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/*************************************************************************
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* Copyright 2000, 2010 Oracle and/or its affiliates.
*
* OpenOffice.org - a multi-platform office productivity suite
*
* This file is part of OpenOffice.org.
*
* OpenOffice.org is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License version 3
* only, as published by the Free Software Foundation.
*
* OpenOffice.org is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License version 3 for more details
* (a copy is included in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU Lesser General Public License
* version 3 along with OpenOffice.org. If not, see
* <http://www.openoffice.org/license.html>
* for a copy of the LGPLv3 License.
*
************************************************************************/
/* $Id: hgzip.h,v 1.5 2008-06-04 09:57:59 vg Exp $ */
#ifndef _HWPGZIP_H_
#define _HWPGZIP_H_
// DVO: add zlib/ prefix
#ifdef SYSTEM_ZLIB
#include <zlib.h>
#else
#include "zlib/zlib.h"
#endif
class HStream;
/**
* @short Structure for using z_stream
*/
struct gz_stream
{
z_stream stream;
/**
* The error code of z_stream operation
*/
int z_err;
/**
* EOF of the input file
*/
int z_eof;
/**
* Stream
*/
HStream* _inputstream;
/**
* Input buffer
*/
Byte *inbuf;
/**
* Output buffer
*/
Byte *outbuf;
/**
* Crc32 of uncompressed data
*/
uLong crc;
/**
* Stream
*/
char *msg;
/**
* It becomes one when the input file type is not gz file
*/
int transparent;
/**
* 'w' or 'r'
*/
char mode;
};
/**
* Opens a gzipped stream for reading.
* gz_open returns NULL if the stream could not be opened or if there was
* insufficient memory to allocate the (de)compression state; errno
* can be checked to distinguish the two cases (if errno is zero, the
* zlib error is Z_MEM_ERROR).
* @param _stream Reference of stream object having binary data.
*/
gz_stream *gz_open ( HStream& _stream );
/**
* Flushes all pending output if necessary, closes the compressed stream
* and deallocates all the (de)compression state
*/
int gz_close ( gz_stream *file );
/**
* Reads the given number of uncompressed bytes from the compressed stream
* @param file Gzipped stream
* @param buf Buffer to have the data to be read
* @param len Length of data to be read
* @returns The number of bytes actually read
*/
int gz_read ( gz_stream *file, voidp buf, unsigned len );
/**
* Flushes all pending output into the compressed file
* gz_flush should be called only when strictly necessary because it can
* degrade compression
* @param flush Is as in the deflate() function
*/
int gz_flush ( gz_stream *file, int flush );
#endif /* _HWPGZIP_H_ */
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