include/linux/decompress/generic.h

   1 #ifndef DECOMPRESS_GENERIC_H
   2 #define DECOMPRESS_GENERIC_H
   3
   4 /* Minimal chunksize to be read.
   5  *Bzip2 prefers at least 4096
   6  *Lzma prefers 0x10000 */
   7 #define COMPR_IOBUF_SIZE        4096
   8
   9 typedef int (*decompress_fn) (unsigned char *inbuf, int len,
  10                               int(*fill)(void*, unsigned int),
  11                               int(*writebb)(void*, unsigned int),
  12                               unsigned char *output,
  13                               int *posp,
  14                               void(*error)(char *x));
  15
  16 /* inbuf   - input buffer
  17  *len     - len of pre-read data in inbuf
  18  *fill    - function to fill inbuf if empty
  19  *writebb - function to write out outbug
  20  *posp    - if non-null, input position (number of bytes read) will be
  21  *        returned here
  22  *
  23  *If len != 0, the inbuf is initialized (with as much data), and fill
  24  *should not be called
  25  *If len = 0, the inbuf is allocated, but empty. Its size is IOBUF_SIZE
  26  *fill should be called (repeatedly...) to read data, at most IOBUF_SIZE
  27  */
  28
  29 /* Utility routine to detect the decompression method */
  30 decompress_fn decompress_method(const unsigned char *inbuf, int len,
  31                                 const char **name);
  32
  33 #endif