Add methods to handle new tags format

common/src/main/java/us/myles/ViaVersion/api/rewriters/ItemRewriter.java

@@ -205,12 +205,12 @@ public class ItemRewriter {
                 map(Type.FLOAT); // 7 - Offset Z
                 map(Type.FLOAT); // 8 - Particle Data
                 map(Type.INT); // 9 - Particle Count
-                handler(getSpawnParticleHandler(itemType, coordType));
+                handler(getSpawnParticleHandler(itemType));
             }
         });
     }
 
-    public PacketHandler getSpawnParticleHandler(Type<Item> itemType, Type<?> coordType) {
+    public PacketHandler getSpawnParticleHandler(Type<Item> itemType) {
         return wrapper -> {
             int id = wrapper.get(Type.INT, 0);
             if (id == -1) return;

common/src/main/java/us/myles/ViaVersion/api/rewriters/TagRewriter.java

@@ -52,6 +52,8 @@ public class TagRewriter {
     }
 
     /**
+     * Pre 1.17 reading of hardcoded registry types.
+     *
      * @param packetType    packet type
      * @param readUntilType read and process the types until (including) the given registry type
      */
@@ -64,6 +66,20 @@ public class TagRewriter {
         });
     }
 
+    /**
+     * 1.17+ reading of generic tag types.
+     *
+     * @param packetType packet type
+     */
+    public void registerGeneric(ClientboundPacketType packetType) {
+        protocol.registerOutgoing(packetType, new PacketRemapper() {
+            @Override
+            public void registerMap() {
+                handler(getGenericHandler());
+            }
+        });
+    }
+
     public PacketHandler getHandler(@Nullable RegistryType readUntilType) {
         return wrapper -> {
             for (RegistryType type : RegistryType.getValues()) {
@@ -77,6 +93,25 @@ public class TagRewriter {
         };
     }
 
+    public PacketHandler getGenericHandler() {
+        return wrapper -> {
+            int length = wrapper.passthrough(Type.VAR_INT);
+            for (int i = 0; i < length; i++) {
+                String registryKey = wrapper.passthrough(Type.STRING);
+                if (registryKey.startsWith("minecraft:")) {
+                    registryKey = registryKey.substring(10);
+                }
+
+                RegistryType type = RegistryType.getByKey(registryKey);
+                if (type != null) {
+                    handle(wrapper, getRewriter(type), getNewTags(type));
+                } else {
+                    handle(wrapper, null, null);
+                }
+            }
+        };
+    }
+
     public void handle(PacketWrapper wrapper, @Nullable IdRewriteFunction rewriteFunction, List<TagData> newTags) throws Exception {
         int tagsSize = wrapper.read(Type.VAR_INT);
         wrapper.write(Type.VAR_INT, newTags != null ? tagsSize + newTags.size() : tagsSize); // add new tags count

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_17to1_16_4/packets/InventoryPackets.java

@@ -56,7 +56,7 @@ public class InventoryPackets {
                         wrapper.passthrough(Type.FLOAT); // Scale
                     }
                 });
-                handler(itemRewriter.getSpawnParticleHandler(Type.FLAT_VAR_INT_ITEM, Type.DOUBLE));
+                handler(itemRewriter.getSpawnParticleHandler(Type.FLAT_VAR_INT_ITEM));
             }
         });
     }