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kernel/linux-imx6_3.14.28/include/linux/decompress/generic.h 1.44 KB
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  #ifndef DECOMPRESS_GENERIC_H
  #define DECOMPRESS_GENERIC_H
  
  typedef int (*decompress_fn) (unsigned char *inbuf, int len,
  			      int(*fill)(void*, unsigned int),
  			      int(*flush)(void*, unsigned int),
  			      unsigned char *outbuf,
  			      int *posp,
  			      void(*error)(char *x));
  
  /* inbuf   - input buffer
   *len     - len of pre-read data in inbuf
   *fill    - function to fill inbuf when empty
   *flush   - function to write out outbuf
   *outbuf  - output buffer
   *posp    - if non-null, input position (number of bytes read) will be
   *	  returned here
   *
   *If len != 0, inbuf should contain all the necessary input data, and fill
   *should be NULL
   *If len = 0, inbuf can be NULL, in which case the decompressor will allocate
   *the input buffer.  If inbuf != NULL it must be at least XXX_IOBUF_SIZE bytes.
   *fill will be called (repeatedly...) to read data, at most XXX_IOBUF_SIZE
   *bytes should be read per call.  Replace XXX with the appropriate decompressor
   *name, i.e. LZMA_IOBUF_SIZE.
   *
   *If flush = NULL, outbuf must be large enough to buffer all the expected
   *output.  If flush != NULL, the output buffer will be allocated by the
   *decompressor (outbuf = NULL), and the flush function will be called to
   *flush the output buffer at the appropriate time (decompressor and stream
   *dependent).
   */
  
  
  /* Utility routine to detect the decompression method */
  decompress_fn decompress_method(const unsigned char *inbuf, int len,
  				const char **name);
  
  #endif