1 /*

     2 * Copyright (c) 2002-2005 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:  Extracts a bits from byte row.

    15 *

    16 */

    17 

    18 

    19 

    20 #ifndef TSATBITOP_H

    21 #define TSATBITOP_H

    22 

    23 //  INCLUDES

    24 #include <e32std.h>

    25 

    26 // CLASS DECLARATION

    27 

    28 /**

    29 *  Bit manipulations

    30 *

    31 *  @lib SatEngine.lib

    32 *  @since 2.6

    33 */

    34 class TSatBitOP

    35     {

    36     public: // New functions

    37 

    38         /**

    39         * Extracts bits from byte row.

    40         * Following assumptions is made about parameters:

    41         *  aBitCount is 1 to 8.

    42         * @param aBitIndex Index to bit, where extraction starts. Index of

    43         * MSB from aBytes[0] is 0.

    44         * @param aBitCount Number of extracted bits.

    45         * @param aBytes Array of bytes where bits are extracted.

    46         * @return Value of extracted bits.

    47         */

    48         static TUint8 ExtractBits(

    49             TInt aBitIndex,

    50             TUint8 aBitCount,

    51             const TDesC8& aBytes );

    52 

    53         /**

    54         * Creates a mask of ones, starting from aBitIndex

    55         * to aBitIndex + aCount.

    56         * if aMSB is 5 and aCount is 2 then the mask would be

    57         * 0011 0000.

    58         * @param aBitIndex. 0 means MSB and 7 is LSB.

    59         * @param aCount 1 to 8.

    60         * @return Mask.

    61         */

    62         static TUint8 CreateMask8Bit(

    63             TUint8 aBitIndex,

    64             TUint8 aCount );

    65 

    66         /**

    67         * Creates a mask of ones, starting from aBitIndex to aBitIndex +

    68         * aCount.

    69         * @param aBitIndex 0 means MSB and 15 means LSB.

    70         * @param aCount 1 to 16.

    71         * @return Mask of ones.

    72         */

    73         static TUint16 CreateMask16Bit(

    74             TUint8 aBitIndex,

    75             TUint8 aCount );

    76 

    77     };

    78 

    79 #endif      // TSATBITOP_H

    80 

    81 // End of File