XZ

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File Format
Name XZ
Ontology
Extension(s) .xz
MIME Type(s) application/x-xz
PRONOM fmt/1098
Wikidata ID Q162839
Compression lossless, mandatory
Magic Bytes FD 37 7A 58 5A 00
Released 2009[1]

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.

XZ is a successor to LZMA_Alone format, and an alternative to Lzip. The compression format is offered as an option among the likes of:

Contents

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Identification

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.)

Software

Sample files

Links

References

  1. The .xz File Format - Version 1.0.0 (2009-01-14) - tukaani.org
  2. extract-vmlinux shell script (line 52) - Linus Torvalds' kernel - GitHub
  3. dracut.conf.5.adoc - dracut-ng manual pages - GitHub
  4. mkinitcpio.conf (lines 61-67) - mkinitcpio - Arch Linux GitLab
  5. manpage.md (line 57) - booster - GitHub
  6. compressor.c (lines 31-77) - squashfs-tools - GitHub
  7. 8.1.1 Creating and Reading Compressed Archives - GNU tar 1.35 online manual (single page) - gnu.org
  8. lzma.cpp - DWARFS - GitHub
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