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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_BITSTREAM_H_
#define CORE_FXCODEC_JBIG2_JBIG2_BITSTREAM_H_
#include "core/include/fxcrt/fx_basic.h"
class CPDF_StreamAcc;
class CJBig2_BitStream {
public:
explicit CJBig2_BitStream(CPDF_StreamAcc* pSrcStream);
~CJBig2_BitStream();
// TODO(thestig): readFoo() should return bool.
int32_t readNBits(FX_DWORD nBits, FX_DWORD* dwResult);
int32_t readNBits(FX_DWORD nBits, int32_t* nResult);
int32_t read1Bit(FX_DWORD* dwResult);
int32_t read1Bit(FX_BOOL* bResult);
int32_t read1Byte(uint8_t* cResult);
int32_t readInteger(FX_DWORD* dwResult);
int32_t readShortInteger(uint16_t* wResult);
void alignByte();
uint8_t getCurByte() const;
void incByteIdx();
uint8_t getCurByte_arith() const;
uint8_t getNextByte_arith() const;
FX_DWORD getOffset() const;
void setOffset(FX_DWORD dwOffset);
FX_DWORD getBitPos() const;
void setBitPos(FX_DWORD dwBitPos);
const uint8_t* getBuf() const;
FX_DWORD getLength() const { return m_dwLength; }
const uint8_t* getPointer() const;
void offset(FX_DWORD dwOffset);
FX_DWORD getByteLeft() const;
FX_DWORD getObjNum() const;
private:
void AdvanceBit();
bool IsInBound() const;
FX_DWORD LengthInBits() const;
const uint8_t* m_pBuf;
FX_DWORD m_dwLength;
FX_DWORD m_dwByteIdx;
FX_DWORD m_dwBitIdx;
const FX_DWORD m_dwObjNum;
CJBig2_BitStream(const CJBig2_BitStream&) = delete;
void operator=(const CJBig2_BitStream&) = delete;
};
#endif // CORE_FXCODEC_JBIG2_JBIG2_BITSTREAM_H_
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