| rev |
line source |
|
nuclear@0
|
1 /* uncompr.c -- decompress a memory buffer
|
|
nuclear@0
|
2 * Copyright (C) 1995-2003 Jean-loup Gailly.
|
|
nuclear@0
|
3 * For conditions of distribution and use, see copyright notice in zlib.h
|
|
nuclear@0
|
4 */
|
|
nuclear@0
|
5
|
|
nuclear@0
|
6 /* @(#) $Id$ */
|
|
nuclear@0
|
7
|
|
nuclear@0
|
8 #define ZLIB_INTERNAL
|
|
nuclear@0
|
9 #include "zlib.h"
|
|
nuclear@0
|
10
|
|
nuclear@0
|
11 /* ===========================================================================
|
|
nuclear@0
|
12 Decompresses the source buffer into the destination buffer. sourceLen is
|
|
nuclear@0
|
13 the byte length of the source buffer. Upon entry, destLen is the total
|
|
nuclear@0
|
14 size of the destination buffer, which must be large enough to hold the
|
|
nuclear@0
|
15 entire uncompressed data. (The size of the uncompressed data must have
|
|
nuclear@0
|
16 been saved previously by the compressor and transmitted to the decompressor
|
|
nuclear@0
|
17 by some mechanism outside the scope of this compression library.)
|
|
nuclear@0
|
18 Upon exit, destLen is the actual size of the compressed buffer.
|
|
nuclear@0
|
19 This function can be used to decompress a whole file at once if the
|
|
nuclear@0
|
20 input file is mmap'ed.
|
|
nuclear@0
|
21
|
|
nuclear@0
|
22 uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
|
|
nuclear@0
|
23 enough memory, Z_BUF_ERROR if there was not enough room in the output
|
|
nuclear@0
|
24 buffer, or Z_DATA_ERROR if the input data was corrupted.
|
|
nuclear@0
|
25 */
|
|
nuclear@0
|
26 int ZEXPORT uncompress (dest, destLen, source, sourceLen)
|
|
nuclear@0
|
27 Bytef *dest;
|
|
nuclear@0
|
28 uLongf *destLen;
|
|
nuclear@0
|
29 const Bytef *source;
|
|
nuclear@0
|
30 uLong sourceLen;
|
|
nuclear@0
|
31 {
|
|
nuclear@0
|
32 z_stream stream;
|
|
nuclear@0
|
33 int err;
|
|
nuclear@0
|
34
|
|
nuclear@0
|
35 stream.next_in = (Bytef*)source;
|
|
nuclear@0
|
36 stream.avail_in = (uInt)sourceLen;
|
|
nuclear@0
|
37 /* Check for source > 64K on 16-bit machine: */
|
|
nuclear@0
|
38 if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
|
|
nuclear@0
|
39
|
|
nuclear@0
|
40 stream.next_out = dest;
|
|
nuclear@0
|
41 stream.avail_out = (uInt)*destLen;
|
|
nuclear@0
|
42 if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
|
|
nuclear@0
|
43
|
|
nuclear@0
|
44 stream.zalloc = (alloc_func)0;
|
|
nuclear@0
|
45 stream.zfree = (free_func)0;
|
|
nuclear@0
|
46
|
|
nuclear@0
|
47 err = inflateInit(&stream);
|
|
nuclear@0
|
48 if (err != Z_OK) return err;
|
|
nuclear@0
|
49
|
|
nuclear@0
|
50 err = inflate(&stream, Z_FINISH);
|
|
nuclear@0
|
51 if (err != Z_STREAM_END) {
|
|
nuclear@0
|
52 inflateEnd(&stream);
|
|
nuclear@0
|
53 if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
|
|
nuclear@0
|
54 return Z_DATA_ERROR;
|
|
nuclear@0
|
55 return err;
|
|
nuclear@0
|
56 }
|
|
nuclear@0
|
57 *destLen = stream.total_out;
|
|
nuclear@0
|
58
|
|
nuclear@0
|
59 err = inflateEnd(&stream);
|
|
nuclear@0
|
60 return err;
|
|
nuclear@0
|
61 }
|
