diff -r 000000000000 -r 818e61de6cd1 crashanalysercmd/PerfToolsSharedLibraries/Engine/SymbianImageLib/Common/Streams/SIStream.cs
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crashanalysercmd/PerfToolsSharedLibraries/Engine/SymbianImageLib/Common/Streams/SIStream.cs	Thu Feb 11 15:50:58 2010 +0200
@@ -0,0 +1,171 @@
+/*
+* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies). 
+* All rights reserved.
+* This component and the accompanying materials are made available
+* under the terms of "Eclipse Public License v1.0"
+* which accompanies this distribution, and is available
+* at the URL "http://www.eclipse.org/legal/epl-v10.html".
+*
+* Initial Contributors:
+* Nokia Corporation - initial contribution.
+*
+* Contributors:
+* 
+* Description:
+*
+*/
+using System;
+using System.Collections.Generic;
+using System.Text;
+using System.IO;
+using SymbianUtils;
+using SymbianUtils.Streams;
+using SymbianImageLib.Common.Header;
+using SymbianStructuresLib.Compression.Common;
+
+namespace SymbianImageLib.Common.Streams
+{
+    internal class SIStream : DisposableObject
+    {
+        #region Enumerations
+        public enum TOwnershipType
+        {
+            EOwned = 0,
+            EOwnedExternally
+        }
+        #endregion
+
+        #region Constructors
+        public SIStream()
+            : this( null, TOwnershipType.EOwned )
+        {
+        }
+
+        public SIStream( Stream aStream )
+            : this( aStream, TOwnershipType.EOwned )
+        {
+        }
+
+        public SIStream( Stream aStream, TOwnershipType aType )
+        {
+            SwitchStream( aStream, aType );
+        }
+        #endregion
+
+        #region Framework API
+        public virtual bool InRange( long aPosition )
+        {
+            bool ret = ( aPosition >= 0 && aPosition < this.Length );
+            return ret;
+        }
+
+        public virtual void Seek( long aPosition, SeekOrigin aOrigin )
+        {
+            iStream.Seek( aPosition, aOrigin );
+        }
+
+        public virtual int Read( byte[] aBuffer, int aOffset, int aCount )
+        {
+            int ret = iStream.Read( aBuffer, aOffset, aCount );
+            return ret;
+        }
+
+        public virtual void Write( byte[] aBuffer )
+        {
+            Write( aBuffer, 0, aBuffer.Length );
+        }
+
+        public virtual void Write( SIStream aFrom, int aCount )
+        {
+            Write( (Stream) aFrom, aCount );
+        }
+
+        public virtual void Write( Stream aFrom, int aCount )
+        {
+            byte[] temp = new byte[ aCount ];
+            int ret = aFrom.Read( temp, 0, aCount );
+            if ( ret != aCount )
+            {
+                throw new Exception( "Unable to read required number of bytes from stream" );
+            }
+            Write( temp, 0, aCount );
+        }
+
+        public virtual void Write( byte[] aBuffer, int aOffset, int aCount )
+        {
+            iStream.Write( aBuffer, aOffset, aCount );
+        }
+        #endregion
+
+        #region API
+        public void SwitchStream( Stream aStream, TOwnershipType aType )
+        {
+            if ( iStream != null )
+            {
+                if ( iOwnership == TOwnershipType.EOwned )
+                {
+                    iStream.Dispose();
+                    iStream = null;
+                    iLength = 0;
+                }
+            }
+            //
+            iStream = aStream;
+            iOwnership = aType;
+            //
+            if ( iStream != null )
+            {
+                // Cache this because calling it is very expensive.
+                iLength = iStream.Length;
+            }
+        }
+
+        public void Close()
+        {
+            base.Dispose();
+        }
+
+        public void Seek( long aPosition )
+        {
+            Seek( aPosition, SeekOrigin.Begin );
+        }
+
+        public SymbianStreamReaderLE CreateReader()
+        {
+            return SymbianStreamReaderLE.New( iStream );
+        }
+
+        public SymbianStreamReaderLE CreateReader( SymbianStreamReaderLE.TCloseOperation aCloseOperation )
+        {
+            return SymbianStreamReaderLE.New( iStream, aCloseOperation );
+        }
+        #endregion
+
+        #region Properties
+        public long Length
+        {
+            get { return iLength; }
+        }
+        #endregion
+
+        #region Operators
+        public static explicit operator Stream( SIStream aStream )
+        {
+            return aStream.InternalStream;
+        }
+        #endregion
+
+        #region Internal methods
+        protected Stream InternalStream
+        {
+            get { return iStream; }
+        }
+        #endregion
+
+        #region Data members
+        private Stream iStream = null;
+        private TOwnershipType iOwnership = TOwnershipType.EOwned;
+        private long iLength = 0;
+        #endregion
+    }
+}