question about dio_get_uint32

hi,
  although I've noticed that this emailing list has had very little 
activitiy lately other than junk mails, hopefully someone will pick up this 
message.
  I am builiding a java client for freeciv 1.14.0  (I gave up on trying to 
keeping up to date with the latest development and went for a stable 
version)  My question is about ./common/dataio.dio_get_uint32.  Does freeciv 
actually use unsigned 4 byte ints?  More broadly, is it safe to assume that 
I can use java int (signed, 4 bytes) to read in all the ints from all types 
of packets?

thanks for any help,
David Chen
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