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uncompr.c
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1 /* uncompr.c -- decompress a memory buffer
2 * Copyright (C) 1995-2003, 2010 Jean-loup Gailly.
3 * For conditions of distribution and use, see copyright notice in zlib.h
4 */
5
6 /* @(#) $Id$ */
7
8 #define ZLIB_INTERNAL
9 #include "zlib.h"
10
11 /* ===========================================================================
12 Decompresses the source buffer into the destination buffer. sourceLen is
13 the byte length of the source buffer. Upon entry, destLen is the total
14 size of the destination buffer, which must be large enough to hold the
15 entire uncompressed data. (The size of the uncompressed data must have
16 been saved previously by the compressor and transmitted to the decompressor
17 by some mechanism outside the scope of this compression library.)
18 Upon exit, destLen is the actual size of the compressed buffer.
19
20 uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
21 enough memory, Z_BUF_ERROR if there was not enough room in the output
22 buffer, or Z_DATA_ERROR if the input data was corrupted.
23 */
24 int ZEXPORT uncompress (dest, destLen, source, sourceLen)
25 Bytef *dest;
26 uLongf *destLen;
27 const Bytef *source;
28 uLong sourceLen;
29 {
30 z_stream stream;
31 int err;
32
33 stream.next_in = (Bytef*)source;
34 stream.avail_in = (uInt)sourceLen;
35 /* Check for source > 64K on 16-bit machine: */
36 if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
37
38 stream.next_out = dest;
39 stream.avail_out = (uInt)*destLen;
40 if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
41
42 stream.zalloc = (alloc_func)0;
43 stream.zfree = (free_func)0;
44
45 err = inflateInit(&stream);
46 if (err != Z_OK) return err;
47
48 err = inflate(&stream, Z_FINISH);
49 if (err != Z_STREAM_END) {
50 inflateEnd(&stream);
51 if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
52 return Z_DATA_ERROR;
53 return err;
54 }
55 *destLen = stream.total_out;
56
57 err = inflateEnd(&stream);
58 return err;
59 }
z_stream_s::next_in
Bytef * next_in
Definition: zlib.h:86
uncompress
int ZEXPORT uncompress(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen)
Definition: uncompr.c:24
z_stream_s::avail_in
uInt avail_in
Definition: zlib.h:87
Z_NEED_DICT
#define Z_NEED_DICT
Definition: zlib.h:175
uLong
unsigned long uLong
Definition: zconf.h:336
Bytef
Byte FAR Bytef
Definition: zconf.h:342
z_stream_s::zfree
free_func zfree
Definition: zlib.h:98
zlib.h
Z_FINISH
#define Z_FINISH
Definition: zlib.h:168
Z_DATA_ERROR
#define Z_DATA_ERROR
Definition: zlib.h:178
Z_STREAM_END
#define Z_STREAM_END
Definition: zlib.h:174
z_stream_s::zalloc
alloc_func zalloc
Definition: zlib.h:97
z_stream_s::next_out
Bytef * next_out
Definition: zlib.h:90
z_stream_s::total_out
uLong total_out
Definition: zlib.h:92
uLongf
uLong FAR uLongf
Definition: zconf.h:347
Z_BUF_ERROR
#define Z_BUF_ERROR
Definition: zlib.h:180
inflateInit
#define inflateInit(strm)
Definition: zlib.h:1548
z_stream_s::avail_out
uInt avail_out
Definition: zlib.h:91
Z_OK
#define Z_OK
Definition: zlib.h:173
inflate
int ZEXPORT inflate(z_streamp strm, int flush)
Definition: inflate.c:589
const
#define const
Definition: zconf.h:196
ZEXPORT
#define ZEXPORT
Definition: zconf.h:322
inflateEnd
int ZEXPORT inflateEnd(z_streamp strm)
Definition: inflate.c:1238
z_stream_s
Definition: zlib.h:85
uInt
unsigned int uInt
Definition: zconf.h:335