compress.cc File Reference

#include "zlib.h"

Go to the source code of this file.

Defines

#define ZLIB_INTERNAL

Functions

int ZEXPORT compress2 (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen, int level)
int ZEXPORT compress (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen)
uLong ZEXPORT compressBound (uLong sourceLen)


Define Documentation

#define ZLIB_INTERNAL

Definition at line 8 of file compress.cc.


Function Documentation

int ZEXPORT compress ( Bytef *  dest,
uLongf *  destLen,
const Bytef *  source,
uLong  sourceLen 
)

Definition at line 57 of file compress.cc.

References compress2().

00058 {
00059     return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
00060 }

int ZEXPORT compress2 ( Bytef *  dest,
uLongf *  destLen,
const Bytef *  source,
uLong  sourceLen,
int  level 
)

Definition at line 22 of file compress.cc.

References deflate(), and deflateEnd().

Referenced by compress().

00023 {
00024     z_stream stream;
00025     int err;
00026 
00027     stream.next_in = (Bytef*)source;
00028     stream.avail_in = (uInt)sourceLen;
00029 #ifdef MAXSEG_64K
00030     /* Check for source > 64K on 16-bit machine: */
00031     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
00032 #endif
00033     stream.next_out = dest;
00034     stream.avail_out = (uInt)*destLen;
00035     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
00036 
00037     stream.zalloc = (alloc_func)0;
00038     stream.zfree = (free_func)0;
00039     stream.opaque = (voidpf)0;
00040 
00041     err = deflateInit(&stream, level);
00042     if (err != Z_OK) return err;
00043 
00044     err = deflate(&stream, Z_FINISH);
00045     if (err != Z_STREAM_END) {
00046         deflateEnd(&stream);
00047         return err == Z_OK ? Z_BUF_ERROR : err;
00048     }
00049     *destLen = stream.total_out;
00050 
00051     err = deflateEnd(&stream);
00052     return err;
00053 }

uLong ZEXPORT compressBound ( uLong  sourceLen  ) 

Definition at line 66 of file compress.cc.

Referenced by deflateBound().

00067 {
00068     return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) + 11;
00069 }


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