--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/crashanalysercmd/PerfToolsSharedLibraries/Engine/SymbianUtils/TextUtilities/Readers/Types/Text/AsyncTextDataReader.cs	Thu Feb 11 15:50:58 2010 +0200
@@ -0,0 +1,173 @@
+/*
+* 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.IO;
+using System.Text;
+using System.Threading;
+using System.Collections;
+using SymbianUtils.Tracer;
+
+namespace SymbianUtils
+{
+	public abstract class AsyncTextDataReader : AsyncTextReader
+	{
+		#region Enumerations
+		public enum TReadDirection
+		{
+			EReadDirectionForwards = 0,
+			EReadDirectionBackwards
+		}
+		#endregion
+
+		#region Construct & destruct
+		protected AsyncTextDataReader( string[] aLines )
+			: this( aLines, new AsyncTextReaderPrefix() )
+		{
+		}
+
+        protected AsyncTextDataReader( string[] aLines, ITracer aTracer )
+            : this( aLines, new AsyncTextReaderPrefix(), aTracer )
+        {
+        }
+
+        protected AsyncTextDataReader( string[] aLines, AsyncTextReaderPrefix aPrefixes )
+			: this( aLines, TReadDirection.EReadDirectionForwards, aPrefixes )
+		{
+		}
+
+        protected AsyncTextDataReader( string[] aLines, AsyncTextReaderPrefix aPrefixes, ITracer aTracer )
+            : this( aLines, TReadDirection.EReadDirectionForwards, aPrefixes, aTracer )
+        {
+        }
+
+        protected AsyncTextDataReader( string[] aLines, TReadDirection aReadDirection )
+			: this( aLines, TReadDirection.EReadDirectionForwards, new AsyncTextReaderPrefix(), null )
+		{
+		}
+
+        protected AsyncTextDataReader( string[] aLines, TReadDirection aReadDirection, ITracer aTracer )
+            : this( aLines, TReadDirection.EReadDirectionForwards, new AsyncTextReaderPrefix(), aTracer )
+		{
+		}
+
+        protected AsyncTextDataReader( string[] aLines, TReadDirection aReadDirection, AsyncTextReaderPrefix aPrefixes )
+            : this( aLines, aReadDirection, aPrefixes, null )
+        {
+		}
+
+        protected AsyncTextDataReader( string[] aLines, TReadDirection aReadDirection, AsyncTextReaderPrefix aPrefixes, ITracer aTracer )
+			: base( aPrefixes, aTracer )
+		{
+			iLines = aLines;
+			iReadDirection = aReadDirection;
+			//
+			switch( iReadDirection )
+			{
+			default:
+			case TReadDirection.EReadDirectionForwards:
+				iLineIndex = 0;
+				break;
+			case TReadDirection.EReadDirectionBackwards:
+				iLineIndex = iLines.Length - 1;
+				break;
+			}
+		}
+		#endregion
+
+        #region Properties
+        public int LineNumber
+		{
+			get { return iLineIndex; }
+		}
+		#endregion
+
+		#region Abstract reading framework
+		protected override int CalculateProgress()
+		{
+			int prog = 0;
+			//
+			switch( iReadDirection )
+			{
+			default:
+			case TReadDirection.EReadDirectionForwards:
+				{
+				prog = base.CalculateProgress();
+				break;
+				}
+			case TReadDirection.EReadDirectionBackwards:
+				{
+				float positionAsFloat = (float)Position;
+				float sizeAsFloat = (float)Size;
+				prog = (int)((positionAsFloat / sizeAsFloat) * 100.0);
+				prog = System.Math.Max(1, System.Math.Min(100, prog));
+				break;
+				}
+			}
+			//
+			return prog;
+		}
+
+		protected override string ProvideReadLine()
+		{
+			string ret = null;
+			//
+			switch( iReadDirection )
+			{
+			default:
+			case TReadDirection.EReadDirectionForwards:
+				if	( iLineIndex < iLines.Length )
+				{
+					ret = iLines[ iLineIndex++ ];
+				}
+				break;
+			case TReadDirection.EReadDirectionBackwards:
+				if	( iLineIndex >= 0 )
+				{
+					ret = iLines[ iLineIndex-- ];
+				}
+				break;
+			}
+			//
+			return ret;
+		}
+
+		protected override long Size
+		{
+			get
+			{
+				long size = iLines.LongLength;
+				return size;
+			}
+		}
+
+		protected override long Position
+		{
+			get
+			{
+				long position = (long) iLineIndex;
+				return position;
+			}
+		}
+		#endregion
+
+		#region Data members
+		private readonly string[] iLines;
+		private readonly TReadDirection iReadDirection;
+		private int iLineIndex = 0;
+		#endregion
+	}
+}