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