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; |
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using SymbianUtils.Streams; |
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using SymbianImageLib.Common.Header; |
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using SymbianStructuresLib.Compression.Common; |
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|
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namespace SymbianImageLib.Common.Streams |
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{ |
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internal class SIStream : DisposableObject |
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{ |
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#region Enumerations |
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public enum TOwnershipType |
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{ |
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EOwned = 0, |
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EOwnedExternally |
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} |
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#endregion |
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|
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#region Constructors |
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public SIStream() |
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: this( null, TOwnershipType.EOwned ) |
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{ |
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} |
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|
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public SIStream( Stream aStream ) |
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: this( aStream, TOwnershipType.EOwned ) |
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{ |
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} |
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|
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public SIStream( Stream aStream, TOwnershipType aType ) |
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{ |
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SwitchStream( aStream, aType ); |
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} |
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#endregion |
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|
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#region Framework API |
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public virtual bool InRange( long aPosition ) |
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{ |
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bool ret = ( aPosition >= 0 && aPosition < this.Length ); |
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return ret; |
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} |
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|
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public virtual void Seek( long aPosition, SeekOrigin aOrigin ) |
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{ |
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iStream.Seek( aPosition, aOrigin ); |
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} |
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|
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public virtual int Read( byte[] aBuffer, int aOffset, int aCount ) |
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{ |
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int ret = iStream.Read( aBuffer, aOffset, aCount ); |
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return ret; |
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} |
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|
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public virtual void Write( byte[] aBuffer ) |
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{ |
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Write( aBuffer, 0, aBuffer.Length ); |
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} |
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|
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public virtual void Write( SIStream aFrom, int aCount ) |
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{ |
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Write( (Stream) aFrom, aCount ); |
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} |
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|
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public virtual void Write( Stream aFrom, int aCount ) |
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{ |
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byte[] temp = new byte[ aCount ]; |
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int ret = aFrom.Read( temp, 0, aCount ); |
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if ( ret != aCount ) |
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{ |
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throw new Exception( "Unable to read required number of bytes from stream" ); |
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} |
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Write( temp, 0, aCount ); |
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} |
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public virtual void Write( byte[] aBuffer, int aOffset, int aCount ) |
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{ |
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iStream.Write( aBuffer, aOffset, aCount ); |
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} |
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#endregion |
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|
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#region API |
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public void SwitchStream( Stream aStream, TOwnershipType aType ) |
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{ |
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if ( iStream != null ) |
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{ |
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if ( iOwnership == TOwnershipType.EOwned ) |
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{ |
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iStream.Dispose(); |
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iStream = null; |
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iLength = 0; |
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} |
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} |
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// |
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iStream = aStream; |
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iOwnership = aType; |
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// |
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if ( iStream != null ) |
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{ |
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// Cache this because calling it is very expensive. |
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iLength = iStream.Length; |
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} |
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} |
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|
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public void Close() |
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{ |
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base.Dispose(); |
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} |
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127 |
|
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public void Seek( long aPosition ) |
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{ |
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Seek( aPosition, SeekOrigin.Begin ); |
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} |
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132 |
|
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public SymbianStreamReaderLE CreateReader() |
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{ |
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return SymbianStreamReaderLE.New( iStream ); |
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} |
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137 |
|
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public SymbianStreamReaderLE CreateReader( SymbianStreamReaderLE.TCloseOperation aCloseOperation ) |
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{ |
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return SymbianStreamReaderLE.New( iStream, aCloseOperation ); |
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141 |
} |
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142 |
#endregion |
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143 |
|
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144 |
#region Properties |
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public long Length |
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146 |
{ |
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get { return iLength; } |
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148 |
} |
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149 |
#endregion |
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150 |
|
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151 |
#region Operators |
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public static explicit operator Stream( SIStream aStream ) |
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{ |
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return aStream.InternalStream; |
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} |
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156 |
#endregion |
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157 |
|
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158 |
#region Internal methods |
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protected Stream InternalStream |
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160 |
{ |
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get { return iStream; } |
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162 |
} |
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163 |
#endregion |
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164 |
|
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165 |
#region Data members |
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private Stream iStream = null; |
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private TOwnershipType iOwnership = TOwnershipType.EOwned; |
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private long iLength = 0; |
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169 |
#endregion |
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170 |
} |
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171 |
} |