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Simple decoder/encoder for MNG animations

, 1 Oct 2001 CPOL
CxImageMNG: the module of CxImage used to play MNG animations.
cximagemng_src.zip
CxImgLib.dsw
zlib
zlib.mak
zlib.dsp
zlib.dsw
ZLIB.DEF
jpeg
Jpeg.dsw
Jpeg.dsp
change.log
demo
demo.mak
demo.dsp
demo.dsw
demo.clw
res
demoDoc.ico
demo.ico
Toolbar.bmp
us.png
CxImage
cximage.dsp
CxImage.dsw
text2.mng
mng
mng.dsw
mng.dsp
flake.mng
text1.mng
/* uncompr.c -- decompress a memory buffer
 * Copyright (C) 1995-1998 Jean-loup Gailly.
 * For conditions of distribution and use, see copyright notice in zlib.h 
 */

/* @(#) $Id$ */

#include "zlib.h"

/* ===========================================================================
     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.
     This function can be used to decompress a whole file at once if the
   input file is mmap'ed.

     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;

    stream.next_in = (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;

    stream.next_out = dest;
    stream.avail_out = (uInt)*destLen;
    if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;

    stream.zalloc = (alloc_func)0;
    stream.zfree = (free_func)0;

    err = inflateInit(&stream);
    if (err != Z_OK) return err;

    err = inflate(&stream, Z_FINISH);
    if (err != Z_STREAM_END) {
        inflateEnd(&stream);
        return err == Z_OK ? Z_BUF_ERROR : err;
    }
    *destLen = stream.total_out;

    err = inflateEnd(&stream);
    return err;
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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