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File:  [ELWIX - Embedded LightWeight unIX -] / elwix / tools / oldlzma / SRC / 7zip / Compress / RangeCoder / RangeCoderOpt.h
Revision 1.1.1.1 (vendor branch): download - view: text, annotated - select for diffs - revision graph
Tue May 14 09:04:51 2013 UTC (11 years, 2 months ago) by misho
Branches: misho, elwix1_9_mips, MAIN
CVS tags: start, elwix2_8, elwix2_7, elwix2_6, elwix2_3, elwix2_2, HEAD, ELWIX2_7, ELWIX2_6, ELWIX2_5, ELWIX2_2p0
oldlzma needs for uboot

// 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
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