/*

* Copyright (c) 2010 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:

* header file of class for read and write data from share chunk LDD 

*

*/

/**

@file

@internalComponent

*/

#ifndef NCMCOMMINTERFACESENDERANDRECEIVER_H

#define NCMCOMMINTERFACESENDERANDRECEIVER_H

#include <e32base.h>

#ifndef __OVER_DUMMYUSBSCLDD__

#include <d32usbcsc.h>

#else

#include <dummyusbsclddapi.h>

#endif

class CNcmCommunicationInterface;

/**

Responsible for sending and receiving data on Control Endpoint

*/

NONSHARABLE_CLASS(CNcmCommInterfaceSenderAndReceiver) : public CActive

    {

public:

    static CNcmCommInterfaceSenderAndReceiver* NewL(RDevUsbcScClient& aPort, CNcmCommunicationInterface& aCommInterface);

    ~CNcmCommInterfaceSenderAndReceiver();

    void Start();

    void Stop();

    /**

    * read aLength data from LDD

    *

    * @param aStatus complete status for this request.

    * @param aBuf buffer to store data.    

    * @param aLength length to read.    

    */

    TInt Read(TRequestStatus& aStatus, TDes8& aBuf, TInt aLength);

    /**

    * write aLength data to LDD

    *

    * @param aStatus complete status for this request.

    * @param aBuf buffer of data.    

    * @param aLength length to write.    

    */

    TInt Write(TRequestStatus& aStatus, TDesC8& aBuf, TInt aLength);

private:

    enum TNcmControlEndpointState

        {

        EUnInit = 1,

        EIdle,

        EReceiving,

        ESending        

        };

    CNcmCommInterfaceSenderAndReceiver(RDevUsbcScClient& aPort, CNcmCommunicationInterface& aCommInterface);

    void ReadData();

private:

    /**

    *  derived from CActive

    */

    void RunL();

    void DoCancel();

private:

    RDevUsbcScClient&               iPort;

    /**

    *  LDD control endpoint buffer

    */

    TEndpointBuffer                 iEp0Buffer;

    CNcmCommunicationInterface&     iCommInterface;

    /**

    *  point to buffer to store data of Read function, this is not ownership

    */

    TDes8*                          iReceiveBuf;

    /**

    *  length of data left to be read from LDD for a Read request

    */

    TInt                            iToReceiveLength;

    /**

    *  complete status for Read and Write function, this is not ownership

    */

    TRequestStatus*                 iCompleteStatus;

    TNcmControlEndpointState        iState;

    };

#endif //NCMCOMMINTERFACESENDERANDRECEIVER_H