grab.c

采用zlib标准的压缩源码

#include"zlib.h"
#include"Grab.h"

 typedef void * LPVOID;
 typedef unsigned char BYTE;
 typedef  BYTE *LPBYTE;
 typedef  unsigned long int DWORD;

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.
*/ 
{
   return  compress2 (DestBuffer,dwBufLenout,lpBuffer, lsbufflen,leve);
}


/*Decompresses the source buffer into the destination buffer*/
 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              */                            
                     
{
   return  uncompress (lDestpBuffer,   dwBufLen, GrabBuffer, lsbufflen);
}