1 | /* |
2 | * Copyright (c) 2008-2016 Apple Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | /* uncompr.c -- decompress a memory buffer |
29 | * Copyright (C) 1995-2003 Jean-loup Gailly. |
30 | * For conditions of distribution and use, see copyright notice in zlib.h |
31 | */ |
32 | |
33 | /* @(#) $Id$ */ |
34 | |
35 | #define ZLIB_INTERNAL |
36 | #if KERNEL |
37 | #include <libkern/zlib.h> |
38 | #else |
39 | #include "zlib.h" |
40 | #endif /* KERNEL */ |
41 | |
42 | /* =========================================================================== |
43 | Decompresses the source buffer into the destination buffer. sourceLen is |
44 | the byte length of the source buffer. Upon entry, destLen is the total |
45 | size of the destination buffer, which must be large enough to hold the |
46 | entire uncompressed data. (The size of the uncompressed data must have |
47 | been saved previously by the compressor and transmitted to the decompressor |
48 | by some mechanism outside the scope of this compression library.) |
49 | Upon exit, destLen is the actual size of the compressed buffer. |
50 | This function can be used to decompress a whole file at once if the |
51 | input file is mmap'ed. |
52 | |
53 | uncompress returns Z_OK if success, Z_MEM_ERROR if there was not |
54 | enough memory, Z_BUF_ERROR if there was not enough room in the output |
55 | buffer, or Z_DATA_ERROR if the input data was corrupted. |
56 | */ |
57 | int ZEXPORT |
58 | uncompress(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen) |
59 | { |
60 | z_stream stream; |
61 | int err; |
62 | |
63 | stream.next_in = (Bytef*)source; |
64 | stream.avail_in = (uInt)sourceLen; |
65 | /* Check for source > 64K on 16-bit machine: */ |
66 | if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR; |
67 | |
68 | stream.next_out = dest; |
69 | stream.avail_out = (uInt)*destLen; |
70 | if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR; |
71 | |
72 | stream.zalloc = (alloc_func)0; |
73 | stream.zfree = (free_func)0; |
74 | |
75 | err = inflateInit(&stream); |
76 | if (err != Z_OK) return err; |
77 | |
78 | err = inflate(strm: &stream, Z_FINISH); |
79 | if (err != Z_STREAM_END) { |
80 | inflateEnd(strm: &stream); |
81 | if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0)) |
82 | return Z_DATA_ERROR; |
83 | return err; |
84 | } |
85 | *destLen = stream.total_out; |
86 | |
87 | err = inflateEnd(strm: &stream); |
88 | return err; |
89 | } |
90 | |