Forge getSpawnPacket function

    public static Packet getEntitySpawnPacket(Entity entity)
    {
        EntityTrackerInfo info = MinecraftForge.getEntityTrackerInfo(entity, false);
        if (info == null)
        {
            return null;
        }
        ByteArrayOutputStream bytes = new ByteArrayOutputStream();
        DataOutputStream data = new DataOutputStream(bytes);
        try {
            data.writeInt(FORGE_PACKET_SPAWN);
            data.writeInt(info.Mod.toString().hashCode());
            data.writeInt(info.ID);
            if (entity instanceof IOwnableEntity)
            {
                Entity owner = ((IOwnableEntity)entity).getOwner();
                data.writeInt(owner == null ? 0 : owner.entityId);
            }
            if (entity instanceof ISpawnHandler)
            {
                ((ISpawnHandler)entity).writeSpawnData(data);
            }
            data.flush();
        }
        catch (IOException e)
        {
            e.printStackTrace();
        }

        Packet250CustomPayload pkt = new Packet250CustomPayload();
        pkt.channel = "Forge";
        pkt.data = bytes.toByteArray();
        pkt.length = pkt.data.length;
        return pkt;
    }