Annotation of /trunk/mkinitrd-magellan/klibc/usr/klibc/zlib/uncompr.c
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
File MIME type: text/plain
File size: 2134 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | niro | 532 | /* uncompr.c -- decompress a memory buffer |
2 | * Copyright (C) 1995-2003 Jean-loup Gailly. | ||
3 | * For conditions of distribution and use, see copyright notice in zlib.h | ||
4 | */ | ||
5 | |||
6 | /* @(#) $Id: uncompr.c,v 1.1 2007-09-01 22:44:22 niro Exp $ */ | ||
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 | This function can be used to decompress a whole file at once if the | ||
20 | input file is mmap'ed. | ||
21 | |||
22 | uncompress returns Z_OK if success, Z_MEM_ERROR if there was not | ||
23 | enough memory, Z_BUF_ERROR if there was not enough room in the output | ||
24 | buffer, or Z_DATA_ERROR if the input data was corrupted. | ||
25 | */ | ||
26 | int ZEXPORT uncompress (dest, destLen, source, sourceLen) | ||
27 | Bytef *dest; | ||
28 | uLongf *destLen; | ||
29 | const Bytef *source; | ||
30 | uLong sourceLen; | ||
31 | { | ||
32 | z_stream stream; | ||
33 | int err; | ||
34 | |||
35 | stream.next_in = (Bytef*)source; | ||
36 | stream.avail_in = (uInt)sourceLen; | ||
37 | /* Check for source > 64K on 16-bit machine: */ | ||
38 | if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR; | ||
39 | |||
40 | stream.next_out = dest; | ||
41 | stream.avail_out = (uInt)*destLen; | ||
42 | if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR; | ||
43 | |||
44 | stream.zalloc = (alloc_func)0; | ||
45 | stream.zfree = (free_func)0; | ||
46 | |||
47 | err = inflateInit(&stream); | ||
48 | if (err != Z_OK) return err; | ||
49 | |||
50 | err = inflate(&stream, Z_FINISH); | ||
51 | if (err != Z_STREAM_END) { | ||
52 | inflateEnd(&stream); | ||
53 | if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0)) | ||
54 | return Z_DATA_ERROR; | ||
55 | return err; | ||
56 | } | ||
57 | *destLen = stream.total_out; | ||
58 | |||
59 | err = inflateEnd(&stream); | ||
60 | return err; | ||
61 | } |