--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crashanalysercmd/PerfToolsSharedLibraries/Engine/SymBuildParsingLib/Stream/SymStream.cs	Thu Feb 11 15:50:58 2010 +0200
@@ -0,0 +1,146 @@
+/*
+* Copyright (c) 2004-2008 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.IO;
+using System.Text;
+using System.Collections;
+using System.Diagnostics;
+
+namespace SymBuildParsingLib
+{
+	#region Exceptions
+	public class SymParserStreamExceptionInvalidRewindAmount : Exception
+	{
+		public SymParserStreamExceptionInvalidRewindAmount( string aMessage )
+			: base( aMessage )
+		{
+		}
+	}
+	#endregion
+
+	public class SymStream
+	{
+		#region Constructors & destructor
+		public SymStream( string aFileName )
+		{
+			iFileName = aFileName;
+			iFileStream = new FileStream( aFileName, System.IO.FileMode.Open );
+			iStream = new StreamReader( iFileStream );
+			iFileData = new Stack( 1024 * 20 );
+		}
+		#endregion
+
+		#region API
+		public char PeekChar()
+		{
+			Debug.Assert( !EOF );
+			//
+			char ret = (char) iStream.Peek();
+			//
+			if	( iPushedBackCharacters.Count > 0 )
+			{
+				ret = (char) iPushedBackCharacters.Peek();
+			}
+			return ret;
+		}
+
+		public char ReadChar()
+		{
+			Debug.Assert( !EOF );
+			//
+			char ret;
+			//
+			if	( iPushedBackCharacters.Count > 0 )
+			{
+				ret = (char) iPushedBackCharacters.Pop();
+			}
+			else
+			{
+				ret = (char) iStream.Read();
+			}
+			//
+			iFileData.Push( ret );
+			++iPosition;
+			//
+			return ret;
+		}
+
+		public void RewindChar()
+		{
+			RewindChars( 1 );
+		}
+
+		public void RewindChars( int aRewindCount )
+		{
+			long newPos = Position - aRewindCount;
+			if	( aRewindCount < 0 )
+				throw new SymParserStreamExceptionInvalidRewindAmount( "Rewind specifier must be >= 0" );
+			else if ( newPos < 0 || newPos >= Size ) 
+				throw new SymParserStreamExceptionInvalidRewindAmount( "Rewind specifier takes stream position beyond scope of file" );
+
+			for( int i=0; i<aRewindCount; i++ )
+			{
+				char character = (char) iFileData.Pop();
+				iPushedBackCharacters.Push( character );
+			}
+
+			iPosition -= aRewindCount;
+		}
+		#endregion
+
+		#region Properties
+		public string FileName
+		{
+			get { return iFileName; }
+		}
+
+		public long Position
+		{
+			get { return iPosition; }
+		}
+
+		public long Size
+		{
+			get { return iStream.BaseStream.Length; }
+		}
+
+		public bool EOF
+		{
+			get
+			{
+				long fileSize = Size;
+				bool atEnd = ( Position >= fileSize );
+				return atEnd;
+			}
+		}
+		#endregion
+
+		#region Constants
+		private const int KStreamEOF = -1;
+		#endregion
+
+		#region Data members
+		private readonly string iFileName;
+		private StreamReader iStream;
+		private FileStream iFileStream;
+		private Stack iPushedBackCharacters = new Stack( 1024 );
+		private Stack iFileData;
+		private long iPosition;
+		#endregion
+	}
+}