1 files changed, 161 insertions, 0 deletions
diff --git a/other-licenses/7zstub/src/7zip/Compress/RangeCoder/RangeCoderBitTree.h b/other-licenses/7zstub/src/7zip/Compress/RangeCoder/RangeCoderBitTree.h
new file mode 100644
index 000000000..1fa023f3b
--- /dev/null
+++ b/other-licenses/7zstub/src/7zip/Compress/RangeCoder/RangeCoderBitTree.h
@@ -0,0 +1,161 @@
+// Compress/RangeCoder/RangeCoderBitTree.h
+
+#ifndef __COMPRESS_RANGECODER_BIT_TREE_H
+#define __COMPRESS_RANGECODER_BIT_TREE_H
+
+#include "RangeCoderBit.h"
+#include "RangeCoderOpt.h"
+
+namespace NCompress {
+namespace NRangeCoder {
+
+template <int numMoveBits, int NumBitLevels>
+class CBitTreeEncoder
+{
+  CBitEncoder<numMoveBits> Models[1 << NumBitLevels];
+public:
+  void Init()
+  {
+    for(UInt32 i = 1; i < (1 << NumBitLevels); i++)
+      Models[i].Init();
+  }
+  void Encode(CEncoder *rangeEncoder, UInt32 symbol)
+  {
+    UInt32 modelIndex = 1;
+    for (int bitIndex = NumBitLevels; bitIndex != 0 ;)
+    {
+      bitIndex--;
+      UInt32 bit = (symbol >> bitIndex) & 1;
+      Models[modelIndex].Encode(rangeEncoder, bit);
+      modelIndex = (modelIndex << 1) | bit;
+    }
+  };
+  void ReverseEncode(CEncoder *rangeEncoder, UInt32 symbol)
+  {
+    UInt32 modelIndex = 1;
+    for (int i = 0; i < NumBitLevels; i++)
+    {
+      UInt32 bit = symbol & 1;
+      Models[modelIndex].Encode(rangeEncoder, bit);
+      modelIndex = (modelIndex << 1) | bit;
+      symbol >>= 1;
+    }
+  }
+  UInt32 GetPrice(UInt32 symbol) const
+  {
+    symbol |= (1 << NumBitLevels);
+    UInt32 price = 0;
+    while (symbol != 1)
+    {
+      price += Models[symbol >> 1].GetPrice(symbol & 1);
+      symbol >>= 1;
+    }
+    return price;
+  }
+  UInt32 ReverseGetPrice(UInt32 symbol) const
+  {
+    UInt32 price = 0;
+    UInt32 modelIndex = 1;
+    for (int i = NumBitLevels; i != 0; i--)
+    {
+      UInt32 bit = symbol & 1;
+      symbol >>= 1;
+      price += Models[modelIndex].GetPrice(bit);
+      modelIndex = (modelIndex << 1) | bit;
+    }
+    return price;
+  }
+};
+
+template <int numMoveBits, int NumBitLevels>
+class CBitTreeDecoder
+{
+  CBitDecoder<numMoveBits> Models[1 << NumBitLevels];
+public:
+  void Init()
+  {
+    for(UInt32 i = 1; i < (1 << NumBitLevels); i++)
+      Models[i].Init();
+  }
+  UInt32 Decode(CDecoder *rangeDecoder)
+  {
+    UInt32 modelIndex = 1;
+    RC_INIT_VAR
+    for(int bitIndex = NumBitLevels; bitIndex != 0; bitIndex--)
+    {
+      // modelIndex = (modelIndex << 1) + Models[modelIndex].Decode(rangeDecoder);
+      RC_GETBIT(numMoveBits, Models[modelIndex].Prob, modelIndex)
+    }
+    RC_FLUSH_VAR
+    return modelIndex - (1 << NumBitLevels);
+  };
+  UInt32 ReverseDecode(CDecoder *rangeDecoder)
+  {
+    UInt32 modelIndex = 1;
+    UInt32 symbol = 0;
+    RC_INIT_VAR
+    for(int bitIndex = 0; bitIndex < NumBitLevels; bitIndex++)
+    {
+      // UInt32 bit = Models[modelIndex].Decode(rangeDecoder);
+      // modelIndex <<= 1;
+      // modelIndex += bit;
+      // symbol |= (bit << bitIndex);
+      RC_GETBIT2(numMoveBits, Models[modelIndex].Prob, modelIndex, ; , symbol |= (1 << bitIndex))
+    }
+    RC_FLUSH_VAR
+    return symbol;
+  }
+};
+
+template <int numMoveBits>
+void ReverseBitTreeEncode(CBitEncoder<numMoveBits> *Models, 
+    CEncoder *rangeEncoder, int NumBitLevels, UInt32 symbol)
+{
+  UInt32 modelIndex = 1;
+  for (int i = 0; i < NumBitLevels; i++)
+  {
+    UInt32 bit = symbol & 1;
+    Models[modelIndex].Encode(rangeEncoder, bit);
+    modelIndex = (modelIndex << 1) | bit;
+    symbol >>= 1;
+  }
+}
+
+template <int numMoveBits>
+UInt32 ReverseBitTreeGetPrice(CBitEncoder<numMoveBits> *Models, 
+    UInt32 NumBitLevels, UInt32 symbol)
+{
+  UInt32 price = 0;
+  UInt32 modelIndex = 1;
+  for (int i = NumBitLevels; i != 0; i--)
+  {
+    UInt32 bit = symbol & 1;
+    symbol >>= 1;
+    price += Models[modelIndex].GetPrice(bit);
+    modelIndex = (modelIndex << 1) | bit;
+  }
+  return price;
+}
+
+template <int numMoveBits>
+UInt32 ReverseBitTreeDecode(CBitDecoder<numMoveBits> *Models, 
+    CDecoder *rangeDecoder, int NumBitLevels)
+{
+  UInt32 modelIndex = 1;
+  UInt32 symbol = 0;
+  RC_INIT_VAR
+  for(int bitIndex = 0; bitIndex < NumBitLevels; bitIndex++)
+  {
+    // UInt32 bit = Models[modelIndex].Decode(rangeDecoder);
+    // modelIndex <<= 1;
+    // modelIndex += bit;
+    // symbol |= (bit << bitIndex);
+    RC_GETBIT2(numMoveBits, Models[modelIndex].Prob, modelIndex, ; , symbol |= (1 << bitIndex))
+  }
+  RC_FLUSH_VAR
+  return symbol;
+}
+
+}}
+
+#endif