1 // Copyright 2014 PDFium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com 6 7 #ifndef CORE_FXCODEC_JBIG2_JBIG2_BITSTREAM_H_ 8 #define CORE_FXCODEC_JBIG2_JBIG2_BITSTREAM_H_ 9 10 #include "core/fxcrt/fx_basic.h" 11 12 class CPDF_StreamAcc; 13 14 class CJBig2_BitStream { 15 public: 16 explicit CJBig2_BitStream(CPDF_StreamAcc* pSrcStream); 17 ~CJBig2_BitStream(); 18 19 // TODO(thestig): readFoo() should return bool. 20 int32_t readNBits(uint32_t nBits, uint32_t* dwResult); 21 int32_t readNBits(uint32_t nBits, int32_t* nResult); 22 int32_t read1Bit(uint32_t* dwResult); 23 int32_t read1Bit(bool* bResult); 24 int32_t read1Byte(uint8_t* cResult); 25 int32_t readInteger(uint32_t* dwResult); 26 int32_t readShortInteger(uint16_t* wResult); 27 void alignByte(); 28 uint8_t getCurByte() const; 29 void incByteIdx(); 30 uint8_t getCurByte_arith() const; 31 uint8_t getNextByte_arith() const; 32 uint32_t getOffset() const; 33 void setOffset(uint32_t dwOffset); 34 uint32_t getBitPos() const; 35 void setBitPos(uint32_t dwBitPos); 36 const uint8_t* getBuf() const; getLength()37 uint32_t getLength() const { return m_dwLength; } 38 const uint8_t* getPointer() const; 39 void offset(uint32_t dwOffset); 40 uint32_t getByteLeft() const; 41 uint32_t getObjNum() const; 42 43 private: 44 void AdvanceBit(); 45 bool IsInBound() const; 46 uint32_t LengthInBits() const; 47 48 const uint8_t* m_pBuf; 49 uint32_t m_dwLength; 50 uint32_t m_dwByteIdx; 51 uint32_t m_dwBitIdx; 52 const uint32_t m_dwObjNum; 53 54 CJBig2_BitStream(const CJBig2_BitStream&) = delete; 55 void operator=(const CJBig2_BitStream&) = delete; 56 }; 57 58 #endif // CORE_FXCODEC_JBIG2_JBIG2_BITSTREAM_H_ 59