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Rev | Author | Line No. | Line |
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107 | pj | 1 | /* uncompr.c -- decompress a memory buffer |
2 | * Copyright (C) 1995-2002 Jean-loup Gailly. |
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3 | * For conditions of distribution and use, see copyright notice in zlib.h |
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4 | */ |
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5 | |||
6 | /* @(#) $Id: uncompr.c,v 1.1 2003-03-24 11:13:45 pj Exp $ */ |
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7 | |||
8 | #include "zlib.h" |
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9 | |||
10 | /* =========================================================================== |
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11 | Decompresses the source buffer into the destination buffer. sourceLen is |
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12 | the byte length of the source buffer. Upon entry, destLen is the total |
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13 | size of the destination buffer, which must be large enough to hold the |
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14 | entire uncompressed data. (The size of the uncompressed data must have |
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15 | been saved previously by the compressor and transmitted to the decompressor |
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16 | by some mechanism outside the scope of this compression library.) |
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17 | Upon exit, destLen is the actual size of the compressed buffer. |
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18 | This function can be used to decompress a whole file at once if the |
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19 | input file is mmap'ed. |
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20 | |||
21 | uncompress returns Z_OK if success, Z_MEM_ERROR if there was not |
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22 | enough memory, Z_BUF_ERROR if there was not enough room in the output |
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23 | buffer, or Z_DATA_ERROR if the input data was corrupted. |
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24 | */ |
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25 | int ZEXPORT uncompress (dest, destLen, source, sourceLen) |
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26 | Bytef *dest; |
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27 | uLongf *destLen; |
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28 | const Bytef *source; |
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29 | uLong sourceLen; |
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30 | { |
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31 | z_stream stream; |
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32 | int err; |
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33 | |||
34 | stream.next_in = (Bytef*)source; |
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35 | stream.avail_in = (uInt)sourceLen; |
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36 | /* Check for source > 64K on 16-bit machine: */ |
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37 | if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR; |
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38 | |||
39 | stream.next_out = dest; |
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40 | stream.avail_out = (uInt)*destLen; |
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41 | if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR; |
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42 | |||
43 | stream.zalloc = (alloc_func)0; |
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44 | stream.zfree = (free_func)0; |
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45 | |||
46 | err = inflateInit(&stream); |
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47 | if (err != Z_OK) return err; |
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48 | |||
49 | err = inflate(&stream, Z_FINISH); |
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50 | if (err != Z_STREAM_END) { |
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51 | inflateEnd(&stream); |
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52 | return err == Z_OK ? Z_BUF_ERROR : err; |
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53 | } |
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54 | *destLen = stream.total_out; |
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55 | |||
56 | err = inflateEnd(&stream); |
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57 | return err; |
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58 | } |