0,0 → 1,59 |
/* uncompr.c -- decompress a memory buffer |
* Copyright (C) 1995-2003, 2010 Jean-loup Gailly. |
* For conditions of distribution and use, see copyright notice in zlib.h |
*/ |
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/* @(#) $Id$ */ |
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#define ZLIB_INTERNAL |
#include "zlib.h" |
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/* =========================================================================== |
Decompresses the source buffer into the destination buffer. sourceLen is |
the byte length of the source buffer. Upon entry, destLen is the total |
size of the destination buffer, which must be large enough to hold the |
entire uncompressed data. (The size of the uncompressed data must have |
been saved previously by the compressor and transmitted to the decompressor |
by some mechanism outside the scope of this compression library.) |
Upon exit, destLen is the actual size of the compressed buffer. |
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uncompress returns Z_OK if success, Z_MEM_ERROR if there was not |
enough memory, Z_BUF_ERROR if there was not enough room in the output |
buffer, or Z_DATA_ERROR if the input data was corrupted. |
*/ |
int ZEXPORT uncompress (dest, destLen, source, sourceLen) |
Bytef *dest; |
uLongf *destLen; |
const Bytef *source; |
uLong sourceLen; |
{ |
z_stream stream; |
int err; |
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stream.next_in = (z_const Bytef *)source; |
stream.avail_in = (uInt)sourceLen; |
/* Check for source > 64K on 16-bit machine: */ |
if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR; |
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stream.next_out = dest; |
stream.avail_out = (uInt)*destLen; |
if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR; |
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stream.zalloc = (alloc_func)0; |
stream.zfree = (free_func)0; |
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err = inflateInit(&stream); |
if (err != Z_OK) return err; |
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err = inflate(&stream, Z_FINISH); |
if (err != Z_STREAM_END) { |
inflateEnd(&stream); |
if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0)) |
return Z_DATA_ERROR; |
return err; |
} |
*destLen = stream.total_out; |
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err = inflateEnd(&stream); |
return err; |
} |