sl@0: // Copyright (c) 2008-2009 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 the License "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: /**
sl@0:  @file
sl@0:  @internalTechnology
sl@0: */
sl@0: 
sl@0: #ifndef TBLOCKTRANSFER_H
sl@0: #define TBLOCKTRANSFER_H
sl@0: 
sl@0: class MBlockTransferProtocol;
sl@0: 
sl@0: /**
sl@0: Split the byte stream on block boundaries and transfer using
sl@0: MBlockTransferProtocol interface in blocks
sl@0: */
sl@0: class TBlockTransfer
sl@0:     {
sl@0: public:
sl@0:     TBlockTransfer();
sl@0: 
sl@0:     void InitBuffers(RBuf8* aHeadbuf, RBuf8* aTailbuf);
sl@0: 
sl@0:     void ReadL(MBlockTransferProtocol& aProtocol,
sl@0:                TPos aPosition,
sl@0:                TInt aLength,
sl@0:                TDes8& aBuf);
sl@0: 
sl@0:     void WriteL(MBlockTransferProtocol& aProtocol,
sl@0:                 TPos aPosition,
sl@0:                 TInt aLength,
sl@0:                 TDesC8& aBuf);
sl@0: 
sl@0:     TUint32 BlockLength() const;
sl@0:     void SetCapacityL(TUint32 aBlockLength, TLba aLastLba);
sl@0: 
sl@0: private:
sl@0:     TPos GetHeadBlockOffset(TPos aPos);
sl@0:     TLba GetHeadBlockLbaL(TPos aPos);
sl@0: 
sl@0:     TPos GetTailBlockOffset(TPos aPos, TInt aLen);
sl@0:     TLba GetTailBlockLbaL(TPos aPos, TInt aLen);
sl@0: 
sl@0: private:
sl@0:     /** Block Length */
sl@0:     TInt64 iBlockLength;
sl@0:     /** Last Logical Block Address */
sl@0:     TLba iLastLba;
sl@0: 
sl@0:     // buffers for block manipulation (not owend by this class)
sl@0:     RBuf8* iHeadbuf;
sl@0: 	RBuf8* iTailbuf;
sl@0:     };
sl@0: 
sl@0: 
sl@0: /** Constructor */
sl@0: inline TBlockTransfer::TBlockTransfer()
sl@0: :   iBlockLength(0),
sl@0:     iHeadbuf(NULL),
sl@0:     iTailbuf(NULL)
sl@0:     {
sl@0:     }
sl@0: 
sl@0: 
sl@0: /** return the Block Length */
sl@0: inline TUint32 TBlockTransfer::BlockLength() const
sl@0:     {
sl@0:     return iBlockLength;
sl@0:     }
sl@0: 
sl@0: 
sl@0: inline void TBlockTransfer::InitBuffers(RBuf8* aHeadbuf, RBuf8* aTailbuf)
sl@0:     {
sl@0:     iHeadbuf = aHeadbuf;
sl@0:     iTailbuf = aTailbuf;
sl@0:     }
sl@0: 
sl@0: #endif // TBLOCKTRANSFER_H
sl@0: