// 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