pySim-shell: export command: guess number of records when not specified

The select response of an UICC will always return the number of records
of a file. However, older SIM will not include the number of records in
the select response. In those cases, simply guess the number of records
by reading until the first invalid record is hit.

Change-Id: Ib480797d881b9ec607ec6a86b73d452449f8cf87
Related: OS#5274

pySim-shell.py

@@ -517,10 +517,28 @@ class PySimCommands(CommandSet):
 				result = self._cmd.rs.read_binary()
 				self._cmd.poutput("update_binary " + str(result[0]))
 			elif structure == 'cyclic' or structure == 'linear_fixed':
-				num_of_rec = fd['num_of_rec']
-				for r in range(1, num_of_rec + 1):
-					result = self._cmd.rs.read_record(r)
-					self._cmd.poutput("update_record %d %s" % (r, str(result[0])))
+				# Use number of records specified in select response
+				if 'num_of_rec' in fd:
+					num_of_rec = fd['num_of_rec']
+					for r in range(1, num_of_rec + 1):
+						result = self._cmd.rs.read_record(r)
+						self._cmd.poutput("update_record %d %s" % (r, str(result[0])))
+				# When the select response does not return the number of records, read until we hit the
+				# first record that cannot be read.
+				else:
+					r = 1
+					while True:
+						try:
+							result = self._cmd.rs.read_record(r)
+						except SwMatchError as e:
+							# We are past the last valid record - stop
+							if e.sw_actual == "9402":
+								break
+							# Some other problem occurred
+							else:
+								raise e
+						self._cmd.poutput("update_record %d %s" % (r, str(result[0])))
+						r = r + 1
 			elif structure == 'ber_tlv':
 				tags = self._cmd.rs.retrieve_tags()
 				for t in tags: