From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Telesphoreo <me@telesphoreo.me>
Date: Fri, 22 Apr 2022 01:56:03 -0500
Subject: [PATCH] Reset large tags


diff --git a/src/main/java/com/github/atlasmediagroup/scissors/NbtUtility.java b/src/main/java/com/github/atlasmediagroup/scissors/NbtUtility.java
new file mode 100644
index 0000000000000000000000000000000000000000..058203440fd071ce5edbe18391ea60f0a5fbee3a
--- /dev/null
+++ b/src/main/java/com/github/atlasmediagroup/scissors/NbtUtility.java
@@ -0,0 +1,28 @@
+package com.github.atlasmediagroup.scissors;
+
+import net.minecraft.nbt.CompoundTag;
+
+import javax.annotation.Nullable;
+import java.nio.charset.StandardCharsets;
+
+public class NbtUtility
+{
+
+    public static boolean isTooLarge(@Nullable CompoundTag tag)
+    {
+        if (tag == null) return false;
+        return tag.toString().getBytes(StandardCharsets.UTF_8).length > (256 * 1024);
+    }
+
+    public static class Item
+    {
+
+        public static CompoundTag removeItemData(CompoundTag tag)
+        {
+            CompoundTag cleaned = new CompoundTag();
+            cleaned.putString("id", tag.getString("id"));
+            cleaned.putByte("Count", tag.getByte("Count"));
+            return cleaned;
+        }
+    }
+}
diff --git a/src/main/java/net/minecraft/world/item/ItemStack.java b/src/main/java/net/minecraft/world/item/ItemStack.java
index 6837c965592d4584cfc958a1008b98791a0fc780..0f7d7248be0aa99dd759d12ed956a98822a2749b 100644
--- a/src/main/java/net/minecraft/world/item/ItemStack.java
+++ b/src/main/java/net/minecraft/world/item/ItemStack.java
@@ -1,5 +1,6 @@
 package net.minecraft.world.item;
 
+import com.github.atlasmediagroup.scissors.NbtUtility;
 import com.google.common.collect.HashMultimap;
 import com.google.common.collect.Lists;
 import com.google.common.collect.Multimap;
@@ -8,13 +9,13 @@ import com.mojang.brigadier.StringReader;
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
 import com.mojang.logging.LogUtils;
 import com.mojang.serialization.Codec;
+import com.mojang.serialization.Dynamic;
 import com.mojang.serialization.codecs.RecordCodecBuilder;
 import java.text.DecimalFormat;
 import java.text.DecimalFormatSymbols;
 import java.util.Collection;
 import java.util.Iterator;
 import java.util.List;
-import java.util.Collections;
 import java.util.Comparator;
 import java.util.Locale;
 import java.util.Map.Entry;
@@ -50,11 +51,7 @@ import net.minecraft.util.datafix.fixes.References;
 import net.minecraft.world.InteractionHand;
 import net.minecraft.world.InteractionResult;
 import net.minecraft.world.InteractionResultHolder;
-import net.minecraft.world.entity.Entity;
-import net.minecraft.world.entity.EquipmentSlot;
-import net.minecraft.world.entity.LivingEntity;
-import net.minecraft.world.entity.MobType;
-import net.minecraft.world.entity.SlotAccess;
+import net.minecraft.world.entity.*;
 import net.minecraft.world.entity.ai.attributes.Attribute;
 import net.minecraft.world.entity.ai.attributes.AttributeModifier;
 import net.minecraft.world.entity.ai.attributes.Attributes;
@@ -75,8 +72,6 @@ import net.minecraft.world.level.block.Block;
 import org.slf4j.Logger;
 
 // CraftBukkit start
-import com.mojang.serialization.Dynamic;
-import java.util.List;
 import java.util.Map;
 import java.util.Objects;
 import net.minecraft.server.MinecraftServer;
@@ -251,6 +246,13 @@ public final class ItemStack {
 
     // CraftBukkit - break into own method
     private void load(CompoundTag nbttagcompound) {
+        // Scissors start - Reset large tags
+        if (NbtUtility.isTooLarge(nbttagcompound)) {
+            // Reset tag without destroying item
+            nbttagcompound = NbtUtility.Item.removeItemData(nbttagcompound);
+        }
+        // Scissors end
+
         this.item = (Item) Registry.ITEM.get(new ResourceLocation(nbttagcompound.getString("id")));
         this.count = nbttagcompound.getByte("Count");
         if (nbttagcompound.contains("tag", 10)) {
@@ -495,7 +497,11 @@ public final class ItemStack {
         nbt.putString("id", minecraftkey == null ? "minecraft:air" : minecraftkey.toString());
         nbt.putByte("Count", (byte) this.count);
         if (this.tag != null) {
-            nbt.put("tag", this.tag.copy());
+            // Scissors start - Don't save large tags
+            if (!NbtUtility.isTooLarge(this.tag)) {
+                nbt.put("tag", this.tag.copy());
+            }
+            // Scissors end
         }
 
         return nbt;
@@ -827,6 +833,9 @@ public final class ItemStack {
     // Paper end
 
     public void setTag(@Nullable CompoundTag nbt) {
+        // Scissors start - Ignore large tags
+        if (NbtUtility.isTooLarge(nbt)) return;
+        // Scissors end
         this.tag = nbt;
         this.processEnchantOrder(this.tag); // Paper
         if (this.getItem().canBeDepleted()) {
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
index 226d9ac01c601fc8954a88bea93a521cdce79eda..9bfa2deca1258dd9c294422a0ea032142cd11789 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemStack.java
@@ -1,16 +1,12 @@
 package org.bukkit.craftbukkit.inventory;
 
-import static org.bukkit.craftbukkit.inventory.CraftMetaItem.*;
 import com.google.common.collect.ImmutableMap;
-import java.util.Map;
 import net.minecraft.nbt.CompoundTag;
 import net.minecraft.nbt.ListTag;
 import net.minecraft.world.item.Item;
 import org.apache.commons.lang.Validate;
 import org.bukkit.Material;
-import org.bukkit.NamespacedKey;
 import org.bukkit.configuration.serialization.DelegateDeserialization;
-import org.bukkit.craftbukkit.enchantments.CraftEnchantment;
 import org.bukkit.craftbukkit.util.CraftLegacy;
 import org.bukkit.craftbukkit.util.CraftMagicNumbers;
 import org.bukkit.craftbukkit.util.CraftNamespacedKey;
@@ -19,6 +15,11 @@ import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
 import org.bukkit.material.MaterialData;
 
+import java.util.Map;
+
+import static org.bukkit.craftbukkit.inventory.CraftMetaItem.ENCHANTMENTS_ID;
+import static org.bukkit.craftbukkit.inventory.CraftMetaItem.ENCHANTMENTS_LVL;
+
 @DelegateDeserialization(ItemStack.class)
 public final class CraftItemStack extends ItemStack {