grab.h

采用zlib标准的压缩源码

/*
  *2006-02-27  hall
  *The Grab and unGrab
  * /


/************************************************************************

//ZEXTERNint Grab(uchr *DestBuffer,             /* out: Destination  buffer            */       
//                                   ulong *dwBufLenout,         /* out: length of output from Grab */
//                                   uchar *lpBuffer,                /* in: Source  Buffer                    */               
//                                   ulong *lsbufflen,               /*  in: length of input  Buffer         */    
//                                   uchar leve
//                                  ); 
//

/*

     Compresses the source buffer into the destination buffer. The level
   parameter has the same meaning as in deflateInit.  sourceLen is the byte
   length of the source buffer. Upon entry, destLen is the total size of the
   destination buffer, which must be at least 0.1% larger than sourceLen plus
   12 bytes. Upon exit, destLen is the actual size of the compressed buffer.

    Grab returns 0 if success, -4 if there was not enough
   memory, -5 if there was not enough room in the output buffer,
   -2 if the level parameter is invalid.

   
*********************************************************************/

//ZEXTERN int unGrab(uchar *lDestpBuffer,       /* out: Destination  buffer              */
//                                     ulong *dwBufLen,           /* (in/out) in:length memset  Buffer        
//                                                                             out: length of output from Grab    */                
//                                     uchar *GrabBuffer,         /* in: Source Buffer                        */                                                       
//                                     ulong *lsbufflen              /* in: length of input Buffer             */                            
//                                   );

/*
ZEXTERN int ZEXPORT uncompress OF((Bytef *dest,   uLongf *destLen,
                                   const Bytef *source, uLong sourceLen));

     Decompresses the source buffer into the destination buffer.  sourceLen is
   the byte length of the source buffer. Upon entry, destLen is the total
   size of the destination buffer, which must be large enough to hold the
   entire uncompressed data. (The size of the uncompressed data must have
   been saved previously by the compressor and transmitted to the decompressor
   by some mechanism outside the scope of this compression library.)
   Upon exit, destLen is the actual size of the compressed buffer.
     This function can be used to decompress a whole file at once if the
   input file is mmap'ed.

     uncompress returns 0 if success, -4 if there was not
   enough memory, -5 if there was not enough room in the output
   buffer, or Z_DATA_ERROR if the input data was corrupted.
   
************************************************************************/


#ifndef _GRAB_H
#define _GRAB_H

#define Z_DEFAULT_COMPRESSION (-1)




/*Compresses the source buffer into the destination buffer*/
extern int  Grab(unsigned char *DestBuffer,             /* out: Destination  buffer            */       
                  unsigned long *dwBufLenout,         /* out: length of output from Grab */
                  unsigned char *lpBuffer,                /* in: Source  Buffer                    */               
                  unsigned long lsbufflen,                 /*  in: length of input  Buffer         */    
                  int leve );
                  
/*   The compression level must be Z_DEFAULT_COMPRESSION, or between 0 and 9:
   1 gives best speed, 9 gives best compression, 0 gives no compression at
   all (the input data is simply copied a block at a time).
     Grab returns 0 if success, -4 if there was not enough memory, -5 if there
   was not enough room in the output buffer,   -2 if the level parameter is invalid.
*/ 


/*Decompresses the source buffer into the destination buffer*/
 extern int unGrab(unsigned char *lDestpBuffer,       /* out: Destination  buffer              */
                     unsigned long  *dwBufLen,          /* (in/out) in:length memset  Buffer        
                                                                           out: length of output from Grab    */                
                     unsigned char  *GrabBuffer,       /* in: Source Buffer                        */                                                       
                     unsigned long  lsbufflen  ) ;         /* in: length of input Buffer              */                            
                     

 
#endif //_GRAB_H