1 /*

     2 * Copyright (c) 2003-2009 Nokia Corporation and/or its subsidiary(-ies).

     3 * All rights reserved.

     4 * This component and the accompanying materials are made available

     5 * under the terms of "Eclipse Public License v1.0"

     6 * which accompanies this distribution, and is available

     7 * at the URL "http://www.eclipse.org/legal/epl-v10.html".

     8 *

     9 * Initial Contributors:

    10 * Nokia Corporation - initial contribution.

    11 *

    12 * Contributors:

    13 *

    14 * Description:

    15 * Name        : Crc.h

    16 * Part of     : SigComp / misc

    17 * Interface   : 

    18 * Implementation of the CRC (PPP Frame Check Sequence)

    19 * Version     : 1.0

    20 *

    21 */

    22 

    23 

    24 

    25 

    26 /**

    27  @internalComponent

    28 */

    29 

    30 

    31 #ifndef CRC_H

    32 #define CRC_H

    33 

    34 //  INCLUDES

    35 #include <e32base.h>

    36 

    37 

    38 // CLASS DECLARATION

    39 

    40 /**

    41 *  @brief This class mplements Fast Frame Check computation,

    42 *         as described in RFC 1662, APPENDIX C.2

    43 *

    44 *  @lib sigcomp

    45 */

    46 

    47 class Crc

    48     {

    49 

    50     public:

    51 

    52         enum

    53             {

    54             /** initial value of crc sum */

    55             KFcsInit = 0xffff

    56             };

    57 

    58         /**

    59          * Calculate crc sum.

    60          *

    61          * @param aBuffer buffer with input data

    62          * @param aLength length of input data

    63          * @param aFcs initial value of sum

    64          *

    65          * @returns crc sum

    66          */

    67 

    68         static TUint16 Calc(const TUint8* aBuffer,

    69                             TUint aLength,

    70                             TUint16 aFcs = KFcsInit);

    71 

    72     };

    73 

    74 #endif

    75             

    76 // End of File