b5033d0e1e
According to the format specification regarding complex prefix codes: > If there are at least two non-zero code lengths, any trailing zero > code lengths are omitted, i.e., the last code length in the > sequence must be non-zero. In this case, the sum of (32 >> code > length) over all the non-zero code lengths must equal to 32. > If the lengths have been read for the entire code length alphabet > and there was only one non-zero code length, then the prefix code > has one symbol whose code has zero length. The script does not handle a case where there is just 1 non-zero code length where the sum rule doesn't apply, which causes a StopIteration exception when it attempts to read past the list boundaries. An example of such file is tests/testdata/mapsdatazrh.compressed. I made sure this change doesn't break anything by processing all *.compressed files from the testdata folder with no thrown exceptions. |
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Introduction
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: https://groups.google.com/forum/#!forum/brotli
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.
Bazel
See Bazel
CMake
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.
Premake5
See Premake5
Python
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+https://github.com/google/brotli
See the Python readme for more details on installing from source, development, and testing.
Benchmarks
- Squash Compression Benchmark / Unstable Squash Compression Benchmark
- Large Text Compression Benchmark
- Lzturbo Benchmark
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