sl@0: // Copyright (c) 1998-2009 Nokia Corporation and/or its subsidiary(-ies).
sl@0: // All rights reserved.
sl@0: // This component and the accompanying materials are made available
sl@0: // under the terms of "Eclipse Public License v1.0"
sl@0: // which accompanies this distribution, and is available
sl@0: // at the URL "http://www.eclipse.org/legal/epl-v10.html".
sl@0: //
sl@0: // Initial Contributors:
sl@0: // Nokia Corporation - initial contribution.
sl@0: //
sl@0: // Contributors:
sl@0: //
sl@0: // Description:
sl@0: //
sl@0: 
sl@0: #if !defined(__S32HUF_H__)
sl@0: #define __S32HUF_H__
sl@0: #if !defined(__S32BUF_H__)
sl@0: #include <s32buf.h>
sl@0: #endif
sl@0: #if !defined(__S32STRM_H__)
sl@0: #include <s32strm.h>
sl@0: #endif
sl@0: 
sl@0: class Huffman // Huffman primitives: sell to base
sl@0: 	{
sl@0: public:
sl@0: 	IMPORT_C static const TUint* DefaultBits(); // long code needs to be sorted out
sl@0: 	IMPORT_C static const TUint8* DefaultTree(); // is there a real case for default tables?
sl@0: //
sl@0: 	IMPORT_C void Encode(...); // incremental encoding and decoding primitives
sl@0: 	IMPORT_C void Decode(...); // suitable for sharing between descriptors and filters
sl@0: 	};
sl@0: //
sl@0: class THufEncodeFilter : public TStreamFilter
sl@0: 	{
sl@0: public:
sl@0: 	IMPORT_C THufEncodeFilter();
sl@0: 	IMPORT_C void Set(MStreamBuf* aHost,const TUint* aHufBits,TInt aMode=EWrite);
sl@0: protected:
sl@0: 	IMPORT_C TInt Capacity(TInt aMaxLength);
sl@0: 	IMPORT_C TInt FilterL(TAny* aPtr,TInt aMaxLength,const TUint8*& aFrom,const TUint8* anEnd);
sl@0: 	IMPORT_C void DoSynchL();
sl@0: private:
sl@0: 	const TUint* iTable;
sl@0: 	TInt iMaxBits;
sl@0: 	TUint iOut;
sl@0: 	TInt iBit;
sl@0: 	};
sl@0: class THufDecodeFilter : public TStreamFilter
sl@0: 	{
sl@0: public:
sl@0: 	IMPORT_C THufDecodeFilter();
sl@0: 	IMPORT_C void Set(MStreamBuf* aHost,const TUint8* aHufTree,TInt aMode=ERead);
sl@0: protected:
sl@0: 	IMPORT_C TInt Capacity(TInt aMaxLength);
sl@0: 	IMPORT_C TInt FilterL(TAny* aPtr,TInt aMaxLength,const TUint8*& aFrom,const TUint8* anEnd);
sl@0: 	IMPORT_C void DoSynchL();
sl@0: private:
sl@0: 	const TUint8* iRoot;
sl@0: 	const TUint8* iNode;
sl@0: 	TUint iBits;
sl@0: 	};
sl@0: //
sl@0: class RHufDecodeReadStream : public RReadStream
sl@0: 	{
sl@0: public:
sl@0: 	RHufDecodeReadStream() {}
sl@0: 	IMPORT_C RHufDecodeReadStream(RReadStream& aHost,const TUint8* aHufTree=Huffman::DefaultTree());
sl@0: 	IMPORT_C void Open(RReadStream& aHost,const TUint8* aHufTree=Huffman::DefaultTree());
sl@0: private:
sl@0: 	THufDecodeFilter iFilter;
sl@0: 	};
sl@0: class RHufEncodeWriteStream : public RWriteStream
sl@0: 	{
sl@0: public:
sl@0: 	RHufEncodeWriteStream() {}
sl@0: 	inline RHufEncodeWriteStream(const MExternalizer<TStreamRef>& anExter);
sl@0: 	IMPORT_C RHufEncodeWriteStream(RWriteStream& aHost,const TUint* aHufBits=Huffman::DefaultBits());
sl@0: 	IMPORT_C void Open(RWriteStream& aHost,const TUint* aHufBits=Huffman::DefaultBits());
sl@0: private:
sl@0: 	THufEncodeFilter iFilter;
sl@0: 	};
sl@0: //
sl@0: class RHufEncodeReadStream : public RReadStream
sl@0: 	{
sl@0: public:
sl@0: 	RHufEncodeReadStream() {}
sl@0: 	IMPORT_C RHufEncodeReadStream(RReadStream& aHost,const TUint* aHufBits=Huffman::DefaultBits());
sl@0: 	IMPORT_C void Open(RReadStream& aHost,const TUint* aHufBits=Huffman::DefaultBits());
sl@0: private:
sl@0: 	THufEncodeFilter iFilter;
sl@0: 	};
sl@0: class RHufDecodeWriteStream : public RWriteStream
sl@0: 	{
sl@0: public:
sl@0: 	RHufDecodeWriteStream() {}
sl@0: 	inline RHufDecodeWriteStream(const MExternalizer<TStreamRef>& anExter);
sl@0: 	IMPORT_C RHufDecodeWriteStream(RWriteStream& aHost,const TUint8* aHufTree=Huffman::DefaultTree());
sl@0: 	IMPORT_C void Open(RWriteStream& aHost,const TUint8* aHufTree=Huffman::DefaultTree());
sl@0: private:
sl@0: 	THufDecodeFilter iFilter;
sl@0: 	};
sl@0: 
sl@0: #include "S32HUF.INL"
sl@0: #endif