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new Methods-Extern.txt for Igor
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Tino Reichardt
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DOC/Methods-Extern.txt
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175
DOC/Methods-Extern.txt
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7-Zip external method IDs, that are not included to 7-Zip
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---------------------------------------------------------
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History of this document
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------------------------
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- 7-Zip Version 15.01, initial release
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Overview of defined ID ranges
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-----------------------------
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F7 0x xx - reserved
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F7 10 xx - LZHAM
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F7 11 xx - ZStandard
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F7 12 xx - LZ4
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F7 13 xx - LZ5
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Range F7 10 xx - LZHAM
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-----------------------
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Description:
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Lossless data compression codec with LZMA-like ratios but 1.5x-8x faster
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decompression speed, C/C++
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License:
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LZHAM library is provided as open source software using a MIT license.
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7-Zip Container Header:
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Byte _ver_major;
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Byte _ver_minor;
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Byte _level;
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Byte _reserved[2];
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Algorithm author: Rich Geldreich
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Algorithm Homepage: https://github.com/richgel999/lzham_codec
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Source code: https://github.com/richgel999/lzham_codec
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Codec plugin author: Rich Geldreich
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Codec Homepage: http://richg42.blogspot.de/2015/02/lzham-10-integrated-into-7zip-command.html
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Source Code: http://www.tenacioussoftware.com/7zipsrc_release3_lzham_1_0.7z
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Versions:
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The 7-Zip LZHAM codec will be kept in sync with the current releases of ZStandard.
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Range F7 11 xx, ZStandard
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-------------------------
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Description:
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Zstandard is a real-time compression algorithm, providing high compression
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ratios. It offers a very wide range of compression / speed trade-off, while
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being backed by a very fast decoder (see benchmarks below). It also offers a
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special mode for small data, called dictionary compression, and can create
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dictionaries from any sample set.
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License:
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Zstandard library is provided as open source software using a BSD license.
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7-Zip Container Header:
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Byte _ver_major;
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Byte _ver_minor;
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Byte _level;
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Byte _reserved[2];
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Algorithm author: Yann Collet
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Algorithm Homepage: https://facebook.github.io/zstd/
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Source code: https://github.com/facebook/zstd
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Codec plugin author: Tino Reichardt
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Codec Homepage: https://mcmilk.de/projects/7-Zip-zstd/
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Source Code: https://github.com/mcmilk/7-Zip-zstd
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Modes:
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- threading is supported through skippable frame id 0x184D2A50U
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- all levels are supported (1..22)
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- future version of zstd will support multi threading out of the box
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-> this new format is fully compatible with the one within this codec
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- the codec is used as archiv handler also, see ZstdHandler.cpp
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- this handler is does not use any additional headers, it supports the plain
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zstd v1.0 format (this covers all current v1.x implemetations)
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- when compiled with ZSTD_LEGACY_SUPPORT, then support is increased to these
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addtional version numbers of zstd: v0.1 up v0.7
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- future formats of this algorithm will be fully compatible with release v1.0 of
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ZStandard (ZStandard 0.8 == ZStandard 1.0)
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- one ID should be okay for this codec
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Versions:
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The 7-Zip codec will be kept in sync with the current releases of ZStandard.
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Range F7 12 xx, LZ4
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-------------------
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Description:
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LZ4 is lossless compression algorithm, providing compression speed at 400 MB/s
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per core (0.16 Bytes/cycle). It features an extremely fast decoder, with speed
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in multiple GB/s per core (0.71 Bytes/cycle). A high compression derivative,
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called LZ4_HC, is available, trading customizable CPU time for compression
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ratio. LZ4 library is provided as open source software using a BSD license.
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License:
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LZ4 library is provided as open source software using a BSD license.
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7-Zip Container Header:
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Byte _ver_major; // currently 1
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Byte _ver_minor; // currently 7
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Byte _level; // 1..16
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Byte _reserved[2];
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Algorithm author: Yann Collet
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Algorithm Homepage: https://lz4.github.io/lz4/
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Source code: https://github.com/lz4/lz4
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Codec plugin author: Tino Reichardt
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Codec Homepage: https://mcmilk.de/projects/7-Zip-zstd/
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Source Code: https://github.com/mcmilk/7-Zip-zstd
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Modes:
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- threading is supported through skippable frame id 0x184D2A50U
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- all levels of LZ4 v1.7.4 are supported (1..16)
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- the codec is used as archiv handler also, see Lz4Handler.cpp
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- this handler is does not use any additional headers, it supports the plain
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lz4 v1.7.4 format (this covers all current lz4 implemetations)
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- future formats of this algorithm should be fully compatible with current
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release
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- one ID should be okay for this codec
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Versions:
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The 7-Zip codec will be kept in sync with the current releases of LZ4.
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Range F7 13 xx, LZ5
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-------------------
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Description:
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LZ5 is a modification of LZ4 which gives a better ratio at cost of slower
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compression and decompression.
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License:
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LZ5 library is provided as open source software using a BSD license.
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7-Zip Container Header:
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Byte _ver_major; // currently 1
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Byte _ver_minor; // currently 5
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Byte _level; // 1..16
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Byte _reserved[2];
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Algorithm author: Przemyslaw Skibinski
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Algorithm Homepage: https://github.com/inikep/lz5
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Source code: https://github.com/inikep/lz5
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Codec plugin author: Tino Reichardt
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Codec Homepage: https://mcmilk.de/projects/7-Zip-zstd/
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Source Code: https://github.com/mcmilk/7-Zip-zstd
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Modes:
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- threading is supported through skippable frame id 0x184D2A50U
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- all levels of v1.5 are supported (1..16)
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- the codec is used as archiv handler also, see Lz5Handler.cpp
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- this handler is does not use any additional headers, it supports the plain
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lz5 v1.5 format
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- future formats of this algorithm will not be compatible with current release,
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this codec is very experimental
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- multiple ID's are required for this codec
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Versions:
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The 7-Zip codec will be kept in sync with the current releases of LZ5.
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The current codec plugin supports version v1.5. Version 2.0 will follow, when it
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seems to be stable.
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---
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End of document
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Tino Reichardt, 2016-12-28
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