Fix USE_ITEM using correct item. Fix SPAWN_OBJECT velocity.

src/main/java/us/myles/ViaVersion/transformers/IncomingTransformer.java

@@ -2,7 +2,10 @@ package us.myles.ViaVersion.transformers;
 
 import io.netty.buffer.ByteBuf;
 import io.netty.channel.Channel;
+
+import org.bukkit.Material;
 import org.bukkit.inventory.ItemStack;
+
 import us.myles.ViaVersion.*;
 import us.myles.ViaVersion.handlers.ViaVersionInitializer;
 import us.myles.ViaVersion.packets.PacketType;
@@ -89,11 +92,8 @@ public class IncomingTransformer {
                 throw new CancelException();
             }
             output.writeByte(status);
-            // read position
+            // write remaining bytes
-            Long pos = input.readLong();
+            output.writeBytes(input);
-            output.writeLong(pos);
-            short face = input.readUnsignedByte();
-            output.writeByte(face);
             return;
         }
         if (packet == PacketType.PLAY_CLICK_WINDOW) {
@@ -208,9 +208,23 @@ public class IncomingTransformer {
 	        PacketUtil.writeVarInt(PacketType.PLAY_PLAYER_BLOCK_PLACEMENT.getPacketID(), output);
 	        // Simulate using item :)
 	        output.writeLong(-1L);
-            output.writeByte(-1);
+	        output.writeByte(255);
 	        // write item in hand
-            output.writeShort(-1);
+	        ItemStack inHand = Core.getHandItem(info);
+            Object item = null;
+            try {
+                Method m = ReflectionUtil.obc("inventory.CraftItemStack").getDeclaredMethod("asNMSCopy", ItemStack.class);
+                item = m.invoke(null, inHand);
+            } catch (NoSuchMethodException e) {
+                e.printStackTrace();
+            } catch (ClassNotFoundException e) {
+                e.printStackTrace();
+            } catch (InvocationTargetException e) {
+                e.printStackTrace();
+            } catch (IllegalAccessException e) {
+                e.printStackTrace();
+            }
+            PacketUtil.writeItem(item, output);
 	
 	        output.writeByte(-1);
 	        output.writeByte(-1);

src/main/java/us/myles/ViaVersion/transformers/OutgoingTransformer.java

@@ -238,11 +238,15 @@ public class OutgoingTransformer {
             int data = input.readInt();
             output.writeInt(data);
             
-            short vX = input.readableBytes() >= 16 ? input.readShort() : 0;
+            short vX = 0, vY = 0, vZ = 0;
+            if(data > 0)
+            {
+            	vX = input.readShort();
+            	vY = input.readShort();
+            	vZ = input.readShort();
+            }
             output.writeShort(vX);
-            short vY = input.readableBytes() >= 16 ? input.readShort() : 0;
             output.writeShort(vY);
-            short vZ = input.readableBytes() >= 16 ? input.readShort() : 0;
             output.writeShort(vZ);
 
             return;