Chris@4: /* uncompr.c -- decompress a memory buffer
Chris@4:  * Copyright (C) 1995-2003, 2010 Jean-loup Gailly.
Chris@4:  * For conditions of distribution and use, see copyright notice in zlib.h
Chris@4:  */
Chris@4: 
Chris@4: /* @(#) $Id$ */
Chris@4: 
Chris@4: #define ZLIB_INTERNAL
Chris@4: #include "zlib.h"
Chris@4: 
Chris@4: /* ===========================================================================
Chris@4:      Decompresses the source buffer into the destination buffer.  sourceLen is
Chris@4:    the byte length of the source buffer. Upon entry, destLen is the total
Chris@4:    size of the destination buffer, which must be large enough to hold the
Chris@4:    entire uncompressed data. (The size of the uncompressed data must have
Chris@4:    been saved previously by the compressor and transmitted to the decompressor
Chris@4:    by some mechanism outside the scope of this compression library.)
Chris@4:    Upon exit, destLen is the actual size of the compressed buffer.
Chris@4: 
Chris@4:      uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
Chris@4:    enough memory, Z_BUF_ERROR if there was not enough room in the output
Chris@4:    buffer, or Z_DATA_ERROR if the input data was corrupted.
Chris@4: */
Chris@4: int ZEXPORT uncompress (dest, destLen, source, sourceLen)
Chris@4:     Bytef *dest;
Chris@4:     uLongf *destLen;
Chris@4:     const Bytef *source;
Chris@4:     uLong sourceLen;
Chris@4: {
Chris@4:     z_stream stream;
Chris@4:     int err;
Chris@4: 
Chris@4:     stream.next_in = (Bytef*)source;
Chris@4:     stream.avail_in = (uInt)sourceLen;
Chris@4:     /* Check for source > 64K on 16-bit machine: */
Chris@4:     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
Chris@4: 
Chris@4:     stream.next_out = dest;
Chris@4:     stream.avail_out = (uInt)*destLen;
Chris@4:     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
Chris@4: 
Chris@4:     stream.zalloc = (alloc_func)0;
Chris@4:     stream.zfree = (free_func)0;
Chris@4: 
Chris@4:     err = inflateInit(&stream);
Chris@4:     if (err != Z_OK) return err;
Chris@4: 
Chris@4:     err = inflate(&stream, Z_FINISH);
Chris@4:     if (err != Z_STREAM_END) {
Chris@4:         inflateEnd(&stream);
Chris@4:         if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
Chris@4:             return Z_DATA_ERROR;
Chris@4:         return err;
Chris@4:     }
Chris@4:     *destLen = stream.total_out;
Chris@4: 
Chris@4:     err = inflateEnd(&stream);
Chris@4:     return err;
Chris@4: }