From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Mon, 29 Jun 2020 03:26:17 -0400
Subject: [PATCH] Support old UUID format for NBT

We have stored UUID in plenty of places that did not get DFU'd

So just look for old format and load it if it exists.

diff --git a/src/main/java/net/minecraft/nbt/CompoundTag.java b/src/main/java/net/minecraft/nbt/CompoundTag.java
index 1aa3af8c7714b2c850fb4264c863db8e639e6284..2a805d6bbeede50898d36258976ff25ee0aea165 100644
--- a/src/main/java/net/minecraft/nbt/CompoundTag.java
+++ b/src/main/java/net/minecraft/nbt/CompoundTag.java
@@ -121,6 +121,12 @@ public class CompoundTag implements Tag {
 
     public void setUUID(String prefix, UUID uuid) { putUUID(prefix, uuid); } // Paper - OBFHELPER
     public void putUUID(String key, UUID value) {
+        // Paper start - support old format
+        if (this.contains(key + "Most", 99) && this.contains(key + "Least", 99)) {
+            this.tags.remove(key + "Most");
+            this.tags.remove(key + "Least");
+        }
+        // Paper end
         this.tags.put(key, NbtUtils.createUUID(value));
     }
 
@@ -129,10 +135,20 @@ public class CompoundTag implements Tag {
      * You must use {@link #hasUUID(String)} before or else it <b>will</b> throw an NPE.
      */
     public UUID getUUID(String key) {
+        // Paper start - support old format
+        if (!contains(key, 11) && this.contains(key + "Most", 99) && this.contains(key + "Least", 99)) {
+            return new UUID(this.getLong(key + "Most"), this.getLong(key + "Least"));
+        }
+        // Paper end
         return NbtUtils.loadUUID(this.get(key));
     }
 
     public boolean hasUUID(String key) {
+        // Paper start - support old format
+        if (this.contains(key + "Most", 99) && this.contains(key + "Least", 99)) {
+            return true;
+        }
+        // Paper end
         Tag tag = this.get(key);
         return tag != null && tag.getType() == IntArrayTag.TYPE && ((IntArrayTag)tag).getAsIntArray().length == 4;
     }
diff --git a/src/main/java/net/minecraft/nbt/NbtUtils.java b/src/main/java/net/minecraft/nbt/NbtUtils.java
index 57c9575a9714acb95d9dced672955a96d71dfd1e..dc136cd4d5d4ba1e0e53a7187b3a2e836e185c19 100644
--- a/src/main/java/net/minecraft/nbt/NbtUtils.java
+++ b/src/main/java/net/minecraft/nbt/NbtUtils.java
@@ -40,14 +40,14 @@ import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 
 public final class NbtUtils {
-    private static final Comparator<ListTag> YXZ_LISTTAG_INT_COMPARATOR = Comparator.comparingInt((listTag) -> {
+    private static final Comparator<ListTag> YXZ_LISTTAG_INT_COMPARATOR = Comparator.<ListTag>comparingInt((listTag) -> { // Paper - decompile fix
         return listTag.getInt(1);
     }).thenComparingInt((listTag) -> {
         return listTag.getInt(0);
     }).thenComparingInt((listTag) -> {
         return listTag.getInt(2);
     });
-    private static final Comparator<ListTag> YXZ_LISTTAG_DOUBLE_COMPARATOR = Comparator.comparingDouble((listTag) -> {
+    private static final Comparator<ListTag> YXZ_LISTTAG_DOUBLE_COMPARATOR = Comparator.<ListTag>comparingDouble((listTag) -> { // Paper - decompile fix
         return listTag.getDouble(1);
     }).thenComparingDouble((listTag) -> {
         return listTag.getDouble(0);
@@ -76,6 +76,11 @@ public final class NbtUtils {
             string = compound.getString("Name");
         }
 
+        // Paper start - support string UUID's
+        if (compound.contains("Id", 8)) {
+            uUID = UUID.fromString(compound.getString("Id"));
+        }
+        // Paper end
         if (compound.hasUUID("Id")) {
             uUID = compound.getUUID("Id");
         }