MessageEncoder

A boolean indicating whether this packet has a fully encrypted payload.

The protocol type of this message, providing us with the expected size of the message.

Encodes the message into the buffer where the buffer is the out property in Netty. Rather than allocating new byte buf instances, we can directly encode to the out property with most packets. This does not however hold true with pre-computed ones, such as player info, where we must instead write the pre-computed bytes over to out first.