Compress 压缩数据.

Marshal generate Packet with the ID and Fields.

ReadNBytes read N bytes from bytes.Reader.

RecvPacket receive a packet from server.

UnCompress 读取一个压缩的包.

Packet define a net data package.

DecodeReader is both io.Reader and io.ByteReader.

A Field is both FieldEncoder and FieldDecoder.

A FieldDecoder can Decode from minecraft protocol.

A FieldEncoder can be encode as minecraft protocol used.