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diff --git a/README.md b/README.md index 377ae0843978..3755315ad688 100644 --- a/README.md +++ b/README.md @@ -1,14 +1,15 @@ - __Zstandard__, or `zstd` as short version, is a fast lossless compression algorithm, - targeting real-time compression scenarios at zlib-level and better compression ratios. +<p align="center"><img src="https://raw.githubusercontent.com/facebook/zstd/readme/doc/images/zstd_logo86.png" alt="Zstandard"></p> -It is provided as an open-source BSD-licensed **C** library, -and a command line utility producing and decoding `.zst` and `.gz` files. -For other programming languages, -you can consult a list of known ports on [Zstandard homepage](http://www.zstd.net/#other-languages). +__Zstandard__, or `zstd` as short version, is a fast lossless compression algorithm, +targeting real-time compression scenarios at zlib-level and better compression ratios. +It's backed by a very fast entropy stage, provided by [Huff0 and FSE library](https://github.com/Cyan4973/FiniteStateEntropy). -| dev branch status | -|-------------------| -| [![Build Status][travisDevBadge]][travisLink] [![Build status][AppveyorDevBadge]][AppveyorLink] [![Build status][CircleDevBadge]][CircleLink] +The project is provided as an open-source BSD-licensed **C** library, +and a command line utility producing and decoding `.zst`, `.gz`, `.xz` and `.lz4` files. +Should your project require another programming language, +a list of known ports and bindings is provided on [Zstandard homepage](http://www.zstd.net/#other-languages). + +Development branch status : [![Build Status][travisDevBadge]][travisLink] [![Build status][AppveyorDevBadge]][AppveyorLink] [![Build status][CircleDevBadge]][CircleLink] [travisDevBadge]: https://travis-ci.org/facebook/zstd.svg?branch=dev "Continuous Integration test suite" [travisLink]: https://travis-ci.org/facebook/zstd @@ -17,8 +18,9 @@ you can consult a list of known ports on [Zstandard homepage](http://www.zstd.ne [CircleDevBadge]: https://circleci.com/gh/facebook/zstd/tree/dev.svg?style=shield "Short test suite" [CircleLink]: https://circleci.com/gh/facebook/zstd +### Benchmarks -As a reference, several fast compression algorithms were tested and compared +For reference, several fast compression algorithms were tested and compared on a server running Linux Debian (`Linux version 4.8.0-1-amd64`), with a Core i7-6700K CPU @ 4.0GHz, using [lzbench], an open-source in-memory benchmark by @inikep @@ -43,7 +45,9 @@ on the [Silesia compression corpus]. [LZ4]: http://www.lz4.org/ Zstd can also offer stronger compression ratios at the cost of compression speed. -Speed vs Compression trade-off is configurable by small increments. Decompression speed is preserved and remains roughly the same at all settings, a property shared by most LZ compression algorithms, such as [zlib] or lzma. +Speed vs Compression trade-off is configurable by small increments. +Decompression speed is preserved and remains roughly the same at all settings, +a property shared by most LZ compression algorithms, such as [zlib] or lzma. The following tests were run on a server running Linux Debian (`Linux version 4.8.0-1-amd64`) @@ -56,8 +60,8 @@ Compression Speed vs Ratio | Decompression Speed ---------------------------|--------------------  |  -Several algorithms can produce higher compression ratios, but at slower speeds, falling outside of the graph. -For a larger picture including very slow modes, [click on this link](doc/images/DCspeed5.png) . +A few other algorithms can produce higher compression ratios at slower speeds, falling outside of the graph. +For a larger picture including slow modes, [click on this link](doc/images/DCspeed5.png). ### The case for Small Data compression @@ -84,7 +88,7 @@ Training works if there is some correlation in a family of small data samples. T Hence, deploying one dictionary per type of data will provide the greatest benefits. Dictionary gains are mostly effective in the first few KB. Then, the compression algorithm will gradually use previously decoded content to better compress the rest of the file. -#### Dictionary compression How To : +#### Dictionary compression How To: 1) Create the dictionary @@ -99,19 +103,16 @@ Dictionary gains are mostly effective in the first few KB. Then, the compression `zstd -D dictionaryName --decompress FILE.zst` -### Build - -Once you have the repository cloned, there are multiple ways provided to build Zstandard. +### Build instructions #### Makefile -If your system is compatible with a standard `make` (or `gmake`) binary generator, -you can simply run it at the root directory. -It will generate `zstd` within root directory. +If your system is compatible with standard `make` (or `gmake`), +invoking `make` in root directory will generate `zstd` cli in root directory. -Other available options include : -- `make install` : create and install zstd binary, library and man page -- `make test` : create and run `zstd` and test tools on local platform +Other available options include: +- `make install` : create and install zstd cli, library and man pages +- `make check` : create and run `zstd`, tests its behavior on local platform #### cmake @@ -125,9 +126,9 @@ A Meson project is provided within `contrib/meson`. #### Visual Studio (Windows) -Going into `build` directory, you will find additional possibilities : -- Projects for Visual Studio 2005, 2008 and 2010 - + VS2010 project is compatible with VS2012, VS2013 and VS2015 +Going into `build` directory, you will find additional possibilities: +- Projects for Visual Studio 2005, 2008 and 2010. + + VS2010 project is compatible with VS2012, VS2013 and VS2015. - Automated build scripts for Visual compiler by @KrzysFR , in `build/VS_scripts`, which will build `zstd` cli and `libzstd` library without any need to open Visual Studio solution. @@ -143,11 +144,7 @@ Zstandard is dual-licensed under [BSD](LICENSE) and [GPLv2](COPYING). ### Contributing -The "dev" branch is the one where all contributions will be merged before reaching "master". -If you plan to propose a patch, please commit into the "dev" branch or its own feature branch. +The "dev" branch is the one where all contributions are merged before reaching "master". +If you plan to propose a patch, please commit into the "dev" branch, or its own feature branch. Direct commit to "master" are not permitted. For more information, please read [CONTRIBUTING](CONTRIBUTING.md). - -### Miscellaneous - -Zstd entropy stage is provided by [Huff0 and FSE, from Finite State Entropy library](https://github.com/Cyan4973/FiniteStateEntropy). |