mirror of
git://gcc.gnu.org/git/gcc.git
synced 2024-12-30 17:25:11 +08:00
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/* uncompr.c -- decompress a memory buffer
|
|
* Copyright (C) 1995-1998 Jean-loup Gailly.
|
|
* For conditions of distribution and use, see copyright notice in zlib.h
|
|
*/
|
|
|
|
/* @(#) $Id$ */
|
|
|
|
#include "zlib.h"
|
|
|
|
/* ===========================================================================
|
|
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 Z_OK if success, Z_MEM_ERROR if there was not
|
|
enough memory, Z_BUF_ERROR if there was not enough room in the output
|
|
buffer, or Z_DATA_ERROR if the input data was corrupted.
|
|
*/
|
|
int ZEXPORT uncompress (dest, destLen, source, sourceLen)
|
|
Bytef *dest;
|
|
uLongf *destLen;
|
|
const Bytef *source;
|
|
uLong sourceLen;
|
|
{
|
|
z_stream stream;
|
|
int err;
|
|
|
|
stream.next_in = (Bytef*)source;
|
|
stream.avail_in = (uInt)sourceLen;
|
|
/* Check for source > 64K on 16-bit machine: */
|
|
if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
|
|
|
|
stream.next_out = dest;
|
|
stream.avail_out = (uInt)*destLen;
|
|
if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
|
|
|
|
stream.zalloc = (alloc_func)0;
|
|
stream.zfree = (free_func)0;
|
|
|
|
err = inflateInit(&stream);
|
|
if (err != Z_OK) return err;
|
|
|
|
err = inflate(&stream, Z_FINISH);
|
|
if (err != Z_STREAM_END) {
|
|
inflateEnd(&stream);
|
|
return err == Z_OK ? Z_BUF_ERROR : err;
|
|
}
|
|
*destLen = stream.total_out;
|
|
|
|
err = inflateEnd(&stream);
|
|
return err;
|
|
}
|