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*/
57int ZEXPORT
58uncompress(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(&stream, Z_FINISH);
79 if (err != Z_STREAM_END) {
80 inflateEnd(&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(&stream);
88 return err;
89}
90