platform: fix unaligned 64-bit accesses on AArch32 (#699)

Ensures that Aarch32 Arm builds with an Armv8 compiler do not set

This scenario is possible with ChromeOS builds, as they may use a
toolchain with the target armv7-cros-gnueabi, but with -march=armv8.
This will set __ARM_ARCH to 8 (defining BROTLI_TARGET_ARMV8), but will
also set __ARM_32BIT_STATE and not __ARM_64BIT_STATE. Without this,
illegal 64-bit non-word-aligned reads (LDRD) may be emitted.

Also fix unaligned 64-bit reads on AArch32 - STRD was still possible to
1 file changed
tree: 732e01a11a8efdb441fdbeb9a97e642251751794
  1. .editorconfig
  2. .gitignore
  3. .gitmodules
  4. .travis.yml
  5. BUILD
  6. CMakeLists.txt
  10. Makefile
  12. README
  15. bootstrap
  16. c/
  17. configure
  18. configure-cmake
  20. csharp/
  21. docs/
  22. fetch-spec/
  23. go/
  24. java/
  25. js/
  26. premake5.lua
  27. python/
  28. research/
  29. scripts/
  30. setup.cfg
  32. tests/


Brotli is a generic-purpose lossless compression algorithm that compresses data using a combination of a modern variant of the LZ77 algorithm, Huffman coding and 2nd order context modeling, with a compression ratio comparable to the best currently available general-purpose compression methods. It is similar in speed with deflate but offers more dense compression.

The specification of the Brotli Compressed Data Format is defined in RFC 7932.

Brotli is open-sourced under the MIT License, see the LICENSE file.

Brotli mailing list:!forum/brotli

TravisCI Build Status AppVeyor Build Status

Build instructions

Autotools-style CMake

configure-cmake is an autotools-style configure script for CMake-based projects (not supported on Windows).

The basic commands to build, test and install brotli are:

$ mkdir out && cd out
$ ../configure-cmake
$ make
$ make test
$ make install

By default, debug binaries are built. To generate “release” Makefile specify --disable-debug option to configure-cmake.


See Bazel


The basic commands to build and install brotli are:

$ mkdir out && cd out
$ cmake -DCMAKE_BUILD_TYPE=Release -DCMAKE_INSTALL_PREFIX=./installed ..
$ cmake --build . --config Release --target install

You can use other CMake configuration.


See Premake5


To install the latest release of the Python module, run the following:

$ pip install brotli

To install the tip-of-the-tree version, run:

$ pip install --upgrade git+

See the Python readme for more details on installing from source, development, and testing.


Related projects

Disclaimer: Brotli authors take no responsibility for the third party projects mentioned in this section.

Independent decoder implementation by Mark Adler, based entirely on format specification.

JavaScript port of brotli decoder. Could be used directly via npm install brotli

Hand ported decoder / encoder in haxe by Dominik Homberger. Output source code: JavaScript, PHP, Python, Java and C#

7Zip plugin

Dart native bindings