// Copyright 2014 PDFium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
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#ifndef CORE_FXCODEC_JBIG2_JBIG2_BITSTREAM_H_
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#define CORE_FXCODEC_JBIG2_JBIG2_BITSTREAM_H_
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#include "core/fxcrt/include/fx_basic.h"
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class CPDF_StreamAcc;
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class CJBig2_BitStream {
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public:
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explicit CJBig2_BitStream(CPDF_StreamAcc* pSrcStream);
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~CJBig2_BitStream();
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// TODO(thestig): readFoo() should return bool.
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int32_t readNBits(uint32_t nBits, uint32_t* dwResult);
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int32_t readNBits(uint32_t nBits, int32_t* nResult);
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int32_t read1Bit(uint32_t* dwResult);
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int32_t read1Bit(FX_BOOL* bResult);
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int32_t read1Byte(uint8_t* cResult);
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int32_t readInteger(uint32_t* dwResult);
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int32_t readShortInteger(uint16_t* wResult);
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void alignByte();
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uint8_t getCurByte() const;
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void incByteIdx();
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uint8_t getCurByte_arith() const;
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uint8_t getNextByte_arith() const;
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uint32_t getOffset() const;
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void setOffset(uint32_t dwOffset);
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uint32_t getBitPos() const;
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void setBitPos(uint32_t dwBitPos);
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const uint8_t* getBuf() const;
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uint32_t getLength() const { return m_dwLength; }
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const uint8_t* getPointer() const;
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void offset(uint32_t dwOffset);
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uint32_t getByteLeft() const;
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uint32_t getObjNum() const;
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private:
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void AdvanceBit();
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bool IsInBound() const;
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uint32_t LengthInBits() const;
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const uint8_t* m_pBuf;
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uint32_t m_dwLength;
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uint32_t m_dwByteIdx;
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uint32_t m_dwBitIdx;
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const uint32_t m_dwObjNum;
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CJBig2_BitStream(const CJBig2_BitStream&) = delete;
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void operator=(const CJBig2_BitStream&) = delete;
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};
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#endif // CORE_FXCODEC_JBIG2_JBIG2_BITSTREAM_H_
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