diff options
| -rw-r--r-- | readers.py | 2 | ||||
| -rw-r--r-- | utils.py | 74 |
2 files changed, 74 insertions, 2 deletions
@@ -8,7 +8,7 @@ pycsc you'll need to downgrade to SVN revision 246. """ raise -import sys, utils, getopt +import sys, utils, getopt, binascii class Smartcard_Reader(object): def list_readers(cls): @@ -1,4 +1,4 @@ -import string, binascii, sys, re +import string, binascii, sys, re, inspect def represent_binary_fancy(len, value, mask = 0): result = [] @@ -454,7 +454,79 @@ class R_APDU(APDU): def render(self): "Return this APDU as a binary string" return self.data + self.sw + +class PN532_Frame(APDU): + """This is not really an ISO 7816 APDU, but close enough to use the same + class infrastructure.""" + + def __init__(self, *args, **kwargs): + """If applicable: redirect instance creation to a subclass""" + super(PN532_Frame, self).__init__(*args, **kwargs) + self._autosubclass() + + def _autosubclass(self): + """If a more appropriate subclass is known about, change __class__ to + point to that class.""" + + # Find all global classes that are a (possibly indirect) subclass of the current class + candidates = [ e for e in globals().values() + if inspect.isclass(e) and issubclass(e, self.__class__) + and not e == self.__class__ ] + + # For each candidate: Find if it specifies any matching rules + # through class variables called MATCH_BY_* where * may be any field + # and if so, remove those classes that don't match. Also count the number + # of matches, to determine the best match + matches = {} + for candidate in candidates: + m = 0 + for var in dir(candidate): + if var.startswith("MATCH_BY_"): + fieldname = var[len("MATCH_BY_"):] + if getattr(self, fieldname) == getattr(candidate, var): + m = m + 1 + else: + m = -1 + break + if m != -1: + matches[candidate] = m + + # Remove all candidates that don't have maximal score + max_score = max(matches.values()) + candidates = [ k for k,v in matches.items() if v == max_score ] + + # If there is still more than one candidate remaining, randomly choose + # the first one. + if len(candidates) > 0: + c = candidates[0] + if c != self.__class__: + self.__class__ = c + + DIR = _make_byte_property("DIR"); dir = DIR + CMD = _make_byte_property("CMD"); cmd = CMD + def parse(self, data): + self.dir = data[0] + self.cmd = data[1] + self.data = data[2:] + + def _format_fields(self): + fields = ["DIR", "CMD"] + return self._format_parts(fields) + + def render(self): + return chr(self.cmd) + chr(self.dir) + self.data + +class PN532_Command(PN532_Frame): + MATCH_BY_dir = 0xd4 + +class PN532_Response(PN532_Frame): + MATCH_BY_dir = 0xd5 + +class PN532_Response_InListPassiveTarget(PN532_Frame): + MATCH_BY_cmd = 0x4b + + if __name__ == "__main__": response = """ 0000: 07 A0 00 00 00 03 00 00 07 00 07 A0 00 00 00 62 ...............b |