5128eecc9f 2011-02-23        kinaba: /* uncompr.c -- decompress a memory buffer
5128eecc9f 2011-02-23        kinaba:  * Copyright (C) 1995-1998 Jean-loup Gailly.
5128eecc9f 2011-02-23        kinaba:  * For conditions of distribution and use, see copyright notice in zlib.h
5128eecc9f 2011-02-23        kinaba:  */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* @(#) $Id$ */
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: #include "zlib.h"
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba: /* ===========================================================================
5128eecc9f 2011-02-23        kinaba:      Decompresses the source buffer into the destination buffer.  sourceLen is
5128eecc9f 2011-02-23        kinaba:    the byte length of the source buffer. Upon entry, destLen is the total
5128eecc9f 2011-02-23        kinaba:    size of the destination buffer, which must be large enough to hold the
5128eecc9f 2011-02-23        kinaba:    entire uncompressed data. (The size of the uncompressed data must have
5128eecc9f 2011-02-23        kinaba:    been saved previously by the compressor and transmitted to the decompressor
5128eecc9f 2011-02-23        kinaba:    by some mechanism outside the scope of this compression library.)
5128eecc9f 2011-02-23        kinaba:    Upon exit, destLen is the actual size of the compressed buffer.
5128eecc9f 2011-02-23        kinaba:      This function can be used to decompress a whole file at once if the
5128eecc9f 2011-02-23        kinaba:    input file is mmap'ed.
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:      uncompress returns Z_OK if success, Z_MEM_ERROR if there was not
5128eecc9f 2011-02-23        kinaba:    enough memory, Z_BUF_ERROR if there was not enough room in the output
5128eecc9f 2011-02-23        kinaba:    buffer, or Z_DATA_ERROR if the input data was corrupted.
5128eecc9f 2011-02-23        kinaba: */
5128eecc9f 2011-02-23        kinaba: int ZEXPORT uncompress (dest, destLen, source, sourceLen)
5128eecc9f 2011-02-23        kinaba:     Bytef *dest;
5128eecc9f 2011-02-23        kinaba:     uLongf *destLen;
5128eecc9f 2011-02-23        kinaba:     const Bytef *source;
5128eecc9f 2011-02-23        kinaba:     uLong sourceLen;
5128eecc9f 2011-02-23        kinaba: {
5128eecc9f 2011-02-23        kinaba:     z_stream stream;
5128eecc9f 2011-02-23        kinaba:     int err;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     stream.next_in = (Bytef*)source;
5128eecc9f 2011-02-23        kinaba:     stream.avail_in = (uInt)sourceLen;
5128eecc9f 2011-02-23        kinaba:     /* Check for source > 64K on 16-bit machine: */
5128eecc9f 2011-02-23        kinaba:     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     stream.next_out = dest;
5128eecc9f 2011-02-23        kinaba:     stream.avail_out = (uInt)*destLen;
5128eecc9f 2011-02-23        kinaba:     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     stream.zalloc = (alloc_func)0;
5128eecc9f 2011-02-23        kinaba:     stream.zfree = (free_func)0;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     err = inflateInit(&stream);
5128eecc9f 2011-02-23        kinaba:     if (err != Z_OK) return err;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     err = inflate(&stream, Z_FINISH);
5128eecc9f 2011-02-23        kinaba:     if (err != Z_STREAM_END) {
5128eecc9f 2011-02-23        kinaba:         inflateEnd(&stream);
5128eecc9f 2011-02-23        kinaba:         return err == Z_OK ? Z_BUF_ERROR : err;
5128eecc9f 2011-02-23        kinaba:     }
5128eecc9f 2011-02-23        kinaba:     *destLen = stream.total_out;
5128eecc9f 2011-02-23        kinaba: 
5128eecc9f 2011-02-23        kinaba:     err = inflateEnd(&stream);
5128eecc9f 2011-02-23        kinaba:     return err;
5128eecc9f 2011-02-23        kinaba: }