src/main/java/us/myles/ViaVersion/slot/ItemSlotRewriter.java - minecraft/viaversion - Rivoreo Source Code Repositories

 package us.myles.ViaVersion.slot;

 import io.netty.buffer.ByteBuf;
 import org.bukkit.Material;
 import org.spacehq.opennbt.tag.builtin.CompoundTag;
 import org.spacehq.opennbt.tag.builtin.StringTag;
 import us.myles.ViaVersion.CancelException;
 import us.myles.ViaVersion.util.PacketUtil;

 import java.io.IOException;
 import java.util.HashMap;
 import java.util.Map;

 public class ItemSlotRewriter {

     public static void rewrite1_9To1_8(ByteBuf input, ByteBuf output) throws CancelException {
         try {
             ItemStack item = readItemStack(input);
             fixIdsFrom1_9To1_8(item);
             writeItemStack(item, output);
         } catch (Exception e) {
             System.out.println("Error while rewriting an item slot.");
             e.printStackTrace();
             throw new CancelException();
         }
     }

     public static void rewrite1_8To1_9(ByteBuf input, ByteBuf output) throws CancelException {
         try {
             ItemStack item = readItemStack(input);
             fixIdsFrom1_8To1_9(item);
             writeItemStack(item, output);
         } catch (Exception e) {
             System.out.println("Error while rewriting an item slot.");
             e.printStackTrace();
             throw new CancelException();
         }
     }

     public static void fixIdsFrom1_9To1_8(ItemStack item) {
         if (item != null) {
             if (item.id == Material.MONSTER_EGG.getId() && item.data == 0) {
                 CompoundTag tag = item.tag;
                 int data = 0;
                 if (tag != null && tag.get("EntityTag") instanceof CompoundTag) {
                     CompoundTag entityTag = tag.get("EntityTag");
                     if (entityTag.get("id") instanceof StringTag) {
                         StringTag id = entityTag.get("id");
                         if (ENTTIY_NAME_TO_ID.containsKey(id.getValue()))
                             data = ENTTIY_NAME_TO_ID.get(id.getValue());
                     }
                 }
                 item.tag = null;
                 item.data = (short) data;
             }
             if (item.id == Material.POTION.getId()) {
                 CompoundTag tag = item.tag;
                 int data = 0;
                 if (tag != null && tag.get("Potion") instanceof StringTag) {
                     StringTag potion = tag.get("Potion");
                     String potionName = potion.getValue().replace("minecraft:", "");
                     if (POTION_NAME_TO_ID.containsKey(potionName)) {
                         data = POTION_NAME_TO_ID.get(potionName);
                     }
                 }
                 item.tag = null;
                 item.data = (short) data;
             }
             if (item.id == 438) {
                 CompoundTag tag = item.tag;
                 int data = 0;
                 item.id = (short) Material.POTION.getId();
                 if (tag != null && tag.get("Potion") instanceof StringTag) {
                     StringTag potion = tag.get("Potion");
                     String potionName = potion.getValue().replace("minecraft:", "");
                     if (POTION_NAME_TO_ID.containsKey(potionName)) {
                         data = POTION_NAME_TO_ID.get(potionName) + 8192;
                     }
                 }
                 item.tag = null;
                 item.data = (short) data;
             }
         }
     }

     public static void fixIdsFrom1_8To1_9(ItemStack item) {
         if (item != null) {
             if (item.id == Material.MONSTER_EGG.getId() && item.data != 0) {
                 CompoundTag tag = item.tag;
                 if (tag == null) {
                     tag = new CompoundTag("tag");
                 }
                 CompoundTag entityTag = new CompoundTag("EntityTag");
                 if (ENTTIY_ID_TO_NAME.containsKey(Integer.valueOf(item.data))) {
                     StringTag id = new StringTag("id", ENTTIY_ID_TO_NAME.get(Integer.valueOf(item.data)));
                     entityTag.put(id);
                     tag.put(entityTag);
                 }
                 item.tag = tag;
                 item.data = 0;
             }
             if (item.id == Material.POTION.getId()) {
                 CompoundTag tag = item.tag;
                 if (tag == null) {
                     tag = new CompoundTag("tag");
                 }
                 if(item.data >= 16384){
                     item.id = 438; // splash id
                     item.data = (short) (item.data - 8192);
                 }
                 if (POTION_ID_TO_NAME.containsKey(Integer.valueOf(item.data))) {
                     String name = POTION_ID_TO_NAME.get(Integer.valueOf(item.data));
                     StringTag potion = new StringTag("Potion", "minecraft:" + name);
                     tag.put(potion);
                 }
                 item.tag = tag;
                 item.data = 0;
             }
         }
     }

     public static ItemStack readItemStack(ByteBuf input) throws IOException {
         short id = input.readShort();
         if (id < 0) {

             return null;
         } else {
             ItemStack item = new ItemStack();
             item.id = id;
             item.amount = input.readByte();
             item.data = input.readShort();
             item.tag = PacketUtil.readNBT(input);
             return item;
         }
     }

     public static void writeItemStack(ItemStack item, ByteBuf output) throws IOException {
         if (item == null) {
             output.writeShort(-1);
         } else {
             output.writeShort(item.id);
             output.writeByte(item.amount);
             output.writeShort(item.data);
             PacketUtil.writeNBT(output, item.tag);
         }
     }

     public static class ItemStack {

         public short id;
         public byte amount;
         public short data;
         public CompoundTag tag;

         public static ItemStack fromBukkit(org.bukkit.inventory.ItemStack stack) {
             ItemStack item = new ItemStack();
             item.id = (short) stack.getTypeId();
             item.amount = (byte) stack.getAmount();
             item.data = stack.getData().getData();
             // TODO: nbt
             return item;
         }
     }

     private static Map<String, Integer> ENTTIY_NAME_TO_ID = new HashMap<>();
     private static Map<Integer, String> ENTTIY_ID_TO_NAME = new HashMap<>();

     private static Map<String, Integer> POTION_NAME_TO_ID = new HashMap<>();
     private static Map<Integer, String> POTION_ID_TO_NAME = new HashMap<>();

     static {
         /* Entities */
         registerEntity(1, "Item");
         registerEntity(2, "XPOrb");
         registerEntity(7, "ThrownEgg");
         registerEntity(8, "LeashKnot");
         registerEntity(9, "Painting");
         registerEntity(10, "Arrow");
         registerEntity(11, "Snowball");
         registerEntity(12, "Fireball");
         registerEntity(13, "SmallFireball");
         registerEntity(14, "ThrownEnderpearl");
         registerEntity(15, "EyeOfEnderSignal");
         registerEntity(16, "ThrownPotion");
         registerEntity(17, "ThrownExpBottle");
         registerEntity(18, "ItemFrame");
         registerEntity(19, "WitherSkull");
         registerEntity(20, "PrimedTnt");
         registerEntity(21, "FallingSand");
         registerEntity(22, "FireworksRocketEntity");
         registerEntity(30, "ArmorStand");
         registerEntity(40, "MinecartCommandBlock");
         registerEntity(41, "Boat");
         registerEntity(42, "MinecartRideable");
         registerEntity(43, "MinecartChest");
         registerEntity(44, "MinecartFurnace");
         registerEntity(45, "MinecartTNT");
         registerEntity(46, "MinecartHopper");
         registerEntity(47, "MinecartSpawner");
         registerEntity(48, "Mob");
         registerEntity(49, "Monster");
         registerEntity(50, "Creeper");
         registerEntity(51, "Skeleton");
         registerEntity(52, "Spider");
         registerEntity(53, "Giant");
         registerEntity(54, "Zombie");
         registerEntity(55, "Slime");
         registerEntity(56, "Ghast");
         registerEntity(57, "PigZombie");
         registerEntity(58, "Enderman");
         registerEntity(59, "CaveSpider");
         registerEntity(60, "Silverfish");
         registerEntity(61, "Blaze");
         registerEntity(62, "LavaSlime");
         registerEntity(63, "EnderDragon");
         registerEntity(64, "WitherBoss");
         registerEntity(65, "Bat");
         registerEntity(66, "Witch");
         registerEntity(67, "Endermite");
         registerEntity(68, "Guardian");
         registerEntity(90, "Pig");
         registerEntity(91, "Sheep");
         registerEntity(92, "Cow");
         registerEntity(93, "Chicken");
         registerEntity(94, "Squid");
         registerEntity(95, "Wolf");
         registerEntity(96, "MushroomCow");
         registerEntity(97, "SnowMan");
         registerEntity(98, "Ozelot");
         registerEntity(99, "VillagerGolem");
         registerEntity(100, "EntityHorse");
         registerEntity(101, "Rabbit");
         registerEntity(120, "Villager");
         registerEntity(200, "EnderCrystal");

         /* Potions */
         registerPotion(0, "water");
         registerPotion(64, "mundane");
         registerPotion(32, "thick");
         registerPotion(16, "awkward");

         registerPotion(8198, "night_vision");
         registerPotion(8262, "long_night_vision");

         registerPotion(8206, "invisibility");
         registerPotion(8270, "long_invisibility");

         registerPotion(8203, "leaping");
         registerPotion(8267, "long_leaping");
         registerPotion(8235, "strong_leaping");

         registerPotion(8195, "fire_resistance");
         registerPotion(8259, "long_fire_resistance");

         registerPotion(8194, "swiftness");
         registerPotion(8258, "long_swiftness");
         registerPotion(8226, "strong_swiftness");

         registerPotion(8202, "slowness");
         registerPotion(8266, "long_slowness");

         registerPotion(8205, "water_breathing");
         registerPotion(8269, "long_water_breathing");

         registerPotion(8197, "healing");
         registerPotion(8229, "strong_healing");

         registerPotion(8204, "harming");
         registerPotion(8236, "strong_harming");

         registerPotion(8196, "poison");
         registerPotion(8260, "long_poison");
         registerPotion(8228, "strong_poison");

         registerPotion(8193, "regeneration");
         registerPotion(8257, "long_regeneration");
         registerPotion(8225, "strong_regeneration");

         registerPotion(8201, "strength");
         registerPotion(8265, "long_strength");
         registerPotion(8233, "strong_strength");

         registerPotion(8200, "weakness");
         registerPotion(8264, "long_weakness");

     }

     private static void registerEntity(Integer id, String name) {
         ENTTIY_ID_TO_NAME.put(id, name);
         ENTTIY_NAME_TO_ID.put(name, id);
     }

     private static void registerPotion(Integer id, String name) {
         POTION_ID_TO_NAME.put(id, name);
         POTION_NAME_TO_ID.put(name, id);
     }
 }
	package us.myles.ViaVersion.slot;

	import io.netty.buffer.ByteBuf;
	import org.bukkit.Material;
	import org.spacehq.opennbt.tag.builtin.CompoundTag;
	import org.spacehq.opennbt.tag.builtin.StringTag;
	import us.myles.ViaVersion.CancelException;
	import us.myles.ViaVersion.util.PacketUtil;

	import java.io.IOException;
	import java.util.HashMap;
	import java.util.Map;

	public class ItemSlotRewriter {

	public static void rewrite1_9To1_8(ByteBuf input, ByteBuf output) throws CancelException {
	try {
	ItemStack item = readItemStack(input);
	fixIdsFrom1_9To1_8(item);
	writeItemStack(item, output);
	} catch (Exception e) {
	System.out.println("Error while rewriting an item slot.");
	e.printStackTrace();
	throw new CancelException();
	}
	}

	public static void rewrite1_8To1_9(ByteBuf input, ByteBuf output) throws CancelException {
	try {
	ItemStack item = readItemStack(input);
	fixIdsFrom1_8To1_9(item);
	writeItemStack(item, output);
	} catch (Exception e) {
	System.out.println("Error while rewriting an item slot.");
	e.printStackTrace();
	throw new CancelException();
	}
	}

	public static void fixIdsFrom1_9To1_8(ItemStack item) {
	if (item != null) {
	if (item.id == Material.MONSTER_EGG.getId() && item.data == 0) {
	CompoundTag tag = item.tag;
	int data = 0;
	if (tag != null && tag.get("EntityTag") instanceof CompoundTag) {
	CompoundTag entityTag = tag.get("EntityTag");
	if (entityTag.get("id") instanceof StringTag) {
	StringTag id = entityTag.get("id");
	if (ENTTIY_NAME_TO_ID.containsKey(id.getValue()))
	data = ENTTIY_NAME_TO_ID.get(id.getValue());
	}
	}
	item.tag = null;
	item.data = (short) data;
	}
	if (item.id == Material.POTION.getId()) {
	CompoundTag tag = item.tag;
	int data = 0;
	if (tag != null && tag.get("Potion") instanceof StringTag) {
	StringTag potion = tag.get("Potion");
	String potionName = potion.getValue().replace("minecraft:", "");
	if (POTION_NAME_TO_ID.containsKey(potionName)) {
	data = POTION_NAME_TO_ID.get(potionName);
	}
	}
	item.tag = null;
	item.data = (short) data;
	}
	if (item.id == 438) {
	CompoundTag tag = item.tag;
	int data = 0;
	item.id = (short) Material.POTION.getId();
	if (tag != null && tag.get("Potion") instanceof StringTag) {
	StringTag potion = tag.get("Potion");
	String potionName = potion.getValue().replace("minecraft:", "");
	if (POTION_NAME_TO_ID.containsKey(potionName)) {
	data = POTION_NAME_TO_ID.get(potionName) + 8192;
	}
	}
	item.tag = null;
	item.data = (short) data;
	}
	}
	}

	public static void fixIdsFrom1_8To1_9(ItemStack item) {
	if (item != null) {
	if (item.id == Material.MONSTER_EGG.getId() && item.data != 0) {
	CompoundTag tag = item.tag;
	if (tag == null) {
	tag = new CompoundTag("tag");
	}
	CompoundTag entityTag = new CompoundTag("EntityTag");
	if (ENTTIY_ID_TO_NAME.containsKey(Integer.valueOf(item.data))) {
	StringTag id = new StringTag("id", ENTTIY_ID_TO_NAME.get(Integer.valueOf(item.data)));
	entityTag.put(id);
	tag.put(entityTag);
	}
	item.tag = tag;
	item.data = 0;
	}
	if (item.id == Material.POTION.getId()) {
	CompoundTag tag = item.tag;
	if (tag == null) {
	tag = new CompoundTag("tag");
	}
	if(item.data >= 16384){
	item.id = 438; // splash id
	item.data = (short) (item.data - 8192);
	}
	if (POTION_ID_TO_NAME.containsKey(Integer.valueOf(item.data))) {
	String name = POTION_ID_TO_NAME.get(Integer.valueOf(item.data));
	StringTag potion = new StringTag("Potion", "minecraft:" + name);
	tag.put(potion);
	}
	item.tag = tag;
	item.data = 0;
	}
	}
	}

	public static ItemStack readItemStack(ByteBuf input) throws IOException {
	short id = input.readShort();
	if (id < 0) {

	return null;
	} else {
	ItemStack item = new ItemStack();
	item.id = id;
	item.amount = input.readByte();
	item.data = input.readShort();
	item.tag = PacketUtil.readNBT(input);
	return item;
	}
	}

	public static void writeItemStack(ItemStack item, ByteBuf output) throws IOException {
	if (item == null) {
	output.writeShort(-1);
	} else {
	output.writeShort(item.id);
	output.writeByte(item.amount);
	output.writeShort(item.data);
	PacketUtil.writeNBT(output, item.tag);
	}
	}

	public static class ItemStack {

	public short id;
	public byte amount;
	public short data;
	public CompoundTag tag;

	public static ItemStack fromBukkit(org.bukkit.inventory.ItemStack stack) {
	ItemStack item = new ItemStack();
	item.id = (short) stack.getTypeId();
	item.amount = (byte) stack.getAmount();
	item.data = stack.getData().getData();
	// TODO: nbt
	return item;
	}
	}

	private static Map<String, Integer> ENTTIY_NAME_TO_ID = new HashMap<>();
	private static Map<Integer, String> ENTTIY_ID_TO_NAME = new HashMap<>();

	private static Map<String, Integer> POTION_NAME_TO_ID = new HashMap<>();
	private static Map<Integer, String> POTION_ID_TO_NAME = new HashMap<>();

	static {
	/* Entities */
	registerEntity(1, "Item");
	registerEntity(2, "XPOrb");
	registerEntity(7, "ThrownEgg");
	registerEntity(8, "LeashKnot");
	registerEntity(9, "Painting");
	registerEntity(10, "Arrow");
	registerEntity(11, "Snowball");
	registerEntity(12, "Fireball");
	registerEntity(13, "SmallFireball");
	registerEntity(14, "ThrownEnderpearl");
	registerEntity(15, "EyeOfEnderSignal");
	registerEntity(16, "ThrownPotion");
	registerEntity(17, "ThrownExpBottle");
	registerEntity(18, "ItemFrame");
	registerEntity(19, "WitherSkull");
	registerEntity(20, "PrimedTnt");
	registerEntity(21, "FallingSand");
	registerEntity(22, "FireworksRocketEntity");
	registerEntity(30, "ArmorStand");
	registerEntity(40, "MinecartCommandBlock");
	registerEntity(41, "Boat");
	registerEntity(42, "MinecartRideable");
	registerEntity(43, "MinecartChest");
	registerEntity(44, "MinecartFurnace");
	registerEntity(45, "MinecartTNT");
	registerEntity(46, "MinecartHopper");
	registerEntity(47, "MinecartSpawner");
	registerEntity(48, "Mob");
	registerEntity(49, "Monster");
	registerEntity(50, "Creeper");
	registerEntity(51, "Skeleton");
	registerEntity(52, "Spider");
	registerEntity(53, "Giant");
	registerEntity(54, "Zombie");
	registerEntity(55, "Slime");
	registerEntity(56, "Ghast");
	registerEntity(57, "PigZombie");
	registerEntity(58, "Enderman");
	registerEntity(59, "CaveSpider");
	registerEntity(60, "Silverfish");
	registerEntity(61, "Blaze");
	registerEntity(62, "LavaSlime");
	registerEntity(63, "EnderDragon");
	registerEntity(64, "WitherBoss");
	registerEntity(65, "Bat");
	registerEntity(66, "Witch");
	registerEntity(67, "Endermite");
	registerEntity(68, "Guardian");
	registerEntity(90, "Pig");
	registerEntity(91, "Sheep");
	registerEntity(92, "Cow");
	registerEntity(93, "Chicken");
	registerEntity(94, "Squid");
	registerEntity(95, "Wolf");
	registerEntity(96, "MushroomCow");
	registerEntity(97, "SnowMan");
	registerEntity(98, "Ozelot");
	registerEntity(99, "VillagerGolem");
	registerEntity(100, "EntityHorse");
	registerEntity(101, "Rabbit");
	registerEntity(120, "Villager");
	registerEntity(200, "EnderCrystal");

	/* Potions */
	registerPotion(0, "water");
	registerPotion(64, "mundane");
	registerPotion(32, "thick");
	registerPotion(16, "awkward");

	registerPotion(8198, "night_vision");
	registerPotion(8262, "long_night_vision");

	registerPotion(8206, "invisibility");
	registerPotion(8270, "long_invisibility");

	registerPotion(8203, "leaping");
	registerPotion(8267, "long_leaping");
	registerPotion(8235, "strong_leaping");

	registerPotion(8195, "fire_resistance");
	registerPotion(8259, "long_fire_resistance");

	registerPotion(8194, "swiftness");
	registerPotion(8258, "long_swiftness");
	registerPotion(8226, "strong_swiftness");

	registerPotion(8202, "slowness");
	registerPotion(8266, "long_slowness");

	registerPotion(8205, "water_breathing");
	registerPotion(8269, "long_water_breathing");

	registerPotion(8197, "healing");
	registerPotion(8229, "strong_healing");

	registerPotion(8204, "harming");
	registerPotion(8236, "strong_harming");

	registerPotion(8196, "poison");
	registerPotion(8260, "long_poison");
	registerPotion(8228, "strong_poison");

	registerPotion(8193, "regeneration");
	registerPotion(8257, "long_regeneration");
	registerPotion(8225, "strong_regeneration");

	registerPotion(8201, "strength");
	registerPotion(8265, "long_strength");
	registerPotion(8233, "strong_strength");

	registerPotion(8200, "weakness");
	registerPotion(8264, "long_weakness");

	}

	private static void registerEntity(Integer id, String name) {
	ENTTIY_ID_TO_NAME.put(id, name);
	ENTTIY_NAME_TO_ID.put(name, id);
	}

	private static void registerPotion(Integer id, String name) {
	POTION_ID_TO_NAME.put(id, name);
	POTION_NAME_TO_ID.put(name, id);
	}
	}