]> git.baikalelectronics.ru Git - kernel.git/commit
decompressors: add XZ decompressor module
authorLasse Collin <lasse.collin@tukaani.org>
Thu, 13 Jan 2011 01:01:22 +0000 (17:01 -0800)
committerLinus Torvalds <torvalds@linux-foundation.org>
Thu, 13 Jan 2011 16:03:24 +0000 (08:03 -0800)
commitcb43d45e6fa86305b09c49b791124d70fb671d06
tree06adb32802cf8a3491dff1f4e5cad464c676040a
parentd2e8123e8116b9f1b5b6ff1bab0f5fd5255d0c8e
decompressors: add XZ decompressor module

In userspace, the .lzma format has become mostly a legacy file format that
got superseded by the .xz format.  Similarly, LZMA Utils was superseded by
XZ Utils.

These patches add support for XZ decompression into the kernel.  Most of
the code is as is from XZ Embedded <http://tukaani.org/xz/embedded.html>.
It was written for the Linux kernel but is usable in other projects too.

Advantages of XZ over the current LZMA code in the kernel:
  - Nice API that can be used by other kernel modules; it's
    not limited to kernel, initramfs, and initrd decompression.
  - Integrity check support (CRC32)
  - BCJ filters improve compression of executable code on
    certain architectures. These together with LZMA2 can
    produce a few percent smaller kernel or Squashfs images
    than plain LZMA without making the decompression slower.

This patch: Add the main decompression code (xz_dec), testing module
(xz_dec_test), wrapper script (xz_wrap.sh) for the xz command line tool,
and documentation.  The xz_dec module is enough to have a usable XZ
decompressor e.g.  for Squashfs.

Signed-off-by: Lasse Collin <lasse.collin@tukaani.org>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Alain Knaff <alain@knaff.lu>
Cc: Albin Tonnerre <albin.tonnerre@free-electrons.com>
Cc: Phillip Lougher <phillip@lougher.demon.co.uk>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
17 files changed:
Documentation/xz.txt [new file with mode: 0644]
include/linux/xz.h [new file with mode: 0644]
lib/Kconfig
lib/Makefile
lib/xz/Kconfig [new file with mode: 0644]
lib/xz/Makefile [new file with mode: 0644]
lib/xz/xz_crc32.c [new file with mode: 0644]
lib/xz/xz_dec_bcj.c [new file with mode: 0644]
lib/xz/xz_dec_lzma2.c [new file with mode: 0644]
lib/xz/xz_dec_stream.c [new file with mode: 0644]
lib/xz/xz_dec_syms.c [new file with mode: 0644]
lib/xz/xz_dec_test.c [new file with mode: 0644]
lib/xz/xz_lzma2.h [new file with mode: 0644]
lib/xz/xz_private.h [new file with mode: 0644]
lib/xz/xz_stream.h [new file with mode: 0644]
scripts/Makefile.lib
scripts/xz_wrap.sh [new file with mode: 0644]