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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_FILTER_SOURCE_GRAPHICFILTER_ITIFF_LZWDECOM_HXX
#define INCLUDED_FILTER_SOURCE_GRAPHICFILTER_ITIFF_LZWDECOM_HXX
#include <sal/types.h>
#include <tools/solar.h>
#include <array>
#define MAX_TABLE_SIZE 4096
struct LZWTableEntry {
sal_uInt16 nPrevCode;
sal_uInt16 nDataCount;
sal_uInt8 nData;
};
class SvStream;
class LZWDecompressor {
public:
LZWDecompressor();
~LZWDecompressor();
void StartDecompression(SvStream & rIStream);
sal_uLong Decompress(sal_uInt8 * pTarget, sal_uLong nMaxCount);
// Returns the number of written bytes. If < nMaxCount there is
// no more data to be unpacked or an error occurred.
private:
sal_uInt16 GetNextCode();
void AddToTable(sal_uInt16 nPrevCode, sal_uInt16 nCodeFirstData);
void DecompressSome();
SvStream * pIStream;
std::array<LZWTableEntry, MAX_TABLE_SIZE> pTable;
sal_uInt16 nTableSize;
bool bEOIFound, bInvert, bFirst;
sal_uInt16 nOldCode;
std::array<sal_uInt8, MAX_TABLE_SIZE> pOutBuf;
sal_uInt8 * pOutBufData;
sal_uInt16 nOutBufDataLen;
sal_uInt8 nInputBitsBuf;
sal_uInt16 nInputBitsBufSize;
};
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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