/**

* Copyright (c) 2003-2009 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:

*

*/

/**

 @file PREDCOMP.H 

 @internalComponent

*/

#ifndef __PREDCOMP_H__

#define __PREDCOMP_H__

#include <networking/pppccp.h>

#include "PREDLOG.H"

NONSHARABLE_CLASS(CPredCompFactory) : public CPppCompFactory

/**	

Factory base for creating a concrete instance of a CSSLBase

@internalComponent

*/

	{

public:

	CPredCompFactory();

	void InstallL();

	virtual CPppCompressor* NewPppCompressorL(CPppCcp* aCcp,TInt aMaxFrameLength,const TUint8* aMode = NULL);

	virtual CPppDeCompressor* NewPppDeCompressorL(CPppCcp* aCcp, TInt aMaxFrameLength,const TUint8* aMode = NULL);

	};

class TRFC1978Table

/**

Main RFC 1978 class that contains the guess table and the associated

RFC compress and decompress functions.

@internalComponent

*/

	{

protected:

	void CompressRFC1978(const TDesC8& aSrc,TDes8* aDest);

	void DecompressRFC1978(const TDesC8& aSrc,TDes8& aDest);

	void Reset(){iGuessTable.SetMax();iGuessTable.FillZ();iHash = 0;}

private:

	TBuf8<65536> iGuessTable;

	TUint16      iHash;

	inline void Hash(TUint16 aSrc);

	};

inline void TRFC1978Table::Hash(TUint16 aSrc)

	{

	iHash = (TUint16)((iHash << 4) ^aSrc);

	}

NONSHARABLE_CLASS(CPredCompressor) : public CPppCompressor , public TRFC1978Table	

/**

Compressor class contains main Compressor virtual plus support methods

Predictor-1 PPP compressor (RFC 1978)

@internalComponent

*/

	{

public:

	TPppCompressReturnValue Compress(RMBufChain& aPacket, TUint16 aPppId);

	TBool	ResetCompressor(TInt aLength, RMBufChain& aPacket);

	~CPredCompressor();

	CPredCompressor();

	void	ConstructL(CPredCompFactory* aFactory, CPppCcp* aCcp, TInt aMaxFrameLength);

private:

	TUint CopyFrameIntoFlatBuf(TPtr8& aDest,RMBufChain& aPacketQ, TUint16 aPppId);

private:

	HBufC8*			iCompressedBuffer;

	HBufC8*			iFrameBuffer;

	CPppCcp*		iCcp;

	};

NONSHARABLE_CLASS(CPredDeCompressor) : public CPppDeCompressor , public TRFC1978Table

/**

Predictor-1 PPP decompressor (RFC 1978)

@internalComponent

*/

	{

public:

	TBool	Decompress(RMBufQ& aBufferQ);

	void	ResetDecompressor(TInt aLength, RMBufChain& aPacket);

	~CPredDeCompressor();

	CPredDeCompressor();

	void	ConstructL(CPredCompFactory* aFactory, CPppCcp* aCcp, TInt aMaxFrameLength);

private:

	TUint CopyFrameIntoFlatBuf(const TPtr8& aPtr,RMBufQ& aBufferQ);

	TUint FlattenBuf(TPtr8& aPtr, RMBufQ& aBufferQ);

	TBool CopyNewFrameToChain(TDesC8& aSrc,RMBufQ& aBufferQ);

private:

	TBool			iReConfiguring;

	HBufC8*			iCompressedBuffer;

	HBufC8*			iDecompressBuffer;

	CPppCcp*		iCcp;

	};

extern "C"

    {

/**

Generates and returns a CPppCompFactory object.

This is the polymorphic DLL entry point.

@return New CPppCompFactory object

@internalTechnology

*/

	EXPORT_C CPppCompFactory* NewPppCompFactoryL(void);

	}

#endif