--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crashanalysercmd/PerfToolsSharedLibraries/Engine/SymbianNativeTools/Include/huffman.h	Thu Feb 11 15:50:58 2010 +0200
@@ -0,0 +1,160 @@
+/*
+* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+* 
+* Description:
+*
+*/
+
+#ifndef __HUFFMAN_H__
+#define __HUFFMAN_H__
+
+#include "e32defwrap.h"
+#include <fstream>
+
+
+
+/**
+Base class for E32Image Compression Errors.
+@internalComponent
+@released
+*/
+class E32ImageCompressionError
+{
+    public:
+        enum
+            {
+		    HUFFMANBUFFEROVERFLOWERROR = -1,
+            HUFFMANBUFFERUNDERFLOWERROR = -2,
+		    HUFFMANTOOMANYCODESERROR = -3,
+		    HUFFMANINVALIDCODINGERROR = -4,
+            };
+	public:
+		E32ImageCompressionError(int aError)
+            {
+            iError = aError;
+            }
+
+    public:
+        int iError;
+};
+
+
+
+/**
+Class for Bit input stream.
+Good for reading bit streams for packed, compressed or huffman data algorithms.
+@since 8.0
+@library euser.lib
+@internalComponent
+@released
+*/
+class TBitInput
+{
+	public:
+		TBitInput();
+		TBitInput(const TUint8* aPtr, TInt aLength, TInt aOffset=0);
+		void Set(const TUint8* aPtr, TInt aLength, TInt aOffset=0);
+		TUint ReadL();
+		TUint ReadL(TInt aSize);
+		TUint HuffmanL(const TUint32* aTree);
+	private:
+		virtual void UnderflowL();
+	private:
+		TInt iCount;
+		TUint iBits;
+		TInt iRemain;
+		const TUint32* iPtr;
+};
+
+/**
+Class derived from TBitInput
+@internalComponent
+@released
+*/
+class TFileInput : public TBitInput
+{
+	public:
+		TFileInput(unsigned char* source,int size);
+		~TFileInput();
+	private:
+		void UnderflowL();
+	private:
+		TUint8* iReadBuf;
+		TInt iSize;
+};
+/*
+Class for Huffman code toolkit.
+
+This class builds a huffman encoding from a frequency table and builds a decoding tree from a
+code-lengths table.
+
+The encoding generated is based on the rule that given two symbols s1 and s2, with code
+length l1 and l2, and huffman codes h1 and h2:
+	if l1<l2 then h1<h2 when compared lexicographically
+	if l1==l2 and s1<s2 then h1<h2 ditto
+
+This allows the encoding to be stored compactly as a table of code lengths
+
+@since 8.0
+@library euser.lib
+@internalComponent
+@released
+*/
+class Huffman
+{
+	public:
+		enum {KMaxCodeLength=27};
+		enum {KMetaCodes=KMaxCodeLength+1};
+		enum {KMaxCodes=0x8000};
+	public:
+		static void HuffmanL(const TUint32 aFrequency[],TInt aNumCodes,TUint32 aHuffman[]);
+		static void Encoding(const TUint32 aHuffman[],TInt aNumCodes,TUint32 aEncodeTable[]);
+		static TBool IsValid(const TUint32 aHuffman[],TInt aNumCodes);
+		static void Decoding(const TUint32 aHuffman[],TInt aNumCodes,TUint32 aDecodeTree[],TInt aSymbolBase=0);
+		static void InternalizeL(TBitInput& aInput,TUint32 aHuffman[],TInt aNumCodes);
+};
+
+// local definitions used for Huffman code generation
+typedef TUint16 THuff;		/** @internal */
+const THuff KLeaf=0x8000;	/** @internal */
+struct TNode
+/** @internal */
+{
+	TUint iCount;
+	THuff iLeft;
+	THuff iRight;
+};
+
+const TInt KDeflateLengthMag=8;
+const TInt KDeflateDistanceMag=12;
+
+/**
+class for TEncoding
+@internalComponent
+@released
+*/
+class TEncoding
+{
+	public:
+		enum {ELiterals=256,ELengths=(KDeflateLengthMag-1)*4,ESpecials=1,EDistances=(KDeflateDistanceMag-1)*4};
+		enum {ELitLens=ELiterals+ELengths+ESpecials};
+		enum {EEos=ELiterals+ELengths};
+	public:
+		TUint32 iLitLen[ELitLens];
+		TUint32 iDistance[EDistances];
+};
+
+const TInt KDeflationCodes=TEncoding::ELitLens+TEncoding::EDistances;
+
+#endif
+