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// Copyright 2014 PDFium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
#ifndef CORE_FXCODEC_JBIG2_JBIG2_ARITHDECODER_H_
#define CORE_FXCODEC_JBIG2_JBIG2_ARITHDECODER_H_
#include <stdint.h>
#include "core/fxcrt/unowned_ptr.h"
class CJBig2_BitStream;
class JBig2ArithCtx {
public:
struct JBig2ArithQe {
uint16_t Qe;
uint8_t NMPS;
uint8_t NLPS;
uint8_t nSwitch;
};
JBig2ArithCtx();
int DecodeNLPS(const JBig2ArithQe& qe);
int DecodeNMPS(const JBig2ArithQe& qe);
unsigned int MPS() const { return m_MPS; }
unsigned int I() const { return m_I; }
private:
unsigned int m_MPS = 0;
unsigned int m_I = 0;
};
class CJBig2_ArithDecoder {
public:
explicit CJBig2_ArithDecoder(CJBig2_BitStream* pStream);
~CJBig2_ArithDecoder();
int Decode(JBig2ArithCtx* pCX);
bool IsComplete() const { return m_Complete; }
private:
void BYTEIN();
void ReadValueA();
bool m_Complete;
bool m_FinishedStream;
uint8_t m_B;
unsigned int m_C;
unsigned int m_A;
unsigned int m_CT;
UnownedPtr<CJBig2_BitStream> const m_pStream;
};
#endif // CORE_FXCODEC_JBIG2_JBIG2_ARITHDECODER_H_
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