LZ4
From Just Solve the File Format Problem
(Difference between revisions)
(Added DWARFS as a user of LZ4.) |
(Added link for magic bytes, only for FormatInfo. Added more "signature bytes" depending on version. Clarified which magic bytes belongs to which versions of LZ4.) |
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|wikidata={{wikidata|Q15624241}} (Compression algorithm)<br />{{wikidata|Q28770292}} (file format) | |wikidata={{wikidata|Q15624241}} (Compression algorithm)<br />{{wikidata|Q28770292}} (file format) | ||
|compression=lossless, mandatory | |compression=lossless, mandatory | ||
| − | |magic=02 21 4c 18 ( | + | |magic=[https://github.com/file/file/blob/master/magic/Magdir/compress#L304 02 21 4c 18] (v0.1-v0.9)<br />[https://github.com/file/file/blob/master/magic/Magdir/compress#L302 03 21 4c 18] (v1.0-v1.3)<br />[https://github.com/file/file/blob/master/magic/Magdir/compress#L298 04 22 4d 18] (v1.4+) |
|released=2011 | |released=2011 | ||
}} | }} | ||
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== Identification == | == Identification == | ||
| − | + | * LZ4 (v1.4+) compressed files begin with signature bytes {{magic|04 22 4d 18}}. | |
| − | + | * LZ4 (v1.0-v1.3) compressed files begin with signature bytes {{magic|03 21 4c 18}}. | |
| − | + | * LZ4 (v0.1-v0.9) compressed files begin with signature bytes {{magic|02 21 4c 18}}. | |
== Resources == | == Resources == | ||
Revision as of 11:27, 16 August 2025
LZ4 is a lossless data compression algorithm and compressed data format. It is designed to support very fast compression.
In Linux, LZ4 appears as one of the many compression format for:
- vmlinuz[1]
- initramfs[2][3][4]
-
squashfs-tools[5] - zram[6] - Compressed RAM-based block devices.
- DWARFS[7]
Identification
- LZ4 (v1.4+) compressed files begin with signature bytes
04 22 4d 18. - LZ4 (v1.0-v1.3) compressed files begin with signature bytes
03 21 4c 18. - LZ4 (v0.1-v0.9) compressed files begin with signature bytes
02 21 4c 18.
Resources
- LZ4 compression algorithm on Wikipedia
- LZ4 website
- LZ4 explained
- How LZ4 works
- Raising Lazarus - The 20 Year Old Bug that Went to Mars vs. Debunking the LZ4 "20 years old bug" myth
References
- ↑ extract-vmlinux shell script (line 56) - Linus Torvalds' kernel - GitHub
- ↑ dracut.conf.5.adoc - dracut-ng manual pages - GitHub
- ↑ mkinitcpio.conf (lines 61-67) - mkinitcpio - Arch Linux GitLab
- ↑ manpage.md (line 57) - booster - GitHub
- ↑ compressor.c (lines 31-77) - squashfs-tools - GitHub
- ↑ 2) Select compression algorithm - zram: Compressed RAM-based block devices -- The Linux Kernel documentation
- ↑ lz4.cpp - DWARFS - GitHub
