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49 lines
1.5 KiB
Markdown
49 lines
1.5 KiB
Markdown
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# Multithreading Library for [Brotli], [Lizard], [LZ4], [LZ5] and [Zstandard]
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## Description
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- works with skippables frame id 0x184D2A50 (12 bytes per compressed frame)
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- brotli is supported the same way, it will encapsulate the real brotli stream
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within an 16 byte frame header
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## Generic skippable frame definition
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- the frame header for [Lizard], [LZ4], [LZ5] and [Zstandard] is like this:
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size | value | description
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--------|-------------------|------------
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4 bytes | 0x184D2A50U | magic for skippable frame
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4 bytes | 4 | size of skippable frame
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4 bytes | compressed size | size of the following frame (compressed data)
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## [Brotli] frame definition
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- the frame header for brotli is defined a bit different:
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size | value | description
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--------|-------------------|------------
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4 bytes | 0x184D2A50U | magic for skippable frame (like zstd)
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4 bytes | 8 | size of skippable frame
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4 bytes | compressed size | size of the following frame (compressed data)
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2 bytes | 0x5242U | magic for brotli "BR"
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2 bytes | uncompressed size | allocation hint for decompressor (64KB * this size)
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## Usage of the Testutils
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- see [programs](https://github.com/mcmilk/zstdmt/tree/master/programs)
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## Usage of the Library
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- see [lib](https://github.com/mcmilk/zstdmt/tree/master/lib)
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[Brotli]:https://github.com/google/brotli/
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[LZ4]:https://github.com/lz4/lz4/
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[LZ5]:https://github.com/inikep/lz5/
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[Zstandard]:https://github.com/facebook/zstd/
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[Lizard]:https://github.com/inikep/lizard/
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/TR 2017-05-24
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