diff options
author | Igor Pavlov <ipavlov@users.sourceforge.net> | 2007-01-20 03:00:00 +0300 |
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committer | Kornel LesiĆski <kornel@geekhood.net> | 2016-05-28 02:15:49 +0300 |
commit | d9666cf046a8453b33b3e2fbf4d82295a9f87df3 (patch) | |
tree | c722ed19b844b53042aec0c1d7d2f8381140a5ed /CPP/7zip/Compress/RangeCoder/RangeCoderOpt.h | |
parent | 804edc5756fede54dbb1aefda6d39d306111938d (diff) |
4.44 beta
Diffstat (limited to 'CPP/7zip/Compress/RangeCoder/RangeCoderOpt.h')
-rwxr-xr-x | CPP/7zip/Compress/RangeCoder/RangeCoderOpt.h | 31 |
1 files changed, 31 insertions, 0 deletions
diff --git a/CPP/7zip/Compress/RangeCoder/RangeCoderOpt.h b/CPP/7zip/Compress/RangeCoder/RangeCoderOpt.h new file mode 100755 index 00000000..668b9a5b --- /dev/null +++ b/CPP/7zip/Compress/RangeCoder/RangeCoderOpt.h @@ -0,0 +1,31 @@ +// Compress/RangeCoder/RangeCoderOpt.h + +#ifndef __COMPRESS_RANGECODER_OPT_H +#define __COMPRESS_RANGECODER_OPT_H + +#define RC_INIT_VAR \ + UInt32 range = rangeDecoder->Range; \ + UInt32 code = rangeDecoder->Code; + +#define RC_FLUSH_VAR \ + rangeDecoder->Range = range; \ + rangeDecoder->Code = code; + +#define RC_NORMALIZE \ + if (range < NCompress::NRangeCoder::kTopValue) \ + { code = (code << 8) | rangeDecoder->Stream.ReadByte(); range <<= 8; } + +#define RC_GETBIT2(numMoveBits, prob, mi, A0, A1) \ + { UInt32 bound = (range >> NCompress::NRangeCoder::kNumBitModelTotalBits) * prob; \ + if (code < bound) \ + { A0; range = bound; \ + prob += (NCompress::NRangeCoder::kBitModelTotal - prob) >> numMoveBits; \ + mi <<= 1; } \ + else \ + { A1; range -= bound; code -= bound; prob -= (prob) >> numMoveBits; \ + mi = (mi + mi) + 1; }} \ + RC_NORMALIZE + +#define RC_GETBIT(numMoveBits, prob, mi) RC_GETBIT2(numMoveBits, prob, mi, ; , ;) + +#endif |