/*

* Copyright (c) 2004-2009 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: 

* Definition of the Swi::Sis::CCrc

*

*/

/**

 @file 

 @released

 @internalTechnology

*/

#ifndef __SISCRC_H__

#define __SISCRC_H__

#include "sisfield.h"

namespace Swi

{

namespace Sis

 {

/**

 * This class represents a Crc field, it can be either SisDataCrc or SisControllerCrc. 

 * It is described in SGL.GT0188.251.

 *

 * @released

 * @internalTechnology

 */

class CCrc : public CField

	{

public:

	/**

	 * This creates a new CCrc object and places it on the cleanup stack.

	 *

	 * @param aDataProvider		 An instance of a MSisDataProvider to read the entity from.

	 * @param aTypeReadBehaviour Whether we need to check the sis type or not.

	 *

	 * @return An instance of CCrc representing the data read.	 	

	 */

	static CCrc* NewLC(MSisDataProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour = EReadType);

	/**

	 * This creates a new CCrc object.

	 *

	 * @param aDataProvider		 An instance of a MSisDataProvider to read the entity from.

	 * @param aTypeReadBehaviour Whether we need to check the sis type or not.

	 *

	 * @return An instance of CCrc representing the data read.	 	 

	 */

	static CCrc* NewL(MSisDataProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour = EReadType);

	virtual ~CCrc();

public: // Business methods

	/**

	 * Accessor for the actual checksum. 

	 *

	 * @return The checksum data as a TUint16

	 */

	TUint16 Checksum() const;

private: // Life cycle methods

	CCrc();

	/**

	 * The second-phase constructor.

	 *

	 * @param aDataProvider      An instance of a MSisDataProvider to read the entity from.

	 * @param aTypeReadBehaviour Whether to check the field code or take it for granted.

	 *	 

	 */

	void ConstructL(MSisDataProvider& aDataProvider, TInt64& aBytesRead, TReadTypeBehaviour aTypeReadBehaviour);

private:

	TUint16 iChecksum;	

	};

inline TUint16 CCrc::Checksum() const

	{

	return iChecksum;

	}	

 } // namespace Sis

} // namespace Swi

#endif // __SISCRC_H__