diff --git a/src/OPacket53BlockChange.java b/src/OPacket53BlockChange.java
@@ -0,0 +1,115 @@
+import java.io.DataInputStream;
+import java.io.DataOutputStream;
+import java.io.IOException;
+
+public class OPacket53BlockChange extends OPacket
+{
+  public int a;
+  public int b;
+  public int c;
+  public int d;
+  public int e;
+
+  public OPacket53BlockChange()
+  {
+    this.l = true;
+  }
+
+  public OPacket53BlockChange(int paramInt1, int paramInt2, int paramInt3, OWorld paramOWorld) {
+    this.l = true;
+    this.a = paramInt1;
+    this.b = paramInt2;
+    this.c = paramInt3;
+
+    // CanaryMod start
+    if (etc.getInstance().isAntiXRayEnabled())
+    {
+        OChunk activeChunk = paramOWorld.b(a, c);
+
+        int blockID = paramOWorld.a(paramInt1, paramInt2, paramInt3);
+        // If we are attemting to send a hidden block
+        if (etc.getDataSource().getAntiXRayBlocks().contains(new Integer(blockID))) {
+            Integer index = new Integer((paramInt1 & 0xf) << 11 | (paramInt3 & 0xf) << 7 | paramInt2);
+            // If the block is supposed to be hidden
+            if (activeChunk.antiXRayBlocks.containsKey(index))
+            {
+                if (activeChunk.isHidden(paramInt1 & 0xf, paramInt2, paramInt3 & 0xf))
+                {
+                    // Send it as a stone.
+                    this.d = 1;
+                    this.e = 0;
+                }
+                else
+                {
+                    this.d = blockID;
+                    this.e = paramOWorld.c(paramInt1, paramInt2, paramInt3);
+                }
+            }
+            else
+            {
+                // This should never happen. It means the cache is not complete!
+                synchronized (activeChunk.antiXRayBlocksLock)
+                {
+                    activeChunk.antiXRayBlocks.put(index, new Integer(blockID));
+                }
+                if (activeChunk.isHidden(paramInt1 & 0xf, paramInt2, paramInt3 & 0xf))
+                {
+                    // Sent it as a stone.
+                    this.d = 1;
+                    this.e = 0;
+                }
+                else
+                {
+                    this.d = blockID;
+                    this.e = paramOWorld.c(paramInt1, paramInt2, paramInt3);
+                }
+            }
+        }
+        else
+        {
+            this.d = blockID;
+            this.e = paramOWorld.c(paramInt1, paramInt2, paramInt3);
+        }
+    }
+    else
+    {
+        this.d = paramOWorld.a(paramInt1, paramInt2, paramInt3);
+        this.e = paramOWorld.c(paramInt1, paramInt2, paramInt3);
+    }
+    // CanaryMod end
+  }
+
+  public void a(DataInputStream paramDataInputStream) {
+	  try
+	  {
+    this.a = paramDataInputStream.readInt();
+    this.b = paramDataInputStream.read();
+    this.c = paramDataInputStream.readInt();
+    this.d = paramDataInputStream.read();
+    this.e = paramDataInputStream.read();
+	  } catch (IOException e) {
+
+	  }
+  }
+
+  public void a(DataOutputStream paramDataOutputStream) {
+	  try
+	  {
+    paramDataOutputStream.writeInt(this.a);
+    paramDataOutputStream.write(this.b);
+    paramDataOutputStream.writeInt(this.c);
+    paramDataOutputStream.write(this.d);
+    paramDataOutputStream.write(this.e);
+	  } catch (IOException e) {
+
+	  }
+  }
+
+  public void a(ONetHandler paramONetHandler) {
+    paramONetHandler.a(this);
+  }
+
+  public int a() {
+    return 11;
+  }
+}