4.44 beta

CPP/7zip/Compress/Implode/ImplodeHuffmanDecoder.h

@@ -0,0 +1,33 @@
+// ImplodeHuffmanDecoder.h
+
+#ifndef __IMPLODE_HUFFMAN_DECODER_H
+#define __IMPLODE_HUFFMAN_DECODER_H
+
+#include "../../Common/LSBFDecoder.h"
+#include "../../Common/InBuffer.h"
+
+namespace NCompress {
+namespace NImplode {
+namespace NHuffman {
+
+const int kNumBitsInLongestCode = 16;
+
+typedef NStream::NLSBF::CDecoder<CInBuffer> CInBit;
+
+class CDecoder
+{
+  UInt32 m_Limitits[kNumBitsInLongestCode + 2]; // m_Limitits[i] = value limit for symbols with length = i 
+  UInt32 m_Positions[kNumBitsInLongestCode + 2];   // m_Positions[i] = index in m_Symbols[] of first symbol with length = i 
+  UInt32 m_NumSymbols; // number of symbols in m_Symbols
+  UInt32 *m_Symbols; // symbols: at first with len=1 then 2, ... 15.
+public:
+  CDecoder(UInt32 numSymbols);
+  ~CDecoder();
+  
+  bool SetCodeLengths(const Byte *codeLengths);
+  UInt32 DecodeSymbol(CInBit *inStream);
+};
+
+}}}
+
+#endif