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1 /* uncompr.c -- decompress a memory buffer
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2 * Copyright (C) 1995-2003 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
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6 /* @(#) $Id$ */
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7
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8 #define ZLIB_INTERNAL
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9 #include "zlib.h"
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10
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11 /* ===========================================================================
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12 Decompresses the source buffer into the destination buffer. sourceLen is
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13 the byte length of the source buffer. Upon entry, destLen is the total
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14 size of the destination buffer, which must be large enough to hold the
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15 entire uncompressed data. (The size of the uncompressed data must have
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16 been saved previously by the compressor and transmitted to the decompressor
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17 by some mechanism outside the scope of this compression library.)
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18 Upon exit, destLen is the actual size of the compressed buffer.
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19 This function can be used to decompress a whole file at once if the
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20 input file is mmap'ed.
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21
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22 uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
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23 enough memory, Z_BUF_ERROR if there was not enough room in the output
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24 buffer, or Z_DATA_ERROR if the input data was corrupted.
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25 */
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26 int ZEXPORT uncompress (dest, destLen, source, sourceLen)
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27 Bytef *dest;
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28 uLongf *destLen;
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29 const Bytef *source;
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30 uLong sourceLen;
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31 {
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32 z_stream stream;
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33 int err;
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34
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35 stream.next_in = (Bytef*)source;
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36 stream.avail_in = (uInt)sourceLen;
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37 /* Check for source > 64K on 16-bit machine: */
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38 if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
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39
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40 stream.next_out = dest;
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41 stream.avail_out = (uInt)*destLen;
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42 if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
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43
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44 stream.zalloc = (alloc_func)0;
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45 stream.zfree = (free_func)0;
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46
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47 err = inflateInit(&stream);
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48 if (err != Z_OK) return err;
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49
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50 err = inflate(&stream, Z_FINISH);
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51 if (err != Z_STREAM_END) {
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52 inflateEnd(&stream);
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53 if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
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54 return Z_DATA_ERROR;
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55 return err;
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56 }
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57 *destLen = stream.total_out;
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58
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59 err = inflateEnd(&stream);
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60 return err;
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61 }
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