sl@0: /* uncompr.c -- decompress a memory buffer
sl@0:  * Copyright (C) 1995-1998 Jean-loup Gailly.
sl@0:  * For conditions of distribution and use, see copyright notice in zlib.h 
sl@0:  */
sl@0: 
sl@0: /* @(#) $Id$ */
sl@0: 
sl@0: #include "zlib.h"
sl@0: 
sl@0: /* ===========================================================================
sl@0:      Decompresses the source buffer into the destination buffer.  sourceLen is
sl@0:    the byte length of the source buffer. Upon entry, destLen is the total
sl@0:    size of the destination buffer, which must be large enough to hold the
sl@0:    entire uncompressed data. (The size of the uncompressed data must have
sl@0:    been saved previously by the compressor and transmitted to the decompressor
sl@0:    by some mechanism outside the scope of this compression library.)
sl@0:    Upon exit, destLen is the actual size of the compressed buffer.
sl@0:      This function can be used to decompress a whole file at once if the
sl@0:    input file is mmap'ed.
sl@0: 
sl@0:      uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
sl@0:    enough memory, Z_BUF_ERROR if there was not enough room in the output
sl@0:    buffer, or Z_DATA_ERROR if the input data was corrupted.
sl@0: */
sl@0: int ZEXPORT uncompress (Bytef *dest, uLongf *destLen, const Bytef *source, uLong sourceLen)
sl@0: {
sl@0:     z_stream stream;
sl@0:     int err;
sl@0: 
sl@0:     stream.next_in = (Bytef*)source;
sl@0:     stream.avail_in = (uInt)sourceLen;
sl@0:     /* Check for source > 64K on 16-bit machine: */
sl@0:     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
sl@0: 
sl@0:     stream.next_out = dest;
sl@0:     stream.avail_out = (uInt)*destLen;
sl@0:     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
sl@0: 
sl@0:     stream.zalloc = (alloc_func)0;
sl@0:     stream.zfree = (free_func)0;
sl@0: 
sl@0:     err = inflateInit(&stream);
sl@0:     if (err != Z_OK) return err;
sl@0: 
sl@0:     err = inflate(&stream, Z_FINISH);
sl@0:     if (err != Z_STREAM_END) {
sl@0:         inflateEnd(&stream);
sl@0:         return err == Z_OK ? Z_BUF_ERROR : err;
sl@0:     }
sl@0:     *destLen = stream.total_out;
sl@0: 
sl@0:     err = inflateEnd(&stream);
sl@0:     return err;
sl@0: }