70 lines
1.5 KiB
C
70 lines
1.5 KiB
C
|
|
|
|
|
|
|
|
#define ZLIB_INTERNAL
|
|
#include "zlib.h"
|
|
|
|
|
|
int ZEXPORT compress2 (dest, destLen, source, sourceLen, level)
|
|
Bytef *dest;
|
|
uLongf *destLen;
|
|
const Bytef *source;
|
|
uLong sourceLen;
|
|
int level;
|
|
{
|
|
z_stream stream;
|
|
int err;
|
|
const uInt max = (uInt)-1;
|
|
uLong left;
|
|
|
|
left = *destLen;
|
|
*destLen = 0;
|
|
|
|
stream.zalloc = (alloc_func)0;
|
|
stream.zfree = (free_func)0;
|
|
stream.opaque = (voidpf)0;
|
|
|
|
err = deflateInit(&stream, level);
|
|
if (err != Z_OK) return err;
|
|
|
|
stream.next_out = dest;
|
|
stream.avail_out = 0;
|
|
stream.next_in = (z_const Bytef *)source;
|
|
stream.avail_in = 0;
|
|
|
|
do {
|
|
if (stream.avail_out == 0) {
|
|
stream.avail_out = left > (uLong)max ? max : (uInt)left;
|
|
left -= stream.avail_out;
|
|
}
|
|
if (stream.avail_in == 0) {
|
|
stream.avail_in = sourceLen > (uLong)max ? max : (uInt)sourceLen;
|
|
sourceLen -= stream.avail_in;
|
|
}
|
|
err = deflate(&stream, sourceLen ? Z_NO_FLUSH : Z_FINISH);
|
|
} while (err == Z_OK);
|
|
|
|
*destLen = stream.total_out;
|
|
deflateEnd(&stream);
|
|
return err == Z_STREAM_END ? Z_OK : err;
|
|
}
|
|
|
|
|
|
int ZEXPORT compress (dest, destLen, source, sourceLen)
|
|
Bytef *dest;
|
|
uLongf *destLen;
|
|
const Bytef *source;
|
|
uLong sourceLen;
|
|
{
|
|
return compress2(dest, destLen, source, sourceLen, Z_DEFAULT_COMPRESSION);
|
|
}
|
|
|
|
|
|
uLong ZEXPORT compressBound (sourceLen)
|
|
uLong sourceLen;
|
|
{
|
|
return sourceLen + (sourceLen >> 12) + (sourceLen >> 14) +
|
|
(sourceLen >> 25) + 13;
|
|
}
|