summaryrefslogtreecommitdiff
path: root/core/fxcodec/jbig2/JBig2_ArithDecoder.h
blob: 2ec64fe954526596f916487fefa4293912316f54 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
// 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/cfx_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;
  uint8_t m_B;
  unsigned int m_C;
  unsigned int m_A;
  unsigned int m_CT;
  CFX_UnownedPtr<CJBig2_BitStream> const m_pStream;
};

#endif  // CORE_FXCODEC_JBIG2_JBIG2_ARITHDECODER_H_