include/linux/lzo.h

   1 #ifndef __LZO_H__
   2 #define __LZO_H__
   3 /*
   4  *  LZO Public Kernel Interface
   5  *  A mini subset of the LZO real-time data compression library
   6  *
   7  *  Copyright (C) 1996-2005 Markus F.X.J. Oberhumer <markus@oberhumer.com>
   8  *
   9  *  The full LZO package can be found at:
  10  *  http://www.oberhumer.com/opensource/lzo/
  11  *
  12  *  Changed for kernel use by:
  13  *  Nitin Gupta <nitingupta910@gmail.com>
  14  *  Richard Purdie <rpurdie@openedhand.com>
  15  */
  16
  17 #define LZO1X_MEM_COMPRESS      (16384 * sizeof(unsigned char *))
  18 #define LZO1X_1_MEM_COMPRESS    LZO1X_MEM_COMPRESS
  19
  20 #define lzo1x_worst_compress(x) ((x) + ((x) / 16) + 64 + 3)
  21
  22 /* This requires 'workmem' of size LZO1X_1_MEM_COMPRESS */
  23 int lzo1x_1_compress(const unsigned char *src, size_t src_len,
  24                         unsigned char *dst, size_t *dst_len, void *wrkmem);
  25
  26 /* safe decompression with overrun testing */
  27 int lzo1x_decompress_safe(const unsigned char *src, size_t src_len,
  28                         unsigned char *dst, size_t *dst_len);
  29
  30 /* decompress lzop format */
  31 int lzop_decompress(const unsigned char *src, size_t src_len,
  32                     unsigned char *dst, size_t *dst_len);
  33
  34 /*
  35  * Return values (< 0 = Error)
  36  */
  37 #define LZO_E_OK                        0
  38 #define LZO_E_ERROR                     (-1)
  39 #define LZO_E_OUT_OF_MEMORY             (-2)
  40 #define LZO_E_NOT_COMPRESSIBLE          (-3)
  41 #define LZO_E_INPUT_OVERRUN             (-4)
  42 #define LZO_E_OUTPUT_OVERRUN            (-5)
  43 #define LZO_E_LOOKBEHIND_OVERRUN        (-6)
  44 #define LZO_E_EOF_NOT_FOUND             (-7)
  45 #define LZO_E_INPUT_NOT_CONSUMED        (-8)
  46 #define LZO_E_NOT_YET_IMPLEMENTED       (-9)
  47
  48 #endif