upload of missing file Change.cs

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@3018 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/DisplayBindings/HexEditor/Project/Src/Util/Change.cs

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+// <file>
+//     <copyright see="prj:///doc/copyright.txt"/>
+//     <license see="prj:///doc/license.txt"/>
+//     <owner name="Siegfried Pammer" email="sie_pam@gmx.at"/>
+//     <version>$Revision: 2984 $</version>
+// </file>
+
+using System;
+
+namespace HexEditor.Util
+{
+	/// <summary>
+	/// Description of Change.
+	/// </summary>
+	public class Change
+	{
+		int start, end;
+		byte[] data;
+		ChangeType type;
+		
+		public Change(int start, int end, byte[] data, ChangeType type)
+		{
+			this.start = start;
+			this.end = end;
+			this.data = data;
+			this.type = type;
+		}
+		
+		public int Start {
+			get { return start; }
+			set { start = value; }
+		}
+		
+		public int End {
+			get { return end; }
+			set { end = value; }
+		}
+		
+		public byte[] Data {
+			get { return data; }
+			set { data = value; }
+		}
+		
+		public ChangeType Type {
+			get { return type; }
+			set { type = value; }
+		}
+		
+		public void Merge(Change change)
+		{
+			byte[] tmp = new byte[0];
+			
+			switch (change.type) {
+				case ChangeType.Delete:
+					
+					break;
+				case ChangeType.Insert:
+					if ((change.start + change.data.Length) < this.start)
+						this.Prepend(change);
+					else
+						if ((change.start + change.data.Length) > this.end)
+						this.Append(change);
+					else {
+						tmp = new byte[change.data.Length + this.data.Length];
+						
+						for (int i = 0; i < (int)Math.Abs(change.start - this.start); i++)
+						{
+							tmp[i] = this.data[i];
+						}
+						
+						int offset = (int)Math.Abs(change.start - this.start);
+						
+						for (int i = offset; i < offset + change.data.Length; i++)
+						{
+							tmp[i] = change.data[i - offset];
+						}
+						
+						for (int i = offset + change.data.Length; i < (this.data.Length + offset + change.data.Length); i++)
+						{
+							tmp[i] = this.data[i - (offset + change.data.Length)];
+						}
+					}					
+					break;
+				case ChangeType.Overwrite:
+					
+					break;
+			}
+			
+			this.data = tmp;
+		}
+		
+		public void Append(Change change)
+		{
+			byte[] tmp = new byte[change.data.Length + this.data.Length];
+			
+			for (int i = 0; i < this.data.Length; i++)
+			{
+				tmp[i] = this.data[i];
+			}
+			
+			for (int i = 0; i < change.data.Length; i++)
+			{
+				tmp[i + this.data.Length] = change.data[i];
+			}
+			
+			this.end = change.end;
+			
+			this.data = tmp;
+		}
+		
+		public void Prepend(Change change)
+		{
+			byte[] tmp = new byte[change.data.Length + this.data.Length];
+			
+			for (int i = 0; i < change.data.Length; i++)
+			{
+				tmp[i] = change.data[i];
+			}
+			
+			for (int i = 0; i < this.data.Length; i++)
+			{
+				tmp[i + change.data.Length] = this.data[i];
+			}
+			
+			this.start = change.start;
+			
+			this.data = tmp;
+		}
+	}
+	
+	public enum ChangeType {
+		Delete, Insert, Overwrite
+	}
+}