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| author | Stefan Roese <sr@denx.de> | 2009-03-19 15:34:56 +0100 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2009-03-20 22:39:15 +0100 |
| commit | b1b4e89a0f3b75854c39a62cae41bad56d210adf (patch) | |
| tree | 460e7663f9d619596f29768e7296872e6dcf3001 /include/linux/lzo.h | |
| parent | 68d7d65100e84df00bca971c114092731b441090 (diff) | |
| download | u-boot-imx-b1b4e89a0f3b75854c39a62cae41bad56d210adf.zip u-boot-imx-b1b4e89a0f3b75854c39a62cae41bad56d210adf.tar.gz u-boot-imx-b1b4e89a0f3b75854c39a62cae41bad56d210adf.tar.bz2 | |
Add LZO decompressor support
This patch adds LZO decompression support to U-Boot. It is needed for
the upcoming UBIFS support, since UBIFS uses LZO as default compressor/
decompressor. Since we only support read-only in UBIFS, only the
decompressor is needed.
All this is copied with minor changes from the current Linux kernel
version (2.6.28-rc8).
This patch only implements this LZO decompressor support for PPC.
Other platforms using UBIFS will have to add the required
"include/asm/unaligned.h" as well. It should be fairly easy to copy this
from the Linux source tree as I have done it for PPC in this patch.
Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'include/linux/lzo.h')
| -rw-r--r-- | include/linux/lzo.h | 44 |
1 files changed, 44 insertions, 0 deletions
diff --git a/include/linux/lzo.h b/include/linux/lzo.h new file mode 100644 index 0000000..d793497 --- /dev/null +++ b/include/linux/lzo.h @@ -0,0 +1,44 @@ +#ifndef __LZO_H__ +#define __LZO_H__ +/* + * LZO Public Kernel Interface + * A mini subset of the LZO real-time data compression library + * + * Copyright (C) 1996-2005 Markus F.X.J. Oberhumer <markus@oberhumer.com> + * + * The full LZO package can be found at: + * http://www.oberhumer.com/opensource/lzo/ + * + * Changed for kernel use by: + * Nitin Gupta <nitingupta910@gmail.com> + * Richard Purdie <rpurdie@openedhand.com> + */ + +#define LZO1X_MEM_COMPRESS (16384 * sizeof(unsigned char *)) +#define LZO1X_1_MEM_COMPRESS LZO1X_MEM_COMPRESS + +#define lzo1x_worst_compress(x) ((x) + ((x) / 16) + 64 + 3) + +/* This requires 'workmem' of size LZO1X_1_MEM_COMPRESS */ +int lzo1x_1_compress(const unsigned char *src, size_t src_len, + unsigned char *dst, size_t *dst_len, void *wrkmem); + +/* safe decompression with overrun testing */ +int lzo1x_decompress_safe(const unsigned char *src, size_t src_len, + unsigned char *dst, size_t *dst_len); + +/* + * Return values (< 0 = Error) + */ +#define LZO_E_OK 0 +#define LZO_E_ERROR (-1) +#define LZO_E_OUT_OF_MEMORY (-2) +#define LZO_E_NOT_COMPRESSIBLE (-3) +#define LZO_E_INPUT_OVERRUN (-4) +#define LZO_E_OUTPUT_OVERRUN (-5) +#define LZO_E_LOOKBEHIND_OVERRUN (-6) +#define LZO_E_EOF_NOT_FOUND (-7) +#define LZO_E_INPUT_NOT_CONSUMED (-8) +#define LZO_E_NOT_YET_IMPLEMENTED (-9) + +#endif |