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1 /* |
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2 * Copyright (c) 2004-2008 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 |
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18 using System; |
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19 using System.IO; |
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20 using System.Collections.Generic; |
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21 using System.Text; |
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22 using System.Threading; |
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23 using SymbianStructuresLib.Debug.Symbols; |
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24 using SymbianStructuresLib.Debug.Symbols.Interfaces; |
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25 using SymbianSymbolLib.SourceManagement.Source; |
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26 using SymbianSymbolLib.SourceManagement.Provisioning; |
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27 using SymbianUtils; |
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28 using SymbianUtils.Tracer; |
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29 using SymbianUtils.FileTypes; |
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30 using SymbianUtils.Threading; |
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31 using SLPluginSymbol.Source; |
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32 |
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33 namespace SLPluginSymbol.Data |
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34 { |
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35 internal class SymbolFileData : DisposableObject, IEnumerable<SymbolFileSegment> |
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36 { |
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37 #region Delegates & events |
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38 public delegate void DataPreparedHandler( SymbolFileData aData ); |
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39 public event DataPreparedHandler DataPrepared = delegate { }; |
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40 #endregion |
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41 |
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42 #region Constructors |
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43 public SymbolFileData( SymbolSource aSource ) |
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44 { |
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45 iSource = aSource; |
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46 iData = File.ReadAllBytes( aSource.URI ); |
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47 } |
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48 #endregion |
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49 |
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50 #region API |
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51 public void Split( int aSegmentCount ) |
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52 { |
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53 int chunkSize = (int) iData.Length / aSegmentCount; |
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54 int blockPosStart = 0; |
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55 int length = 0; |
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56 // |
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57 for ( int i = 0; i < aSegmentCount; i++ ) |
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58 { |
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59 int pos = 0; |
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60 int blockPosEnd = Math.Min( iData.Length - 1, blockPosStart + chunkSize ); |
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61 while ( pos >= 0 ) |
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62 { |
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63 pos = Array.IndexOf( iData, KPattern[ 0 ], blockPosEnd ); |
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64 if ( pos > 0 ) |
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65 { |
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66 if ( pos + 8 >= iData.Length ) |
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67 { |
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68 break; |
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69 } |
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70 else if ( pos + 8 < iData.Length && iData[ pos + 7 ] == KPattern[ 7 ] ) |
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71 { |
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72 bool isMatch = CompareByteArrays( KPattern, iData, pos ); |
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73 if ( isMatch ) |
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74 { |
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75 length = pos - blockPosStart; |
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76 //System.Diagnostics.Debug.WriteLine( string.Format( "Block {0:d2} @ 0x{1:x8}, length: {2:d8}", i, blockPosStart, length ) ); |
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77 // |
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78 iSegments.Add( new SymbolFileSegment( this, blockPosStart, length ) ); |
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79 blockPosStart = pos; |
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80 break; |
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81 } |
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82 else |
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83 { |
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84 // Didn't find a match, move forwards |
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85 blockPosEnd = pos + 1; |
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86 } |
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87 } |
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88 else |
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89 { |
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90 // Didn't find a match, move forwards |
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91 blockPosEnd = pos + 1; |
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92 } |
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93 } |
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94 else |
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95 { |
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96 // Searched to end of file and didn't find another block, so just create |
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97 // a new reader for everything that remains. |
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98 length = iData.Length - blockPosStart; |
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99 //System.Diagnostics.Debug.WriteLine( string.Format( "Block {0:d2} @ 0x{1:x8}, length: {2:d8}", i, blockPosStart, length ) ); |
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100 iSegments.Add( new SymbolFileSegment( this, blockPosStart, length ) ); |
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101 // |
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102 break; |
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103 } |
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104 } |
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105 } |
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106 |
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107 iCollectionIdentifier = new MultiThreadedProcessor<SymbolFileSegment>( this ); |
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108 } |
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109 |
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110 public void FindCollections() |
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111 { |
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112 System.Diagnostics.Debug.Assert( iCollectionIdentifier != null ); |
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113 iCollectionIdentifier.ProcessItem += new MultiThreadedProcessor<SymbolFileSegment>.ItemProcessor( CollectionIdentifier_ProcessItem ); |
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114 iCollectionIdentifier.EventHandler += new MultiThreadedProcessor<SymbolFileSegment>.ProcessorEventHandler( CollectionIdentifier_EventHandler ); |
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115 iCollectionIdentifier.Start( TSynchronicity.EAsynchronous ); |
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116 } |
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117 #endregion |
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118 |
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119 #region Properties |
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120 public SymbolSource Source |
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121 { |
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122 get { return iSource; } |
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123 } |
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124 #endregion |
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125 |
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126 #region Operators |
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127 public static implicit operator byte[]( SymbolFileData aData ) |
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128 { |
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129 return aData.iData; |
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130 } |
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131 #endregion |
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132 |
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133 #region Internal constants |
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134 private static readonly byte[] KPattern = new byte[] { (byte) 'F', (byte) 'r', (byte) 'o', (byte) 'm', (byte) ' ', (byte) ' ', (byte) ' ', (byte) ' ' }; |
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135 #endregion |
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136 |
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137 #region Event handlers |
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138 private void CollectionIdentifier_EventHandler( MultiThreadedProcessor<SymbolFileSegment>.TEvent aEvent ) |
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139 { |
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140 switch ( aEvent ) |
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141 { |
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142 default: |
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143 break; |
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144 case MultiThreadedProcessor<SymbolFileSegment>.TEvent.EEventStarting: |
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145 break; |
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146 case MultiThreadedProcessor<SymbolFileSegment>.TEvent.EEventCompleted: |
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147 iCollectionIdentifier.ProcessItem -= new MultiThreadedProcessor<SymbolFileSegment>.ItemProcessor( CollectionIdentifier_ProcessItem ); |
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148 iCollectionIdentifier.EventHandler -= new MultiThreadedProcessor<SymbolFileSegment>.ProcessorEventHandler( CollectionIdentifier_EventHandler ); |
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149 iCollectionIdentifier.Dispose(); |
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150 iCollectionIdentifier = null; |
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151 DataPrepared( this ); |
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152 break; |
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153 } |
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154 } |
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155 |
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156 private void CollectionIdentifier_ProcessItem( SymbolFileSegment aItem ) |
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157 { |
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158 aItem.PerformInitialCollectionIdentification(); |
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159 } |
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160 #endregion |
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161 |
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162 #region Internal methods |
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163 private static bool CompareByteArrays( byte[] aSearchFor, byte[] aSearchIn, int aStartPos ) |
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164 { |
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165 bool areEqual = true; |
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166 // |
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167 for ( int i = 0; i < aSearchFor.Length; i++ ) |
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168 { |
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169 byte c = aSearchFor[ i ]; |
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170 |
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171 int bigBufferIndex = aStartPos + i; |
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172 if ( bigBufferIndex > aSearchIn.Length ) |
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173 { |
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174 // We ran out of data |
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175 areEqual = false; |
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176 break; |
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177 } |
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178 else |
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179 { |
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180 byte b = aSearchIn[ bigBufferIndex ]; |
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181 if ( b != c ) |
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182 { |
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183 areEqual = false; |
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184 break; |
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185 } |
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186 } |
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187 } |
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188 // |
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189 return areEqual; |
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190 } |
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191 #endregion |
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192 |
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193 #region From IEnumerable<SymbolFileSegment> |
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194 public IEnumerator<SymbolFileSegment> GetEnumerator() |
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195 { |
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196 foreach( SymbolFileSegment segment in iSegments ) |
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197 { |
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198 yield return segment; |
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199 } |
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200 } |
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201 |
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202 System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() |
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203 { |
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204 foreach ( SymbolFileSegment segment in iSegments ) |
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205 { |
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206 yield return segment; |
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207 } |
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208 } |
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209 #endregion |
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210 |
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211 #region From DisposableObject |
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212 protected override void CleanupManagedResources() |
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213 { |
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214 try |
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215 { |
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216 base.CleanupManagedResources(); |
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217 } |
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218 finally |
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219 { |
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220 foreach ( SymbolFileSegment seg in iSegments ) |
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221 { |
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222 seg.Dispose(); |
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223 } |
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224 // |
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225 if ( iCollectionIdentifier != null ) |
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226 { |
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227 iCollectionIdentifier.Dispose(); |
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228 iCollectionIdentifier = null; |
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229 } |
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230 // |
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231 iSegments.Clear(); |
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232 iData = null; |
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233 } |
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234 } |
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235 #endregion |
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236 |
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237 #region Data members |
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238 private readonly SymbolSource iSource; |
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239 private byte[] iData = null; |
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240 private List<SymbolFileSegment> iSegments = new List<SymbolFileSegment>(); |
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241 private MultiThreadedProcessor<SymbolFileSegment> iCollectionIdentifier; |
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242 #endregion |
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243 } |
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244 } |