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1 | /* uncompr.c -- decompress a memory buffer |
2 | * Copyright (C) 1995-1998 Jean-loup Gailly. | |
e6ebb514 | 3 | * For conditions of distribution and use, see copyright notice in zlib.h |
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4 | */ |
5 | ||
6 | /* @(#) $Id$ */ | |
7 | ||
1f0299c1 | 8 | #include "../zlib/zlib.h" |
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9 | |
10 | /* =========================================================================== | |
11 | Decompresses the source buffer into the destination buffer. sourceLen is | |
12 | the byte length of the source buffer. Upon entry, destLen is the total | |
13 | size of the destination buffer, which must be large enough to hold the | |
14 | entire uncompressed data. (The size of the uncompressed data must have | |
15 | been saved previously by the compressor and transmitted to the decompressor | |
16 | by some mechanism outside the scope of this compression library.) | |
17 | Upon exit, destLen is the actual size of the compressed buffer. | |
18 | This function can be used to decompress a whole file at once if the | |
19 | input file is mmap'ed. | |
20 | ||
21 | uncompress returns Z_OK if success, Z_MEM_ERROR if there was not | |
22 | enough memory, Z_BUF_ERROR if there was not enough room in the output | |
23 | buffer, or Z_DATA_ERROR if the input data was corrupted. | |
24 | */ | |
75bce3ad | 25 | #if defined(__VISAGECPP__) /* Visualage can't handle this antiquated interface */ |
e6ebb514 DW |
26 | int ZEXPORT uncompress (Bytef* dest, uLongf* destLen, const Bytef* source, uLong sourceLen) |
27 | #else | |
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28 | int ZEXPORT uncompress (dest, destLen, source, sourceLen) |
29 | Bytef *dest; | |
30 | uLongf *destLen; | |
31 | const Bytef *source; | |
32 | uLong sourceLen; | |
e6ebb514 | 33 | #endif |
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34 | { |
35 | z_stream stream; | |
36 | int err; | |
37 | ||
38 | stream.next_in = (Bytef*)source; | |
39 | stream.avail_in = (uInt)sourceLen; | |
40 | /* Check for source > 64K on 16-bit machine: */ | |
41 | if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR; | |
42 | ||
43 | stream.next_out = dest; | |
44 | stream.avail_out = (uInt)*destLen; | |
45 | if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR; | |
46 | ||
47 | stream.zalloc = (alloc_func)0; | |
48 | stream.zfree = (free_func)0; | |
49 | ||
50 | err = inflateInit(&stream); | |
51 | if (err != Z_OK) return err; | |
52 | ||
53 | err = inflate(&stream, Z_FINISH); | |
54 | if (err != Z_STREAM_END) { | |
55 | inflateEnd(&stream); | |
56 | return err == Z_OK ? Z_BUF_ERROR : err; | |
57 | } | |
58 | *destLen = stream.total_out; | |
59 | ||
60 | err = inflateEnd(&stream); | |
61 | return err; | |
62 | } |