Paper/patches/server/0427-Cache-block-data-strings.patch
Owen 89d51d5f29
Allow enabling sand duping (#10191)
Because this exploit has been widely known for years and has not been fixed by Mojang, we decided that it was worth allowing people to toggle it on/off due to how easy it is to make it configurable.

It should be noted that this decision does not promise all future exploits will be configurable.
2024-03-03 17:05:34 -05:00

72 lines
3.8 KiB
Diff

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: miclebrick <miclebrick@outlook.com>
Date: Thu, 6 Dec 2018 19:52:50 -0500
Subject: [PATCH] Cache block data strings
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 21176d6e57ae9e975b1e7de14b3364365cc1012d..47ad733022e5d17d839209e4163e8508e57b43c8 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -2068,6 +2068,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
this.getPlayerList().reloadResources();
this.functionManager.replaceLibrary(this.resources.managers.getFunctionLibrary());
this.structureTemplateManager.onResourceManagerReload(this.resources.resourceManager);
+ org.bukkit.craftbukkit.block.data.CraftBlockData.reloadCache(); // Paper - cache block data strings; they can be defined by datapacks so refresh it here
}, this);
if (this.isSameThread()) {
diff --git a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
index fce3fec5e1ff164b0596fdd6b3d7b5b0277253ef..587396f5ed01939cd3ddce10fecf86ba80eb9c73 100644
--- a/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
+++ b/src/main/java/org/bukkit/craftbukkit/block/data/CraftBlockData.java
@@ -154,7 +154,7 @@ public class CraftBlockData implements BlockData {
return exactMatch;
}
- private static final Map<Class<? extends Enum<?>>, Enum<?>[]> ENUM_VALUES = new HashMap<>();
+ private static final Map<Class<? extends Enum<?>>, Enum<?>[]> ENUM_VALUES = new java.util.concurrent.ConcurrentHashMap<>(); // Paper - cache block data strings; make thread safe
/**
* Convert an NMS Enum (usually a BlockStateEnum) to its appropriate Bukkit
@@ -537,9 +537,39 @@ public class CraftBlockData implements BlockData {
Preconditions.checkState(CraftBlockData.MAP.put(nms, bukkit) == null, "Duplicate mapping %s->%s", nms, bukkit);
}
+ // Paper start - cache block data strings
+ private static Map<String, CraftBlockData> stringDataCache = new java.util.concurrent.ConcurrentHashMap<>();
+
+ static {
+ // cache all of the default states at startup, will not cache ones with the custom states inside of the
+ // brackets in a different order, though
+ reloadCache();
+ }
+
+ public static void reloadCache() {
+ stringDataCache.clear();
+ Block.BLOCK_STATE_REGISTRY.forEach(blockData -> stringDataCache.put(blockData.toString(), blockData.createCraftBlockData()));
+ }
+ // Paper end - cache block data strings
+
public static CraftBlockData newData(Material material, String data) {
Preconditions.checkArgument(material == null || material.isBlock(), "Cannot get data for not block %s", material);
+ // Paper start - cache block data strings
+ if (material != null) {
+ Block block = CraftBlockType.bukkitToMinecraft(material);
+ if (block != null) {
+ net.minecraft.resources.ResourceLocation key = BuiltInRegistries.BLOCK.getKey(block);
+ data = data == null ? key.toString() : key + data;
+ }
+ }
+
+ CraftBlockData cached = stringDataCache.computeIfAbsent(data, s -> createNewData(null, s));
+ return (CraftBlockData) cached.clone();
+ }
+
+ private static CraftBlockData createNewData(Material material, String data) {
+ // Paper end - cache block data strings
net.minecraft.world.level.block.state.BlockState blockData;
Block block = CraftBlockType.bukkitToMinecraft(material);
Map<Property<?>, Comparable<?>> parsed = null;