include/linux/decompress/generic.h

   1 #ifndef DECOMPRESS_GENERIC_H
   2 #define DECOMPRESS_GENERIC_H
   3
   4 typedef int (*decompress_fn) (unsigned char *inbuf, long len,
   5                               long (*fill)(void*, unsigned long),
   6                               long (*flush)(void*, unsigned long),
   7                               unsigned char *outbuf,
   8                               long *posp,
   9                               void(*error)(char *x));
  10
  11 /* inbuf   - input buffer
  12  *len     - len of pre-read data in inbuf
  13  *fill    - function to fill inbuf when empty
  14  *flush   - function to write out outbuf
  15  *outbuf  - output buffer
  16  *posp    - if non-null, input position (number of bytes read) will be
  17  *        returned here
  18  *
  19  *If len != 0, inbuf should contain all the necessary input data, and fill
  20  *should be NULL
  21  *If len = 0, inbuf can be NULL, in which case the decompressor will allocate
  22  *the input buffer.  If inbuf != NULL it must be at least XXX_IOBUF_SIZE bytes.
  23  *fill will be called (repeatedly...) to read data, at most XXX_IOBUF_SIZE
  24  *bytes should be read per call.  Replace XXX with the appropriate decompressor
  25  *name, i.e. LZMA_IOBUF_SIZE.
  26  *
  27  *If flush = NULL, outbuf must be large enough to buffer all the expected
  28  *output.  If flush != NULL, the output buffer will be allocated by the
  29  *decompressor (outbuf = NULL), and the flush function will be called to
  30  *flush the output buffer at the appropriate time (decompressor and stream
  31  *dependent).
  32  */
  33
  34
  35 /* Utility routine to detect the decompression method */
  36 decompress_fn decompress_method(const unsigned char *inbuf, long len,
  37                                 const char **name);
  38
  39 #endif