Return to RangeCoderOpt.h CVS log

Up to [ELWIX - Embedded LightWeight unIX -] / elwix / tools / oldlzma / SRC / 7zip / Compress / RangeCoder

Annotation of elwix/tools/oldlzma/SRC/7zip/Compress/RangeCoder/RangeCoderOpt.h, revision 1.1.1.1

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