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1 /* |
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2 * Copyright (c) 2009 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: |
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15 * |
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16 */ |
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17 using System; |
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18 using System.Collections.Generic; |
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19 using System.Text; |
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20 |
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21 namespace SymbianUtils.BasicTypes |
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22 { |
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23 public class SymAddressWithKnownBits : SymAddress |
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24 { |
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25 #region Constructors |
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26 public SymAddressWithKnownBits() |
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27 : this( 0 ) |
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28 { |
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29 } |
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30 |
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31 public SymAddressWithKnownBits( uint aAddress ) |
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32 : base( aAddress ) |
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33 { |
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34 } |
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35 #endregion |
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36 |
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37 #region API |
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38 public void SetKnownAddressBits( uint aAddress, int aNumberOfValidBits ) |
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39 { |
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40 // First build a bit mask of all the bits which we want to keep |
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41 // from the currently maintained address. |
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42 uint mask = 0; |
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43 for ( int i = 31; i >= aNumberOfValidBits; i-- ) |
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44 { |
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45 mask |= (uint) ( 1u << i ); |
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46 } |
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47 |
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48 // aNumberOfValidBits = 0xe |
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49 // mask is 0xffffc000 |
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50 // base.Address is 0x802e20ac |
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51 |
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52 // 11111111 11111111 11000000 00000000 = mask |
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53 // 10000000 00101110 01100110 10101100 |
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54 // 10000000 00101110 01000000 00000000 |
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55 |
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56 // Next, we want to apply that mask to the current address |
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57 // in order to prepare for the new values. |
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58 // |
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59 // I.e. preserve any bits we know but aren't changing, and then |
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60 // clear all other bits that we're about to set below. |
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61 base.Address &= mask; |
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62 |
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63 // Now we can merge in the new bits |
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64 base.Address |= aAddress; |
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65 |
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66 // Save how many valid bits of the address we currently have for debugging |
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67 // purposes |
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68 iKnownBits = Math.Max( iKnownBits, aNumberOfValidBits ); |
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69 System.Diagnostics.Debug.Assert( iKnownBits >= 0 && iKnownBits <= 32 ); |
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70 } |
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71 #endregion |
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72 |
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73 #region Properties |
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74 public int KnownBits |
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75 { |
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76 get { return iKnownBits; } |
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77 set { iKnownBits = value; } |
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78 } |
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79 |
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80 public bool IsKnown |
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81 { |
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82 get { return iKnownBits == 32; } |
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83 } |
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84 |
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85 public bool IsPartial |
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86 { |
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87 get { return iKnownBits > 0; } |
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88 } |
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89 |
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90 public bool IsUnknown |
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91 { |
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92 get { return iKnownBits == 0; } |
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93 } |
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94 |
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95 public override string AddressBinary |
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96 { |
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97 get |
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98 { |
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99 string ret = SymBitUtils.BeautifyBits( base.Address, iKnownBits ); |
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100 return ret; |
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101 } |
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102 } |
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103 |
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104 public override string AddressHex |
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105 { |
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106 get |
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107 { |
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108 // Work out how many nibbles we have |
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109 int validNibbles = 0; |
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110 for ( ; validNibbles < iKnownBits; validNibbles += 4 ) |
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111 { |
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112 } |
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113 validNibbles /= 4; // Convert bits to nibbles |
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114 int invalidNibbles = 8 - validNibbles; |
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115 |
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116 StringBuilder text = new StringBuilder(); |
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117 text.Append( string.Empty.PadLeft( invalidNibbles, '?' ) ); |
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118 text.Append( base.Address.ToString( string.Format( "x{0}", validNibbles ) ) ); |
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119 text.Length = Math.Min( 8, text.Length ); |
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120 return text.ToString(); |
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121 } |
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122 } |
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123 #endregion |
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124 |
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125 #region Operators |
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126 public static implicit operator uint( SymAddressWithKnownBits aAddress ) |
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127 { |
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128 return aAddress.Address; |
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129 } |
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130 #endregion |
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131 |
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132 #region Internal methods |
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133 #endregion |
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134 |
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135 #region Data members |
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136 private int iKnownBits = 0; |
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137 #endregion |
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138 } |
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139 } |