0 };
    char decFilename[256] = { 0 };
    unsigned fileID = 1;
    unsigned pause = 0;
    if(argc < 2) {
        printf("Please specify input filename\n");
        return 0;
    }
    if (!strcmp(argv[1], "-p")) { pause = 1; fileID = 2; }
    snprintf(inpFilename, 256, "%s", argv[fileID]);
    snprintf(lz4Filename, 256, "%s.lz4s-%d", argv[fileID], 9);
    snprintf(decFilename, 256, "%s.lz4s-%d.dec", argv[fileID], 9);
    printf("input   = [%s]\n", inpFilename);
    printf("lz4     = [%s]\n", lz4Filename);
    printf("decoded = [%s]\n", decFilename);
    // compress
    {   FILE* const inpFp = fopen(inpFilename, "rb");
        FILE* const outFp = fopen(lz4Filename, "wb");
        test_compress(outFp, inpFp);
        fclose(outFp);
        fclose(inpFp);
    }
    // decompress
    {   FILE* const inpFp = fopen(lz4Filename, "rb");
        FILE* const outFp = fopen(decFilename, "wb");
        test_decompress(outFp, inpFp);
        fclose(outFp);
        fclose(inpFp);
    }
    // verify
    {   FILE* const inpFp = fopen(inpFilename, "rb");
        FILE* const decFp = fopen(decFilename, "rb");
        const size_t cmp = compare(inpFp, decFp);
        if(0 == cmp) {
            printf("Verify : OK\n");
        } else {
            printf("Verify : NG : error at pos %u\n", (unsigned)cmp-1);
        }
        fclose(decFp);
        fclose(inpFp);
    }
    if (pause) {
        int unused;
        printf("Press enter to continue ...\n");
        unused = getchar(); (void)unused;   /* silence static analyzer */
    }
    return 0;
 }
--- a/examples/Makefile
+++ b/examples/Makefile
@ -0,0 +1,114 @@
 # ##########################################################################
 # LZ4 examples - Makefile
 # Copyright (C) Yann Collet 2011-2020
 #
 # GPL v2 License
 #
 # 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 of the License, 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.
 #
 # You should have received a copy of the GNU General Public License along
 # with this program; if not, write to the Free Software Foundation, Inc.,
 # 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 #
 # You can contact the author at :
 #  - LZ4 source repository : https://github.com/lz4/lz4
 #  - LZ4 forum froup : https://groups.google.com/forum/#!forum/lz4c
 # ##########################################################################
 # This makefile compile and test
 # example programs, using (mostly) LZ4 streaming library,
 # kindly provided by Takayuki Matsuoka
 # ##########################################################################
 CPPFLAGS += -I../lib
 CFLAGS   ?= -O3
 CFLAGS   += -std=gnu99 -Wall -Wextra -Wundef -Wshadow -Wcast-align -Wstrict-prototypes
 FLAGS    := $(CPPFLAGS) $(CFLAGS) $(LDFLAGS) $(MOREFLAGS)
 TESTFILE  = Makefile
 LZ4DIR   := ../lib
 LZ4       = ../programs/lz4
 include ../Makefile.inc
 default: all
 all: printVersion doubleBuffer dictionaryRandomAccess ringBuffer ringBufferHC \
     lineCompress frameCompress fileCompress simpleBuffer
 $(LZ4DIR)/liblz4.a: $(LZ4DIR)/lz4.c $(LZ4DIR)/lz4hc.c $(LZ4DIR)/lz4frame.c $(LZ4DIR)/lz4.h $(LZ4DIR)/lz4hc.h $(LZ4DIR)/lz4frame.h $(LZ4DIR)/lz4frame_static.h
 	$(MAKE) -C $(LZ4DIR) liblz4.a
 printVersion: printVersion.c $(LZ4DIR)/liblz4.a
 	$(CC) $(FLAGS) $^ -o $@$(EXT)
 doubleBuffer: blockStreaming_doubleBuffer.c $(LZ4DIR)/liblz4.a
 	$(CC) $(FLAGS) $^ -o $@$(EXT)
 dictionaryRandomAccess: dictionaryRandomAccess.c $(LZ4DIR)/liblz4.a
 	$(CC) $(FLAGS) $^ -o $@$(EXT)
 ringBuffer  : blockStreaming_ringBuffer.c $(LZ4DIR)/liblz4.a
 	$(CC) $(FLAGS) $^ -o $@$(EXT)
 ringBufferHC: HCStreaming_ringBuffer.c $(LZ4DIR)/liblz4.a
 	$(CC) $(FLAGS) $^ -o $@$(EXT)
 lineCompress: blockStreaming_lineByLine.c $(LZ4DIR)/liblz4.a
 	$(CC) $(FLAGS) $^ -o $@$(EXT)
 frameCompress: frameCompress.c $(LZ4DIR)/liblz4.a
 	$(CC) $(FLAGS) $^ -o $@$(EXT)
 fileCompress: fileCompress.c $(LZ4DIR)/liblz4.a
 	$(CC) $(FLAGS) $^ -o $@$(EXT)
 compressFunctions: compress_functions.c $(LZ4DIR)/liblz4.a
 	$(CC) $(FLAGS) $^ -o $@$(EXT) -lrt
 simpleBuffer: simple_buffer.c $(LZ4DIR)/liblz4.a
 	$(CC) $(FLAGS) $^ -o $@$(EXT)
 $(LZ4) :
 	$(MAKE) -C ../programs lz4
 test : all $(LZ4)
 	@echo "\n=== Print Version ==="
 	./printVersion$(EXT)
 	@echo "\n=== Simple compression example ==="
 	./simpleBuffer$(EXT)
 	@echo "\n=== Double-buffer ==="
 	./doubleBuffer$(EXT) $(TESTFILE)
 	@echo "\n=== Ring Buffer ==="
 	./ringBuffer$(EXT)   $(TESTFILE)
 	@echo "\n=== Ring Buffer + LZ4 HC ==="
 	./ringBufferHC$(EXT) $(TESTFILE)
 	@echo "\n=== Compress line by line ==="
 	./lineCompress$(EXT) $(TESTFILE)
 	@echo "\n=== Dictionary Random Access ==="
 	./dictionaryRandomAccess$(EXT) $(TESTFILE) $(TESTFILE) 1100 1400
 	@echo "\n=== Frame compression ==="
 	./frameCompress$(EXT) $(TESTFILE)
 	$(LZ4) -vt $(TESTFILE).lz4
 	@echo "\n=== file compression ==="
 	./fileCompress$(EXT) $(TESTFILE)
 	$(LZ4) -vt $(TESTFILE).lz4
 .PHONY: cxxtest
 cxxtest: CFLAGS := -O3 -Wall -Wextra -Wundef -Wshadow -Wcast-align -Werror
 cxxtest: clean
 	CC=$(CXX) $(MAKE) -C . all CFLAGS="$(CFLAGS)"
 clean:
 	@rm -f core *.o *.dec *-0 *-9 *-8192 *.lz4s *.lz4 \
 	 printVersion$(EXT) doubleBuffer$(EXT) dictionaryRandomAccess$(EXT) \
 	 ringBuffer$(EXT) ringBufferHC$(EXT) lineCompress$(EXT) frameCompress$(EXT) \
 	 fileCompress$(EXT) compressFunctions$(EXT) simpleBuffer$(EXT)
 	@echo Cleaning completed
--- a/examples/README.md
+++ b/examples/README.md
@ -0,0 +1,11 @@
 # LZ4 examples
 All examples are GPL-v2 licensed.
 ## Documents
 - [Streaming API Basics](streaming_api_basics.md)
 - Examples
     - [Double Buffer](blockStreaming_doubleBuffer.md)
     - [Line by Line Text Compression](blockStreaming_lineByLine.md)
     - [Dictionary Random Access](dictionaryRandomAccess.md)
--- a/examples/blockStreaming_doubleBuffer.c
+++ b/examples/blockStreaming_doubleBuffer.c
@ -0,0 +1,202 @@
 // LZ4 streaming API example : double buffer
 // Copyright : Takayuki Matsuoka
 #if defined(_MSC_VER) && (_MSC_VER <= 1800)  /* Visual Studio <= 2013 */
 #  define _CRT_SECURE_NO_WARNINGS
 #  define snprintf sprintf_s
 #endif
 #include "lz4.h"
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 enum {
    BLOCK_BYTES = 1024 * 8,
 //  BLOCK_BYTES = 1024 * 64,
 };
 size_t write_int(FILE* fp, int i) {
    return fwrite(&i, sizeof(i), 1, fp);
 }
 size_t write_bin(FILE* fp, const void* array, size_t arrayBytes) {
    return fwrite(array, 1, arrayBytes, fp);
 }
 size_t read_int(FILE* fp, int* i) {
    return fread(i, sizeof(*i), 1, fp);
 }
 size_t read_bin(FILE* fp, void* array, size_t arrayBytes) {
    return fread(array, 1, arrayBytes, fp);
 }
 void test_compress(FILE* outFp, FILE* inpFp)
 {
    LZ4_stream_t lz4Stream_body;
    LZ4_stream_t* lz4Stream = &lz4Stream_body;
    char inpBuf[2][BLOCK_BYTES];
    int  inpBufIndex = 0;
    LZ4_initStream(lz4Stream, sizeof (*lz4Stream));
    for(;;) {
        char* const inpPtr = inpBuf[inpBufIndex];
        const int inpBytes = (int) read_bin(inpFp, inpPtr, BLOCK_BYTES);
        if(0 == inpBytes) {
            break;
        }
        {
            char cmpBuf[LZ4_COMPRESSBOUND(BLOCK_BYTES)];
            const int cmpBytes = LZ4_compress_fast_continue(
                lz4Stream, inpPtr, cmpBuf, inpBytes, sizeof(cmpBuf), 1);
            if(cmpBytes <= 0) {
                break;
            }
            write_int(outFp, cmpBytes);
            write_bin(outFp, cmpBuf, (size_t) cmpBytes);
        }
        inpBufIndex = (inpBufIndex + 1) % 2;
    }
    write_int(outFp, 0);
 }
 void test_decompress(FILE* outFp, FILE* inpFp)
 {
    LZ4_streamDecode_t lz4StreamDecode_body;
    LZ4_streamDecode_t* lz4StreamDecode = &lz4StreamDecode_body;
    char decBuf[2][BLOCK_BYTES];
    int  decBufIndex = 0;
    LZ4_setStreamDecode(lz4StreamDecode, NULL, 0);
    for(;;) {
        char cmpBuf[LZ4_COMPRESSBOUND(BLOCK_BYTES)];
        int  cmpBytes = 0;
        {
            const size_t readCount0 = read_int(inpFp, &cmpBytes);
            if(readCount0 != 1 || cmpBytes <= 0) {
                break;
            }
            const size_t readCount1 = read_bin(inpFp, cmpBuf, (size_t) cmpBytes);
            if(readCount1 != (size_t) cmpBytes) {
                break;
            }
        }
        {
            char* const decPtr = decBuf[decBufIndex];
            const int decBytes = LZ4_decompress_safe_continue(
                lz4StreamDecode, cmpBuf, decPtr, cmpBytes, BLOCK_BYTES);
            if(decBytes <= 0) {
                break;
            }
            write_bin(outFp, decPtr, (size_t) decBytes);
        }
        decBufIndex = (decBufIndex + 1) % 2;
    }
 }
 int compare(FILE* fp0, FILE* fp1)
 {
    int result = 0;
    while(0 == result) {
        char b0[65536];
        char b1[65536];
        const size_t r0 = read_bin(fp0, b0, sizeof(b0));
        const size_t r1 = read_bin(fp1, b1, sizeof(b1));
        result = (int) r0 - (int) r1;
        if(0 == r0 || 0 == r1) {
            break;
        }
        if(0 == result) {
            result = memcmp(b0, b1, r0);
        }
    }
    return result;
 }
 int main(int argc, char* argv[])
 {
    char inpFilename[256] = { 0 };
    char lz4Filename[256] = { 0 };
    char decFilename[256] = { 0 };
    if(argc < 2) {
        printf("Please specify input filename\n");
        return 0;
    }
    snprintf(inpFilename, 256, "%s", argv[1]);
    snprintf(lz4Filename, 256, "%s.lz4s-%d", argv[1], BLOCK_BYTES);
    snprintf(decFilename, 256, "%s.lz4s-%d.dec", argv[1], BLOCK_BYTES);
    printf("inp = [%s]\n", inpFilename);
    printf("lz4 = [%s]\n", lz4Filename);
    printf("dec = [%s]\n", decFilename);
    // compress
    {
        FILE* inpFp = fopen(inpFilename, "rb");
        FILE* outFp = fopen(lz4Filename, "wb");
        printf("compress : %s -> %s\n", inpFilename, lz4Filename);
        test_compress(outFp, inpFp);
        printf("compress : done\n");
        fclose(outFp);
        fclose(inpFp);
    }
    // decompress
    {
        FILE* inpFp = fopen(lz4Filename, "rb");
        FILE* outFp = fopen(decFilename, "wb");
        printf("decompress : %s -> %s\n", lz4Filename, decFilename);
        test_decompress(outFp, inpFp);
        printf("decompress : done\n");
        fclose(outFp);
        fclose(inpFp);
    }
    // verify
    {
        FILE* inpFp = fopen(inpFilename, "rb");
        FILE* decFp = fopen(decFilename, "rb");
        printf("verify : %s <-> %s\n", inpFilename, decFilename);
        const int cmp = compare(inpFp, decFp);
        if(0 == cmp) {
            printf("verify : OK\n");
        } else {
            printf("verify : NG\n");
        }
        fclose(decFp);
        fclose(inpFp);
    }
    return 0;
 }
--- a/examples/blockStreaming_doubleBuffer.md
+++ b/examples/blockStreaming_doubleBuffer.md
@ -0,0 +1,100 @@
 # LZ4 Streaming API Example : Double Buffer
 by *Takayuki Matsuoka*
 `blockStreaming_doubleBuffer.c` is LZ4 Streaming API example which implements double buffer (de)compression.
 Please note :
 - Firstly, read "LZ4 Streaming API Basics".
 - This is relatively advanced application example.
 - Output file is not compatible with lz4frame and platform dependent.
 ## What's the point of this example ?
 - Handle huge file in small amount of memory
 - Always better compression ratio than Block API
 - Uniform block size
 ## How the compression works
 First of all, allocate "Double Buffer" for input and LZ4 compressed data buffer for output.
 Double buffer has two pages, "first" page (Page#1) and "second" page (Page#2).
 ```
        Double Buffer
      Page#1    Page#2
    +---------+---------+
    | Block#1 |         |
    +----+----+---------+
         |
         v
      {Out#1}
      Prefix Dependency
         +---------+
         |         |
         v         |
    +---------+----+----+
    | Block#1 | Block#2 |
    +---------+----+----+
                   |
                   v
                {Out#2}
   External Dictionary Mode
         +---------+
         |         |
         |         v
    +----+----+---------+
    | Block#3 | Block#2 |
    +----+----+---------+
         |
         v
      {Out#3}
      Prefix Dependency
         +---------+
         |         |
         v         |
    +---------+----+----+
    | Block#3 | Block#4 |
    +---------+----+----+
                   |
                   v
                {Out#4}
 ```
 Next, read first block to double buffer's first page. And compress it by `LZ4_compress_continue()`.
 For the first time, LZ4 doesn't know any previous dependencies,
 so it just compress the line without dependencies and generates compressed block {Out#1} to LZ4 compressed data buffer.
 After that, write {Out#1} to the file.
 Next, read second block to double buffer's second page. And compress it.
 This time, LZ4 can use dependency to Block#1 to improve compression ratio.
 This dependency is called "Prefix mode".
 Next, read third block to double buffer's *first* page, and compress it.
 Also this time, LZ4 can use dependency to Block#2.
 This dependency is called "External Dictonaly mode".
 Continue these procedure to the end of the file.
 ## How the decompression works
 Decompression will do reverse order.
 - Read first compressed block.
 - Decompress it to the first page and write that page to the file.
 - Read second compressed block.
 - Decompress it to the second page and write that page to the file.
 - Read third compressed block.
 - Decompress it to the *first* page and write that page to the file.
 Continue these procedure to the end of the compressed file.
--- a/examples/blockStreaming_lineByLine.c
+++ b/examples/blockStreaming_lineByLine.c
@ -0,0 +1,211 @@
 // LZ4 streaming API example : line-by-line logfile compression
 // by Takayuki Matsuoka
 #if defined(_MSC_VER) && (_MSC_VER <= 1800)  /* Visual Studio <= 2013 */
 #  define _CRT_SECURE_NO_WARNINGS
 #  define snprintf sprintf_s
 #endif
 #include "lz4.h"
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 static size_t write_uint16(FILE* fp, uint16_t i)
 {
    return fwrite(&i, sizeof(i), 1, fp);
 }
 static size_t write_bin(FILE* fp, const void* array, int arrayBytes)
 {
    return fwrite(array, 1, arrayBytes, fp);
 }
 static size_t read_uint16(FILE* fp, uint16_t* i)
 {
    return fread(i, sizeof(*i), 1, fp);
 }
 static size_t read_bin(FILE* fp, void* array, int arrayBytes)
 {
    return fread(array, 1, arrayBytes, fp);
 }
 static void test_compress(
    FILE* outFp,
    FILE* inpFp,
    size_t messageMaxBytes,
    size_t ringBufferBytes)
 {
    LZ4_stream_t* const lz4Stream = LZ4_createStream();
    const size_t cmpBufBytes = LZ4_COMPRESSBOUND(messageMaxBytes);
    char* const cmpBuf = (char*) malloc(cmpBufBytes);
    char* const inpBuf = (char*) malloc(ringBufferBytes);
    int inpOffset = 0;
    for ( ; ; )
    {
        char* const inpPtr = &inpBuf[inpOffset];
 #if 0
        // Read random length data to the ring buffer.
        const int randomLength = (rand() % messageMaxBytes) + 1;
        const int inpBytes = (int) read_bin(inpFp, inpPtr, randomLength);
        if (0 == inpBytes) break;
 #else
        // Read line to the ring buffer.
        int inpBytes = 0;
        if (!fgets(inpPtr, (int) messageMaxBytes, inpFp))
            break;
        inpBytes = (int) strlen(inpPtr);
 #endif
        {
            const int cmpBytes = LZ4_compress_fast_continue(
                lz4Stream, inpPtr, cmpBuf, inpBytes, (int) cmpBufBytes, 1);
            if (cmpBytes <= 0) break;
            write_uint16(outFp, (uint16_t) cmpBytes);
            write_bin(outFp, cmpBuf, cmpBytes);
            // Add and wraparound the ringbuffer offset
            inpOffset += inpBytes;
            if ((size_t)inpOffset >= ringBufferBytes - messageMaxBytes) inpOffset = 0;
        }
    }
    write_uint16(outFp, 0);
    free(inpBuf);
    free(cmpBuf);
    LZ4_freeStream(lz4Stream);
 }
 static void test_decompress(
    FILE* outFp,
    FILE* inpFp,
    size_t messageMaxBytes,
    size_t ringBufferBytes)
 {
    LZ4_streamDecode_t* const lz4StreamDecode = LZ4_createStreamDecode();
    char* const cmpBuf = (char*) malloc(LZ4_COMPRESSBOUND(messageMaxBytes));
    char* const decBuf = (char*) malloc(ringBufferBytes);
    int decOffset = 0;
    for ( ; ; )
    {
        uint16_t cmpBytes = 0;
        if (read_uint16(inpFp, &cmpBytes) != 1) break;
        if (cmpBytes == 0) break;
        if (read_bin(inpFp, cmpBuf, cmpBytes) != cmpBytes) break;
        {
            char* const decPtr = &decBuf[decOffset];
            const int decBytes = LZ4_decompress_safe_continue(
                lz4StreamDecode, cmpBuf, decPtr, cmpBytes, (int) messageMaxBytes);
            if (decBytes <= 0) break;
            write_bin(outFp, decPtr, decBytes);
            // Add and wraparound the ringbuffer offset
            decOffset += decBytes;
            if ((size_t)decOffset >= ringBufferBytes - messageMaxBytes) decOffset = 0;
        }
    }
    free(decBuf);
    free(cmpBuf);
    LZ4_freeStreamDecode(lz4StreamDecode);
 }
 static int compare(FILE* f0, FILE* f1)
 {
    int result = 0;
    const size_t tempBufferBytes = 65536;
    char* const b0 = (char*) malloc(tempBufferBytes);
    char* const b1 = (char*) malloc(tempBufferBytes);
    while(0 == result)
    {
        const size_t r0 = fread(b0, 1, tempBufferBytes, f0);
        const size_t r1 = fread(b1, 1, tempBufferBytes, f1);
        result = (int) r0 - (int) r1;
        if (0 == r0 || 0 == r1) break;
        if (0 == result) result = memcmp(b0, b1, r0);
    }
    free(b1);
    free(b0);
    return result;
 }
 int main(int argc, char* argv[])
 {
    enum {
        MESSAGE_MAX_BYTES   = 1024,
        RING_BUFFER_BYTES   = 1024 * 256 + MESSAGE_MAX_BYTES,
    };
    char inpFilename[256] = { 0 };
    char lz4Filename[256] = { 0 };
    char decFilename[256] = { 0 };
    if (argc < 2)
    {
        printf("Please specify input filename\n");
        return 0;
    }
    snprintf(inpFilename, 256, "%s", argv[1]);
    snprintf(lz4Filename, 256, "%s.lz4s", argv[1]);
    snprintf(decFilename, 256, "%s.lz4s.dec", argv[1]);
    printf("inp = [%s]\n", inpFilename);
    printf("lz4 = [%s]\n", lz4Filename);
    printf("dec = [%s]\n", decFilename);
    // compress
    {
        FILE* inpFp = fopen(inpFilename, "rb");
        FILE* outFp = fopen(lz4Filename, "wb");
        test_compress(outFp, inpFp, MESSAGE_MAX_BYTES, RING_BUFFER_BYTES);
        fclose(outFp);
        fclose(inpFp);
    }
    // decompress
    {
        FILE* inpFp = fopen(lz4Filename, "rb");
        FILE* outFp = fopen(decFilename, "wb");
        test_decompress(outFp, inpFp, MESSAGE_MAX_BYTES, RING_BUFFER_BYTES);
        fclose(outFp);
        fclose(inpFp);
    }
    // verify
    {
        FILE* inpFp = fopen(inpFilename, "rb");
        FILE* decFp = fopen(decFilename, "rb");
        const int cmp = compare(inpFp, decFp);
        if (0 == cmp)
            printf("Verify : OK\n");
        else
            printf("Verify : NG\n");
        fclose(decFp);
        fclose(inpFp);
    }
    return 0;
 }
--- a/examples/blockStreaming_lineByLine.md
+++ b/examples/blockStreaming_lineByLine.md
@ -0,0 +1,122 @@
 # LZ4 Streaming API Example : Line by Line Text Compression
 by *Takayuki Matsuoka*
 `blockStreaming_lineByLine.c` is LZ4 Streaming API example which implements line by line incremental (de)compression.
 Please note the following restrictions :
 - Firstly, read "LZ4 Streaming API Basics".
 - This is relatively advanced application example.
 - Output file is not compatible with lz4frame and platform dependent.
 ## What's the point of this example ?
 - Line by line incremental (de)compression.
 - Handle huge file in small amount of memory
 - Generally better compression ratio than Block API
 - Non-uniform block size
 ## How the compression works
 First of all, allocate "Ring Buffer" for input and LZ4 compressed data buffer for output.
 ```
 (1)
    Ring Buffer
    +--------+
    | Line#1 |
    +---+----+
        |
        v
     {Out#1}
 (2)
    Prefix Mode Dependency
          +----+
          |    |
          v    |
    +--------+-+------+
    | Line#1 | Line#2 |
    +--------+---+----+
                 |
                 v
              {Out#2}
 (3)
          Prefix   Prefix
          +----+   +----+
          |    |   |    |
          v    |   v    |
    +--------+-+------+-+------+
    | Line#1 | Line#2 | Line#3 |
    +--------+--------+---+----+
                          |
                          v
                       {Out#3}
 (4)
                        External Dictionary Mode
                +----+   +----+
                |    |   |    |
                v    |   v    |
    ------+--------+-+------+-+--------+
          |  ....  | Line#X | Line#X+1 |
    ------+--------+--------+-----+----+
                            ^     |
                            |     v
                            |  {Out#X+1}
                            |
                          Reset
 (5)
                                    Prefix
                                    +-----+
                                    |     |
                                    v     |
    ------+--------+--------+----------+--+-------+
          |  ....  | Line#X | Line#X+1 | Line#X+2 |
    ------+--------+--------+----------+-----+----+
                            ^                |
                            |                v
                            |            {Out#X+2}
                            |
                          Reset
 ```
 Next (see (1)), read first line to ringbuffer and compress it by `LZ4_compress_continue()`.
 For the first time, LZ4 doesn't know any previous dependencies,
 so it just compress the line without dependencies and generates compressed line {Out#1} to LZ4 compressed data buffer.
 After that, write {Out#1} to the file and forward ringbuffer offset.
 Do the same things to second line (see (2)).
 But in this time, LZ4 can use dependency to Line#1 to improve compression ratio.
 This dependency is called "Prefix mode".
 Eventually, we'll reach end of ringbuffer at Line#X (see (4)).
 This time, we should reset ringbuffer offset.
 After resetting, at Line#X+1 pointer is not adjacent, but LZ4 still maintain its memory.
 This is called "External Dictionary Mode".
 In Line#X+2 (see (5)), finally LZ4 forget almost all memories but still remains Line#X+1.
 This is the same situation as Line#2.
 Continue these procedures to the end of text file.
 ## How the decompression works
 Decompression will do reverse order.
 - Read compressed line from the file to buffer.
 - Decompress it to the ringbuffer.
 - Output decompressed plain text line to the file.
 - Forward ringbuffer offset. If offset exceeds end of the ringbuffer, reset it.
 Continue these procedures to the end of the compressed file.
--- a/examples/blockStreaming_ringBuffer.c
+++ b/examples/blockStreaming_ringBuffer.c
@ -0,0 +1,190 @@
 /* LZ4 streaming API example : ring buffer
 * Based on sample code from Takayuki Matsuoka */
 /**************************************
 * Compiler Options
 **************************************/
 #if defined(_MSC_VER) && (_MSC_VER <= 1800)  /* Visual Studio <= 2013 */
 #  define _CRT_SECURE_NO_WARNINGS
 #  define snprintf sprintf_s
 #endif
 /**************************************
 * Includes
 **************************************/
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #include "lz4.h"
 enum {
    MESSAGE_MAX_BYTES   = 1024,
    RING_BUFFER_BYTES   = 1024 * 8 + MESSAGE_MAX_BYTES,
    DECODE_RING_BUFFER  = RING_BUFFER_BYTES + MESSAGE_MAX_BYTES   /* Intentionally larger, to test unsynchronized ring buffers */
 };
 size_t write_int32(FILE* fp, int32_t i) {
    return fwrite(&i, sizeof(i), 1, fp);
 }
 size_t write_bin(FILE* fp, const void* array, int arrayBytes) {
    return fwrite(array, 1, arrayBytes, fp);
 }
 size_t read_int32(FILE* fp, int32_t* i) {
    return fread(i, sizeof(*i), 1, fp);
 }
 size_t read_bin(FILE* fp, void* array, int arrayBytes) {
    return fread(array, 1, arrayBytes, fp);
 }
 void test_compress(FILE* outFp, FILE* inpFp)
 {
    LZ4_stream_t lz4Stream_body = { { 0 } };
    LZ4_stream_t* lz4Stream = &lz4Stream_body;
    static char inpBuf[RING_BUFFER_BYTES];
    int inpOffset = 0;
    for(;;) {
        // Read random length ([1,MESSAGE_MAX_BYTES]) data to the ring buffer.
        char* const inpPtr = &inpBuf[inpOffset];
        const int randomLength = (rand() % MESSAGE_MAX_BYTES) + 1;
        const int inpBytes = (int) read_bin(inpFp, inpPtr, randomLength);
        if (0 == inpBytes) break;
        {
 #define CMPBUFSIZE (LZ4_COMPRESSBOUND(MESSAGE_MAX_BYTES))
            char cmpBuf[CMPBUFSIZE];
            const int cmpBytes = LZ4_compress_fast_continue(lz4Stream, inpPtr, cmpBuf, inpBytes, CMPBUFSIZE, 0);
            if(cmpBytes <= 0) break;
            write_int32(outFp, cmpBytes);
            write_bin(outFp, cmpBuf, cmpBytes);
            inpOffset += inpBytes;
            // Wraparound the ringbuffer offset
            if(inpOffset >= RING_BUFFER_BYTES - MESSAGE_MAX_BYTES) inpOffset = 0;
        }
    }
    write_int32(outFp, 0);
 }
 void test_decompress(FILE* outFp, FILE* inpFp)
 {
    static char decBuf[DECODE_RING_BUFFER];
    int decOffset = 0;
    LZ4_streamDecode_t lz4StreamDecode_body = { { 0 } };
    LZ4_streamDecode_t* lz4StreamDecode = &lz4StreamDecode_body;
    for(;;) {
        int cmpBytes = 0;
        char cmpBuf[CMPBUFSIZE];
        {   const size_t r0 = read_int32(inpFp, &cmpBytes);
            if(r0 != 1 || cmpBytes <= 0) break;
            const size_t r1 = read_bin(inpFp, cmpBuf, cmpBytes);
            if(r1 != (size_t) cmpBytes) break;
        }
        {   char* const decPtr = &decBuf[decOffset];
            const int decBytes = LZ4_decompress_safe_continue(
                lz4StreamDecode, cmpBuf, decPtr, cmpBytes, MESSAGE_MAX_BYTES);
            if(decBytes <= 0) break;
            decOffset += decBytes;
            write_bin(outFp, decPtr, decBytes);
            // Wraparound the ringbuffer offset
            if(decOffset >= DECODE_RING_BUFFER - MESSAGE_MAX_BYTES) decOffset = 0;
        }
    }
 }
 int compare(FILE* f0, FILE* f1)
 {
    int result = 0;
    while (0 == result) {
        char b0[65536];
        char b1[65536];
        const size_t r0 = fread(b0, 1, sizeof(b0), f0);
        const size_t r1 = fread(b1, 1, sizeof(b1), f1);
        result = (int) r0 - (int) r1;
        if (0 == r0 || 0 == r1) break;
        if (0 == result) result = memcmp(b0, b1, r0);
    }
    return result;
 }
 int main(int argc, char** argv)
 {
    char inpFilename[256] = { 0 };
    char lz4Filename[256] = { 0 };
    char decFilename[256] = { 0 };
    if (argc < 2) {
        printf("Please specify input filename\n");
        return 0;
    }
    snprintf(inpFilename, 256, "%s", argv[1]);
    snprintf(lz4Filename, 256, "%s.lz4s-%d", argv[1], 0);
    snprintf(decFilename, 256, "%s.lz4s-%d.dec", argv[1], 0);
    printf("inp = [%s]\n", inpFilename);
    printf("lz4 = [%s]\n", lz4Filename);
    printf("dec = [%s]\n", decFilename);
    // compress
    {   FILE* const inpFp = fopen(inpFilename, "rb");
        FILE* const outFp = fopen(lz4Filename, "wb");
        test_compress(outFp, inpFp);
        fclose(outFp);
        fclose(inpFp);
    }
    // decompress
    {   FILE* const inpFp = fopen(lz4Filename, "rb");
        FILE* const outFp = fopen(decFilename, "wb");
        test_decompress(outFp, inpFp);
        fclose(outFp);
        fclose(inpFp);
    }
    // verify
    {   FILE* const inpFp = fopen(inpFilename, "rb");
        FILE* const decFp = fopen(decFilename, "rb");
        const int cmp = compare(inpFp, decFp);
        if (0 == cmp) {
            printf("Verify : OK\n");
        } else {
            printf("Verify : NG\n");
        }
        fclose(decFp);
        fclose(inpFp);
    }
    return 0;
 }
--- a/examples/compress_functions.c
+++ b/examples/compress_functions.c
@ -0,0 +1,363 @@
 /*
 * compress_functions.c
 * Copyright  : Kyle Harper
 * License    : Follows same licensing as the lz4.c/lz4.h program at any given time.  Currently, BSD 2.
 * Description: A program to demonstrate the various compression functions involved in when using LZ4_compress_default().  The idea
 *              is to show how each step in the call stack can be used directly, if desired.  There is also some benchmarking for
 *              each function to demonstrate the (probably lack of) performance difference when jumping the stack.
 *              (If you're new to lz4, please read simple_buffer.c to understand the fundamentals)
 *
 *              The call stack (before theoretical compiler optimizations) for LZ4_compress_default is as follows:
 *                LZ4_compress_default
 *                  LZ4_compress_fast
 *                    LZ4_compress_fast_extState
 *                      LZ4_compress_generic
 *
 *              LZ4_compress_default()
 *                This is the recommended function for compressing data.  It will serve as the baseline for comparison.
 *              LZ4_compress_fast()
 *                Despite its name, it's not a "fast" version of compression.  It simply decides if HEAPMODE is set and either
 *                allocates memory on the heap for a struct or creates the struct directly on the stack.  Stack access is generally
 *                faster but this function itself isn't giving that advantage, it's just some logic for compile time.
 *              LZ4_compress_fast_extState()
 *                This simply accepts all the pointers and values collected thus far and adds logic to determine how
 *                LZ4_compress_generic should be invoked; specifically: can the source fit into a single pass as determined by
 *                LZ4_64Klimit.
 *              LZ4_compress_generic()
 *                As the name suggests, this is the generic function that ultimately does most of the heavy lifting.  Calling this
 *                directly can help avoid some test cases and branching which might be useful in some implementation-specific
 *                situations, but you really need to know what you're doing AND what you're asking lz4 to do!  You also need a
 *                wrapper function because this function isn't exposed with lz4.h.
 *
 *              The call stack for decompression functions is shallow.  There are 2 options:
 *                LZ4_decompress_safe  ||  LZ4_decompress_fast
 *                  LZ4_decompress_generic
 *
 *               LZ4_decompress_safe
 *                 This is the recommended function for decompressing data.  It is considered safe because the caller specifies
 *                 both the size of the compressed buffer to read as well as the maximum size of the output (decompressed) buffer
 *                 instead of just the latter.
 *               LZ4_decompress_fast
 *                 Again, despite its name it's not a "fast" version of decompression.  It simply frees the caller of sending the
 *                 size of the compressed buffer (it will simply be read-to-end, hence it's non-safety).
 *               LZ4_decompress_generic
 *                 This is the generic function that both of the LZ4_decompress_* functions above end up calling.  Calling this
 *                 directly is not advised, period.  Furthermore, it is a static inline function in lz4.c, so there isn't a symbol
 *                 exposed for anyone using lz4.h to utilize.
 *
 *               Special Note About Decompression:
 *               Using the LZ4_decompress_safe() function protects against malicious (user) input.  If you are using data from a
 *               trusted source, or if your program is the producer (P) as well as its consumer (C) in a PC or MPMC setup, you can
 *               safely use the LZ4_decompress_fast function.
 */
 /* Since lz4 compiles with c99 and not gnu/std99 we need to enable POSIX linking for time.h structs and functions. */
 #if __STDC_VERSION__ >= 199901L
 #define _XOPEN_SOURCE 600
 #else
 #define _XOPEN_SOURCE 500
 #endif
 #define _POSIX_C_SOURCE 199309L
 /* Includes, for Power! */
 #define LZ4_DISABLE_DEPRECATE_WARNINGS   /* LZ4_decompress_fast */
 #include "lz4.h"
 #include <stdio.h>    /* for printf() */
 #include <stdlib.h>   /* for exit() */
 #include <string.h>   /* for atoi() memcmp() */
 #include <stdint.h>   /* for uint_types */
 #include <inttypes.h> /* for PRIu64 */
 #include <time.h>     /* for clock_gettime() */
 #include <locale.h>   /* for setlocale() */
 /* We need to know what one billion is for clock timing. */
 #define BILLION 1000000000L
 /* Create a crude set of test IDs so we can switch on them later  (Can't switch() on a char[] or char*). */
 #define ID__LZ4_COMPRESS_DEFAULT        1
 #define ID__LZ4_COMPRESS_FAST           2
 #define ID__LZ4_COMPRESS_FAST_EXTSTATE  3
 #define ID__LZ4_COMPRESS_GENERIC        4
 #define ID__LZ4_DECOMPRESS_SAFE         5
 #define ID__LZ4_DECOMPRESS_FAST         6
 /*
 * Easy show-error-and-bail function.
 */
 void run_screaming(const char *message, const int code) {
  printf("%s\n", message);
  exit(code);
 }
 /*
 * Centralize the usage function to keep main cleaner.
 */
 void usage(const char *message) {
  printf("Usage: ./argPerformanceTesting <iterations>\n");
  run_screaming(message, 1);
  return;
 }
 /*
 * Runs the benchmark for LZ4_compress_* based on function_id.
 */
 uint64_t bench(
    const char *known_good_dst,
    const int function_id,
    const int iterations,
    const char *src,
    char *dst,
    const size_t src_size,
    const size_t max_dst_size,
    const size_t comp_size
  ) {
  uint64_t time_taken = 0;
  int rv = 0;
  const int warm_up = 5000;
  struct timespec start, end;
  const int acceleration = 1;
  LZ4_stream_t state;
  // Select the right function to perform the benchmark on.  We perform 5000 initial loops to warm the cache and ensure that dst
  // remains matching to known_good_dst between successive calls.
  switch(function_id) {
    case ID__LZ4_COMPRESS_DEFAULT:
      printf("Starting benchmark for function: LZ4_compress_default()\n");
      for(int junk=0; junk<warm_up; junk++)
        rv = LZ4_compress_default(src, dst, src_size, max_dst_size);
      if (rv < 1)
        run_screaming("Couldn't run LZ4_compress_default()... error code received is in exit code.", rv);
      if (memcmp(known_good_dst, dst, max_dst_size) != 0)
        run_screaming("According to memcmp(), the compressed dst we got doesn't match the known_good_dst... ruh roh.", 1);
      clock_gettime(CLOCK_MONOTONIC, &start);
      for (int i=1; i<=iterations; i++)
        LZ4_compress_default(src, dst, src_size, max_dst_size);
      break;
    case ID__LZ4_COMPRESS_FAST:
      printf("Starting benchmark for function: LZ4_compress_fast()\n");
      for(int junk=0; junk<warm_up; junk++)
        rv = LZ4_compress_fast(src, dst, src_size, max_dst_size, acceleration);
      if (rv < 1)
        run_screaming("Couldn't run LZ4_compress_fast()... error code received is in exit code.", rv);
      if (memcmp(known_good_dst, dst, max_dst_size) != 0)
        run_screaming("According to memcmp(), the compressed dst we got doesn't match the known_good_dst... ruh roh.", 1);
      clock_gettime(CLOCK_MONOTONIC, &start);
      for (int i=1; i<=iterations; i++)
        LZ4_compress_fast(src, dst, src_size, max_dst_size, acceleration);
      break;
    case ID__LZ4_COMPRESS_FAST_EXTSTATE:
      printf("Starting benchmark for function: LZ4_compress_fast_extState()\n");
      for(int junk=0; junk<warm_up; junk++)
        rv = LZ4_compress_fast_extState(&state, src, dst, src_size, max_dst_size, acceleration);
      if (rv < 1)
        run_screaming("Couldn't run LZ4_compress_fast_extState()... error code received is in exit code.", rv);
      if (memcmp(known_good_dst, dst, max_dst_size) != 0)
        run_screaming("According to memcmp(), the compressed dst we got doesn't match the known_good_dst... ruh roh.", 1);
      clock_gettime(CLOCK_MONOTONIC, &start);
      for (int i=1; i<=iterations; i++)
        LZ4_compress_fast_extState(&state, src, dst, src_size, max_dst_size, acceleration);
      break;
 //    Disabled until LZ4_compress_generic() is exposed in the header.
 //    case ID__LZ4_COMPRESS_GENERIC:
 //      printf("Starting benchmark for function: LZ4_compress_generic()\n");
 //      LZ4_resetStream((LZ4_stream_t*)&state);
 //      for(int junk=0; junk<warm_up; junk++) {
 //        LZ4_resetStream((LZ4_stream_t*)&state);
 //        //rv = LZ4_compress_generic_wrapper(&state, src, dst, src_size, max_dst_size, notLimited, byU16, noDict, noDictIssue, acceleration);
 //        LZ4_compress_generic_wrapper(&state, src, dst, src_size, max_dst_size, acceleration);
 //      }
 //      if (rv < 1)
 //        run_screaming("Couldn't run LZ4_compress_generic()... error code received is in exit code.", rv);
 //      if (memcmp(known_good_dst, dst, max_dst_size) != 0)
 //        run_screaming("According to memcmp(), the compressed dst we got doesn't match the known_good_dst... ruh roh.", 1);
 //      for (int i=1; i<=iterations; i++) {
 //        LZ4_resetStream((LZ4_stream_t*)&state);
 //        //LZ4_compress_generic_wrapper(&state, src, dst, src_size, max_dst_size, notLimited, byU16, noDict, noDictIssue, acceleration);
 //        LZ4_compress_generic_wrapper(&state, src, dst, src_size, max_dst_size, acceleration);
 //      }
 //      break;
    case ID__LZ4_DECOMPRESS_SAFE:
      printf("Starting benchmark for function: LZ4_decompress_safe()\n");
      for(int junk=0; junk<warm_up; junk++)
        rv = LZ4_decompress_safe(src, dst, comp_size, src_size);
      if (rv < 1)
        run_screaming("Couldn't run LZ4_decompress_safe()... error code received is in exit code.", rv);
      if (memcmp(known_good_dst, dst, src_size) != 0)
        run_screaming("According to memcmp(), the compressed dst we got doesn't match the known_good_dst... ruh roh.", 1);
      clock_gettime(CLOCK_MONOTONIC, &start);
      for (int i=1; i<=iterations; i++)
        LZ4_decompress_safe(src, dst, comp_size, src_size);
      break;
    case ID__LZ4_DECOMPRESS_FAST:
      printf("Starting benchmark for function: LZ4_decompress_fast()\n");
      for(int junk=0; junk<warm_up; junk++)
        rv = LZ4_decompress_fast(src, dst, src_size);
      if (rv < 1)
        run_screaming("Couldn't run LZ4_decompress_fast()... error code received is in exit code.", rv);
      if (memcmp(known_good_dst, dst, src_size) != 0)
        run_screaming("According to memcmp(), the compressed dst we got doesn't match the known_good_dst... ruh roh.", 1);
      clock_gettime(CLOCK_MONOTONIC, &start);
      for (int i=1; i<=iterations; i++)
        LZ4_decompress_fast(src, dst, src_size);
      break;
    default:
      run_screaming("The test specified isn't valid.  Please check your code.", 1);
      break;
  }
  // Stop timer and return time taken.
  clock_gettime(CLOCK_MONOTONIC, &end);
  time_taken = BILLION *(end.tv_sec - start.tv_sec) + end.tv_nsec - start.tv_nsec;
  return time_taken;
 }
 /*
 * main()
 * We will demonstrate the use of each function for simplicity sake.  Then we will run 2 suites of benchmarking:
 * Test suite A)  Uses generic Lorem Ipsum text which should be generally compressible insomuch as basic human text is
 *                compressible for such a small src_size
 * Test Suite B)  For the sake of testing, see what results we get if the data is drastically easier to compress.  IF there are
 *                indeed losses and IF more compressible data is faster to process, this will exacerbate the findings.
 */
 int main(int argc, char **argv) {
  // Get and verify options.  There's really only 1:  How many iterations to run.
  int iterations = 1000000;
  if (argc > 1)
    iterations = atoi(argv[1]);
  if (iterations < 1)
    usage("Argument 1 (iterations) must be > 0.");
  // First we will create 2 sources (char *) of 2000 bytes each.  One normal text, the other highly-compressible text.
  const char *src    = "Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed luctus purus et risus vulputate, et mollis orci ullamcorper. Nulla facilisi. Fusce in ligula sed purus varius aliquet interdum vitae justo. Proin quis diam velit. Nulla varius iaculis auctor. Cras volutpat, justo eu dictum pulvinar, elit sem porttitor metus, et imperdiet metus sapien et ante. Nullam nisi nulla, ornare eu tristique eu, dignissim vitae diam. Nulla sagittis porta libero, a accumsan felis sagittis scelerisque.  Integer laoreet eleifend congue. Etiam rhoncus leo vel dolor fermentum, quis luctus nisl iaculis. Praesent a erat sapien. Aliquam semper mi in lorem ultrices ultricies. Lorem ipsum dolor sit amet, consectetur adipiscing elit. In feugiat risus sed enim ultrices, at sodales nulla tristique. Maecenas eget pellentesque justo, sed pellentesque lectus. Fusce sagittis sit amet elit vel varius. Donec sed ligula nec ligula vulputate rutrum sed ut lectus. Etiam congue pharetra leo vitae cursus. Morbi enim ante, porttitor ut varius vel, tincidunt quis justo. Nunc iaculis, risus id ultrices semper, metus est efficitur ligula, vel posuere risus nunc eget purus. Ut lorem turpis, condimentum at sem sed, porta aliquam turpis. In ut sapien a nulla dictum tincidunt quis sit amet lorem. Fusce at est egestas, luctus neque eu, consectetur tortor. Phasellus eleifend ultricies nulla ac lobortis.  Morbi maximus quam cursus vehicula iaculis. Maecenas cursus vel justo ut rutrum. Curabitur magna orci, dignissim eget dapibus vitae, finibus id lacus. Praesent rhoncus mattis augue vitae bibendum. Praesent porta mauris non ultrices fermentum. Quisque vulputate ipsum in sodales pulvinar. Aliquam nec mollis felis. Donec vitae augue pulvinar, congue nisl sed, pretium purus. Fusce lobortis mi ac neque scelerisque semper. Pellentesque vel est vitae magna aliquet aliquet. Nam non dolor. Nulla facilisi. Class aptent taciti sociosqu ad litora torquent per conubia nostra, per inceptos himenaeos. Morbi ac lacinia felis metus.";
  const char *hc_src = "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa";
  // Set and derive sizes.  Since we're using strings, use strlen() + 1 for \0.
  const size_t src_size = strlen(src) + 1;
  const size_t max_dst_size = LZ4_compressBound(src_size);
  int bytes_returned = 0;
  // Now build allocations for the data we'll be playing with.
  char *dst               = calloc(1, max_dst_size);
  char *known_good_dst    = calloc(1, max_dst_size);
  char *known_good_hc_dst = calloc(1, max_dst_size);
  if (dst == NULL || known_good_dst == NULL || known_good_hc_dst == NULL)
    run_screaming("Couldn't allocate memory for the destination buffers.  Sad :(", 1);
  // Create known-good buffers to verify our tests with other functions will produce the same results.
  bytes_returned = LZ4_compress_default(src, known_good_dst, src_size, max_dst_size);
  if (bytes_returned < 1)
    run_screaming("Couldn't create a known-good destination buffer for comparison... this is bad.", 1);
  const size_t src_comp_size = bytes_returned;
  bytes_returned = LZ4_compress_default(hc_src, known_good_hc_dst, src_size, max_dst_size);
  if (bytes_returned < 1)
    run_screaming("Couldn't create a known-good (highly compressible) destination buffer for comparison... this is bad.", 1);
  const size_t hc_src_comp_size = bytes_returned;
  /* LZ4_compress_default() */
  // This is the default function so we don't need to demonstrate how to use it.  See basics.c if you need more basal information.
  /* LZ4_compress_fast() */
  // Using this function is identical to LZ4_compress_default except we need to specify an "acceleration" value.  Defaults to 1.
  memset(dst, 0, max_dst_size);
  bytes_returned = LZ4_compress_fast(src, dst, src_size, max_dst_size, 1);
  if (bytes_returned < 1)
    run_screaming("Failed to compress src using LZ4_compress_fast.  echo $? for return code.", bytes_returned);
  if (memcmp(dst, known_good_dst, bytes_returned) != 0)
    run_screaming("According to memcmp(), the value we got in dst from LZ4_compress_fast doesn't match the known-good value.  This is bad.", 1);
  /* LZ4_compress_fast_extState() */
  // Using this function directly requires that we build an LZ4_stream_t struct ourselves.  We do NOT have to reset it ourselves.
  memset(dst, 0, max_dst_size);
  LZ4_stream_t state;
  bytes_returned = LZ4_compress_fast_extState(&state, src, dst, src_size, max_dst_size, 1);
  if (bytes_returned < 1)
    run_screaming("Failed to compress src using LZ4_compress_fast_extState.  echo $? for return code.", bytes_returned);
  if (memcmp(dst, known_good_dst, bytes_returned) != 0)
    run_screaming("According to memcmp(), the value we got in dst from LZ4_compress_fast_extState doesn't match the known-good value.  This is bad.", 1);
  /* LZ4_compress_generic */
  // When you can exactly control the inputs and options of your LZ4 needs, you can use LZ4_compress_generic and fixed (const)
  // values for the enum types such as dictionary and limitations.  Any other direct-use is probably a bad idea.
  //
  // That said, the LZ4_compress_generic() function is 'static inline' and does not have a prototype in lz4.h to expose a symbol
  // for it.  In other words: we can't access it directly.  I don't want to submit a PR that modifies lz4.c/h.  Yann and others can
  // do that if they feel it's worth expanding this example.
  //
  // I will, however, leave a skeleton of what would be required to use it directly:
  /*
    memset(dst, 0, max_dst_size);
    // LZ4_stream_t state:  is already declared above.  We can reuse it BUT we have to reset the stream ourselves between each call.
    LZ4_resetStream((LZ4_stream_t *)&state);
    // Since src size is small we know the following enums will be used:  notLimited (0), byU16 (2), noDict (0), noDictIssue (0).
    bytes_returned = LZ4_compress_generic(&state, src, dst, src_size, max_dst_size, notLimited, byU16, noDict, noDictIssue, 1);
    if (bytes_returned < 1)
      run_screaming("Failed to compress src using LZ4_compress_generic.  echo $? for return code.", bytes_returned);
    if (memcmp(dst, known_good_dst, bytes_returned) != 0)
      run_screaming("According to memcmp(), the value we got in dst from LZ4_compress_generic doesn't match the known-good value.  This is bad.", 1);
  */
  /* Benchmarking */
  /* Now we'll run a few rudimentary benchmarks with each function to demonstrate differences in speed based on the function used.
   * Remember, we cannot call LZ4_compress_generic() directly (yet) so it's disabled.
   */
  // Suite A - Normal Compressibility
  char *dst_d = calloc(1, src_size);
  memset(dst, 0, max_dst_size);
  printf("\nStarting suite A:  Normal compressible text.\n");
  uint64_t time_taken__default       = bench(known_good_dst, ID__LZ4_COMPRESS_DEFAULT,       iterations, src,            dst,   src_size, max_dst_size, src_comp_size);
  uint64_t time_taken__fast          = bench(known_good_dst, ID__LZ4_COMPRESS_FAST,          iterations, src,            dst,   src_size, max_dst_size, src_comp_size);
  uint64_t time_taken__fast_extstate = bench(known_good_dst, ID__LZ4_COMPRESS_FAST_EXTSTATE, iterations, src,            dst,   src_size, max_dst_size, src_comp_size);
  //uint64_t time_taken__generic       = bench(known_good_dst, ID__LZ4_COMPRESS_GENERIC,       iterations, src,            dst,   src_size, max_dst_size, src_comp_size);
  uint64_t time_taken__decomp_safe   = bench(src,            ID__LZ4_DECOMPRESS_SAFE,        iterations, known_good_dst, dst_d, src_size, max_dst_size, src_comp_size);
  uint64_t time_taken__decomp_fast   = bench(src,            ID__LZ4_DECOMPRESS_FAST,        iterations, known_good_dst, dst_d, src_size, max_dst_size, src_comp_size);
  // Suite B - Highly Compressible
  memset(dst, 0, max_dst_size);
  printf("\nStarting suite B:  Highly compressible text.\n");
  uint64_t time_taken_hc__default       = bench(known_good_hc_dst, ID__LZ4_COMPRESS_DEFAULT,       iterations, hc_src,            dst,   src_size, max_dst_size, hc_src_comp_size);
  uint64_t time_taken_hc__fast          = bench(known_good_hc_dst, ID__LZ4_COMPRESS_FAST,          iterations, hc_src,            dst,   src_size, max_dst_size, hc_src_comp_size);
  uint64_t time_taken_hc__fast_extstate = bench(known_good_hc_dst, ID__LZ4_COMPRESS_FAST_EXTSTATE, iterations, hc_src,            dst,   src_size, max_dst_size, hc_src_comp_size);
  //uint64_t time_taken_hc__generic       = bench(known_good_hc_dst, ID__LZ4_COMPRESS_GENERIC,       iterations, hc_src,            dst,   src_size, max_dst_size, hc_src_comp_size);
  uint64_t time_taken_hc__decomp_safe   = bench(hc_src,            ID__LZ4_DECOMPRESS_SAFE,        iterations, known_good_hc_dst, dst_d, src_size, max_dst_size, hc_src_comp_size);
  uint64_t time_taken_hc__decomp_fast   = bench(hc_src,            ID__LZ4_DECOMPRESS_FAST,        iterations, known_good_hc_dst, dst_d, src_size, max_dst_size, hc_src_comp_size);
  // Report and leave.
  setlocale(LC_ALL, "");
  const char *format        = "|%-14s|%-30s|%'14.9f|%'16d|%'14d|%'13.2f%%|\n";
  const char *header_format = "|%-14s|%-30s|%14s|%16s|%14s|%14s|\n";
  const char *separator     = "+--------------+------------------------------+--------------+----------------+--------------+--------------+\n";
  printf("\n");
  printf("%s", separator);
  printf(header_format, "Source", "Function Benchmarked", "Total Seconds", "Iterations/sec", "ns/Iteration", "% of default");
  printf("%s", separator);
  printf(format, "Normal Text", "LZ4_compress_default()",       (double)time_taken__default       / BILLION, (int)(iterations / ((double)time_taken__default       /BILLION)), (int)time_taken__default       / iterations, (double)time_taken__default       * 100 / time_taken__default);
  printf(format, "Normal Text", "LZ4_compress_fast()",          (double)time_taken__fast          / BILLION, (int)(iterations / ((double)time_taken__fast          /BILLION)), (int)time_taken__fast          / iterations, (double)time_taken__fast          * 100 / time_taken__default);
  printf(format, "Normal Text", "LZ4_compress_fast_extState()", (double)time_taken__fast_extstate / BILLION, (int)(iterations / ((double)time_taken__fast_extstate /BILLION)), (int)time_taken__fast_extstate / iterations, (double)time_taken__fast_extstate * 100 / time_taken__default);
  //printf(format, "Normal Text", "LZ4_compress_generic()",       (double)time_taken__generic       / BILLION, (int)(iterations / ((double)time_taken__generic       /BILLION)), (int)time_taken__generic       / iterations, (double)time_taken__generic       * 100 / time_taken__default);
  printf(format, "Normal Text", "LZ4_decompress_safe()",        (double)time_taken__decomp_safe   / BILLION, (int)(iterations / ((double)time_taken__decomp_safe   /BILLION)), (int)time_taken__decomp_safe   / iterations, (double)time_taken__decomp_safe   * 100 / time_taken__default);
  printf(format, "Normal Text", "LZ4_decompress_fast()",        (double)time_taken__decomp_fast   / BILLION, (int)(iterations / ((double)time_taken__decomp_fast   /BILLION)), (int)time_taken__decomp_fast   / iterations, (double)time_taken__decomp_fast   * 100 / time_taken__default);
  printf(header_format, "", "", "", "", "", "");
  printf(format, "Compressible", "LZ4_compress_default()",       (double)time_taken_hc__default       / BILLION, (int)(iterations / ((double)time_taken_hc__default       /BILLION)), (int)time_taken_hc__default       / iterations, (double)time_taken_hc__default       * 100 / time_taken_hc__default);
  printf(format, "Compressible", "LZ4_compress_fast()",          (double)time_taken_hc__fast          / BILLION, (int)(iterations / ((double)time_taken_hc__fast          /BILLION)), (int)time_taken_hc__fast          / iterations, (double)time_taken_hc__fast          * 100 / time_taken_hc__default);
  printf(format, "Compressible", "LZ4_compress_fast_extState()", (double)time_taken_hc__fast_extstate / BILLION, (int)(iterations / ((double)time_taken_hc__fast_extstate /BILLION)), (int)time_taken_hc__fast_extstate / iterations, (double)time_taken_hc__fast_extstate * 100 / time_taken_hc__default);
  //printf(format, "Compressible", "LZ4_compress_generic()",       (double)time_taken_hc__generic       / BILLION, (int)(iterations / ((double)time_taken_hc__generic       /BILLION)), (int)time_taken_hc__generic       / iterations, (double)time_taken_hc__generic       * 100 / time_taken_hc__default);
  printf(format, "Compressible", "LZ4_decompress_safe()",        (double)time_taken_hc__decomp_safe   / BILLION, (int)(iterations / ((double)time_taken_hc__decomp_safe   /BILLION)), (int)time_taken_hc__decomp_safe   / iterations, (double)time_taken_hc__decomp_safe   * 100 / time_taken_hc__default);
  printf(format, "Compressible", "LZ4_decompress_fast()",        (double)time_taken_hc__decomp_fast   / BILLION, (int)(iterations / ((double)time_taken_hc__decomp_fast   /BILLION)), (int)time_taken_hc__decomp_fast   / iterations, (double)time_taken_hc__decomp_fast   * 100 / time_taken_hc__default);
  printf("%s", separator);
  printf("\n");
  printf("All done, ran %d iterations per test.\n", iterations);
  return 0;
 }
--- a/examples/dictionaryRandomAccess.c
+++ b/examples/dictionaryRandomAccess.c
@ -0,0 +1,280 @@
 // LZ4 API example : Dictionary Random Access
 #if defined(_MSC_VER) && (_MSC_VER <= 1800)  /* Visual Studio <= 2013 */
 #  define _CRT_SECURE_NO_WARNINGS
 #  define snprintf sprintf_s
 #endif
 #include "lz4.h"
 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <string.h>
 #define MIN(x, y)  ((x) < (y) ? (x) : (y))
 enum {
    BLOCK_BYTES = 1024,  /* 1 KiB of uncompressed data in a block */
    DICTIONARY_BYTES = 1024, /* Load a 1 KiB dictionary */
    MAX_BLOCKS = 1024 /* For simplicity of implementation */
 };
 /**
 * Magic bytes for this test case.
 * This is not a great magic number because it is a common word in ASCII.
 * However, it is important to have some versioning system in your format.
 */
 const char kTestMagic[] = { 'T', 'E', 'S', 'T' };
 void write_int(FILE* fp, int i) {
    size_t written = fwrite(&i, sizeof(i), 1, fp);
    if (written != 1) { exit(10); }
 }
 void write_bin(FILE* fp, const void* array, size_t arrayBytes) {
    size_t written = fwrite(array, 1, arrayBytes, fp);
    if (written != arrayBytes) { exit(11); }
 }
 void read_int(FILE* fp, int* i) {
    size_t read = fread(i, sizeof(*i), 1, fp);
    if (read != 1) { exit(12); }
 }
 size_t read_bin(FILE* fp, void* array, size_t arrayBytes) {
    size_t read = fread(array, 1, arrayBytes, fp);
    if (ferror(fp)) { exit(12); }
    return read;
 }
 void seek_bin(FILE* fp, long offset, int origin) {
    if (fseek(fp, offset, origin)) { exit(14); }
 }
 void test_compress(FILE* outFp, FILE* inpFp, void *dict, int dictSize)
 {
    LZ4_stream_t lz4Stream_body;
    LZ4_stream_t* lz4Stream = &lz4Stream_body;
    char inpBuf[BLOCK_BYTES];
    int offsets[MAX_BLOCKS];
    int *offsetsEnd = offsets;
    LZ4_initStream(lz4Stream, sizeof(*lz4Stream));
    /* Write header magic */
    write_bin(outFp, kTestMagic, sizeof(kTestMagic));
    *offsetsEnd++ = sizeof(kTestMagic);
    /* Write compressed data blocks.  Each block contains BLOCK_BYTES of plain
       data except possibly the last. */
    for(;;) {
        const int inpBytes = (int) read_bin(inpFp, inpBuf, BLOCK_BYTES);
        if(0 == inpBytes) {
            break;
        }
        /* Forget previously compressed data and load the dictionary */
        LZ4_loadDict(lz4Stream, (const char*) dict, dictSize);
        {
            char cmpBuf[LZ4_COMPRESSBOUND(BLOCK_BYTES)];
            const int cmpBytes = LZ4_compress_fast_continue(
                lz4Stream, inpBuf, cmpBuf, inpBytes, sizeof(cmpBuf), 1);
            if(cmpBytes <= 0) { exit(1); }
            write_bin(outFp, cmpBuf, (size_t)cmpBytes);
            /* Keep track of the offsets */
            *offsetsEnd = *(offsetsEnd - 1) + cmpBytes;
            ++offsetsEnd;
        }
        if (offsetsEnd - offsets > MAX_BLOCKS) { exit(2); }
    }
    /* Write the tailing jump table */
    {
        int *ptr = offsets;
        while (ptr != offsetsEnd) {
            write_int(outFp, *ptr++);
        }
        write_int(outFp, (int) (offsetsEnd - offsets));
    }
 }
 void test_decompress(FILE* outFp, FILE* inpFp, void *dict, int dictSize, int offset, int length)
 {
    LZ4_streamDecode_t lz4StreamDecode_body;
    LZ4_streamDecode_t* lz4StreamDecode = &lz4StreamDecode_body;
    /* The blocks [currentBlock, endBlock) contain the data we want */
    int currentBlock = offset / BLOCK_BYTES;
    int endBlock = ((offset + length - 1) / BLOCK_BYTES) + 1;
    char decBuf[BLOCK_BYTES];
    int offsets[MAX_BLOCKS];
    /* Special cases */
    if (length == 0) { return; }
    /* Read the magic bytes */
    {
        char magic[sizeof(kTestMagic)];
        size_t read = read_bin(inpFp, magic, sizeof(magic));
        if (read != sizeof(magic)) { exit(1); }
        if (memcmp(kTestMagic, magic, sizeof(magic))) { exit(2); }
    }
    /* Read the offsets tail */
    {
        int numOffsets;
        int block;
        int *offsetsPtr = offsets;
        seek_bin(inpFp, -4, SEEK_END);
        read_int(inpFp, &numOffsets);
        if (numOffsets <= endBlock) { exit(3); }
        seek_bin(inpFp, -4 * (numOffsets + 1), SEEK_END);
        for (block = 0; block <= endBlock; ++block) {
            read_int(inpFp, offsetsPtr++);
        }
    }
    /* Seek to the first block to read */
    seek_bin(inpFp, offsets[currentBlock], SEEK_SET);
    offset = offset % BLOCK_BYTES;
    /* Start decoding */
    for(; currentBlock < endBlock; ++currentBlock) {
        char cmpBuf[LZ4_COMPRESSBOUND(BLOCK_BYTES)];
        /* The difference in offsets is the size of the block */
        int  cmpBytes = offsets[currentBlock + 1] - offsets[currentBlock];
        {
            const size_t read = read_bin(inpFp, cmpBuf, (size_t)cmpBytes);
            if(read != (size_t)cmpBytes) { exit(4); }
        }
        /* Load the dictionary */
        LZ4_setStreamDecode(lz4StreamDecode, (const char*) dict, dictSize);
        {
            const int decBytes = LZ4_decompress_safe_continue(
                lz4StreamDecode, cmpBuf, decBuf, cmpBytes, BLOCK_BYTES);
            if(decBytes <= 0) { exit(5); }
            {
                /* Write out the part of the data we care about */
                int blockLength = MIN(length, (decBytes - offset));
                write_bin(outFp, decBuf + offset, (size_t)blockLength);
                offset = 0;
                length -= blockLength;
            }
        }
    }
 }
 int compare(FILE* fp0, FILE* fp1, int length)
 {
    int result = 0;
    while(0 == result) {
        char b0[4096];
        char b1[4096];
        const size_t r0 = read_bin(fp0, b0, MIN(length, (int)sizeof(b0)));
        const size_t r1 = read_bin(fp1, b1, MIN(length, (int)sizeof(b1)));
        result = (int) r0 - (int) r1;
        if(0 == r0 || 0 == r1) {
            break;
        }
        if(0 == result) {
            result = memcmp(b0, b1, r0);
        }
        length -= r0;
    }
    return result;
 }
 int main(int argc, char* argv[])
 {
    char inpFilename[256] = { 0 };
    char lz4Filename[256] = { 0 };
    char decFilename[256] = { 0 };
    char dictFilename[256] = { 0 };
    int offset;
    int length;
    char dict[DICTIONARY_BYTES];
    int dictSize;
    if(argc < 5) {
        printf("Usage: %s input dictionary offset length", argv[0]);
        return 0;
    }
    snprintf(inpFilename, 256, "%s", argv[1]);
    snprintf(lz4Filename, 256, "%s.lz4s-%d", argv[1], BLOCK_BYTES);
    snprintf(decFilename, 256, "%s.lz4s-%d.dec", argv[1], BLOCK_BYTES);
    snprintf(dictFilename, 256, "%s", argv[2]);
    offset = atoi(argv[3]);
    length = atoi(argv[4]);
    printf("inp    = [%s]\n", inpFilename);
    printf("lz4    = [%s]\n", lz4Filename);
    printf("dec    = [%s]\n", decFilename);
    printf("dict   = [%s]\n", dictFilename);
    printf("offset = [%d]\n", offset);
    printf("length = [%d]\n", length);
    /* Load dictionary */
    {
        FILE* dictFp = fopen(dictFilename, "rb");
        dictSize = (int)read_bin(dictFp, dict, DICTIONARY_BYTES);
        fclose(dictFp);
    }
    /* compress */
    {
        FILE* inpFp = fopen(inpFilename, "rb");
        FILE* outFp = fopen(lz4Filename, "wb");
        printf("compress : %s -> %s\n", inpFilename, lz4Filename);
        test_compress(outFp, inpFp, dict, dictSize);
        printf("compress : done\n");
        fclose(outFp);
        fclose(inpFp);
    }
    /* decompress */
    {
        FILE* inpFp = fopen(lz4Filename, "rb");
        FILE* outFp = fopen(decFilename, "wb");
        printf("decompress : %s -> %s\n", lz4Filename, decFilename);
        test_decompress(outFp, inpFp, dict, DICTIONARY_BYTES, offset, length);
        printf("decompress : done\n");
        fclose(outFp);
        fclose(inpFp);
    }
    /* verify */
    {
        FILE* inpFp = fopen(inpFilename, "rb");
        FILE* decFp = fopen(decFilename, "rb");
        seek_bin(inpFp, offset, SEEK_SET);
        printf("verify : %s <-> %s\n", inpFilename, decFilename);
        const int cmp = compare(inpFp, decFp, length);
        if(0 == cmp) {
            printf("verify : OK\n");
        } else {
            printf("verify : NG\n");
        }
        fclose(decFp);
        fclose(inpFp);
    }
    return 0;
 }
--- a/examples/dictionaryRandomAccess.md
+++ b/examples/dictionaryRandomAccess.md
@ -0,0 +1,67 @@
 # LZ4 API Example : Dictionary Random Access
 `dictionaryRandomAccess.c` is LZ4 API example which implements dictionary compression and random access decompression.
 Please note that the output file is not compatible with lz4frame and is platform dependent.
 ## What's the point of this example ?
 - Dictionary based compression for homogeneous files.
 - Random access to compressed blocks.
 ## How the compression works
 Reads the dictionary from a file, and uses it as the history for each block.
 This allows each block to be independent, but maintains compression ratio.
 ```
    Dictionary
         +
         |
         v
    +---------+
    | Block#1 |
    +----+----+
         |
         v
      {Out#1}
    Dictionary
         +
         |
         v
    +---------+
    | Block#2 |
    +----+----+
         |
         v
      {Out#2}
 ```
 After writing the magic bytes `TEST` and then the compressed blocks, write out the jump table.
 The last 4 bytes is an integer containing the number of blocks in the stream.
 If there are `N` blocks, then just before the last 4 bytes is `N + 1` 4 byte integers containing the offsets at the beginning and end of each block.
 Let `Offset#K` be the total number of bytes written after writing out `Block#K` *including* the magic bytes for simplicity.
 ```
 +------+---------+     +---------+---+----------+     +----------+-----+
 | TEST | Block#1 | ... | Block#N | 4 | Offset#1 | ... | Offset#N | N+1 |
 +------+---------+     +---------+---+----------+     +----------+-----+
 ```
 ## How the decompression works
 Decompression will do reverse order.
 - Seek to the last 4 bytes of the file and read the number of offsets.
 - Read each offset into an array.
 - Seek to the first block containing data we want to read.
   We know where to look because we know each block contains a fixed amount of uncompressed data, except possibly the last.
 - Decompress it and write what data we need from it to the file.
 - Read the next block.
 - Decompress it and write that page to the file.
 Continue these procedures until all the required data has been read.
--- a/Show More
+++ b/Show More
		`@ -0,0 +1,2 @@`
							`@PACKAGE_INIT@`
							`include( "${CMAKE_CURRENT_LIST_DIR}/lz4Targets.cmake" )`