// Copyright (c) 2008-2009 Nokia Corporation and/or its subsidiary(-ies).

// All rights reserved.

// This component and the accompanying materials are made available

// under the terms of the License "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

 @internalTechnology

*/

#ifndef TBLOCKTRANSFER_H

#define TBLOCKTRANSFER_H

class MBlockTransferProtocol;

/**

Split the byte stream on block boundaries and transfer using

MBlockTransferProtocol interface in blocks

*/

class TBlockTransfer

    {

public:

    TBlockTransfer();

    void InitBuffers(RBuf8* aHeadbuf, RBuf8* aTailbuf);

    void ReadL(MBlockTransferProtocol& aProtocol,

               TPos aPosition,

               TInt aLength,

               TDes8& aBuf);

    void WriteL(MBlockTransferProtocol& aProtocol,

                TPos aPosition,

                TInt aLength,

                TDesC8& aBuf);

    TUint32 BlockLength() const;

    void SetCapacityL(TUint32 aBlockLength, TLba aLastLba);

private:

    TPos GetHeadBlockOffset(TPos aPos);

    TLba GetHeadBlockLbaL(TPos aPos);

    TPos GetTailBlockOffset(TPos aPos, TInt aLen);

    TLba GetTailBlockLbaL(TPos aPos, TInt aLen);

private:

    /** Block Length */

    TInt64 iBlockLength;

    /** Last Logical Block Address */

    TLba iLastLba;

    // buffers for block manipulation (not owend by this class)

    RBuf8* iHeadbuf;

	RBuf8* iTailbuf;

    };

/** Constructor */

inline TBlockTransfer::TBlockTransfer()

:   iBlockLength(0),

    iHeadbuf(NULL),

    iTailbuf(NULL)

    {

    }

/** return the Block Length */

inline TUint32 TBlockTransfer::BlockLength() const

    {

    return iBlockLength;

    }

inline void TBlockTransfer::InitBuffers(RBuf8* aHeadbuf, RBuf8* aTailbuf)

    {

    iHeadbuf = aHeadbuf;

    iTailbuf = aTailbuf;

    }

#endif // TBLOCKTRANSFER_H