RFID Reader through Ethernet Shield Idea?

Straight to the point what i would like and if this is possible. Spent hours researching and cant figure out still.

1 X ADK Mega Arduino
1 X Arduino Ethernet Shield
1 x Speedway Revolution RFID reader

Program an App to run on an Android based Tablet and control the RFID reader through the Arduino Ethernet TCP Connection.

Now i have access to the C++ and Java Source code of my reader to control the reader through a TCP connection, the code is much too large to run on the Arduino Apprx 700kb.

1: Attempt to modify c++ header files to suit Arduino and my needs

2: Can you create a direct connection to the phones App through USB -> Ethernet and run Java Source code.

Any insight would be helpful
Regards Blaine