1 files changed, 51 insertions, 0 deletions
diff --git a/hostTools/lzma/decompress/AriBitCoder.h b/hostTools/lzma/decompress/AriBitCoder.h
new file mode 100644
index 0000000..cedc189
--- /dev/null
+++ b/hostTools/lzma/decompress/AriBitCoder.h
@@ -0,0 +1,51 @@
+#ifndef __COMPRESSION_BITCODER_H
+#define __COMPRESSION_BITCODER_H
+
+#include "RangeCoder.h"
+
+#define kNumBitModelTotalBits  11
+#define kBitModelTotal (1 << kNumBitModelTotalBits)
+
+#define kNumMoveReducingBits 2
+
+
+typedef UINT32 CBitDecoder;
+
+INLINE  void BitDecoderInit(CBitDecoder *bitDecoder)
+  { 
+    *bitDecoder = kBitModelTotal / 2; 
+  }
+
+#if 0
+UINT32 BitDecode(ISequentialInStream *in_stream, CBitDecoder *bitDecoder, CRangeDecoder *aRangeDecoder);
+#else
+INLINE  UINT32 BitDecode(ISequentialInStream *in_stream, CBitDecoder *bitDecoder, CRangeDecoder *aRangeDecoder)
+  {
+    UINT32 aNewBound = (aRangeDecoder->m_Range >> kNumBitModelTotalBits) * (*bitDecoder);
+    if (aRangeDecoder->m_Code < aNewBound)
+    {
+      aRangeDecoder->m_Range = aNewBound;
+      *bitDecoder += (kBitModelTotal - *bitDecoder) >> kNumMoveBits;
+      if (aRangeDecoder->m_Range < kTopValue)
+      {
+        aRangeDecoder->m_Code = (aRangeDecoder->m_Code << 8) | InStreamReadByte(in_stream);
+        aRangeDecoder->m_Range <<= 8;
+      }
+      return 0;
+    }
+    else
+    {
+      aRangeDecoder->m_Range -= aNewBound;
+      aRangeDecoder->m_Code -= aNewBound;
+      *bitDecoder -= (*bitDecoder) >> kNumMoveBits;
+      if (aRangeDecoder->m_Range < kTopValue)
+      {
+        aRangeDecoder->m_Code = (aRangeDecoder->m_Code << 8) | InStreamReadByte(in_stream);
+        aRangeDecoder->m_Range <<= 8;
+      }
+      return 1;
+    }
+  }
+#endif
+
+#endif