Still don't know how to properly handle position

CSharp/Libraries/UniversalEditor.Core/Accessors/FileAccessor.cs

@@ -9,11 +9,9 @@ namespace UniversalEditor.Accessors
 {
 	public class FileAccessor : Accessor
 	{
-		public override long Position
+		protected override long GetPosition()
 		{
-			get { return mvarFileStream.Position; }
-			set { mvarFileStream.Position = value; 
-            }
+			return mvarFileStream.Position;
 		}
 		public override long Length
 		{

CSharp/Libraries/UniversalEditor.Core/Accessors/MemoryAccessor.cs

@@ -11,6 +11,10 @@ namespace UniversalEditor.Accessors
 		private byte[] _data = new byte[0];
 
 		private long ptr = 0;
+		protected override long GetPosition()
+		{
+			return ptr;
+		}
 		public override long Length
 		{
 			get { return _data.Length; }
@@ -36,7 +40,7 @@ namespace UniversalEditor.Accessors
 			_data = data;
 		}
 
-        [DebuggerNonUserCode()]
+        // [DebuggerNonUserCode()]
 		public override void Seek(long length, SeekOrigin position)
 		{
 			long start = 0;

CSharp/Libraries/UniversalEditor.Core/Accessors/StreamAccessor.cs

@@ -12,6 +12,10 @@ namespace UniversalEditor.Accessors
 		private System.IO.Stream mvarBaseStream = null;
 		public System.IO.Stream BaseStream { get { return mvarBaseStream; } }
 
+		protected override long GetPosition()
+		{
+			return mvarBaseStream.Position;
+		}
 		public StreamAccessor()
 		{
 			mvarBaseStream = new System.IO.MemoryStream();
@@ -24,10 +28,10 @@ namespace UniversalEditor.Accessors
 		public override long Length
 		{
 			get { return mvarBaseStream.Length; }
-			set { throw new InvalidOperationException(); }
+			set { mvarBaseStream.SetLength(value); }
 		}
 
-		[DebuggerNonUserCode()]
+		// [DebuggerNonUserCode()]
 		public override void Seek(long offset, SeekOrigin position)
 		{
 			System.IO.SeekOrigin origin = System.IO.SeekOrigin.Begin;
@@ -56,14 +60,14 @@ namespace UniversalEditor.Accessors
 		{
 			// TODO: will ct ever be != count? should we add ct to Position instead of count??
 			int ct = mvarBaseStream.Read(buffer, start, count);
-			Position += count;
+			// Position += count;
 			return count;
 		}
 
 		internal override int WriteInternal(byte[] buffer, int start, int count)
 		{
 			mvarBaseStream.Write(buffer, start, count);
-			Position += count;
+			// Position += count;
 			return count;
 		}
 

CSharp/Libraries/UniversalEditor.Core/Accessors/StringAccessor.cs

@@ -10,6 +10,10 @@ namespace UniversalEditor.Accessors
 		private char[] _data = new char[0];
 
 		private long ptr = 0;
+		protected override long GetPosition()
+		{
+			return ptr;
+		}
 		public override long Length
 		{
 			get { return _data.Length; }