From 339953875edbac09a67868577dd25fef80871623 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Fri, 17 Jun 2016 20:50:11 -0400
Subject: [PATCH] Fix Old Sign Conversion

1) Sign loading code was trying to parse the JSON before the check for oldSign.
   That code could then skip the old sign converting code if it triggers a JSON parse exception.
2) New Mojang Schematic system has Tile Entities in the new converted format, but missing the Bukkit.isConverted flag
   This causes Igloos and such to render broken signs. We fix this by ignoring sign conversion for Defined Structures

diff --git a/src/main/java/net/minecraft/server/DefinedStructure.java b/src/main/java/net/minecraft/server/DefinedStructure.java
index d0f02f41..a8bc4b5f 100644
--- a/src/main/java/net/minecraft/server/DefinedStructure.java
+++ b/src/main/java/net/minecraft/server/DefinedStructure.java
@@ -203,9 +203,11 @@ public class DefinedStructure {
                                 definedstructure_blockinfo1.c.setInt("x", blockposition1.getX());
                                 definedstructure_blockinfo1.c.setInt("y", blockposition1.getY());
                                 definedstructure_blockinfo1.c.setInt("z", blockposition1.getZ());
+                                tileentity.isLoadingStructure = true; // Paper
                                 tileentity.a(definedstructure_blockinfo1.c);
                                 tileentity.a(definedstructureinfo.b());
                                 tileentity.a(definedstructureinfo.c());
+                                tileentity.isLoadingStructure = false; // Paper
                             }
                         }
                     }
@@ -600,7 +602,7 @@ public class DefinedStructure {
         public IBlockData a(int i) {
             IBlockData iblockdata = (IBlockData) this.b.fromId(i);
 
-            return iblockdata == null ? DefinedStructure.a.a : iblockdata;
+            return iblockdata == null ? a : iblockdata; // Paper - decompile error - Blocks.AIR.getBlockData()
         }
 
         public Iterator<IBlockData> iterator() {
diff --git a/src/main/java/net/minecraft/server/TileEntity.java b/src/main/java/net/minecraft/server/TileEntity.java
index 6e23d325..ddea15cf 100644
--- a/src/main/java/net/minecraft/server/TileEntity.java
+++ b/src/main/java/net/minecraft/server/TileEntity.java
@@ -11,6 +11,7 @@ import org.bukkit.inventory.InventoryHolder; // CraftBukkit
 public abstract class TileEntity {
 
     public Timing tickTimer = MinecraftTimings.getTileEntityTimings(this); // Paper
+    boolean isLoadingStructure = false; // Paper
     private static final Logger a = LogManager.getLogger();
     private static final RegistryMaterials<MinecraftKey, Class<? extends TileEntity>> f = new RegistryMaterials();
     protected World world;
diff --git a/src/main/java/net/minecraft/server/TileEntitySign.java b/src/main/java/net/minecraft/server/TileEntitySign.java
index 8bd12650..ba4f945a 100644
--- a/src/main/java/net/minecraft/server/TileEntitySign.java
+++ b/src/main/java/net/minecraft/server/TileEntitySign.java
@@ -77,13 +77,14 @@ public class TileEntitySign extends TileEntity {
             }
 
             try {
-                IChatBaseComponent ichatbasecomponent = IChatBaseComponent.ChatSerializer.a(s);
+                //IChatBaseComponent ichatbasecomponent = IChatBaseComponent.ChatSerializer.a(s); // Paper - move down - the old format might throw a json error
 
-                if (oldSign) {
+                if (oldSign && !isLoadingStructure) { // Paper - saved structures will be in the new format, but will not have isConverted
                     lines[i] = org.bukkit.craftbukkit.util.CraftChatMessage.fromString(s)[0];
                     continue;
                 }
                 // CraftBukkit end
+                IChatBaseComponent ichatbasecomponent = IChatBaseComponent.ChatSerializer.a(s); // Paper - after old sign
 
                 try {
                     this.lines[i] = ChatComponentUtils.filterForDisplay(icommandlistener, ichatbasecomponent, (Entity) null);
-- 
2.13.1.windows.2