README.md - lz4 - Rivoreo Source Code Repositories

 LZ4 - Extremely fast compression
 ================================

 LZ4 is lossless compression algorithm,
 providing compression speed at 400 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 more speed up.
 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 library is provided as open-source software using BSD 2-Clause license.


 |Branch      |Status   |
 |------------|---------|
 |master      | [![Build Status][travisMasterBadge]][travisLink] [![Build status][AppveyorMasterBadge]][AppveyorLink] [![coverity][coverBadge]][coverlink] |
 |dev         | [![Build Status][travisDevBadge]][travisLink]    [![Build status][AppveyorDevBadge]][AppveyorLink]                                         |

 [travisMasterBadge]: https://travis-ci.org/lz4/lz4.svg?branch=master "Continuous Integration test suite"
 [travisDevBadge]: https://travis-ci.org/lz4/lz4.svg?branch=dev "Continuous Integration test suite"
 [travisLink]: https://travis-ci.org/lz4/lz4
 [AppveyorMasterBadge]: https://ci.appveyor.com/api/projects/status/v6kxv9si529477cq/branch/master?svg=true "Visual test suite"
 [AppveyorDevBadge]: https://ci.appveyor.com/api/projects/status/v6kxv9si529477cq/branch/dev?svg=true "Visual test suite"
 [AppveyorLink]: https://ci.appveyor.com/project/YannCollet/lz4
 [coverBadge]: https://scan.coverity.com/projects/4735/badge.svg "Static code analysis of Master branch"
 [coverlink]: https://scan.coverity.com/projects/4735

 > **Branch Policy:**

 > - The "master" branch is considered stable, at all times.
 > - The "dev" branch is the one where all contributions must be merged
     before being promoted to 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.

 Benchmarks
 -------------------------

 The benchmark uses the [Open-Source Benchmark program by m^2 (v0.14.3)]
 compiled with GCC v4.8.2 on Linux Mint 64-bits v17.
 The reference system uses a Core i5-4300U @1.9GHz.
 Benchmark evaluates the compression of reference [Silesia Corpus]
 in single-thread mode.

 |  Compressor          | Ratio   | Compression | Decompression |
 |  ----------          | -----   | ----------- | ------------- |
 |  memcpy              |  1.000  | 4200 MB/s   |   4200 MB/s   |
 |**LZ4 fast 17 (r129)**|  1.607  |**690 MB/s** | **2220 MB/s** |
 |**LZ4 default (r129)**|**2.101**|**385 MB/s** | **1850 MB/s** |
 |  LZO 2.06            |  2.108  |  350 MB/s   |    510 MB/s   |
 |  QuickLZ 1.5.1.b6    |  2.238  |  320 MB/s   |    380 MB/s   |
 |  Snappy 1.1.0        |  2.091  |  250 MB/s   |    960 MB/s   |
 |  [Zstandard] 0.5.1   |  2.876  |  240 MB/s   |    620 MB/s   |
 |  LZF v3.6            |  2.073  |  175 MB/s   |    500 MB/s   |
 |  [zlib] 1.2.8 -1     |  2.730  |   59 MB/s   |    250 MB/s   |
 |**LZ4 HC (r129)**     |**2.720**|   22 MB/s   | **1830 MB/s** |
 |  [zlib] 1.2.8 -6     |  3.099  |   18 MB/s   |    270 MB/s   |

 [zlib]: http://www.zlib.net/
 [Zstandard]: http://www.zstd.net/


 Documentation
 -------------------------

 The raw LZ4 block compression format is detailed within [lz4_Block_format].

 To compress an arbitrarily long file or data stream, multiple blocks are required.
 Organizing these blocks and providing a common header format to handle their content
 is the purpose of the Frame format, defined into [lz4_Frame_format].
 Interoperable versions of LZ4 must respect this frame format.


 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].


 [Open-Source Benchmark program by m^2 (v0.14.3)]: http://encode.ru/threads/1371-Filesystem-benchmark?p=34029&viewfull=1#post34029
 [Silesia Corpus]: http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia
 [lz4_Block_format]: doc/lz4_Block_format.md
 [lz4_Frame_format]: doc/lz4_Frame_format.md
 [LZ4 Homepage]: http://www.lz4.org
	LZ4 - Extremely fast compression
	================================

	LZ4 is lossless compression algorithm,
	providing compression speed at 400 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 more speed up.
	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 library is provided as open-source software using BSD 2-Clause license.


	\|Branch \|Status \|
	\|------------\|---------\|
	\|master \| [![Build Status][travisMasterBadge]][travisLink] [![Build status][AppveyorMasterBadge]][AppveyorLink] [![coverity][coverBadge]][coverlink] \|
	\|dev \| [![Build Status][travisDevBadge]][travisLink] [![Build status][AppveyorDevBadge]][AppveyorLink] \|

	[travisMasterBadge]: https://travis-ci.org/lz4/lz4.svg?branch=master "Continuous Integration test suite"
	[travisDevBadge]: https://travis-ci.org/lz4/lz4.svg?branch=dev "Continuous Integration test suite"
	[travisLink]: https://travis-ci.org/lz4/lz4
	[AppveyorMasterBadge]: https://ci.appveyor.com/api/projects/status/v6kxv9si529477cq/branch/master?svg=true "Visual test suite"
	[AppveyorDevBadge]: https://ci.appveyor.com/api/projects/status/v6kxv9si529477cq/branch/dev?svg=true "Visual test suite"
	[AppveyorLink]: https://ci.appveyor.com/project/YannCollet/lz4
	[coverBadge]: https://scan.coverity.com/projects/4735/badge.svg "Static code analysis of Master branch"
	[coverlink]: https://scan.coverity.com/projects/4735

	> Branch Policy:

	> - The "master" branch is considered stable, at all times.
	> - The "dev" branch is the one where all contributions must be merged
	before being promoted to 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.

	Benchmarks
	-------------------------

	The benchmark uses the [Open-Source Benchmark program by m^2 (v0.14.3)]
	compiled with GCC v4.8.2 on Linux Mint 64-bits v17.
	The reference system uses a Core i5-4300U @1.9GHz.
	Benchmark evaluates the compression of reference [Silesia Corpus]
	in single-thread mode.

	\| Compressor \| Ratio \| Compression \| Decompression \|
	\| ---------- \| ----- \| ----------- \| ------------- \|
	\| memcpy \| 1.000 \| 4200 MB/s \| 4200 MB/s \|
	\|LZ4 fast 17 (r129)\| 1.607 \|690 MB/s \| 2220 MB/s \|
	\|LZ4 default (r129)\|2.101\|385 MB/s \| 1850 MB/s \|
	\| LZO 2.06 \| 2.108 \| 350 MB/s \| 510 MB/s \|
	\| QuickLZ 1.5.1.b6 \| 2.238 \| 320 MB/s \| 380 MB/s \|
	\| Snappy 1.1.0 \| 2.091 \| 250 MB/s \| 960 MB/s \|
	\| [Zstandard] 0.5.1 \| 2.876 \| 240 MB/s \| 620 MB/s \|
	\| LZF v3.6 \| 2.073 \| 175 MB/s \| 500 MB/s \|
	\| [zlib] 1.2.8 -1 \| 2.730 \| 59 MB/s \| 250 MB/s \|
	\|LZ4 HC (r129) \|2.720\| 22 MB/s \| 1830 MB/s \|
	\| [zlib] 1.2.8 -6 \| 3.099 \| 18 MB/s \| 270 MB/s \|

	[zlib]: http://www.zlib.net/
	[Zstandard]: http://www.zstd.net/


	Documentation
	-------------------------

	The raw LZ4 block compression format is detailed within [lz4_Block_format].

	To compress an arbitrarily long file or data stream, multiple blocks are required.
	Organizing these blocks and providing a common header format to handle their content
	is the purpose of the Frame format, defined into [lz4_Frame_format].
	Interoperable versions of LZ4 must respect this frame format.


	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].


	[Open-Source Benchmark program by m^2 (v0.14.3)]: http://encode.ru/threads/1371-Filesystem-benchmark?p=34029&viewfull=1#post34029
	[Silesia Corpus]: http://sun.aei.polsl.pl/~sdeor/index.php?page=silesia
	[lz4_Block_format]: doc/lz4_Block_format.md
	[lz4_Frame_format]: doc/lz4_Frame_format.md
	[LZ4 Homepage]: http://www.lz4.org