http://fileformats.archiveteam.org/api.php?action=feedcontributions&feedformat=atom&user=AndarielJust Solve the File Format Problem - User contributions [en]2026-04-21T20:11:58ZUser contributionsMediaWiki 1.19.2http://fileformats.archiveteam.org/wiki/XZXZ2017-03-02T15:32:40Z<p>Andariel: </p>
<hr />
<div>{{FormatInfo<br />
|formattype=electronic<br />
|subcat=Compression<br />
|extensions={{ext|xz}}<br />
|mimetypes={{mimetype|application/x-xz}}<br />
}}<br />
'''XZ''' is a stream compression format with built-in integrity checks. It uses [[LZMA2]] compression. Compressed streams are able to be concatenated and still be decompressible like a single-stream file.<br />
<br />
XZ is a successor to [[LZMA Alone|LZMA_Alone]] format, and an alternative to [[Lzip]].<br />
<br />
== Identification ==<br />
XZ files always have lengths that are multiples of 4 bytes, and they begin with a 6-byte "magic" sequence of (hex) FD 37 7A 58 5A 00 and end with footer "magic bytes" of 59 5A. (The ending bytes can be verified as a sign that the file has not been truncated in transmission.)<br />
<br />
== Software ==<br />
* [[7-Zip]]<br />
* [http://7-zip.org/sdk.html LZMA SDK]<br />
* [http://tukaani.org/xz/ XZ Utils]:<br />
** <code>xz</code>, <code>unxz</code>, <code>xzcat</code>, etc.<br />
** <code>xzdec</code><br />
** liblzma<br />
* [http://tukaani.org/xz/embedded.html XZ Embedded]<br />
<br />
== References ==<br />
* [http://tukaani.org/xz/xz-file-format.txt Current spec]<br />
* [http://tukaani.org/xz/format.html Official site] (has historical specs with other info)<br />
* [[Wikipedia:xz|Wikipedia article]]<br />
* [http://www.nongnu.org/lzip/xz_inadequate.html Xz format inadequate for long-term archiving] - Analysis of weaknesses and design errors in the xz format, by the author of another format</div>Andariel