1 files changed, 75 insertions, 0 deletions
diff --git a/hostTools/lzma/decompress/LenCoder.h b/hostTools/lzma/decompress/LenCoder.h
new file mode 100644
index 0000000..40552b8
--- /dev/null
+++ b/hostTools/lzma/decompress/LenCoder.h
@@ -0,0 +1,75 @@
+#ifndef __LENCODER_H
+#define __LENCODER_H
+
+#include "BitTreeCoder.h"
+
+
+#define kNumPosStatesBitsMax 4
+#define kNumPosStatesMax 16
+
+
+#define kNumPosStatesBitsEncodingMax 4
+#define kNumPosStatesEncodingMax 16
+
+
+//#define kNumMoveBits 5
+
+#define kNumLenBits 3
+#define kNumLowSymbols (1 << kNumLenBits)
+
+#define kNumMidBits 3
+#define kNumMidSymbols (1 << kNumMidBits)
+
+#define kNumHighBits 8
+
+#define kNumSymbolsTotal (kNumLowSymbols + kNumMidSymbols + (1 << kNumHighBits))
+
+typedef struct LenDecoder
+{
+  CBitDecoder       m_Choice;
+  CBitDecoder       m_Choice2;
+  CBitTreeDecoder   m_LowCoder[kNumPosStatesMax];
+  CBitTreeDecoder   m_MidCoder[kNumPosStatesMax];
+  CBitTreeDecoder   m_HighCoder; 
+  UINT32            m_NumPosStates;
+} LenDecoder;
+
+INLINE void LenDecoderCreate(LenDecoder *lenCoder, UINT32 aNumPosStates)
+  { 
+    lenCoder->m_NumPosStates = aNumPosStates; 
+  }
+
+INLINE void LenDecoderInit(LenDecoder *lenCoder)
+  {
+    UINT32 aPosState;
+    BitDecoderInit(&lenCoder->m_Choice);
+    for (aPosState = 0; aPosState < lenCoder->m_NumPosStates; aPosState++)
+    {
+      BitTreeDecoderInit(&lenCoder->m_LowCoder[aPosState],kNumLenBits);
+      BitTreeDecoderInit(&lenCoder->m_MidCoder[aPosState],kNumMidBits);
+    }
+    BitTreeDecoderInit(&lenCoder->m_HighCoder,kNumHighBits);
+    BitDecoderInit(&lenCoder->m_Choice2);
+  }
+
+INLINE UINT32 LenDecode(ISequentialInStream *in_stream, LenDecoder *lenCoder, CRangeDecoder *aRangeDecoder, UINT32 aPosState)
+  {
+    if(BitDecode(in_stream, &lenCoder->m_Choice, aRangeDecoder) == 0)
+      return BitTreeDecode(in_stream, &lenCoder->m_LowCoder[aPosState],aRangeDecoder);
+    else
+    {
+      UINT32 aSymbol = kNumLowSymbols;
+      if(BitDecode(in_stream, &lenCoder->m_Choice2, aRangeDecoder) == 0)
+        aSymbol += BitTreeDecode(in_stream, &lenCoder->m_MidCoder[aPosState],aRangeDecoder);
+      else
+      {
+        aSymbol += kNumMidSymbols;
+        aSymbol += BitTreeDecode(in_stream, &lenCoder->m_HighCoder,aRangeDecoder);
+      }
+      return aSymbol;
+    }
+  }
+
+
+
+#endif