Where is xfer actually used?

[David Nadlinger]

Hello all,

In the C++ implementation, pretty much all of the protocol read/write 
methods accumulate the length of the transmitted/received data and 
return it to the caller.

But from a quick glance over the sources, I couldn't find out where this 
data is actually used, and e.g. the Java implementation doesn't have it 
in the first place. Could someone give me a hint please?

David