mirror of
https://github.com/JakubMelka/PDF4QT.git
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126 lines
3.3 KiB
C++
126 lines
3.3 KiB
C++
// Copyright (C) 2022 Jakub Melka
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//
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// This file is part of PDF4QT.
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//
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// PDF4QT is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Lesser General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// with the written consent of the copyright owner, any later version.
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//
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// PDF4QT is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public License
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// along with PDF4QT. If not, see <https://www.gnu.org/licenses/>.
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#ifndef PDF3D_U3D_H
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#define PDF3D_U3D_H
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#include "pdfglobal.h"
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#include <QBuffer>
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namespace pdf
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{
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namespace u3d
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{
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class PDF3D_U3D
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{
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public:
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static PDF3D_U3D parse(QByteArray data);
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};
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class PDF3D_U3D_ContextManager
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{
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public:
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bool isContextCompressed(uint32_t context) const;
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bool isContextStaticAndCompressed(uint32_t context) const;
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uint32_t getTotalSymbolFrequency(uint32_t context) const;
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uint32_t getSymbolFrequency(uint32_t context, uint32_t symbol) const;
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uint32_t getCumulativeSymbolFrequency(uint32_t context, uint32_t symbol) const;
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uint32_t getSymbolFromFrequency(uint32_t context, uint32_t symbolFrequency) const;
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void addSymbol(uint32_t context, uint32_t symbol);
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private:
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struct ContextData
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{
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ContextData()
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{
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symbols= { { 0, Data{ 1, 1} } };
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}
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struct Data
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{
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uint32_t symbolCount = 0;
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uint32_t cumulativeSymbolCount = 0;
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};
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std::map<uint32_t, Data> symbols;
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};
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const ContextData* getContextData(uint32_t context) const;
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std::map<uint32_t, ContextData> m_contexts;
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};
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class PDF3D_U3D_Constants
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{
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public:
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static constexpr uint32_t S_NOT_THREE_QUARTER_MASK = 0x00003FFF;
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static constexpr uint32_t S_QUARTER_MASK = 0x00004000;
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static constexpr uint32_t S_NOT_HALF_MASK = 0x00007FFF;
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static constexpr uint32_t S_HALF_MASK = 0x00008000;
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static constexpr uint32_t S_STATIC_FULL = 0x00000400;
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static constexpr uint32_t S_MAX_RANGE = S_STATIC_FULL + 0x00003FFF;
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static constexpr uint32_t S_CONTEXT_8 = 0;
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static constexpr uint32_t S_MAX_CUMULATIVE_SYMBOL_COUNT = 0x00001fff;
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static constexpr uint32_t S_MAXIMUM_SYMBOL_IN_HISTOGRAM = 0x0000FFFF;
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};
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class PDF3D_U3D_DataReader
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{
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public:
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PDF3D_U3D_DataReader(QByteArray data);
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~PDF3D_U3D_DataReader();
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uint8_t readU8();
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uint16_t readU16();
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uint32_t readU32();
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uint64_t readU64();
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int32_t readI32();
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float readF32();
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uint8_t readCompressedU8(uint32_t context);
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uint16_t readCompressedU16(uint32_t context);
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uint32_t readCompressedU32(uint32_t context);
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private:
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uint32_t readSymbol(uint32_t context);
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uint8_t swapBits8(uint8_t source);
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uint32_t readBit();
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uint32_t read15Bits();
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QByteArray m_data;
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PDF3D_U3D_ContextManager m_contextManager;
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uint32_t m_high;
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uint32_t m_low;
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uint32_t m_underflow;
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uint32_t m_code;
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uint32_t m_position;
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};
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} // namespace u3d
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} // namespace pdf
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#endif // PDF3D_U3D_H
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