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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_CCIDECOM_HXX
#define INCLUDED_FILTER_SOURCE_GRAPHICFILTER_ITIFF_CCIDECOM_HXX
#include <tools/stream.hxx>
#define CCI_OPTION_2D 1 // 2D compression (instead of 1D)
#define CCI_OPTION_EOL 2 // There are EOL-Codes at the end of each line.
#define CCI_OPTION_BYTEALIGNEOL 4 // Filling bits before each EOL-Code, so that
// the end of EOL is bytes aligned
#define CCI_OPTION_BYTEALIGNROW 8 // Rows always start byte aligned
#define CCI_OPTION_INVERSEBITORDER 16
// Entry in the Huffman table:
struct CCIHuffmanTableEntry {
sal_uInt16 nValue; // The data vlaue.
sal_uInt16 nCode; // The code through which the data value is represented.
sal_uInt16 nCodeBits; // Size of the code in bits.
};
// Entry in a hash table for daft decoding.
struct CCILookUpTableEntry {
sal_uInt16 nValue;
sal_uInt16 nCodeBits;
};
class CCIDecompressor {
public:
CCIDecompressor( sal_uLong nOptions, sal_uInt32 nImageWidth );
~CCIDecompressor();
void StartDecompression( SvStream & rIStream );
bool DecompressScanline(sal_uInt8 * pTarget, sal_uLong nTargetBits, bool bLastLine );
private:
void MakeLookUp(const CCIHuffmanTableEntry * pHufTab,
const CCIHuffmanTableEntry * pHufTabSave,
CCILookUpTableEntry * pLookUp,
sal_uInt16 nHuffmanTableSize,
sal_uInt16 nMaxCodeBits);
bool ReadEOL( sal_uInt32 nMaxFillBits );
bool Read2DTag();
sal_uInt8 ReadBlackOrWhite();
sal_uInt16 ReadCodeAndDecode(const CCILookUpTableEntry * pLookUp,
sal_uInt16 nMaxCodeBits);
void FillBits(sal_uInt8 * pTarget, sal_uInt16 nTargetBits,
sal_uInt16 nBitPos, sal_uInt16 nNumBits,
sal_uInt8 nBlackOrWhite);
sal_uInt16 CountBits(const sal_uInt8 * pData, sal_uInt16 nDataSizeBits,
sal_uInt16 nBitPos, sal_uInt8 nBlackOrWhite);
void Read1DScanlineData(sal_uInt8 * pTarget, sal_uInt16 nTargetBits);
void Read2DScanlineData(sal_uInt8 * pTarget, sal_uInt16 nTargetBits);
bool bTableBad;
bool bStatus;
sal_uInt8* pByteSwap;
SvStream * pIStream;
sal_uInt32 nEOLCount;
sal_uInt32 nWidth;
sal_uLong nOptions;
bool bFirstEOL;
CCILookUpTableEntry * pWhiteLookUp;
CCILookUpTableEntry * pBlackLookUp;
CCILookUpTableEntry * p2DModeLookUp;
CCILookUpTableEntry * pUncompLookUp;
sal_uLong nInputBitsBuf;
sal_uInt16 nInputBitsBufSize;
sal_uInt8 * pLastLine;
sal_uLong nLastLineSize;
};
#endif
/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
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