need some help help help help help

Hi
I have a private runescape server (called Shangri La 2) 317 server and reverse engineered client. Client code is really insane I cant understand it; I decided to write my own client and possibly a bot to auto-play my server for fun. Im facing problems in interpreting packets being exchanged b/w server and clients. No idea of packet protocol or semantics of buffer. Can you please help me to understand/interpret server code to write my own client? Any document/reference/link/forum?

client and server from:
http://www.fileden.com/files/2009/8/30/2559711/Shangri-La Client V2.rar
http://www.fileden.com/files/2009/8/30/2559711/Shangri-La v2.rar

Regards,
Sajid