Dear All,
I've seen several drivers now for readers under OpenCard, which is certainly
to be welcomed. However, I've come across various behaviour from these when
a card returns SW1=0x6C (more data available, i.e. LE was incorrect). Some
terminals simply report this back so the CardService can reissue the
CommandAPDU with LE = SW2, whereas other terminals do this for you, so in
theory all your CommandAPDUs could have LE=0 but still work OK.
What is the correct behaviour for a CardTerminal under these circumstances ?
It's a bit confusing for CardService writers as for each call with a
CommandAPDU where the LE is unknown you have to do an if (SW1 == 0x90) etc.
regards,
Jon Barber.
Visit the OpenCard Framework's WWW site at http://www.opencard.org/ for
access to documentation, code, presentations, and OCF announcements.
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