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1 /* |
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2 * Copyright (c) 2002-2005 Nokia Corporation and/or its subsidiary(-ies). |
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3 * All rights reserved. |
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4 * This component and the accompanying materials are made available |
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5 * under the terms of "Eclipse Public License v1.0" |
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6 * which accompanies this distribution, and is available |
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7 * at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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8 * |
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9 * Initial Contributors: |
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10 * Nokia Corporation - initial contribution. |
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11 * |
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12 * Contributors: |
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13 * |
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14 * Description: Extracts a bits from byte row. |
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15 * |
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16 */ |
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17 |
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18 |
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19 |
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20 #ifndef TSATBITOP_H |
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21 #define TSATBITOP_H |
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22 |
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23 // INCLUDES |
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24 #include <e32std.h> |
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25 |
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26 // CLASS DECLARATION |
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27 |
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28 /** |
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29 * Bit manipulations |
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30 * |
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31 * @lib SatEngine.lib |
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32 * @since 2.6 |
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33 */ |
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34 class TSatBitOP |
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35 { |
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36 public: // New functions |
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37 |
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38 /** |
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39 * Extracts bits from byte row. |
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40 * Following assumptions is made about parameters: |
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41 * aBitCount is 1 to 8. |
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42 * @param aBitIndex Index to bit, where extraction starts. Index of |
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43 * MSB from aBytes[0] is 0. |
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44 * @param aBitCount Number of extracted bits. |
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45 * @param aBytes Array of bytes where bits are extracted. |
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46 * @return Value of extracted bits. |
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47 */ |
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48 static TUint8 ExtractBits( |
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49 TInt aBitIndex, |
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50 TUint8 aBitCount, |
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51 const TDesC8& aBytes ); |
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52 |
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53 /** |
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54 * Creates a mask of ones, starting from aBitIndex |
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55 * to aBitIndex + aCount. |
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56 * if aMSB is 5 and aCount is 2 then the mask would be |
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57 * 0011 0000. |
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58 * @param aBitIndex. 0 means MSB and 7 is LSB. |
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59 * @param aCount 1 to 8. |
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60 * @return Mask. |
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61 */ |
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62 static TUint8 CreateMask8Bit( |
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63 TUint8 aBitIndex, |
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64 TUint8 aCount ); |
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65 |
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66 /** |
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67 * Creates a mask of ones, starting from aBitIndex to aBitIndex + |
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68 * aCount. |
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69 * @param aBitIndex 0 means MSB and 15 means LSB. |
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70 * @param aCount 1 to 16. |
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71 * @return Mask of ones. |
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72 */ |
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73 static TUint16 CreateMask16Bit( |
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74 TUint8 aBitIndex, |
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75 TUint8 aCount ); |
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76 |
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77 }; |
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78 |
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79 #endif // TSATBITOP_H |
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80 |
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81 // End of File |