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