author | Matti Laitinen <matti.t.laitinen@nokia.com> |
Thu, 11 Feb 2010 15:50:58 +0200 | |
changeset 0 | 818e61de6cd1 |
permissions | -rw-r--r-- |
0
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/* |
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). |
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* All rights reserved. |
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* This component and the accompanying materials are made available |
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* under the terms of "Eclipse Public License v1.0" |
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* which accompanies this distribution, and is available |
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* at the URL "http://www.eclipse.org/legal/epl-v10.html". |
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* |
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* Initial Contributors: |
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* Nokia Corporation - initial contribution. |
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* |
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* Contributors: |
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* |
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* Description: |
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* |
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*/ |
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using System; |
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using System.Collections.Generic; |
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using System.Text; |
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using System.IO; |
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using SymbianUtils.Tracer; |
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using SymbianUtils.Streams; |
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using SymbianStructuresLib.Uids; |
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using SymbianStructuresLib.Version; |
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|
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namespace SymbianImageLib.ROFS.Structures |
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{ |
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internal class TRofsDir : IEnumerable<TRofsEntry> |
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{ |
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#region Constructors |
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public TRofsDir( string aName, uint aFileAddress, SymbianStreamReaderLE aReader, ITracer aTracer ) |
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{ |
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//aTracer.Trace( "[Dir ] @ 0x{0:x8} {1}", aFileAddress, aName ); |
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// |
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iName = aName; |
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// |
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aReader.Seek( aFileAddress, SeekOrigin.Begin ); |
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// |
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iStructSize = aReader.ReadUInt16(); |
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iPadding = aReader.ReadUInt8(); |
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iFirstEntryOffset = aReader.ReadUInt8(); |
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iFileBlockAddress = aReader.ReadUInt32(); |
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iFileBlockSize = aReader.ReadUInt32(); |
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// |
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if ( iFileBlockAddress != 0 ) |
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{ |
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// Directory has files in it |
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AddFiles( aReader, aTracer, iFileBlockAddress, iFileBlockSize ); |
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} |
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if ( iStructSize > KMinimumDirectoryEntrySize ) |
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{ |
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// Directory has subdirectories |
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AddSubDirs( aReader, aTracer, aFileAddress + iStructSize ); |
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} |
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} |
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#endregion |
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|
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#region API |
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#endregion |
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|
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#region Constants |
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// The minimum standard entry size, irrespective of whether the directory |
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// contains subdirs or files. |
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public const uint KMinimumDirectoryEntrySize = 2 + 1 + 1 + 4 + 4; |
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#endregion |
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|
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#region Properties |
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public uint Size |
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{ |
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get { return iStructSize; } |
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} |
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public string Name |
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{ |
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get { return iName; } |
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} |
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public uint FirstEntryOffset |
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{ |
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get { return iFirstEntryOffset; } |
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} |
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public uint FileBlockAddress |
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{ |
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get { return iFileBlockAddress; } |
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} |
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public uint FileBlockSize |
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{ |
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get { return iFileBlockSize; } |
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} |
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public TRofsDir[] SubDirectories |
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{ |
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get |
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{ |
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return iSubdirectories.ToArray(); |
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} |
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} |
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#endregion |
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#region Internal methods |
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private void AddFiles( SymbianStreamReaderLE aReader, ITracer aTracer, long aStartPosition, uint aSize ) |
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{ |
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long originalPosition = aReader.Position; |
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long endPos = aStartPosition + aSize; |
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// |
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long filePosition = aStartPosition; |
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while ( filePosition < endPos ) |
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110 |
{ |
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111 |
// Seek to start of file and read it |
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112 |
aReader.Seek( filePosition, SeekOrigin.Begin ); |
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113 |
TRofsEntry entry = new TRofsEntry( aReader, aTracer ); |
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114 |
iFiles.Add( entry ); |
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//aTracer.Trace( "[File] @ 0x{0:x8} {1:d8} {2}", filePosition, entry.FileSize, entry.Name ); |
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116 |
|
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117 |
// Move to next file |
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118 |
filePosition += entry.Size; |
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119 |
} |
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120 |
|
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121 |
// Restore original position |
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122 |
aReader.Seek( originalPosition, SeekOrigin.Begin ); |
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123 |
} |
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124 |
|
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125 |
private void AddSubDirs( SymbianStreamReaderLE aReader, ITracer aTracer, long aEndDirPos ) |
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126 |
{ |
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127 |
long originalPosition = aReader.Position; |
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128 |
// |
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129 |
long filePosition = aReader.BaseStream.Position; |
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130 |
while ( filePosition < aEndDirPos ) |
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131 |
{ |
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132 |
// Seek to start of subdir and read basic properties |
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133 |
aReader.Seek( filePosition, SeekOrigin.Begin ); |
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TRofsEntry entry = new TRofsEntry( aReader, aTracer ); |
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135 |
|
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136 |
// Create a new subdirectory that we'll process recursively. |
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TRofsDir subdir = new TRofsDir( entry.Name, entry.FileAddress, aReader, aTracer ); |
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138 |
iSubdirectories.Add( subdir ); |
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139 |
|
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140 |
// Move to next subdir, rounding to 4 bytes |
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141 |
long nextSubDirOffset = entry.Size; |
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nextSubDirOffset += ( ( 4 - nextSubDirOffset ) & 0x3 ); |
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filePosition += nextSubDirOffset; |
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144 |
} |
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145 |
|
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146 |
// Restore original position |
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147 |
aReader.Seek( originalPosition, SeekOrigin.Begin ); |
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148 |
} |
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149 |
#endregion |
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150 |
|
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151 |
#region From IEnumerable<TRofsEntry> |
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152 |
public IEnumerator<TRofsEntry> GetEnumerator() |
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153 |
{ |
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154 |
foreach ( TRofsEntry entry in iFiles ) |
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155 |
{ |
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156 |
yield return entry; |
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157 |
} |
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158 |
} |
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159 |
|
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160 |
System.Collections.IEnumerator System.Collections.IEnumerable.GetEnumerator() |
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161 |
{ |
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162 |
foreach ( TRofsEntry entry in iFiles ) |
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163 |
{ |
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164 |
yield return entry; |
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165 |
} |
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166 |
} |
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167 |
#endregion |
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168 |
|
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169 |
#region Data members |
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170 |
private readonly string iName; |
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171 |
private ushort iStructSize; // Total size of this directory block including padding |
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172 |
private byte iPadding; |
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173 |
private byte iFirstEntryOffset; // offset to first entry |
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174 |
private uint iFileBlockAddress; // address of associated file block |
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175 |
private uint iFileBlockSize; // size of associated file block |
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176 |
|
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177 |
private List<TRofsEntry> iFiles = new List<TRofsEntry>(); |
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178 |
private List<TRofsDir> iSubdirectories = new List<TRofsDir>(); |
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179 |
#endregion |
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180 |
} |
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181 |
} |