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65 lines
1.6 KiB
C++
65 lines
1.6 KiB
C++
#ifndef APE_BITARRAY_H
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#define APE_BITARRAY_H
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#include "IO.h"
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//#define BUILD_RANGE_TABLE
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struct RANGE_CODER_STRUCT_COMPRESS
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{
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unsigned int low; // low end of interval
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unsigned int range; // length of interval
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unsigned int help; // bytes_to_follow resp. intermediate value
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unsigned char buffer; // buffer for input / output
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};
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struct BIT_ARRAY_STATE
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{
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unsigned __int32 k;
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unsigned __int32 nKSum;
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};
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class CBitArray
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{
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public:
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// construction / destruction
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CBitArray(CIO *pIO);
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~CBitArray();
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// encoding
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int EncodeUnsignedLong(unsigned int n);
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int EncodeValue(int nEncode, BIT_ARRAY_STATE & BitArrayState);
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int EncodeBits(unsigned int nValue, int nBits);
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// output (saving)
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int OutputBitArray(BOOL bFinalize = FALSE);
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// other functions
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void Finalize();
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void AdvanceToByteBoundary();
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__inline unsigned __int32 GetCurrentBitIndex() { return m_nCurrentBitIndex; }
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void FlushState(BIT_ARRAY_STATE & BitArrayState);
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void FlushBitArray();
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private:
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// data members
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unsigned __int32 * m_pBitArray;
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CIO * m_pIO;
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unsigned __int32 m_nCurrentBitIndex;
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RANGE_CODER_STRUCT_COMPRESS m_RangeCoderInfo;
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// functions
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__inline void NormalizeRangeCoder();
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__inline void EncodeFast(int nRangeWidth, int nRangeTotal, int nShift);
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__inline void PutC(unsigned char ucValue);
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__inline void EncodeDirect(int nValue, int nShift);
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#ifdef BUILD_RANGE_TABLE
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void OutputRangeTable();
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#endif
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};
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#endif /* APE_BITARRAY_H */
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