XZ - Revision history

Anonymoususer852: Added link for magic bytes, only for FormatInfo.

2025-08-16T10:58:58Z

Added link for magic bytes, only for FormatInfo.

Anonymoususer852: Added DWARFS as a user of XZ via liblzma.

2025-08-16T10:46:01Z

Added DWARFS as a user of XZ via liblzma.

Anonymoususer852: Adjusted layout for where xz/lzma2 is used under Linux for legibility sake.

2025-08-16T08:39:32Z

Adjusted layout for where xz/lzma2 is used under Linux for legibility sake.

Anonymoususer852: Typo fix for GNU tar referenced link.

2025-08-16T08:13:44Z

Typo fix for GNU tar referenced link.

Anonymoususer852: Updated links, added examples where xz/lzma2 is used under Linux with citations, added more information into FormatInfo, added discmaster.textfiles.com custom search for Sample files section.

2025-08-16T08:08:56Z

Updated links, added examples where xz/lzma2 is used under Linux with citations, added more information into FormatInfo, added discmaster.textfiles.com custom search for Sample files section.

Dexvertbot: Change telparia.com samples link to template

2023-12-28T02:55:03Z

Change telparia.com samples link to template

Sembiance: Added sample files

2022-04-30T21:15:16Z

Added sample files

Jsummers: PRONOM

2017-09-28T17:44:48Z

PRONOM

Andariel at 15:32, 2 March 2017

2017-03-02T15:32:40Z

Jsummers: /* References */

2016-11-23T19:47:43Z

‎References

@@ Line 7: / Line 7: @@
 |wikidata={{wikidata|Q162839}}
 |compression=lossless, mandatory
-|magic=FD 37 7A 58 5A 00
+|magic=[https://github.com/file/file/blob/master/magic/Magdir/compress#L273 FD 37 7A 58 5A 00]
 |released=2009<ref>[https://tukaani.org/xz/xz-file-format-1.0.0.txt The .xz File Format - Version 1.0.0 (2009-01-14) - tukaani.org]</ref>
 }}

@@ Line 16: / Line 16: @@
 * [[initramfs]]<ref>[https://github.com/dracut-ng/dracut-ng/blob/main/man/dracut.conf.5.adoc?plain=1#L119-L123 dracut.conf.5.adoc - dracut-ng manual pages - GitHub]</ref><ref>[https://gitlab.archlinux.org/archlinux/mkinitcpio/mkinitcpio/-/blob/master/mkinitcpio.conf?ref_type=heads#L61-67 mkinitcpio.conf (lines 61-67) - mkinitcpio - Arch Linux GitLab]</ref><ref>[https://github.com/anatol/booster/blob/master/docs/manpage.md?plain=1#L57 manpage.md (line 57) - booster - GitHub]</ref>,
 * [[SquashFS|<code>squashfs-tools</code>]]<ref>[https://github.com/plougher/squashfs-tools/blob/master/squashfs-tools/compressor.c#L31-L77 compressor.c (lines 31-77) - squashfs-tools - GitHub]</ref>
 * As a specific switch <code>-J</code> or <code>--xz</code> in GNU [[tar]]<ref>[https://www.gnu.org/software/tar/manual/tar.html#gzip 8.1.1 Creating and Reading Compressed Archives - GNU tar 1.35 online manual (single page) - gnu.org]</ref>  under [[Linux]].
 == Identification ==

@@ Line 12: / Line 12: @@
 '''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|LZMA_Alone]] format, and an alternative to [[Lzip]]. The compression format is offered as an option among the likes of [[vmlinuz]]<ref>[https://github.com/torvalds/linux/blob/master/scripts/extract-vmlinux#L52 extract-vmlinux shell script (line 52) - Linus Torvalds' kernel - GitHub]</ref>, [[initramfs]]<ref>[https://github.com/dracut-ng/dracut-ng/blob/main/man/dracut.conf.5.adoc?plain=1#L119-L123 dracut.conf.5.adoc - dracut-ng manual pages - GitHub]</ref><ref>[https://gitlab.archlinux.org/archlinux/mkinitcpio/mkinitcpio/-/blob/master/mkinitcpio.conf?ref_type=heads#L61-67 mkinitcpio.conf (lines 61-67) - mkinitcpio - Arch Linux GitLab]</ref><ref>[https://github.com/anatol/booster/blob/master/docs/manpage.md?plain=1#L57 manpage.md (line 57) - booster - GitHub]</ref>, [[SquashFS|<code>squashfs-tools</code>]]<ref>[https://github.com/plougher/squashfs-tools/blob/master/squashfs-tools/compressor.c#L31-L77 compressor.c (lines 31-77) - squashfs-tools - GitHub]</ref> and finally as a specific switch <code>-J</code> or <code>--xz</code> in GNU [[tar]]<ref>[https://www.gnu.org/software/tar/manual/tar.html#gzip 8.1.1 Creating and Reading Compressed Archives - GNU tar 1.35 online manual (single page) - gnu.org]</ref>  under [[Linux]].
+XZ is a successor to [[LZMA Alone|LZMA_Alone]] format, and an alternative to [[Lzip]]. The compression format is offered as an option among the likes of:
 == Identification ==

@@ Line 12: / Line 12: @@
 '''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|LZMA_Alone]] format, and an alternative to [[Lzip]]. The compression format is offered as an option among the likes of [[vmlinuz]]<ref>[https://github.com/torvalds/linux/blob/master/scripts/extract-vmlinux#L52 extract-vmlinux shell script (line 52) - Linus Torvalds' kernel - GitHub]</ref>, [[initramfs]]<ref>[https://github.com/dracut-ng/dracut-ng/blob/main/man/dracut.conf.5.adoc?plain=1#L119-L123 dracut.conf.5.adoc - dracut-ng manual pages - GitHub]</ref><ref>[https://gitlab.archlinux.org/archlinux/mkinitcpio/mkinitcpio/-/blob/master/mkinitcpio.conf?ref_type=heads#L61-67 mkinitcpio.conf (lines 61-67) - mkinitcpio - Arch Linux GitLab]</ref><ref>[https://github.com/anatol/booster/blob/master/docs/manpage.md?plain=1#L57 manpage.md (line 57) - booster - GitHub]</ref>, [[SquashFS|<code>squashfs-tools</code>]]<ref>[https://github.com/plougher/squashfs-tools/blob/master/squashfs-tools/compressor.c#L31-L77 compressor.c (lines 31-77) - squashfs-tools - GitHub]</ref> and finally as a specific switch <code>-J</code> or <code>--xz</code> in GNU [[tar]]<ref>[https://www.gnu.org/software/tar/manual/tar.html#gzip - 8.1.1 Creating and Reading Compressed Archives - GNU tar 1.35 online manual (single page) - gnu.org]</ref>  under [[Linux]].
+XZ is a successor to [[LZMA Alone|LZMA_Alone]] format, and an alternative to [[Lzip]]. The compression format is offered as an option among the likes of [[vmlinuz]]<ref>[https://github.com/torvalds/linux/blob/master/scripts/extract-vmlinux#L52 extract-vmlinux shell script (line 52) - Linus Torvalds' kernel - GitHub]</ref>, [[initramfs]]<ref>[https://github.com/dracut-ng/dracut-ng/blob/main/man/dracut.conf.5.adoc?plain=1#L119-L123 dracut.conf.5.adoc - dracut-ng manual pages - GitHub]</ref><ref>[https://gitlab.archlinux.org/archlinux/mkinitcpio/mkinitcpio/-/blob/master/mkinitcpio.conf?ref_type=heads#L61-67 mkinitcpio.conf (lines 61-67) - mkinitcpio - Arch Linux GitLab]</ref><ref>[https://github.com/anatol/booster/blob/master/docs/manpage.md?plain=1#L57 manpage.md (line 57) - booster - GitHub]</ref>, [[SquashFS|<code>squashfs-tools</code>]]<ref>[https://github.com/plougher/squashfs-tools/blob/master/squashfs-tools/compressor.c#L31-L77 compressor.c (lines 31-77) - squashfs-tools - GitHub]</ref> and finally as a specific switch <code>-J</code> or <code>--xz</code> in GNU [[tar]]<ref>[https://www.gnu.org/software/tar/manual/tar.html#gzip 8.1.1 Creating and Reading Compressed Archives - GNU tar 1.35 online manual (single page) - gnu.org]</ref>  under [[Linux]].
 == Identification ==

@@ Line 5: / Line 5: @@
 |mimetypes={{mimetype|application/x-xz}}
 |pronom={{PRONOM|fmt/1098}}
 }}
 '''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|LZMA_Alone]] format, and an alternative to [[Lzip]].
+XZ is a successor to [[LZMA Alone|LZMA_Alone]] format, and an alternative to [[Lzip]]. The compression format is offered as an option among the likes of [[vmlinuz]]<ref>[https://github.com/torvalds/linux/blob/master/scripts/extract-vmlinux#L52 extract-vmlinux shell script (line 52) - Linus Torvalds' kernel - GitHub]</ref>, [[initramfs]]<ref>[https://github.com/dracut-ng/dracut-ng/blob/main/man/dracut.conf.5.adoc?plain=1#L119-L123 dracut.conf.5.adoc - dracut-ng manual pages - GitHub]</ref><ref>[https://gitlab.archlinux.org/archlinux/mkinitcpio/mkinitcpio/-/blob/master/mkinitcpio.conf?ref_type=heads#L61-67 mkinitcpio.conf (lines 61-67) - mkinitcpio - Arch Linux GitLab]</ref><ref>[https://github.com/anatol/booster/blob/master/docs/manpage.md?plain=1#L57 manpage.md (line 57) - booster - GitHub]</ref>, [[SquashFS|<code>squashfs-tools</code>]]<ref>[https://github.com/plougher/squashfs-tools/blob/master/squashfs-tools/compressor.c#L31-L77 compressor.c (lines 31-77) - squashfs-tools - GitHub]</ref> and finally as a specific switch <code>-J</code> or <code>--xz</code> in GNU [[tar]]<ref>[https://www.gnu.org/software/tar/manual/tar.html#gzip - 8.1.1 Creating and Reading Compressed Archives - GNU tar 1.35 online manual (single page) - gnu.org]</ref>  under [[Linux]].
 == 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.)
+XZ files always have lengths that are multiples of 4 bytes, and they begin with a 6-byte "magic" sequence of (hex) {{magic|FD 37 7A 58 5A 00}} and end with footer "magic bytes" of {{magic|59 5A}}. (The ending bytes can be verified as a sign that the file has not been truncated in transmission.)
 == Software ==
@@ Line 24: / Line 28: @@
 == Sample files ==
 * {{DexvertSamples|archive/xz}}
-== References ==
+== Links ==
-* [http://tukaani.org/xz/xz-file-format.txt Current spec]
+* [https://tukaani.org/xz/xz-file-format.txt Current spec]
-* [http://tukaani.org/xz/format.html Official site] (has historical specs with other info)
+* [https://tukaani.org/xz/format.html Official site] (has historical specs with other info)
 * [[Wikipedia:xz|Wikipedia article]]
-* [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
+* [https://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

@@ Line 21: / Line 21: @@
 ** liblzma
 * [http://tukaani.org/xz/embedded.html XZ Embedded]
 == References ==

← Older revision		Revision as of 19:47, 23 November 2016
Line 25:		Line 25:
	* [http://tukaani.org/xz/format.html Official site] (has historical specs with other info)		* [http://tukaani.org/xz/format.html Official site] (has historical specs with other info)
	* [[Wikipedia:xz\|Wikipedia article]]		* [[Wikipedia:xz\|Wikipedia article]]
		+	* [http://www.nongnu.org/lzip/xz_inadequate.html Xz format inadequate for long-term archiving] - Criticism of xz, by the author of a competing format