/*

* Copyright (c) 2003-2009 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:

* Name        : Crc.h

* Part of     : SigComp / misc

* Interface   : 

* Implementation of the CRC (PPP Frame Check Sequence)

* Version     : 1.0

*

*/

/**

 @internalComponent

*/

#ifndef CRC_H

#define CRC_H

//  INCLUDES

#include <e32base.h>

// CLASS DECLARATION

/**

*  @brief This class mplements Fast Frame Check computation,

*         as described in RFC 1662, APPENDIX C.2

*

*  @lib sigcomp

*/

class Crc

    {

    public:

        enum

            {

            /** initial value of crc sum */

            KFcsInit = 0xffff

            };

        /**

         * Calculate crc sum.

         *

         * @param aBuffer buffer with input data

         * @param aLength length of input data

         * @param aFcs initial value of sum

         *

         * @returns crc sum

         */

        static TUint16 Calc(const TUint8* aBuffer,

                            TUint aLength,

                            TUint16 aFcs = KFcsInit);

    };

#endif

// End of File