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Annotation of elwix/tools/oldlzma/SRC/7zip/Compress/RangeCoder/RangeCoderOpt.h, revision 1.1

1.1     ! misho       1: // Compress/RangeCoder/RangeCoderOpt.h
        !             2: 
        !             3: #ifndef __COMPRESS_RANGECODER_OPT_H
        !             4: #define __COMPRESS_RANGECODER_OPT_H
        !             5: 
        !             6: #define RC_INIT_VAR \
        !             7:   UInt32 range = rangeDecoder->Range; \
        !             8:   UInt32 code = rangeDecoder->Code;        
        !             9: 
        !            10: #define RC_FLUSH_VAR \
        !            11:   rangeDecoder->Range = range; \
        !            12:   rangeDecoder->Code = code;
        !            13: 
        !            14: #define RC_NORMALIZE \
        !            15:   if (range < NCompress::NRangeCoder::kTopValue) \
        !            16:     { code = (code << 8) | rangeDecoder->Stream.ReadByte(); range <<= 8; }
        !            17: 
        !            18: #define RC_GETBIT2(numMoveBits, prob, mi, A0, A1) \
        !            19:   { UInt32 bound = (range >> NCompress::NRangeCoder::kNumBitModelTotalBits) * prob; \
        !            20:   if (code < bound) \
        !            21:   { A0; range = bound; \
        !            22:     prob += (NCompress::NRangeCoder::kBitModelTotal - prob) >> numMoveBits; \
        !            23:     mi <<= 1; } \
        !            24:   else \
        !            25:   { A1; range -= bound; code -= bound; prob -= (prob) >> numMoveBits; \
        !            26:     mi = (mi + mi) + 1; }} \
        !            27:   RC_NORMALIZE
        !            28: 
        !            29: #define RC_GETBIT(numMoveBits, prob, mi) RC_GETBIT2(numMoveBits, prob, mi, ; , ;)
        !            30: 
        !            31: #endif