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