Zstandard
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|subcat=Compression | |subcat=Compression | ||
|extensions={{ext|zst}} | |extensions={{ext|zst}} | ||
| + | |mimetypes={{mimetype|application/zstd}} | ||
|released=2015 | |released=2015 | ||
}} | }} | ||
'''Zstandard''', or '''Zstd''', is a general-purpose compression algorithm and file format. It is designed to have a good balance between compression ratio, compression speed, and decompression speed. | '''Zstandard''', or '''Zstd''', is a general-purpose compression algorithm and file format. It is designed to have a good balance between compression ratio, compression speed, and decompression speed. | ||
| + | Zstandard is able to use [[Zstandard dictionary|a "dictionary" format]] to make compression of files of an already known type more efficient. | ||
== Identification == | == Identification == | ||
| − | + | ||
| + | Since version 0.8.0 (August 2016<ref>https://github.com/facebook/zstd/releases/tag/v0.8.0</ref>), the header is instead {{magic|28 b5 2f fd}}<ref>https://github.com/facebook/zstd/blob/dev/lib/zstd.h, definition of ZSTD_MAGICNUMBER</ref>. | ||
| + | |||
| + | === Legacy magic numbers === | ||
| + | |||
| + | Prior to 0.8.0 magic numbers were created for each new version, so for example 0.5.0 beggan with signature bytes {{magic|25 b5 2f fd}}. | ||
| + | |||
| + | Magic numbers are listed in legacy header files in the Zstandard library. | ||
| + | |||
| + | * [https://github.com/facebook/zstd/blob/6e58e9a2c42ea344708b72a14052b3bd4581e118/lib/legacy/zstd_v01.h#L86-L87 0.1.0] | ||
| + | * [https://github.com/facebook/zstd/blob/6e58e9a2c42ea344708b72a14052b3bd4581e118/lib/legacy/zstd_v02.h#L86 0.2.0] | ||
| + | * [https://github.com/facebook/zstd/blob/6e58e9a2c42ea344708b72a14052b3bd4581e118/lib/legacy/zstd_v03.h#L86 0.3.0] | ||
| + | * [https://github.com/facebook/zstd/blob/6e58e9a2c42ea344708b72a14052b3bd4581e118/lib/legacy/zstd_v04.h#L135 0.4.0] | ||
| + | * [https://github.com/facebook/zstd/blob/6e58e9a2c42ea344708b72a14052b3bd4581e118/lib/legacy/zstd_v05.h#L153 0.5.0] | ||
| + | * [https://github.com/facebook/zstd/blob/6e58e9a2c42ea344708b72a14052b3bd4581e118/lib/legacy/zstd_v06.h#L164 0.6.0] | ||
| + | * [https://github.com/facebook/zstd/blob/6e58e9a2c42ea344708b72a14052b3bd4581e118/lib/legacy/zstd_v07.h#L180 0.7.0] | ||
== Software == | == Software == | ||
Latest revision as of 05:27, 23 October 2025
Zstandard, or Zstd, is a general-purpose compression algorithm and file format. It is designed to have a good balance between compression ratio, compression speed, and decompression speed.
Zstandard is able to use a "dictionary" format to make compression of files of an already known type more efficient.
Contents |
[edit] Identification
Since version 0.8.0 (August 2016[1]), the header is instead 28 b5 2f fd[2].
[edit] Legacy magic numbers
Prior to 0.8.0 magic numbers were created for each new version, so for example 0.5.0 beggan with signature bytes 25 b5 2f fd.
Magic numbers are listed in legacy header files in the Zstandard library.
[edit] Software
- Zstandard →
zstd,unzstd,zstdcat
[edit] Links
[edit] References
- ↑ https://github.com/facebook/zstd/releases/tag/v0.8.0
- ↑ https://github.com/facebook/zstd/blob/dev/lib/zstd.h, definition of ZSTD_MAGICNUMBER
