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20dde48bca
Add lzop decompression support to the existing lzo bitstream handling (think gzip versus zlib), and support it for uImage decompression if CONFIG_LZO is enabled. Lzop doesn't compress as good as gzip (~10% worse), but decompression is very fast (~0.7s faster here on a slow ppc). The lzop decompression code is based on Albin Tonnerre's recent ARM Linux lzo support patch. Cc: albin.tonnerre@free-electrons.com Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
49 lines
1.4 KiB
C
49 lines
1.4 KiB
C
#ifndef __LZO_H__
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#define __LZO_H__
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/*
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* LZO Public Kernel Interface
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* A mini subset of the LZO real-time data compression library
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*
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* Copyright (C) 1996-2005 Markus F.X.J. Oberhumer <markus@oberhumer.com>
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*
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* The full LZO package can be found at:
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* http://www.oberhumer.com/opensource/lzo/
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*
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* Changed for kernel use by:
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* Nitin Gupta <nitingupta910@gmail.com>
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* Richard Purdie <rpurdie@openedhand.com>
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*/
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#define LZO1X_MEM_COMPRESS (16384 * sizeof(unsigned char *))
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#define LZO1X_1_MEM_COMPRESS LZO1X_MEM_COMPRESS
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#define lzo1x_worst_compress(x) ((x) + ((x) / 16) + 64 + 3)
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/* This requires 'workmem' of size LZO1X_1_MEM_COMPRESS */
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int lzo1x_1_compress(const unsigned char *src, size_t src_len,
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unsigned char *dst, size_t *dst_len, void *wrkmem);
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/* safe decompression with overrun testing */
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int lzo1x_decompress_safe(const unsigned char *src, size_t src_len,
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unsigned char *dst, size_t *dst_len);
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/* decompress lzop format */
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int lzop_decompress(const unsigned char *src, size_t src_len,
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unsigned char *dst, size_t *dst_len);
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/*
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* Return values (< 0 = Error)
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*/
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#define LZO_E_OK 0
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#define LZO_E_ERROR (-1)
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#define LZO_E_OUT_OF_MEMORY (-2)
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#define LZO_E_NOT_COMPRESSIBLE (-3)
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#define LZO_E_INPUT_OVERRUN (-4)
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#define LZO_E_OUTPUT_OVERRUN (-5)
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#define LZO_E_LOOKBEHIND_OVERRUN (-6)
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#define LZO_E_EOF_NOT_FOUND (-7)
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#define LZO_E_INPUT_NOT_CONSUMED (-8)
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#define LZO_E_NOT_YET_IMPLEMENTED (-9)
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#endif
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