/*

* Copyright (c) 1997-2009 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:

*

*/

#ifndef __CDCCONTROLINTERFACEREADER_H__

#define __CDCCONTROLINTERFACEREADER_H__

#include <e32base.h>

#include "RequestHeader.h"

#include "acmcapability.h"

class MCdcCommsClassRequestHandler;

class RDevUsbcClient;

NONSHARABLE_CLASS(CCdcControlInterfaceReader) : public CActive

/**

 * Deals with reading control information from the LDD.

 */

	{

public:

	static CCdcControlInterfaceReader* NewL(

		MCdcCommsClassRequestHandler& aParent, 

		RDevUsbcClient& aLdd);

	~CCdcControlInterfaceReader();

private:

	CCdcControlInterfaceReader(MCdcCommsClassRequestHandler& aParent, 

		RDevUsbcClient& aLdd);

private: // utility

	void HandleReadCompletion(TInt aError);

	void DecodeMessageHeader();

	void DecodeMessageDataWithResponseRequired();

	void DecodeMessageData();

	void ReadMessageHeader();

	void ReadMessageData(TUint aLength);

private: // from CActive

	void RunL();

	void DoCancel();

private: // unowned

	MCdcCommsClassRequestHandler& iParent;

	RDevUsbcClient& iLdd;			

private: // owned

	TBuf8<KUsbRequestHdrSize> iMessageHeader; ///< Raw message header

	enum

		{

		KAcmControlReadBufferLength = 256, ///< Size of the ACM control read 

		///< buffer

		// Request IDs- see p16 of UBSCDC1.1 Table 4.

		KGetEncapsulated = 0x01, ///< GET_ENCAPSULATED_RESPONSE

		KGetCommFeature  = 0x03, ///< GET_COMM_FEATURE

		KGetLineCoding	 = 0x21, ///< GET_LINE_CODING

		KSendEncapsulated	 = 0x00, ///< SEND_ENCAPSULATED_COMMAND

		KSetCommFeature 	 = 0x02, ///< SET_COMM_FEATURE

		KClearCommFeature	 = 0x04, ///< CLEAR_COMM_FEATURE

		KSetLineCoding		 = 0x20, ///< SET_LINE_CODING

		KSetControlLineState = 0x22, ///< SET_CONTROL_LINE_STATE

		KSendBreak			 = 0x23, ///< SEND_BREAK

		};

	enum TReaderState

		{

		EWaitingForHeader = 0,	///< Waiting for message header

		EWaitingForData = 1,	///< Waiting for message data

		};

	TBuf8<KAcmControlReadBufferLength> iMessageData;	///< Message data

	///< Decoded message header

	TUsbRequestHdr iRequestHeader;						

	TReaderState iState;								///< Reader state

	};

#endif // __CDCCONTROLINTERFACEREADER_H__