cannam@89: /* uncompr.c -- decompress a memory buffer
cannam@89:  * Copyright (C) 1995-2003, 2010 Jean-loup Gailly.
cannam@89:  * For conditions of distribution and use, see copyright notice in zlib.h
cannam@89:  */
cannam@89: 
cannam@89: /* @(#) $Id$ */
cannam@89: 
cannam@89: #define ZLIB_INTERNAL
cannam@89: #include "zlib.h"
cannam@89: 
cannam@89: /* ===========================================================================
cannam@89:      Decompresses the source buffer into the destination buffer.  sourceLen is
cannam@89:    the byte length of the source buffer. Upon entry, destLen is the total
cannam@89:    size of the destination buffer, which must be large enough to hold the
cannam@89:    entire uncompressed data. (The size of the uncompressed data must have
cannam@89:    been saved previously by the compressor and transmitted to the decompressor
cannam@89:    by some mechanism outside the scope of this compression library.)
cannam@89:    Upon exit, destLen is the actual size of the compressed buffer.
cannam@89: 
cannam@89:      uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
cannam@89:    enough memory, Z_BUF_ERROR if there was not enough room in the output
cannam@89:    buffer, or Z_DATA_ERROR if the input data was corrupted.
cannam@89: */
cannam@89: int ZEXPORT uncompress (dest, destLen, source, sourceLen)
cannam@89:     Bytef *dest;
cannam@89:     uLongf *destLen;
cannam@89:     const Bytef *source;
cannam@89:     uLong sourceLen;
cannam@89: {
cannam@89:     z_stream stream;
cannam@89:     int err;
cannam@89: 
cannam@89:     stream.next_in = (Bytef*)source;
cannam@89:     stream.avail_in = (uInt)sourceLen;
cannam@89:     /* Check for source > 64K on 16-bit machine: */
cannam@89:     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
cannam@89: 
cannam@89:     stream.next_out = dest;
cannam@89:     stream.avail_out = (uInt)*destLen;
cannam@89:     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
cannam@89: 
cannam@89:     stream.zalloc = (alloc_func)0;
cannam@89:     stream.zfree = (free_func)0;
cannam@89: 
cannam@89:     err = inflateInit(&stream);
cannam@89:     if (err != Z_OK) return err;
cannam@89: 
cannam@89:     err = inflate(&stream, Z_FINISH);
cannam@89:     if (err != Z_STREAM_END) {
cannam@89:         inflateEnd(&stream);
cannam@89:         if (err == Z_NEED_DICT || (err == Z_BUF_ERROR && stream.avail_in == 0))
cannam@89:             return Z_DATA_ERROR;
cannam@89:         return err;
cannam@89:     }
cannam@89:     *destLen = stream.total_out;
cannam@89: 
cannam@89:     err = inflateEnd(&stream);
cannam@89:     return err;
cannam@89: }