Merge branch 'UndoCleanup'

Commands/Moderation/CmdHighlight.cs

@@ -16,6 +16,7 @@
     permissions and limitations under the Licenses.
  */
 using System;
+using System.Collections.Generic;
 using System.IO;
 using MCGalaxy.Util;
 
@@ -52,7 +53,7 @@ namespace MCGalaxy.Commands {
             Player who = PlayerInfo.Find(name);
             if (who != null) {
                 FoundUser = true;
-                HighlightOnline(p, seconds, who);
+                PerformHighlight(p, seconds, who.UndoBuffer);
             }
 
             UndoFile.HighlightPlayer(p, name.ToLower(), seconds, ref FoundUser);
@@ -64,24 +65,31 @@ namespace MCGalaxy.Commands {
             }
         }
         
-        static void HighlightOnline(Player p, long seconds, Player who) {
+       static void PerformHighlight(Player p, long seconds, UndoCache cache) {
-            for (int i = who.UndoBuffer.Count - 1; i >= 0; --i) {
+            UndoCacheNode node = cache.Tail;
-                try {
+            if (node == null) return;
-                    Player.UndoPos undo = who.UndoBuffer[i];
-                    Level foundLevel = LevelInfo.FindExact(undo.mapName);
-                    if (foundLevel != p.level) continue;
             
-                    byte b = foundLevel.GetTile(undo.x, undo.y, undo.z);
+            while (node != null) {
-                    DateTime time = Server.StartTime.AddSeconds(undo.timeDelta + seconds);
+                Level lvl = LevelInfo.FindExact(node.MapName);
-                    if (time < DateTime.UtcNow) break;
+                if (lvl != p.level) continue;
+                List<UndoCacheItem> items = node.Items;
                 
-                    if (b == undo.newtype || Block.Convert(b) == Block.water || Block.Convert(b) == Block.lava) {
+                for (int i = items.Count - 1; i >= 0; i--) {
+                    UndoCacheItem item = items[i];                    
+                    ushort x, y, z;
+                    node.Unpack(item.Index, out x, out y, out z);                    
+                    DateTime time = node.BaseTime.AddSeconds(item.TimeDelta + seconds);
+                    if (time < DateTime.UtcNow) return;
+                    
+                    byte b = lvl.GetTile(x, y, z);
+                    if (b == item.NewType || Block.Convert(b) == Block.water || Block.Convert(b) == Block.lava) {
                         if (b == Block.air || Block.Convert(b) == Block.water || Block.Convert(b) == Block.lava)
-                            p.SendBlockchange(undo.x, undo.y, undo.z, Block.red);
+                            p.SendBlockchange(x, y, z, Block.red);
                         else
-                            p.SendBlockchange(undo.x, undo.y, undo.z, Block.green);
+                            p.SendBlockchange(x, y, z, Block.green);
                     }
-                } catch { }
+                }
+                node = node.Prev;
             }
         }
 

Commands/building/CmdRedo.cs

@@ -16,6 +16,8 @@
     permissions and limitations under the Licenses.
  */
 using System;
+using System.Collections.Generic;
+using MCGalaxy.Util;
 
 namespace MCGalaxy.Commands {
     
@@ -30,22 +32,33 @@ namespace MCGalaxy.Commands {
 
         public override void Use(Player p, string message) {
             if (message != "") { Help(p); return; }
-
+            PerformRedo(p, p.RedoBuffer);
-            for (int i = p.RedoBuffer.Count - 1; i >= 0; i--) {
-                Player.UndoPos Pos = p.RedoBuffer[i];
-                Level lvl = LevelInfo.FindExact(Pos.mapName);
-                if (lvl == null)
-                    continue;
-                
-                byte type = lvl.GetTile(Pos.x, Pos.y, Pos.z), extType = 0;
-                if (type == Block.custom_block)
-                    extType = lvl.GetExtTile(Pos.x, Pos.y, Pos.z);
-                lvl.Blockchange(p, Pos.x, Pos.y, Pos.z, Pos.type, Pos.extType);
-            }
-
             Player.SendMessage(p, "Redo performed.");
         }
         
+        static void PerformRedo(Player p, UndoCache cache) {
+            UndoCacheNode node = cache.Tail;
+            if (node == null) return;
+            
+            while (node != null) {
+                Level lvl = LevelInfo.FindExact(node.MapName);
+                if (lvl == null) continue;            
+                List<UndoCacheItem> items = node.Items;
+                
+                for (int i = items.Count - 1; i >= 0; i--) {
+                    UndoCacheItem item = items[i];                    
+                    ushort x, y, z;
+                    node.Unpack(item.Index, out x, out y, out z);
+                    
+                    byte type = lvl.GetTile(x, y, z), extType = 0;
+                    if (type == Block.custom_block)
+                        extType = lvl.GetExtTile(x, y, z);
+                    lvl.Blockchange(p, x, y, z, item.Type, item.ExtType);
+                }
+                node = node.Prev;
+            }
+        }
+
         public override void Help(Player p) {
             Player.SendMessage(p, "/redo - Redoes the Undo you just performed.");
         }

Commands/building/CmdUndo.cs

@@ -1,7 +1,7 @@
 /*
     Copyright 2011 MCGalaxy
         
-    Dual-licensed under the    Educational Community License, Version 2.0 and
+    Dual-licensed under the Educational Community License, Version 2.0 and
     the GNU General Public License, Version 3 (the "Licenses"); you may
     not use this file except in compliance with the Licenses. You may
     obtain a copy of the Licenses at
@@ -16,8 +16,7 @@
     permissions and limitations under the Licenses.
  */
 using System;
-using System.Globalization;
+using System.Collections.Generic;
-using System.IO;
 using MCGalaxy.Util;
 
 namespace MCGalaxy.Commands
@@ -89,12 +88,7 @@ namespace MCGalaxy.Commands
             }
             
             Level saveLevel = null;
-            for (int i = who.UndoBuffer.Count - 1; i >= 0; --i) {
+            PerformUndo(p, seconds, who.UndoBuffer, ref saveLevel);
-                try {
-                    Player.UndoPos Pos = who.UndoBuffer[i];
-                    if (!CheckBlockPlayer(p, seconds, Pos, ref saveLevel)) break;
-                } catch { }
-            }
             bool foundUser = false;
             UndoFile.UndoPlayer(p, whoName.ToLower(), seconds, ref foundUser);
 
@@ -159,24 +153,41 @@ namespace MCGalaxy.Commands
             p.level.Save(true);
         }
         
-        bool CheckBlockPlayer(Player p, long seconds, Player.UndoPos undo, ref Level saveLevel) {
+        static void PerformUndo(Player p, long seconds, UndoCache cache, ref Level saveLvl) {
-            Level lvl = LevelInfo.FindExact(undo.mapName);
+            UndoCacheNode node = cache.Tail;
-            saveLevel = lvl;
+            if (node == null) return;
-            byte b = lvl.GetTile(undo.x, undo.y, undo.z);
-            DateTime time = Server.StartTime.AddSeconds(undo.timeDelta + seconds);
-            if (time < DateTime.UtcNow) return false;
             
-            if (b == undo.newtype || Block.Convert(b) == Block.water || Block.Convert(b) == Block.lava) {
+            while (node != null) {
-                undo.newtype = undo.type; undo.newExtType = undo.extType;
+                Level lvl = LevelInfo.FindExact(node.MapName);
-                byte extType = 0;
+                if (lvl == null) continue;
-                if (b == Block.custom_block)
+                saveLvl = lvl;
-                    extType = lvl.GetExtTile(undo.x, undo.y, undo.z);
+                List<UndoCacheItem> items = node.Items;
                 
-                lvl.Blockchange(p, undo.x, undo.y, undo.z, undo.type, undo.extType);
+                for (int i = items.Count - 1; i >= 0; i--) {
-                undo.type = b; undo.extType = extType;
+                    UndoCacheItem item = items[i];
-                if (p != null) p.RedoBuffer.Add(undo);
+                    ushort x, y, z;
+                    node.Unpack(item.Index, out x, out y, out z);
+                    DateTime time = node.BaseTime.AddSeconds(item.TimeDelta + seconds);
+                    if (time < DateTime.UtcNow) return;
+                    
+                    byte b = lvl.GetTile(x, y, z);
+                    if (b == item.NewType || Block.Convert(b) == Block.water || Block.Convert(b) == Block.lava) {
+                    	Player.UndoPos uP = default(Player.UndoPos);
+                        uP.newtype = item.Type; uP.newExtType = item.ExtType;
+                        byte extType = 0;
+                        if (b == Block.custom_block) extType = lvl.GetExtTile(x, y, z);                        
+                        lvl.Blockchange(p, x, y, z, item.Type, item.ExtType);
+                        
+                        uP.type = b; uP.extType = extType;
+                        uP.x = x; uP.y = y; uP.z = z;
+                        uP.mapName = node.MapName;
+                        time = node.BaseTime.AddSeconds(item.TimeDelta);
+                        uP.timeDelta = (int)time.Subtract(Server.StartTime).TotalSeconds;
+                        if (p != null) p.RedoBuffer.Add(lvl, uP);
+                    }
+                }
+                node = node.Prev;
             }
-            return true;
         }
         
         bool CheckBlockPhysics(Player p, long seconds, int i, Level.UndoPos undo) {

Levels/Level.Blocks.cs

@@ -160,7 +160,7 @@ namespace MCGalaxy {
             Pos.type = oldType; Pos.extType = oldExtType;
             Pos.newtype = type; Pos.newExtType = extType;
             Pos.timeDelta = (int)DateTime.UtcNow.Subtract(Server.StartTime).TotalSeconds;
-            p.UndoBuffer.Add(Pos);
+            p.UndoBuffer.Add(this, Pos);
         }
 
         bool CheckTNTWarsChange(Player p, ushort x, ushort y, ushort z, ref byte type) {
@@ -328,7 +328,7 @@ namespace MCGalaxy {
                 Pos.type = b; Pos.extType = extB;
                 Pos.newtype = type; Pos.newExtType = extType;
                 Pos.timeDelta = (int)DateTime.UtcNow.Subtract(Server.StartTime).TotalSeconds;
-                p.UndoBuffer.Add(Pos);
+                p.UndoBuffer.Add(this, Pos);
 
                 errorLocation = "Setting tile";
                 p.loginBlocks++;

MCGalaxy_.csproj

@@ -443,6 +443,7 @@
     <Compile Include="Player\Group\GroupProperties.cs" />
     <Compile Include="Player\Player.Handlers.cs" />
     <Compile Include="Player\PlayerInfo.cs" />
+    <Compile Include="Player\Undo\UndoCache.cs" />
     <Compile Include="Player\Waypoint.cs" />
     <Compile Include="Player\Player.Timers.cs" />
     <Compile Include="Player\Undo\UndoFile.cs" />

Player/Player.cs

@@ -235,8 +235,8 @@ namespace MCGalaxy {
 
         //Undo
         public struct UndoPos { public ushort x, y, z; public byte type, extType, newtype, newExtType; public string mapName; public int timeDelta; }
-        public List<UndoPos> UndoBuffer = new List<UndoPos>();
+        public UndoCache UndoBuffer = new UndoCache();
-        public List<UndoPos> RedoBuffer = new List<UndoPos>();
+        public UndoCache RedoBuffer = new UndoCache();
 
 
         public bool showPortals = false;

Player/Undo/UndoCache.cs

@@ -0,0 +1,111 @@
+/*
+    Copyright 2015 MCGalaxy
+    
+    Dual-licensed under the Educational Community License, Version 2.0 and
+    the GNU General Public License, Version 3 (the "Licenses"); you may
+    not use this file except in compliance with the Licenses. You may
+    obtain a copy of the Licenses at
+    
+    http://www.opensource.org/licenses/ecl2.php
+    http://www.gnu.org/licenses/gpl-3.0.html
+    
+    Unless required by applicable law or agreed to in writing,
+    software distributed under the Licenses are distributed on an "AS IS"
+    BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express
+    or implied. See the Licenses for the specific language governing
+    permissions and limitations under the Licenses.
+ */
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using System.Threading;
+
+namespace MCGalaxy.Util {
+
+    public sealed class UndoCache {
+        
+        /// <summary> The oldest/first node in the cache. </summary>
+        public UndoCacheNode Head;
+        
+        /// <summary> The newest/last node in the cache. </summary>
+        public UndoCacheNode Tail;
+        
+        /// <summary> Total number of items in the cache. </summary>
+        public volatile int Count;
+        
+        /// <summary> Appends an item to the cache. </summary>
+        public void Add(Level lvl, Player.UndoPos item) {
+            DateTime time = Server.StartTime.AddSeconds(item.timeDelta);
+            if (Head == null) {
+                Head = UndoCacheNode.Make(lvl, time);
+                Tail = Head;
+            }
+
+            if (lvl.name != Tail.MapName || lvl.Width != Tail.Width || lvl.Height != Tail.Height ||
+                lvl.Length != Tail.Length || Math.Abs((time - Tail.BaseTime).TotalSeconds) > 32767) {
+                UndoCacheNode node = UndoCacheNode.Make(lvl, time);
+                Tail.Next = node; node.Prev = Tail;
+                Tail = node;
+            }
+            
+            short timeDiff = (short)(time - Tail.BaseTime).TotalSeconds;
+            Tail.Items.Add(UndoCacheItem.Make(Tail, timeDiff, ref item));
+            Count++;
+        }
+        
+        /// <summary> Removes all items from the cache and resets the state to default. </summary>
+        public void Clear() {
+            Count = 0;
+            if( Head == null ) return;
+            
+            UndoCacheNode node = Head;
+            while( node != null ) {
+                node.Items.Clear();
+                node = node.Next;
+            }
+            Head = null; Tail = null;
+        }
+    }
+    
+    public sealed class UndoCacheNode {
+        
+        public string MapName;
+        public int Width, Height, Length;
+        public DateTime BaseTime;
+        
+        public UndoCacheNode Prev, Next;
+        public List<UndoCacheItem> Items = new List<UndoCacheItem>();
+        
+        public static UndoCacheNode Make(Level lvl, DateTime time) {
+            UndoCacheNode node = new UndoCacheNode();
+            node.MapName = lvl.name;
+            node.Width = lvl.Width; node.Height = lvl.Height; node.Length = lvl.Length;
+            node.BaseTime = time;
+            return node;
+        }
+        
+        public void Unpack(int index, out ushort x, out ushort y, out ushort z) {
+            x = (ushort)(index % Width);
+            y = (ushort)(index / (Width * Length));
+            z = (ushort)((index / Width) % Length);
+        }
+    }
+    
+    [StructLayout(LayoutKind.Sequential, Pack = 1)]
+    public struct UndoCacheItem {
+        public int Index;
+        public byte Type, ExtType;
+        public byte NewType, NewExtType;
+        public short TimeDelta;
+        
+        public static UndoCacheItem Make(UndoCacheNode node, short timeDelta, ref Player.UndoPos pos) {
+            UndoCacheItem item = default(UndoCacheItem);
+            item.Index = pos.x + node.Width * (pos.z + node.Length * pos.y);
+            item.Type = pos.type; item.ExtType = pos.extType;
+            item.NewType = pos.newtype; item.NewExtType = pos.newExtType;
+            item.TimeDelta = timeDelta;
+            return item;
+        }
+    }
+}

Player/Undo/UndoFile.cs

@@ -30,6 +30,8 @@ namespace MCGalaxy.Util {
         
         protected abstract void SaveUndoData(List<Player.UndoPos> buffer, string path);
         
+        protected abstract void SaveUndoData(UndoCache buffer, string path);
+         
         protected abstract void ReadUndoData(List<Player.UndoPos> buffer, string path);
         
         protected abstract bool UndoEntry(Player p, string path, ref byte[] temp, long seconds);
@@ -39,7 +41,7 @@ namespace MCGalaxy.Util {
         protected abstract string Extension { get; }
         
         public static void SaveUndo(Player p) {
-            if( p == null || p.UndoBuffer == null || p.UndoBuffer.Count < 1) return;
+            if( p == null || p.UndoBuffer.Count < 1) return;
             
             CreateDefaultDirectories();
             if (Directory.GetDirectories(undoDir).Length >= Server.totalUndo) {
@@ -54,7 +56,7 @@ namespace MCGalaxy.Util {
             
             int numFiles = Directory.GetFiles(playerDir).Length;
             string path = Path.Combine(playerDir, numFiles + NewFormat.Extension);
-            NewFormat.SaveUndoData(p.UndoBuffer.ToList(), path);
+            NewFormat.SaveUndoData(p.UndoBuffer, path);
         }
         
         public static void UndoPlayer(Player p, string targetName, long seconds, ref bool FoundUser) {
@@ -96,11 +98,11 @@ namespace MCGalaxy.Util {
         }
         
         static int CompareFiles(string a, string b) {
-        	int aNumStart = a.LastIndexOf('\\'), bNumStart = b.LastIndexOf('\\');
+            int aNumStart = a.LastIndexOf('\\'), bNumStart = b.LastIndexOf('\\');
             int aNumEnd = a.LastIndexOf('.'), bNumEnd = b.LastIndexOf('.');
             if (aNumStart < 0 || bNumStart < 0 || aNumEnd < 0 || 
                 bNumEnd < 0 || aNumStart >= aNumEnd || bNumStart >= bNumEnd)
-            	return a.CompareTo(b);
+                return a.CompareTo(b);
             
             int aNum, bNum;
             if (!int.TryParse(a.Substring(aNumStart + 1, aNumEnd - aNumStart - 1), out aNum) ||

Player/Undo/UndoFileBin.cs

@@ -32,24 +32,57 @@ namespace MCGalaxy.Util {
             using (FileStream fs = File.Create(path)) {
                 BinaryWriter w = new BinaryWriter(fs);
                 long entriesPos = 0;
-                ChunkHeader lastChunk = default(ChunkHeader);
+                ChunkHeader last = default(ChunkHeader);
                 
                 foreach (Player.UndoPos uP in buffer) {
                     DateTime time = Server.StartTime.AddSeconds(uP.timeDelta);
-                    int timeDiff = (int)(time - lastChunk.BaseTime).TotalSeconds;
+                    int timeDiff = (int)(time - last.BaseTime).TotalSeconds;
-                    if (lastChunk.LevelName != uP.mapName || timeDiff > 65535 || lastChunk.Entries == ushort.MaxValue) {
+                    if (last.LevelName != uP.mapName || timeDiff > 65535 || last.Entries == ushort.MaxValue) {
-                        WriteChunkEntries(w, lastChunk.Entries, entriesPos);
+                        WriteChunkEntries(w, last.Entries, entriesPos);
-                        lastChunk = WriteEmptyChunk(w, uP, ref entriesPos);
+                        last = WriteEmptyChunk(w, uP.mapName, time, ref entriesPos);
                     }
                     
                     w.Write((ushort)timeDiff);
                     w.Write(uP.x); w.Write(uP.y); w.Write(uP.z);
                     w.Write(uP.type); w.Write(uP.extType);
                     w.Write(uP.newtype); w.Write(uP.newExtType);
-                    lastChunk.Entries++;
+                    last.Entries++;
+                }
+                if (last.Entries > 0)
+                    WriteChunkEntries(w, last.Entries, entriesPos);
+            }
+        }
+        
+        protected override void SaveUndoData(UndoCache buffer, string path) {
+            using (FileStream fs = File.Create(path)) {
+                BinaryWriter w = new BinaryWriter(fs);
+                long entriesPos = 0;
+                ChunkHeader last = default(ChunkHeader);
+                UndoCacheNode node = buffer.Tail;
+                
+                while (node != null) {
+                    List<UndoCacheItem> items = node.Items;
+                    for (int i = 0; i < items.Count; i++) {
+                        UndoCacheItem uP = items[i];
+                        DateTime time = node.BaseTime.AddSeconds(uP.TimeDelta);
+                        int timeDiff = (int)(time - last.BaseTime).TotalSeconds;
+                        if (last.LevelName != node.MapName || timeDiff > 65535 || last.Entries == ushort.MaxValue) {
+                            WriteChunkEntries(w, last.Entries, entriesPos);
+                            last = WriteEmptyChunk(w, node.MapName, time, ref entriesPos);
+                        }
+                        ushort x, y, z;
+                        node.Unpack(uP.Index, out x, out y, out z);
+                        
+                        w.Write((ushort)timeDiff);
+                        w.Write(x); w.Write(y); w.Write(z);
+                        w.Write(uP.Type); w.Write(uP.ExtType);
+                        w.Write(uP.NewType); w.Write(uP.NewExtType);
+                        last.Entries++;
+                    }
+                    if (last.Entries > 0)
+                        WriteChunkEntries(w, last.Entries, entriesPos);
+                    node = node.Prev;
                 }
-                if (lastChunk.Entries > 0)
-                    WriteChunkEntries(w, lastChunk.Entries, entriesPos);
             }
         }
         
@@ -102,8 +135,8 @@ namespace MCGalaxy.Util {
                     fs.Read(temp, 0, chunk.Entries * entrySize);
                     
                     for (int j = chunk.Entries - 1; j >= 0; j-- ) {
-                    	int offset = j * entrySize;
+                        int offset = j * entrySize;
-                    	DateTime time = chunk.BaseTime.AddSeconds(U16(temp, offset + 0));
+                        DateTime time = chunk.BaseTime.AddSeconds(U16(temp, offset + 0));
                         if (time.AddSeconds(seconds) < now) return false;
                         Pos.x = U16(temp, offset + 2); Pos.y = U16(temp, offset + 4); Pos.z = U16(temp, offset + 6);
                         
@@ -117,7 +150,7 @@ namespace MCGalaxy.Util {
                             Pos.newtype = oldType; Pos.newExtType = oldExtType;
                             Pos.extType = newExtType; Pos.timeDelta = timeDelta;
                             lvl.Blockchange(p, Pos.x, Pos.y, Pos.z, Pos.newtype, Pos.newExtType);
-                            if (p != null) p.RedoBuffer.Add(Pos);
+                            if (p != null) p.RedoBuffer.Add(lvl, Pos);
                         }
                     }
                 }
@@ -145,8 +178,8 @@ namespace MCGalaxy.Util {
                     fs.Read(temp, 0, chunk.Entries * entrySize);
                     
                     for (int j = chunk.Entries - 1; j >= 0; j-- ) {
-                    	int offset = j * entrySize;
+                        int offset = j * entrySize;
-                    	DateTime time = chunk.BaseTime.AddSeconds(U16(temp, offset + 0));
+                        DateTime time = chunk.BaseTime.AddSeconds(U16(temp, offset + 0));
                         if (time.AddSeconds(seconds) < now) return false;
                         ushort x = U16(temp, offset + 2), y = U16(temp, offset + 4), z = U16(temp, offset + 6);
                         
@@ -167,7 +200,7 @@ namespace MCGalaxy.Util {
         }
         
         static ushort U16(byte[] buffer, int offset) {
-        	return (ushort)(buffer[offset + 0] | buffer[offset + 1] << 8);
+            return (ushort)(buffer[offset + 0] | buffer[offset + 1] << 8);
         }
         
         static bool CheckChunk(ChunkHeader chunk, DateTime now, long seconds, Player p, out Level lvl) {
@@ -216,9 +249,8 @@ namespace MCGalaxy.Util {
             w.BaseStream.Seek(curPos, SeekOrigin.Begin);
         }
         
-        static ChunkHeader WriteEmptyChunk(BinaryWriter w, Player.UndoPos uP, ref long entriesPos) {
+        static ChunkHeader WriteEmptyChunk(BinaryWriter w, string mapName, DateTime time, ref long entriesPos) {
-        	DateTime time = Server.StartTime.AddSeconds(uP.timeDelta);
+            byte[] mapBytes = Encoding.UTF8.GetBytes(mapName);
-            byte[] mapBytes = Encoding.UTF8.GetBytes(uP.mapName);
             w.Write((ushort)mapBytes.Length);
             w.Write(mapBytes);
             w.Write(time.ToLocalTime().Ticks);
@@ -226,7 +258,7 @@ namespace MCGalaxy.Util {
             entriesPos = w.BaseStream.Position;
             w.Write((ushort)0);
             ChunkHeader header = default(ChunkHeader);
-            header.LevelName = uP.mapName; header.BaseTime = time;
+            header.LevelName = mapName; header.BaseTime = time;
             return header;
         }
     }

Player/Undo/UndoFileText.cs

@@ -30,7 +30,7 @@ namespace MCGalaxy.Util {
         protected override void SaveUndoData(List<Player.UndoPos> buffer, string path) {
             using (StreamWriter w = File.CreateText(path)) {
                 foreach (Player.UndoPos uP in buffer) {
-        			DateTime time = Server.StartTimeLocal.AddSeconds(uP.timeDelta);
+                    DateTime time = Server.StartTimeLocal.AddSeconds(uP.timeDelta);
                     w.Write(
                         uP.mapName + " " + uP.x + " " + uP.y + " " + uP.z + " " +
                         time.ToString(CultureInfo.InvariantCulture).Replace(' ', '&') + " " +
@@ -39,6 +39,10 @@ namespace MCGalaxy.Util {
             }
         }
         
+        protected override void SaveUndoData(UndoCache buffer, string path) {
+            throw new NotImplementedException("The .txt based undo files are deprecated.");
+        }
+        
         protected override void ReadUndoData(List<Player.UndoPos> buffer, string path) {
             Player.UndoPos Pos;
             Pos.extType = 0; Pos.newExtType = 0;
@@ -74,14 +78,14 @@ namespace MCGalaxy.Util {
                 try {
                     // line format: mapName x y z date oldblock newblock
                     if (!InTime(lines[(i * 7) - 3], seconds)) return false;
-                    Level foundLevel = LevelInfo.FindExact(lines[(i * 7) - 7]);
+                    Level lvl = LevelInfo.FindExact(lines[(i * 7) - 7]);
-                    if (foundLevel == null) continue;
+                    if (lvl == null) continue;
                     
-                    Pos.mapName = foundLevel.name;
+                    Pos.mapName = lvl.name;
                     Pos.x = Convert.ToUInt16(lines[(i * 7) - 6]);
                     Pos.y = Convert.ToUInt16(lines[(i * 7) - 5]);
                     Pos.z = Convert.ToUInt16(lines[(i * 7) - 4]);
-                    Pos.type = foundLevel.GetTile(Pos.x, Pos.y, Pos.z);
+                    Pos.type = lvl.GetTile(Pos.x, Pos.y, Pos.z);
 
                     if (Pos.type == Convert.ToByte(lines[(i * 7) - 1]) || Block.Convert(Pos.type) == Block.water || 
                         Block.Convert(Pos.type) == Block.lava || Pos.type == Block.grass) {
@@ -89,8 +93,8 @@ namespace MCGalaxy.Util {
                         Pos.newtype = Convert.ToByte(lines[(i * 7) - 2]);
                         Pos.timeDelta = timeDelta;
 
-                        foundLevel.Blockchange(p, Pos.x, Pos.y, Pos.z, Pos.newtype, 0);
+                        lvl.Blockchange(p, Pos.x, Pos.y, Pos.z, Pos.newtype, 0);
-                        if (p != null) p.RedoBuffer.Add(Pos);
+                        if (p != null) p.RedoBuffer.Add(lvl, Pos);
                     }
                 } catch {
                 }