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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
* This file is part of the LibreOffice project.
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* This file incorporates work covered by the following license notice:
*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed
* with this work for additional information regarding copyright
* ownership. The ASF licenses this file to you under the Apache
* License, Version 2.0 (the "License"); you may not use this file
* except in compliance with the License. You may obtain a copy of
* the License at http://www.apache.org/licenses/LICENSE-2.0 .
*/
#ifndef INCLUDED_TOOLS_ZCODEC_HXX
#define INCLUDED_TOOLS_ZCODEC_HXX
#include <tools/toolsdllapi.h>
#include <tools/long.hxx>
#include <memory>
#define ZCODEC_NO_COMPRESSION 0
#define ZCODEC_DEFAULT_COMPRESSION 6
class SvStream;
// The overall client call protocol is one of:
// * BeginCompression, Compress, EndCompression
// * BeginCompression, Decompress, EndCompression
// * BeginCompression, Write*, EndCompression
// * BeginCompression, Read*, EndCompression
// * BeginCompression, ReadAsynchron*, EndCompression
class SAL_WARN_UNUSED TOOLS_DLLPUBLIC ZCodec
{
enum State { STATE_INIT, STATE_DECOMPRESS, STATE_COMPRESS };
State meState;
bool mbStatus;
bool mbFinish;
std::unique_ptr<sal_uInt8[]> mpInBuf;
size_t mnInBufSize;
size_t mnInToRead;
SvStream* mpOStm;
std::unique_ptr<sal_uInt8[]> mpOutBuf;
size_t mnOutBufSize;
int mnCompressLevel;
bool mbGzLib;
void* mpsC_Stream;
void InitCompress();
void InitDecompress(SvStream & inStream);
void ImplWriteBack();
public:
ZCodec( size_t nInBufSize = 32768, size_t nOutBufSize = 32768 );
~ZCodec();
/**
* @brief Checks whether a stream is Z compressed
*
* @param rIStm the stream to check
*/
static bool IsZCompressed( SvStream& rIStm );
void BeginCompression( int nCompressLevel = ZCODEC_DEFAULT_COMPRESSION, bool gzLib = false );
tools::Long EndCompression();
void Compress( SvStream& rIStm, SvStream& rOStm );
tools::Long Decompress( SvStream& rIStm, SvStream& rOStm );
bool AttemptDecompression( SvStream& rIStm, SvStream& rOStm );
void Write( SvStream& rOStm, const sal_uInt8* pData, sal_uInt32 nSize );
tools::Long Read( SvStream& rIStm, sal_uInt8* pData, sal_uInt32 nSize );
};
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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