Dataflash Memory in ArduCopter 3.2

Hello evverybody,
I have got a problem. I am working with Pixhawk and I know the memory features of the autopilot are:

2MB of Flash
256 KB RAM

Anybody knows how much space required ArduCopter code in the Flash memory? or How much free space we have in Pixhawk autopilot?
I have been looking for any function or file in the code (ArduCopter) which shows that parameter. But I did’nt find any result.

Thank you in advance for your attention
Carlos.