LZ4
From Just Solve the File Format Problem
(Difference between revisions)
(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.) |
m (→Resources: updated link for 'Debunking the LZ4 "20 years old bug" myth' to Internet Archive copy, as the blog entry no longer exists.) |
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* [https://fastcompression.blogspot.com/2011/05/lz4-explained.html LZ4 explained] | * [https://fastcompression.blogspot.com/2011/05/lz4-explained.html LZ4 explained] | ||
* [https://ticki.github.io/blog/how-lz4-works/ How LZ4 works] | * [https://ticki.github.io/blog/how-lz4-works/ How LZ4 works] | ||
| − | * [http://blog.securitymouse.com/2014/06/raising-lazarus-20-year-old-bug-that.html Raising Lazarus - The 20 Year Old Bug that Went to Mars] vs. [http://fastcompression.blogspot.com/2014/06/debunking-lz4-20-years-old-bug-myth.html Debunking the LZ4 "20 years old bug" myth] | + | * [http://blog.securitymouse.com/2014/06/raising-lazarus-20-year-old-bug-that.html Raising Lazarus - The 20 Year Old Bug that Went to Mars] vs. [https://web.archive.org/web/20140627022047/http://fastcompression.blogspot.com/2014/06/debunking-lz4-20-years-old-bug-myth.html Debunking the LZ4 "20 years old bug" myth - Internet Archive copy] |
== References == | == References == | ||
<references/> | <references/> | ||
Latest revision as of 11:32, 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]
[edit] 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.
[edit] 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 - Internet Archive copy
[edit] 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
