Implemented new Anvil saving format, fixed old chunk saving format.

- Added 'Chunk' Interface.
 - Moved old 'Chunk' to 'OldChunk' and replaced dynamic world height reference with '128.
 - Added 'AnvilChunk' implementing the new anvil chunk format.
 - Added temp fixes to FileMcRegionChunkStore.java, TrueZipMcRegionChunkStore.java and ZippedMcRegionChunkStore.java too allow them to read .mca files.
 - Added the new 'IntArrayTag' since the new heightmap tag wasn't recognized.
 - Moved 'getChildTag' to 'NBTUtils'.

src/main/java/com/sk89q/jnbt/IntArrayTag.java

@@ -0,0 +1,87 @@
+package com.sk89q.jnbt;
+
+import com.sk89q.jnbt.Tag;
+
+/*
+ * JNBT License
+ * 
+ * Copyright (c) 2010 Graham Edgecombe
+ * All rights reserved.
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 
+ *     * Redistributions of source code must retain the above copyright notice,
+ *       this list of conditions and the following disclaimer.
+ *       
+ *     * Redistributions in binary form must reproduce the above copyright
+ *       notice, this list of conditions and the following disclaimer in the
+ *       documentation and/or other materials provided with the distribution.
+ *       
+ *     * Neither the name of the JNBT team nor the names of its
+ *       contributors may be used to endorse or promote products derived from
+ *       this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE. 
+ */
+
+/**
+ * The <code>TAG_Int_Array</code> tag.
+ * 
+ * @author Graham Edgecombe
+ * 
+ */
+public final class IntArrayTag extends Tag {
+
+    /**
+     * The value.
+     */
+    private final int[] value;
+
+    /**
+     * Creates the tag.
+     * 
+     * @param name
+     *            The name.
+     * @param value
+     *            The value.
+     */
+    public IntArrayTag(String name, int[] value) {
+        super(name);
+        this.value = value;
+    }
+
+    @Override
+    public int[] getValue() {
+        return value;
+    }
+
+    @Override
+    public String toString() {
+        StringBuilder hex = new StringBuilder();
+        for (int b : value) {
+            String hexDigits = Integer.toHexString(b).toUpperCase();
+            if (hexDigits.length() == 1) {
+                hex.append("0");
+            }
+            hex.append(hexDigits).append(" ");
+        }
+        String name = getName();
+        String append = "";
+        if (name != null && !name.equals("")) {
+            append = "(\"" + this.getName() + "\")";
+        }
+        return "TAG_Int_Array" + append + ": " + hex.toString();
+    }
+
+}

src/main/java/com/sk89q/jnbt/NBTConstants.java

@@ -54,7 +54,7 @@ public final class NBTConstants {
     public static final int TYPE_END = 0, TYPE_BYTE = 1, TYPE_SHORT = 2,
             TYPE_INT = 3, TYPE_LONG = 4, TYPE_FLOAT = 5, TYPE_DOUBLE = 6,
             TYPE_BYTE_ARRAY = 7, TYPE_STRING = 8, TYPE_LIST = 9,
-            TYPE_COMPOUND = 10;
+            TYPE_COMPOUND = 10, TYPE_INT_ARRAY = 11;
 
     /**
      * Default private constructor.

src/main/java/com/sk89q/jnbt/NBTInputStream.java

@@ -199,6 +199,13 @@ public final class NBTInputStream implements Closeable {
             }
 
             return new CompoundTag(name, tagMap);
+        case NBTConstants.TYPE_INT_ARRAY:
+            length = is.readInt();
+            int[] data = new int[length];
+            for (int i = 0; i < length; i++) {
+                data[i] = is.readInt();
+            }
+            return new IntArrayTag(name, data);
         default:
             throw new IOException("Invalid tag type: " + type + ".");
         }

src/main/java/com/sk89q/jnbt/NBTOutputStream.java

@@ -157,6 +157,8 @@ public final class NBTOutputStream implements Closeable {
         case NBTConstants.TYPE_COMPOUND:
             writeCompoundTagPayload((CompoundTag) tag);
             break;
+        case NBTConstants.TYPE_INT_ARRAY:
+            writeIntArrayTagPayload((IntArrayTag) tag);
         default:
             throw new IOException("Invalid tag type: " + type + ".");
         }
@@ -308,6 +310,14 @@ public final class NBTOutputStream implements Closeable {
     private void writeEndTagPayload(EndTag tag) {
         /* empty */
     }
+    
+    private void writeIntArrayTagPayload(IntArrayTag tag) throws IOException {
+        int[] data = tag.getValue();
+        os.writeInt(data.length);
+        for (int i = 0; i < data.length; i++) {
+            os.writeInt(data[i]);
+        } 
+    }
 
     public void close() throws IOException {
         os.close();

src/main/java/com/sk89q/jnbt/NBTUtils.java

@@ -1,5 +1,7 @@
 package com.sk89q.jnbt;
 
+import java.util.Map;
+
 import com.sk89q.jnbt.ByteArrayTag;
 import com.sk89q.jnbt.ByteTag;
 import com.sk89q.jnbt.CompoundTag;
@@ -13,6 +15,7 @@ import com.sk89q.jnbt.NBTConstants;
 import com.sk89q.jnbt.ShortTag;
 import com.sk89q.jnbt.StringTag;
 import com.sk89q.jnbt.Tag;
+import com.sk89q.worldedit.data.InvalidFormatException;
 
 /*
  * JNBT License
@@ -85,6 +88,8 @@ public final class NBTUtils {
             return "TAG_Short";
         } else if (clazz.equals(StringTag.class)) {
             return "TAG_String";
+        } else if (clazz.equals(IntArrayTag.class)) {
+            return "TAG_Int_Array";
         } else {
             throw new IllegalArgumentException("Invalid tag classs ("
                     + clazz.getName() + ").");
@@ -123,6 +128,8 @@ public final class NBTUtils {
             return NBTConstants.TYPE_SHORT;
         } else if (clazz.equals(StringTag.class)) {
             return NBTConstants.TYPE_STRING;
+        } else if (clazz.equals(IntArrayTag.class)) {
+            return NBTConstants.TYPE_INT_ARRAY;  
         } else {
             throw new IllegalArgumentException("Invalid tag classs ("
                     + clazz.getName() + ").");
@@ -162,6 +169,8 @@ public final class NBTUtils {
             return ListTag.class;
         case NBTConstants.TYPE_COMPOUND:
             return CompoundTag.class;
+        case NBTConstants.TYPE_INT_ARRAY:
+            return IntArrayTag.class;
         default:
             throw new IllegalArgumentException("Invalid tag type : " + type
                     + ".");
@@ -174,5 +183,26 @@ public final class NBTUtils {
     private NBTUtils() {
 
     }
+    
+    /**
+     * Get child tag of a NBT structure.
+     *
+     * @param items
+     * @param key
+     * @param expected
+     * @return child tag
+     * @throws InvalidFormatException
+     */
+    public static <T extends Tag> T getChildTag(Map<String,Tag> items, String key,
+            Class<T> expected) throws InvalidFormatException {
+        if (!items.containsKey(key)) {
+            throw new InvalidFormatException("Missing a \"" + key + "\" tag");
+        }
+        Tag tag = items.get(key);
+        if (!expected.isInstance(tag)) {
+            throw new InvalidFormatException(key + " tag is not of tag type " + expected.getName());
+        }
+        return expected.cast(tag);
+    }
 
 }

src/main/java/com/sk89q/worldedit/blocks/ChestBlock.java

@@ -150,7 +150,7 @@ public class ChestBlock extends BaseBlock implements TileEntityBlock, ContainerB
             throw new DataException("'Chest' tile entity expected");
         }
 
-        ListTag items = (ListTag) Chunk.getChildTag(values, "Items", ListTag.class);
+        ListTag items = (ListTag) NBTUtils.getChildTag(values, "Items", ListTag.class);
         BaseItemStack[] newItems = new BaseItemStack[27];
 
         for (Tag tag : items.getValue()) {
@@ -161,20 +161,20 @@ public class ChestBlock extends BaseBlock implements TileEntityBlock, ContainerB
             CompoundTag item = (CompoundTag) tag;
             Map<String, Tag> itemValues = item.getValue();
 
-            short id = Chunk.getChildTag(itemValues, "id", ShortTag.class).getValue();
-            short damage = Chunk.getChildTag(itemValues, "Damage", ShortTag.class).getValue();
-            byte count = Chunk.getChildTag(itemValues, "Count", ByteTag.class).getValue();
-            byte slot = Chunk.getChildTag(itemValues, "Slot", ByteTag.class).getValue();
+            short id = NBTUtils.getChildTag(itemValues, "id", ShortTag.class).getValue();
+            short damage = NBTUtils.getChildTag(itemValues, "Damage", ShortTag.class).getValue();
+            byte count = NBTUtils.getChildTag(itemValues, "Count", ByteTag.class).getValue();
+            byte slot = NBTUtils.getChildTag(itemValues, "Slot", ByteTag.class).getValue();
 
             if (slot >= 0 && slot <= 26) {
                 BaseItemStack itemstack = new BaseItemStack(id, count, damage);
 
                 if(itemValues.containsKey("tag")) {
-                    ListTag ench = (ListTag) Chunk.getChildTag(itemValues, "tag", CompoundTag.class).getValue().get("ench");
+                    ListTag ench = (ListTag) NBTUtils.getChildTag(itemValues, "tag", CompoundTag.class).getValue().get("ench");
                     for(Tag e : ench.getValue()) {
                         Map<String, Tag> vars = ((CompoundTag) e).getValue();
-                        short enchid = Chunk.getChildTag(vars, "id", ShortTag.class).getValue();
-                        short enchlvl = Chunk.getChildTag(vars, "lvl", ShortTag.class).getValue();
+                        short enchid = NBTUtils.getChildTag(vars, "id", ShortTag.class).getValue();
+                        short enchlvl = NBTUtils.getChildTag(vars, "lvl", ShortTag.class).getValue();
                         itemstack.getEnchantments().put((int) enchid, (int)enchlvl);
                     }
                 }

src/main/java/com/sk89q/worldedit/blocks/DispenserBlock.java

@@ -150,7 +150,7 @@ public class DispenserBlock extends BaseBlock implements TileEntityBlock, Contai
             throw new DataException("'Trap' tile entity expected");
         }
 
-        ListTag items = (ListTag) Chunk.getChildTag(values, "Items", ListTag.class);
+        ListTag items = (ListTag) NBTUtils.getChildTag(values, "Items", ListTag.class);
         BaseItemStack[] newItems = new BaseItemStack[9];
 
         for (Tag tag : items.getValue()) {
@@ -161,20 +161,20 @@ public class DispenserBlock extends BaseBlock implements TileEntityBlock, Contai
             CompoundTag item = (CompoundTag) tag;
             Map<String, Tag> itemValues = item.getValue();
 
-            short id = Chunk.getChildTag(itemValues, "id", ShortTag.class).getValue();
-            short damage = Chunk.getChildTag(itemValues, "Damage", ShortTag.class).getValue();
-            byte count = Chunk.getChildTag(itemValues, "Count", ByteTag.class).getValue();
-            byte slot = Chunk.getChildTag(itemValues, "Slot", ByteTag.class).getValue();
+            short id = NBTUtils.getChildTag(itemValues, "id", ShortTag.class).getValue();
+            short damage = NBTUtils.getChildTag(itemValues, "Damage", ShortTag.class).getValue();
+            byte count = NBTUtils.getChildTag(itemValues, "Count", ByteTag.class).getValue();
+            byte slot = NBTUtils.getChildTag(itemValues, "Slot", ByteTag.class).getValue();
 
             if (slot >= 0 && slot <= 8) {
                 BaseItemStack itemstack = new BaseItemStack(id, count, damage);
 
                 if(itemValues.containsKey("tag")) {
-                    ListTag ench = (ListTag) Chunk.getChildTag(itemValues, "tag", CompoundTag.class).getValue().get("ench");
+                    ListTag ench = (ListTag) NBTUtils.getChildTag(itemValues, "tag", CompoundTag.class).getValue().get("ench");
                     for(Tag e : ench.getValue()) {
                         Map<String, Tag> vars = ((CompoundTag) e).getValue();
-                        short enchid = Chunk.getChildTag(vars, "id", ShortTag.class).getValue();
-                        short enchlvl = Chunk.getChildTag(vars, "lvl", ShortTag.class).getValue();
+                        short enchid = NBTUtils.getChildTag(vars, "id", ShortTag.class).getValue();
+                        short enchlvl = NBTUtils.getChildTag(vars, "lvl", ShortTag.class).getValue();
                         itemstack.getEnchantments().put((int) enchid, (int)enchlvl);
                     }
                 }

src/main/java/com/sk89q/worldedit/blocks/FurnaceBlock.java

@@ -194,7 +194,7 @@ public class FurnaceBlock extends BaseBlock implements TileEntityBlock, Containe
             throw new DataException("'Furnace' tile entity expected");
         }
 
-        ListTag items = (ListTag) Chunk.getChildTag(values, "Items", ListTag.class);
+        ListTag items = (ListTag) NBTUtils.getChildTag(values, "Items", ListTag.class);
         BaseItemStack[] newItems = new BaseItemStack[3];
 
         for (Tag tag : items.getValue()) {
@@ -205,20 +205,20 @@ public class FurnaceBlock extends BaseBlock implements TileEntityBlock, Containe
             CompoundTag item = (CompoundTag) tag;
             Map<String, Tag> itemValues = item.getValue();
 
-            short id = Chunk.getChildTag(itemValues, "id", ShortTag.class).getValue();
-            short damage = Chunk.getChildTag(itemValues, "Damage", ShortTag.class).getValue();
-            byte count = Chunk.getChildTag(itemValues, "Count", ByteTag.class).getValue();
-            byte slot = Chunk.getChildTag(itemValues, "Slot", ByteTag.class).getValue();
+            short id = NBTUtils.getChildTag(itemValues, "id", ShortTag.class).getValue();
+            short damage = NBTUtils.getChildTag(itemValues, "Damage", ShortTag.class).getValue();
+            byte count = NBTUtils.getChildTag(itemValues, "Count", ByteTag.class).getValue();
+            byte slot = NBTUtils.getChildTag(itemValues, "Slot", ByteTag.class).getValue();
 
             if (slot >= 0 && slot <= 2) {
                 BaseItemStack itemstack = new BaseItemStack(id, count, damage);
 
                 if(itemValues.containsKey("tag")) {
-                    ListTag ench = (ListTag) Chunk.getChildTag(itemValues, "tag", CompoundTag.class).getValue().get("ench");
+                    ListTag ench = (ListTag) NBTUtils.getChildTag(itemValues, "tag", CompoundTag.class).getValue().get("ench");
                     for(Tag e : ench.getValue()) {
                         Map<String, Tag> vars = ((CompoundTag) e).getValue();
-                        short enchid = Chunk.getChildTag(vars, "id", ShortTag.class).getValue();
-                        short enchlvl = Chunk.getChildTag(vars, "lvl", ShortTag.class).getValue();
+                        short enchid = NBTUtils.getChildTag(vars, "id", ShortTag.class).getValue();
+                        short enchlvl = NBTUtils.getChildTag(vars, "lvl", ShortTag.class).getValue();
                         itemstack.getEnchantments().put((int) enchid, (int)enchlvl);
                     }
                 }

src/main/java/com/sk89q/worldedit/blocks/MobSpawnerBlock.java

@@ -151,8 +151,8 @@ public class MobSpawnerBlock extends BaseBlock implements TileEntityBlock {
             throw new DataException("'MobSpawner' tile entity expected");
         }
 
-        StringTag mobTypeTag = (StringTag) Chunk.getChildTag(values, "EntityId", StringTag.class);
-        ShortTag delayTag = (ShortTag) Chunk.getChildTag(values, "Delay", ShortTag.class);
+        StringTag mobTypeTag = (StringTag) NBTUtils.getChildTag(values, "EntityId", StringTag.class);
+        ShortTag delayTag = (ShortTag) NBTUtils.getChildTag(values, "Delay", ShortTag.class);
 
         this.mobType = mobTypeTag.getValue();
         this.delay = delayTag.getValue();

src/main/java/com/sk89q/worldedit/data/AnvilChunk.java

@@ -0,0 +1,223 @@
+package com.sk89q.worldedit.data;
+
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import com.sk89q.jnbt.ByteArrayTag;
+import com.sk89q.jnbt.ByteTag;
+import com.sk89q.jnbt.CompoundTag;
+import com.sk89q.jnbt.IntTag;
+import com.sk89q.jnbt.ListTag;
+import com.sk89q.jnbt.NBTUtils;
+import com.sk89q.jnbt.Tag;
+import com.sk89q.worldedit.BlockVector;
+import com.sk89q.worldedit.LocalWorld;
+import com.sk89q.worldedit.Vector;
+import com.sk89q.worldedit.blocks.BaseBlock;
+import com.sk89q.worldedit.blocks.BlockID;
+import com.sk89q.worldedit.blocks.ChestBlock;
+import com.sk89q.worldedit.blocks.DispenserBlock;
+import com.sk89q.worldedit.blocks.FurnaceBlock;
+import com.sk89q.worldedit.blocks.MobSpawnerBlock;
+import com.sk89q.worldedit.blocks.NoteBlock;
+import com.sk89q.worldedit.blocks.SignBlock;
+import com.sk89q.worldedit.blocks.TileEntityBlock;
+
+public class AnvilChunk implements Chunk {
+
+    private CompoundTag rootTag;
+    private byte[][] blocks;
+    private byte[][] data;
+    private int rootX;
+    private int rootZ;
+
+    private Map<BlockVector, Map<String,Tag>> tileEntities;
+    @SuppressWarnings("unused")
+    private LocalWorld world; // TODO: remove if stays unused.
+
+    /**
+     * Construct the chunk with a compound tag.
+     *
+     * @param tag
+     * @throws DataException
+     */
+    public AnvilChunk(LocalWorld world, CompoundTag tag) throws DataException {
+        rootTag = tag;
+        this.world = world;
+
+        rootX = NBTUtils.getChildTag( rootTag.getValue(), "xPos", IntTag.class).getValue();
+        rootZ = NBTUtils.getChildTag( rootTag.getValue(), "zPos", IntTag.class).getValue();
+
+        blocks = new byte[16][16*16*16];
+        data = new byte[16][16*16*8];
+        List<Tag> sections = NBTUtils.getChildTag(rootTag.getValue(), "Sections", ListTag.class).getValue();
+        for(Tag section : sections) {
+            if(!(section instanceof CompoundTag)) continue;
+            CompoundTag compoundsection = (CompoundTag) section;
+            if(!compoundsection.getValue().containsKey("Y")) continue; // Empty section.
+            int y = NBTUtils.getChildTag(compoundsection.getValue(), "Y", ByteTag.class).getValue();
+            if(y < 0 || y >= 16) continue;
+            blocks[y]  = NBTUtils.getChildTag(compoundsection.getValue(), "Blocks", ByteArrayTag.class).getValue();
+            data[y]  = NBTUtils.getChildTag(compoundsection.getValue(), "Data", ByteArrayTag.class).getValue();
+        }
+        
+        int sectionsize = 16*16*16;
+        for(int i = 0; i < blocks.length; i++) {
+            if (blocks[i].length != sectionsize) {
+                throw new InvalidFormatException("Chunk blocks byte array expected "
+                        + "to be " + sectionsize + " bytes; found " + blocks[i].length);
+            }
+        }
+
+        for(int i = 0; i < data.length; i++) {
+            if (data[i].length != (sectionsize/2)) {
+                throw new InvalidFormatException("Chunk block data byte array "
+                        + "expected to be " + sectionsize + " bytes; found " + data[i].length);
+            }
+        }
+    }
+    
+    @Override
+    public int getBlockID(Vector pos) throws DataException {
+        int x = pos.getBlockX() - rootX * 16;
+        int y = pos.getBlockY();
+        int z = pos.getBlockZ() - rootZ * 16;
+        
+        int section = y >> 4;
+        if(section < 0 || section >= blocks.length) throw new DataException("Chunk does not contain position " + pos);
+        int yindex = y & 0x0F;
+        if(yindex < 0 || yindex >= 16) throw new DataException("Chunk does not contain position " + pos);
+        
+        
+        int index = x + (z * 16 + (yindex * 16 * 16));
+        try {
+            return blocks[section][index];
+        } catch (IndexOutOfBoundsException e) {
+            throw new DataException("Chunk does not contain position " + pos);
+        }
+    }
+
+    @Override
+    public int getBlockData(Vector pos) throws DataException {
+        int x = pos.getBlockX() - rootX * 16;
+        int y = pos.getBlockY();
+        int z = pos.getBlockZ() - rootZ * 16;
+        
+        int section = y >> 4;
+        if(section < 0 || section >= blocks.length) throw new DataException("Chunk does not contain position " + pos);
+        int yindex = y & 0x0F;
+        if(yindex < 0 || yindex >= 16) throw new DataException("Chunk does not contain position " + pos);
+        
+        
+        int index = x + (z * 16 + (yindex * 16 * 16));
+        boolean shift = index % 2 == 0;
+        index /= 2;
+
+        try {
+            if (!shift) {
+                return (data[section][index] & 0xF0) >> 4;
+            } else {
+                return data[section][index] & 0xF;
+            }
+        } catch (IndexOutOfBoundsException e) {
+            throw new DataException("Chunk does not contain position " + pos);
+        }
+    }
+
+    /**
+     * Used to load the tile entities.
+     *
+     * @throws DataException
+     */
+    private void populateTileEntities() throws DataException {
+        List<Tag> tags = NBTUtils.getChildTag(
+                rootTag.getValue(), "TileEntities", ListTag.class)
+                .getValue();
+
+        tileEntities = new HashMap<BlockVector, Map<String, Tag>>();
+
+        for (Tag tag : tags) {
+            if (!(tag instanceof CompoundTag)) {
+                throw new InvalidFormatException("CompoundTag expected in TileEntities");
+            }
+
+            CompoundTag t = (CompoundTag) tag;
+
+            int x = 0;
+            int y = 0;
+            int z = 0;
+
+            Map<String, Tag> values = new HashMap<String, Tag>();
+
+            for (Map.Entry<String, Tag> entry : t.getValue().entrySet()) {
+                if (entry.getKey().equals("x")) {
+                    if (entry.getValue() instanceof IntTag) {
+                        x = ((IntTag) entry.getValue()).getValue();
+                    }
+                } else if (entry.getKey().equals("y")) {
+                    if (entry.getValue() instanceof IntTag) {
+                        y = ((IntTag) entry.getValue()).getValue();
+                    }
+                } else if (entry.getKey().equals("z")) {
+                    if (entry.getValue() instanceof IntTag) {
+                        z = ((IntTag) entry.getValue()).getValue();
+                    }
+                }
+
+                values.put(entry.getKey(), entry.getValue());
+            }
+
+            BlockVector vec = new BlockVector(x, y, z);
+            tileEntities.put(vec, values);
+        }
+    }
+
+    /**
+     * Get the map of tags keyed to strings for a block's tile entity data. May
+     * return null if there is no tile entity data. Not public yet because
+     * what this function returns isn't ideal for usage.
+     *
+     * @param pos
+     * @return
+     * @throws DataException
+     */
+    private Map<String, Tag> getBlockTileEntity(Vector pos) throws DataException {
+        if (tileEntities == null) {
+            populateTileEntities();
+        }
+
+        return tileEntities.get(new BlockVector(pos));
+    }
+
+    @Override
+    public BaseBlock getBlock(Vector pos) throws DataException {
+        int id = getBlockID(pos);
+        int data = getBlockData(pos);
+        BaseBlock block;
+
+        if (id == BlockID.WALL_SIGN || id == BlockID.SIGN_POST) {
+            block = new SignBlock(id, data);
+        } else if (id == BlockID.CHEST) {
+            block = new ChestBlock(data);
+        } else if (id == BlockID.FURNACE || id == BlockID.BURNING_FURNACE) {
+            block = new FurnaceBlock(id, data);
+        } else if (id == BlockID.DISPENSER) {
+            block = new DispenserBlock(data);
+        } else if (id == BlockID.MOB_SPAWNER) {
+            block = new MobSpawnerBlock(data);
+        } else if (id == BlockID.NOTE_BLOCK) {
+            block = new NoteBlock(data);
+        } else {
+            block = new BaseBlock(id, data);
+        }
+
+        if (block instanceof TileEntityBlock) {
+            Map<String, Tag> tileEntity = getBlockTileEntity(pos);
+            ((TileEntityBlock) block).fromTileEntityNBT(tileEntity);
+        }
+
+        return block;
+    }
+
+}

src/main/java/com/sk89q/worldedit/data/Chunk.java

@@ -1,75 +1,9 @@
-// $Id$
-/*
- * WorldEdit
- * Copyright (C) 2010 sk89q <http://www.sk89q.com> and contributors
- *
- * This program is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
-*/
-
 package com.sk89q.worldedit.data;
 
-import java.util.List;
-import java.util.Map;
-import java.util.HashMap;
-import com.sk89q.jnbt.*;
-import com.sk89q.worldedit.*;
-import com.sk89q.worldedit.blocks.*;
+import com.sk89q.worldedit.Vector;
+import com.sk89q.worldedit.blocks.BaseBlock;
 
-/**
- * Represents a chunk.
- *
- * @author sk89q
- */
-public class Chunk {
-    private CompoundTag rootTag;
-    private byte[] blocks;
-    private byte[] data;
-    private int rootX;
-    private int rootZ;
-
-    private Map<BlockVector, Map<String,Tag>> tileEntities;
-    private LocalWorld world;
-
-    /**
-     * Construct the chunk with a compound tag.
-     *
-     * @param tag
-     * @throws DataException
-     */
-    public Chunk(LocalWorld world, CompoundTag tag) throws DataException {
-        rootTag = tag;
-        this.world = world;
-
-        blocks = getChildTag(
-                rootTag.getValue(), "Blocks", ByteArrayTag.class).getValue();
-        data = getChildTag(
-                rootTag.getValue(), "Data", ByteArrayTag.class).getValue();
-        rootX = getChildTag(
-                rootTag.getValue(), "xPos", IntTag.class).getValue();
-        rootZ = getChildTag(
-                rootTag.getValue(), "zPos", IntTag.class).getValue();
-
-        if (blocks.length != 16*16*(world.getMaxY() + 1)) {
-            throw new InvalidFormatException("Chunk blocks byte array expected "
-                    + "to be " + 16*16*(world.getMaxY() + 1) + " bytes; found " + blocks.length);
-        }
-
-        if (data.length != 16*16*((world.getMaxY() + 1)/2)) {
-            throw new InvalidFormatException("Chunk block data byte array "
-                    + "expected to be " + 16*16*((world.getMaxY() + 1)/2) + " bytes; found " + data.length);
-        }
-    }
+public interface Chunk {
 
     /**
      * Get the block ID of a block.
@@ -78,19 +12,8 @@ public class Chunk {
      * @return
      * @throws DataException
      */
-    public int getBlockID(Vector pos) throws DataException {
-        int x = pos.getBlockX() - rootX * 16;
-        int y = pos.getBlockY();
-        int z = pos.getBlockZ() - rootZ * 16;
-        int index = y + (z * (world.getMaxY() + 1) + (x * (world.getMaxY() + 1) * 16));
-
-        try {
-            return blocks[index];
-        } catch (IndexOutOfBoundsException e) {
-            throw new DataException("Chunk does not contain position " + pos);
-        }
-    }
-
+    public int getBlockID(Vector pos) throws DataException;
+    
     /**
      * Get the block data of a block.
      *
@@ -98,90 +21,9 @@ public class Chunk {
      * @return
      * @throws DataException
      */
-    public int getBlockData(Vector pos) throws DataException {
-        int x = pos.getBlockX() - rootX * 16;
-        int y = pos.getBlockY();
-        int z = pos.getBlockZ() - rootZ * 16;
-        int index = y + (z * (world.getMaxY() + 1) + (x * (world.getMaxY() + 1) * 16));
-        boolean shift = index % 2 == 0;
-        index /= 2;
-
-        try {
-            if (!shift) {
-                return (data[index] & 0xF0) >> 4;
-            } else {
-                return data[index] & 0xF;
-            }
-        } catch (IndexOutOfBoundsException e) {
-            throw new DataException("Chunk does not contain position " + pos);
-        }
-    }
-
-    /**
-     * Used to load the tile entities.
-     *
-     * @throws DataException
-     */
-    private void populateTileEntities() throws DataException {
-        List<Tag> tags = getChildTag(
-                rootTag.getValue(), "TileEntities", ListTag.class)
-                .getValue();
-
-        tileEntities = new HashMap<BlockVector, Map<String, Tag>>();
-
-        for (Tag tag : tags) {
-            if (!(tag instanceof CompoundTag)) {
-                throw new InvalidFormatException("CompoundTag expected in TileEntities");
-            }
-
-            CompoundTag t = (CompoundTag) tag;
-
-            int x = 0;
-            int y = 0;
-            int z = 0;
-
-            Map<String, Tag> values = new HashMap<String, Tag>();
-
-            for (Map.Entry<String, Tag> entry : t.getValue().entrySet()) {
-                if (entry.getKey().equals("x")) {
-                    if (entry.getValue() instanceof IntTag) {
-                        x = ((IntTag) entry.getValue()).getValue();
-                    }
-                } else if (entry.getKey().equals("y")) {
-                    if (entry.getValue() instanceof IntTag) {
-                        y = ((IntTag) entry.getValue()).getValue();
-                    }
-                } else if (entry.getKey().equals("z")) {
-                    if (entry.getValue() instanceof IntTag) {
-                        z = ((IntTag) entry.getValue()).getValue();
-                    }
-                }
-
-                values.put(entry.getKey(), entry.getValue());
-            }
-
-            BlockVector vec = new BlockVector(x, y, z);
-            tileEntities.put(vec, values);
-        }
-    }
-
-    /**
-     * Get the map of tags keyed to strings for a block's tile entity data. May
-     * return null if there is no tile entity data. Not public yet because
-     * what this function returns isn't ideal for usage.
-     *
-     * @param pos
-     * @return
-     * @throws DataException
-     */
-    private Map<String, Tag> getBlockTileEntity(Vector pos) throws DataException {
-        if (tileEntities == null) {
-            populateTileEntities();
-        }
-
-        return tileEntities.get(new BlockVector(pos));
-    }
-
+    public int getBlockData(Vector pos) throws DataException;
+    
+    
     /**
      * Get a block;
      *
@@ -189,54 +31,5 @@ public class Chunk {
      * @return block
      * @throws DataException
      */
-    public BaseBlock getBlock(Vector pos) throws DataException {
-        int id = getBlockID(pos);
-        int data = getBlockData(pos);
-        BaseBlock block;
-
-        if (id == BlockID.WALL_SIGN || id == BlockID.SIGN_POST) {
-            block = new SignBlock(id, data);
-        } else if (id == BlockID.CHEST) {
-            block = new ChestBlock(data);
-        } else if (id == BlockID.FURNACE || id == BlockID.BURNING_FURNACE) {
-            block = new FurnaceBlock(id, data);
-        } else if (id == BlockID.DISPENSER) {
-            block = new DispenserBlock(data);
-        } else if (id == BlockID.MOB_SPAWNER) {
-            block = new MobSpawnerBlock(data);
-        } else if (id == BlockID.NOTE_BLOCK) {
-            block = new NoteBlock(data);
-        } else {
-            block = new BaseBlock(id, data);
-        }
-
-        if (block instanceof TileEntityBlock) {
-            Map<String, Tag> tileEntity = getBlockTileEntity(pos);
-            ((TileEntityBlock) block).fromTileEntityNBT(tileEntity);
-        }
-
-        return block;
-    }
-
-    /**
-     * Get child tag of a NBT structure.
-     *
-     * @param items
-     * @param key
-     * @param expected
-     * @return child tag
-     * @throws InvalidFormatException
-     */
-    @SuppressWarnings("unchecked")
-    public static <T extends Tag> T getChildTag(Map<String,Tag> items, String key,
-            Class<T> expected) throws InvalidFormatException {
-        if (!items.containsKey(key)) {
-            throw new InvalidFormatException("Missing a \"" + key + "\" tag");
-        }
-        Tag tag = items.get(key);
-        if (!expected.isInstance(tag)) {
-            throw new InvalidFormatException(key + " tag is not of tag type " + expected.getName());
-        }
-        return (T) tag;
-    }
+    public BaseBlock getBlock(Vector pos) throws DataException;
 }

src/main/java/com/sk89q/worldedit/data/ChunkStore.java

@@ -20,6 +20,8 @@
 package com.sk89q.worldedit.data;
 
 import java.io.IOException;
+import java.util.Map;
+
 import com.sk89q.jnbt.*;
 import com.sk89q.worldedit.*;
 
@@ -64,7 +66,13 @@ public abstract class ChunkStore {
      */
     public Chunk getChunk(Vector2D pos, LocalWorld world)
             throws DataException, IOException {
-        return new Chunk(world, getChunkTag(pos, world));
+        
+        CompoundTag tag = getChunkTag(pos, world);
+        Map<String, Tag> tags = tag.getValue();
+        if(tags.containsKey("Sections")) {
+            return new AnvilChunk(world, tag);
+        }
+        return new OldChunk(world, tag);
     }
 
     /**

src/main/java/com/sk89q/worldedit/data/FileMcRegionChunkStore.java

@@ -45,7 +45,13 @@ public class FileMcRegionChunkStore extends McRegionChunkStore {
     protected InputStream getInputStream(String name, String world) throws IOException,
             DataException {
         String fileName = "region" + File.separator + name;
-        File file = new File(path, fileName);
+        File file = new File(path, fileName.replace("mcr", "mca")); // TODO: does this need a separate class?
+        if (!file.exists()) {
+            file = new File(path, fileName);
+        }
+        if (!file.exists()) {
+            file = new File(path, "DIM-1" + File.separator + fileName.replace("mcr", "mca")); // TODO: does this need a separate class?
+        }
         if (!file.exists()) {
             file = new File(path, "DIM-1" + File.separator + fileName);
         }

src/main/java/com/sk89q/worldedit/data/OldChunk.java

@@ -0,0 +1,205 @@
+// $Id$
+/*
+ * WorldEdit
+ * Copyright (C) 2010 sk89q <http://www.sk89q.com> and contributors
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package com.sk89q.worldedit.data;
+
+import java.util.List;
+import java.util.Map;
+import java.util.HashMap;
+import com.sk89q.jnbt.*;
+import com.sk89q.worldedit.*;
+import com.sk89q.worldedit.blocks.*;
+
+/**
+ * Represents a chunk.
+ *
+ * @author sk89q
+ */
+public class OldChunk implements Chunk {
+    private CompoundTag rootTag;
+    private byte[] blocks;
+    private byte[] data;
+    private int rootX;
+    private int rootZ;
+
+    private Map<BlockVector, Map<String,Tag>> tileEntities;
+    @SuppressWarnings("unused")
+    private LocalWorld world; // TODO: remove if stays unused.
+
+    /**
+     * Construct the chunk with a compound tag.
+     *
+     * @param tag
+     * @throws DataException
+     */
+    public OldChunk(LocalWorld world, CompoundTag tag) throws DataException {
+        rootTag = tag;
+        this.world = world;
+
+        
+        blocks = NBTUtils.getChildTag(rootTag.getValue(), "Blocks", ByteArrayTag.class).getValue();
+        data = NBTUtils.getChildTag(  rootTag.getValue(), "Data", ByteArrayTag.class).getValue();
+        rootX = NBTUtils.getChildTag( rootTag.getValue(), "xPos", IntTag.class).getValue();
+        rootZ = NBTUtils.getChildTag( rootTag.getValue(), "zPos", IntTag.class).getValue();
+
+        int size = 16 * 16 * 128;
+        if (blocks.length != size) {
+            throw new InvalidFormatException("Chunk blocks byte array expected "
+                    + "to be " + size + " bytes; found " + blocks.length);
+        }
+
+        if (data.length != (size/2)) {
+            throw new InvalidFormatException("Chunk block data byte array "
+                    + "expected to be " + size + " bytes; found " + data.length);
+        }
+    }
+
+    @Override
+    public int getBlockID(Vector pos) throws DataException {
+        if(pos.getBlockY() >= 128) return 0;
+        
+        int x = pos.getBlockX() - rootX * 16;
+        int y = pos.getBlockY();
+        int z = pos.getBlockZ() - rootZ * 16;
+        int index = y + (z * 128 + (x * 128 * 16));
+        try {
+            return blocks[index];
+        } catch (IndexOutOfBoundsException e) {
+            throw new DataException("Chunk does not contain position " + pos);
+        }
+    }
+
+    @Override
+    public int getBlockData(Vector pos) throws DataException {
+        if(pos.getBlockY() >= 128) return 0;
+        
+        int x = pos.getBlockX() - rootX * 16;
+        int y = pos.getBlockY();
+        int z = pos.getBlockZ() - rootZ * 16;
+        int index = y + (z * 128 + (x * 128 * 16));
+        boolean shift = index % 2 == 0;
+        index /= 2;
+
+        try {
+            if (!shift) {
+                return (data[index] & 0xF0) >> 4;
+            } else {
+                return data[index] & 0xF;
+            }
+        } catch (IndexOutOfBoundsException e) {
+            throw new DataException("Chunk does not contain position " + pos);
+        }
+    }
+
+    /**
+     * Used to load the tile entities.
+     *
+     * @throws DataException
+     */
+    private void populateTileEntities() throws DataException {
+        List<Tag> tags = NBTUtils.getChildTag(
+                rootTag.getValue(), "TileEntities", ListTag.class)
+                .getValue();
+
+        tileEntities = new HashMap<BlockVector, Map<String, Tag>>();
+
+        for (Tag tag : tags) {
+            if (!(tag instanceof CompoundTag)) {
+                throw new InvalidFormatException("CompoundTag expected in TileEntities");
+            }
+
+            CompoundTag t = (CompoundTag) tag;
+
+            int x = 0;
+            int y = 0;
+            int z = 0;
+
+            Map<String, Tag> values = new HashMap<String, Tag>();
+
+            for (Map.Entry<String, Tag> entry : t.getValue().entrySet()) {
+                if (entry.getKey().equals("x")) {
+                    if (entry.getValue() instanceof IntTag) {
+                        x = ((IntTag) entry.getValue()).getValue();
+                    }
+                } else if (entry.getKey().equals("y")) {
+                    if (entry.getValue() instanceof IntTag) {
+                        y = ((IntTag) entry.getValue()).getValue();
+                    }
+                } else if (entry.getKey().equals("z")) {
+                    if (entry.getValue() instanceof IntTag) {
+                        z = ((IntTag) entry.getValue()).getValue();
+                    }
+                }
+
+                values.put(entry.getKey(), entry.getValue());
+            }
+
+            BlockVector vec = new BlockVector(x, y, z);
+            tileEntities.put(vec, values);
+        }
+    }
+
+    /**
+     * Get the map of tags keyed to strings for a block's tile entity data. May
+     * return null if there is no tile entity data. Not public yet because
+     * what this function returns isn't ideal for usage.
+     *
+     * @param pos
+     * @return
+     * @throws DataException
+     */
+    private Map<String, Tag> getBlockTileEntity(Vector pos) throws DataException {
+        if (tileEntities == null) {
+            populateTileEntities();
+        }
+
+        return tileEntities.get(new BlockVector(pos));
+    }
+
+    @Override
+    public BaseBlock getBlock(Vector pos) throws DataException {
+        int id = getBlockID(pos);
+        int data = getBlockData(pos);
+        BaseBlock block;
+
+        if (id == BlockID.WALL_SIGN || id == BlockID.SIGN_POST) {
+            block = new SignBlock(id, data);
+        } else if (id == BlockID.CHEST) {
+            block = new ChestBlock(data);
+        } else if (id == BlockID.FURNACE || id == BlockID.BURNING_FURNACE) {
+            block = new FurnaceBlock(id, data);
+        } else if (id == BlockID.DISPENSER) {
+            block = new DispenserBlock(data);
+        } else if (id == BlockID.MOB_SPAWNER) {
+            block = new MobSpawnerBlock(data);
+        } else if (id == BlockID.NOTE_BLOCK) {
+            block = new NoteBlock(data);
+        } else {
+            block = new BaseBlock(id, data);
+        }
+
+        if (block instanceof TileEntityBlock) {
+            Map<String, Tag> tileEntity = getBlockTileEntity(pos);
+            ((TileEntityBlock) block).fromTileEntityNBT(tileEntity);
+        }
+
+        return block;
+    }
+
+}

src/main/java/com/sk89q/worldedit/data/TrueZipMcRegionChunkStore.java

@@ -101,12 +101,20 @@ public class TrueZipMcRegionChunkStore extends McRegionChunkStore {
             }
         } else {
             Pattern pattern = Pattern.compile(".*\\.mcr$");
+            Pattern patternmca = Pattern.compile(".*\\.mca$"); // TODO: does this need a separate class?
             // World pattern
             Pattern worldPattern = Pattern.compile(worldname + "\\$");
             for (Enumeration<? extends ZipEntry> e = zip.entries(); e.hasMoreElements(); ) {
                 ZipEntry testEntry = (ZipEntry) e.nextElement();
                 // Check for world
                 if (worldPattern.matcher(worldname).matches()) {
+                    // Check for file
+                    // TODO: does this need a separate class?
+                    if (patternmca.matcher(testEntry.getName()).matches()) {
+                        folder = testEntry.getName().substring(0, testEntry.getName().lastIndexOf("/"));
+                        name = folder + "/" + name.replace("mcr", "mca");
+                        break;
+                    }
                     // Check for file
                     if (pattern.matcher(testEntry.getName()).matches()) {
                         folder = testEntry.getName().substring(0, testEntry.getName().lastIndexOf("/"));
@@ -164,7 +172,7 @@ public class TrueZipMcRegionChunkStore extends McRegionChunkStore {
 
             ZipEntry testEntry = e.nextElement();
 
-            if (testEntry.getName().matches(".*\\.mcr$")) {
+            if (testEntry.getName().matches(".*\\.mcr$") || testEntry.getName().matches(".*\\.mca$")) { // TODO: does this need a separate class?
                 return true;
             }
         }

src/main/java/com/sk89q/worldedit/data/ZippedMcRegionChunkStore.java

@@ -99,10 +99,17 @@ public class ZippedMcRegionChunkStore extends McRegionChunkStore {
             }
         } else {
             Pattern pattern = Pattern.compile(".*\\.mcr$");
+            Pattern patternmca = Pattern.compile(".*\\.mca$"); // TODO: does this need a separate class?
             for (Enumeration<? extends ZipEntry> e = zip.entries(); e.hasMoreElements(); ) {
                 ZipEntry testEntry = (ZipEntry) e.nextElement();
                 // Check for world
                 if (testEntry.getName().startsWith(worldname + "/")) {
+                    // TODO: does this need a separate class?
+                    if (patternmca.matcher(testEntry.getName()).matches()) {
+                        folder = testEntry.getName().substring(0, testEntry.getName().lastIndexOf("/"));
+                        name = folder + "/" + name.replace("mcr", "mca");
+                        break;
+                    }
                     if (pattern.matcher(testEntry.getName()).matches()) {
                         folder = testEntry.getName().substring(0, testEntry.getName().lastIndexOf("/"));
                         name = folder + "/" + name;
@@ -159,7 +166,7 @@ public class ZippedMcRegionChunkStore extends McRegionChunkStore {
 
             ZipEntry testEntry = e.nextElement();
 
-            if (testEntry.getName().matches(".*\\.mcr$")) {
+            if (testEntry.getName().matches(".*\\.mcr$") || testEntry.getName().matches(".*\\.mca$")) { // TODO: does this need a separate class?
                 return true;
             }
         }

src/main/java/com/sk89q/worldedit/snapshots/SnapshotRestore.java

@@ -19,15 +19,25 @@
 
 package com.sk89q.worldedit.snapshots;
 
-import com.sk89q.worldedit.*;
-import com.sk89q.worldedit.regions.*;
-import com.sk89q.worldedit.blocks.*;
-import com.sk89q.worldedit.data.*;
 import java.io.IOException;
-import java.util.Map;
+import java.util.ArrayList;
 import java.util.LinkedHashMap;
 import java.util.List;
-import java.util.ArrayList;
+import java.util.Map;
+
+import com.sk89q.worldedit.BlockVector2D;
+import com.sk89q.worldedit.EditSession;
+import com.sk89q.worldedit.MaxChangedBlocksException;
+import com.sk89q.worldedit.Vector;
+import com.sk89q.worldedit.Vector2D;
+import com.sk89q.worldedit.blocks.BaseBlock;
+import com.sk89q.worldedit.data.Chunk;
+import com.sk89q.worldedit.data.ChunkStore;
+import com.sk89q.worldedit.data.DataException;
+import com.sk89q.worldedit.data.MissingChunkException;
+import com.sk89q.worldedit.data.MissingWorldException;
+import com.sk89q.worldedit.regions.CuboidRegion;
+import com.sk89q.worldedit.regions.Region;
 
 /**
  *