core/fxcodec/jbig2/JBig2_ArithDecoder.h

// 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;

struct JBig2ArithCtx {
  JBig2ArithCtx() : MPS(0), I(0) {}

  unsigned int MPS;
  unsigned int I;
};

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_