diff options
Diffstat (limited to 'core/fxcodec/jbig2/JBig2_BitStream.h')
-rw-r--r-- | core/fxcodec/jbig2/JBig2_BitStream.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/core/fxcodec/jbig2/JBig2_BitStream.h b/core/fxcodec/jbig2/JBig2_BitStream.h new file mode 100644 index 0000000000..c24fedfba1 --- /dev/null +++ b/core/fxcodec/jbig2/JBig2_BitStream.h @@ -0,0 +1,58 @@ +// 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(FX_WORD* 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_ |