1*43a90889SApple OSS Distributions /*
2*43a90889SApple OSS Distributions * Copyright (c) 2008-2016 Apple Inc. All rights reserved.
3*43a90889SApple OSS Distributions *
4*43a90889SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
5*43a90889SApple OSS Distributions *
6*43a90889SApple OSS Distributions * This file contains Original Code and/or Modifications of Original Code
7*43a90889SApple OSS Distributions * as defined in and that are subject to the Apple Public Source License
8*43a90889SApple OSS Distributions * Version 2.0 (the 'License'). You may not use this file except in
9*43a90889SApple OSS Distributions * compliance with the License. The rights granted to you under the License
10*43a90889SApple OSS Distributions * may not be used to create, or enable the creation or redistribution of,
11*43a90889SApple OSS Distributions * unlawful or unlicensed copies of an Apple operating system, or to
12*43a90889SApple OSS Distributions * circumvent, violate, or enable the circumvention or violation of, any
13*43a90889SApple OSS Distributions * terms of an Apple operating system software license agreement.
14*43a90889SApple OSS Distributions *
15*43a90889SApple OSS Distributions * Please obtain a copy of the License at
16*43a90889SApple OSS Distributions * http://www.opensource.apple.com/apsl/ and read it before using this file.
17*43a90889SApple OSS Distributions *
18*43a90889SApple OSS Distributions * The Original Code and all software distributed under the License are
19*43a90889SApple OSS Distributions * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
20*43a90889SApple OSS Distributions * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
21*43a90889SApple OSS Distributions * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
22*43a90889SApple OSS Distributions * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
23*43a90889SApple OSS Distributions * Please see the License for the specific language governing rights and
24*43a90889SApple OSS Distributions * limitations under the License.
25*43a90889SApple OSS Distributions *
26*43a90889SApple OSS Distributions * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
27*43a90889SApple OSS Distributions */
28*43a90889SApple OSS Distributions /* uncompr.c -- decompress a memory buffer
29*43a90889SApple OSS Distributions * Copyright (C) 1995-2003 Jean-loup Gailly.
30*43a90889SApple OSS Distributions * For conditions of distribution and use, see copyright notice in zlib.h
31*43a90889SApple OSS Distributions */
32*43a90889SApple OSS Distributions
33*43a90889SApple OSS Distributions /* @(#) $Id$ */
34*43a90889SApple OSS Distributions
35*43a90889SApple OSS Distributions #define ZLIB_INTERNAL
36*43a90889SApple OSS Distributions #if KERNEL
37*43a90889SApple OSS Distributions #include <libkern/zlib.h>
38*43a90889SApple OSS Distributions #else
39*43a90889SApple OSS Distributions #include "zlib.h"
40*43a90889SApple OSS Distributions #endif /* KERNEL */
41*43a90889SApple OSS Distributions
42*43a90889SApple OSS Distributions /* ===========================================================================
43*43a90889SApple OSS Distributions Decompresses the source buffer into the destination buffer. sourceLen is
44*43a90889SApple OSS Distributions the byte length of the source buffer. Upon entry, destLen is the total
45*43a90889SApple OSS Distributions size of the destination buffer, which must be large enough to hold the
46*43a90889SApple OSS Distributions entire uncompressed data. (The size of the uncompressed data must have
47*43a90889SApple OSS Distributions been saved previously by the compressor and transmitted to the decompressor
48*43a90889SApple OSS Distributions by some mechanism outside the scope of this compression library.)
49*43a90889SApple OSS Distributions Upon exit, destLen is the actual size of the compressed buffer.
50*43a90889SApple OSS Distributions This function can be used to decompress a whole file at once if the
51*43a90889SApple OSS Distributions input file is mmap'ed.
52*43a90889SApple OSS Distributions
53*43a90889SApple OSS Distributions uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
54*43a90889SApple OSS Distributions enough memory, Z_BUF_ERROR if there was not enough room in the output
55*43a90889SApple OSS Distributions buffer, or Z_DATA_ERROR if the input data was corrupted.
56*43a90889SApple OSS Distributions */
57*43a90889SApple OSS Distributions int ZEXPORT
uncompress(Bytef * dest,uLongf * destLen,const Bytef * source,uLong sourceLen)58*43a90889SApple OSS Distributions uncompress(Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen)
59*43a90889SApple OSS Distributions {
60*43a90889SApple OSS Distributions z_stream stream;
61*43a90889SApple OSS Distributions int err;
62*43a90889SApple OSS Distributions
63*43a90889SApple OSS Distributions stream.next_in = (Bytef*)source;
64*43a90889SApple OSS Distributions stream.avail_in = (uInt)sourceLen;
65*43a90889SApple OSS Distributions /* Check for source > 64K on 16-bit machine: */
66*43a90889SApple OSS Distributions if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
67*43a90889SApple OSS Distributions
68*43a90889SApple OSS Distributions stream.next_out = dest;
69*43a90889SApple OSS Distributions stream.avail_out = (uInt)*destLen;
70*43a90889SApple OSS Distributions if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
71*43a90889SApple OSS Distributions
72*43a90889SApple OSS Distributions stream.zalloc = (alloc_func)0;
73*43a90889SApple OSS Distributions stream.zfree = (free_func)0;
74*43a90889SApple OSS Distributions
75*43a90889SApple OSS Distributions err = inflateInit(&stream);
76*43a90889SApple OSS Distributions if (err != Z_OK) return err;
77*43a90889SApple OSS Distributions
78*43a90889SApple OSS Distributions err = inflate(&stream, Z_FINISH);
79*43a90889SApple OSS Distributions if (err != Z_STREAM_END) {
80*43a90889SApple OSS Distributions inflateEnd(&stream);
81*43a90889SApple OSS Distributions if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
82*43a90889SApple OSS Distributions return Z_DATA_ERROR;
83*43a90889SApple OSS Distributions return err;
84*43a90889SApple OSS Distributions }
85*43a90889SApple OSS Distributions *destLen = stream.total_out;
86*43a90889SApple OSS Distributions
87*43a90889SApple OSS Distributions err = inflateEnd(&stream);
88*43a90889SApple OSS Distributions return err;
89*43a90889SApple OSS Distributions }
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