PC/SC support about libfreefare HOT 7 OPEN

Hi Henryk. It's indeed a good idea but we don't have the resources to do it at 
the moment. Feel free to provide some patches if you have the opportunity.
If supporting DESFire through PC/SC is indeed pretty easy, I would be much more 
cautious about handling storage cards by part 3 section 3.2.2.1.
Support is optional and would have to be tested against the reader someone 
tries to use, and even so I'm not sure you could handle e.g. MF ULC cards.
More promising is the new part 3 sup 2 to transparently communicating with 
contactless cards. But as of today, almost no reader implement it yet.

Hello out there,
we are a 3 man group from university Erlangen and currently working for our 
practicum on this issue. All in all we are trying to keep the interface of 
libfreefare as much as possible to status quo, so that your process of 
readjustment comes nearly to zero. Three functions for easy initialisation, 
termination and listing devices with pcsc-lite were added and 
freefare_get_tags, freefare_tag_new got some alternative function for pcsc_data 
structures. freefare-functions communicating with an RFID device got branches 
and execute the nfc/pcsc-variant depending on what library you initialized.

We got our first great results with the project, like reading the UID and 
getting some information about the tag. But we could need some help for testing 
some tags and more functionalities we implemeneted. 
Currently you can find the project on github, its named "libfreefare-pcsc", but 
its not yet recommended for stable use. We are happy for every hint supporting 
the progress of the project, maybe we can send in foreseeable time a big patch 
to the libfreefare team.

Great initiative!
Technically it would have been easier for you to fork the git repo rather than 
creating one from scratch. I'll contact you by email and see what we can do to 
prepare a future merge.

patches have now been cherry-picked in a separate branch "pcsc"

For info, Simon's Github fork is now rebased on our original git repo and is 
available here:
https://github.com/simonibus/libfreefare-pcsc/tree/pcsc

I just pushed 2 changes related to PCSC on GNU/Linux.

I also tried to compile on Mac OS X but I need to make more modification to the 
code and the Mac OS X pcsclite do not support SCARD_AUTOALLOCATE. So more work 
is needed.

Any progress on this topic?

Was there any reason why PC/SC has not been integrated into libnfc directly? 
``nfc_register_driver`` explicitly allows loading a third party reader driver.