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authorHenryk Plötz <henryk@ploetzli.ch>2010-03-03 00:58:30 +0100
committerHenryk Plötz <henryk@ploetzli.ch>2010-03-03 00:58:30 +0100
commitb27a1e034fd6124307ae69df31dfb8d96647ec27 (patch)
tree2c844ab5526250f87ea288c94d3e012e689e4729
parentbc07262d8043a189dd8f19df904c233b1358c230 (diff)
Add class infrastructure for PN532 commands
-rw-r--r--readers.py2
-rw-r--r--utils.py74
2 files changed, 74 insertions, 2 deletions
diff --git a/readers.py b/readers.py
index cefaf3c..af95990 100644
--- a/readers.py
+++ b/readers.py
@@ -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):
diff --git a/utils.py b/utils.py
index 57883a2..b973e44 100644
--- a/utils.py
+++ b/utils.py
@@ -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