linux/lib/decompress.c, branch v3.4-rc2

decompressors: add boot-time XZ support

2011-01-13T16:03:25Z

This implements the API defined in which is used for kernel, initramfs, and initrd decompression. This patch together with the first patch is enough for XZ-compressed initramfs and initrd; XZ-compressed kernel will need arch-specific changes. The buffering requirements described in decompress_unxz.c are stricter than with gzip, so the relevant changes should be done to the arch-specific code when adding support for XZ-compressed kernel. Similarly, the heap size in arch-specific pre-boot code may need to be increased (30 KiB is enough). The XZ decompressor needs memmove(), memeq() (memcmp() == 0), and memzero() (memset(ptr, 0, size)), which aren't available in all arch-specific pre-boot environments. I'm including simple versions in decompress_unxz.c, but a cleaner solution would naturally be nicer. Signed-off-by: Lasse Collin Cc: "H. Peter Anvin" Cc: Alain Knaff Cc: Albin Tonnerre Cc: Phillip Lougher Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

Add LZO compression support for initramfs and old-style initrd

2010-01-11T17:34:05Z

Signed-off-by: Albin Tonnerre Tested-by: Wu Zhangjin Acked-by: "H. Peter Anvin" Cc: Ingo Molnar Cc: Thomas Gleixner Tested-by: Russell King Acked-by: Russell King Cc: Ralf Baechle Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

bzip2/lzma: don't stop search at first unconfigured compression

2009-02-19T21:36:55Z

Impact: Bugfix, avoids kernels which build but panic on boot Fix a bug in decompress.c : only scanned until the first non-configured compressor (with disastrous result especially if that was gzip.) Signed-off-by: Alain Knaff Signed-off-by: H. Peter Anvin

bzip2/lzma: comprehensible error messages for missing decompressor

2009-01-12T22:34:31Z

Instead of failing to identify a compressed image with a decompressor that we don't have compiled in, identify it and fail with a comprehensible panic message. Signed-off-by: H. Peter Anvin

bzip2/lzma: centralize format detection

2009-01-08T23:14:17Z

Centralize the compression format detection to a common routine in the lib directory, and use it for both initramfs and initrd. Signed-off-by: H. Peter Anvin