J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 3 | * |
| 4 | * This code is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License version 2 only, as |
| 6 | * published by the Free Software Foundation. Sun designates this |
| 7 | * particular file as subject to the "Classpath" exception as provided |
| 8 | * by Sun in the LICENSE file that accompanied this code. |
| 9 | * |
| 10 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 13 | * version 2 for more details (a copy is included in the LICENSE file that |
| 14 | * accompanied this code). |
| 15 | * |
| 16 | * You should have received a copy of the GNU General Public License version |
| 17 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 18 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 19 | * |
| 20 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 21 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 22 | * have any questions. |
| 23 | */ |
| 24 | |
| 25 | /* |
| 26 | * This file is available under and governed by the GNU General Public |
| 27 | * License version 2 only, as published by the Free Software Foundation. |
| 28 | * However, the following notice accompanied the original version of this |
| 29 | * file and, per its terms, should not be removed: |
| 30 | * |
| 31 | * uncompr.c -- decompress a memory buffer |
| 32 | * Copyright (C) 1995-1998 Jean-loup Gailly. |
| 33 | * For conditions of distribution and use, see copyright notice in zlib.h |
| 34 | */ |
| 35 | |
| 36 | #include "zlib.h" |
| 37 | |
| 38 | /* =========================================================================== |
| 39 | Decompresses the source buffer into the destination buffer. sourceLen is |
| 40 | the byte length of the source buffer. Upon entry, destLen is the total |
| 41 | size of the destination buffer, which must be large enough to hold the |
| 42 | entire uncompressed data. (The size of the uncompressed data must have |
| 43 | been saved previously by the compressor and transmitted to the decompressor |
| 44 | by some mechanism outside the scope of this compression library.) |
| 45 | Upon exit, destLen is the actual size of the compressed buffer. |
| 46 | This function can be used to decompress a whole file at once if the |
| 47 | input file is mmap'ed. |
| 48 | |
| 49 | uncompress returns Z_OK if success, Z_MEM_ERROR if there was not |
| 50 | enough memory, Z_BUF_ERROR if there was not enough room in the output |
| 51 | buffer, or Z_DATA_ERROR if the input data was corrupted. |
| 52 | */ |
| 53 | int ZEXPORT uncompress (dest, destLen, source, sourceLen) |
| 54 | Bytef *dest; |
| 55 | uLongf *destLen; |
| 56 | const Bytef *source; |
| 57 | uLong sourceLen; |
| 58 | { |
| 59 | z_stream stream; |
| 60 | int err; |
| 61 | |
| 62 | stream.next_in = (Bytef*)source; |
| 63 | stream.avail_in = (uInt)sourceLen; |
| 64 | /* Check for source > 64K on 16-bit machine: */ |
| 65 | if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR; |
| 66 | |
| 67 | stream.next_out = dest; |
| 68 | stream.avail_out = (uInt)*destLen; |
| 69 | if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR; |
| 70 | |
| 71 | stream.zalloc = (alloc_func)0; |
| 72 | stream.zfree = (free_func)0; |
| 73 | |
| 74 | err = inflateInit(&stream); |
| 75 | if (err != Z_OK) return err; |
| 76 | |
| 77 | err = inflate(&stream, Z_FINISH); |
| 78 | if (err != Z_STREAM_END) { |
| 79 | inflateEnd(&stream); |
| 80 | return err == Z_OK ? Z_BUF_ERROR : err; |
| 81 | } |
| 82 | *destLen = stream.total_out; |
| 83 | |
| 84 | err = inflateEnd(&stream); |
| 85 | return err; |
| 86 | } |