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