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+"""Card service abstract class.
+
+A card service is a class providings specific smart card functionality,
+e.g.  a GSM file system or an Open Platform loader.  CardService is an
+abstract class from which concrete card services are derived.  A concrete
+card service is almost always smart card operating system specific
+
+__author__ = "https://www.gemalto.com/"
+
+Copyright 2001-2012 gemalto
+Author: Jean-Daniel Aussel, mailto:jean-daniel.aussel@gemalto.com
+
+This file is part of pyscard.
+
+pyscard is free software; you can redistribute it and/or modify
+it under the terms of the GNU Lesser General Public License as published by
+the Free Software Foundation; either version 2.1 of the License, or
+(at your option) any later version.
+
+pyscard is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU Lesser General Public License for more details.
+
+You should have received a copy of the GNU Lesser General Public License
+along with pyscard; if not, write to the Free Software
+Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+"""
+
+from smartcard import CardService
+
+
+class PassThruCardService(CardService.CardService):
+    """Pass-thru card service class."""
+
+    def __init__(self, connection, cardname=None):
+        """Construct a pass-thru card service.
+
+        @param connection:     the CardConnection used to access the smart card
+        """
+        CardService.CardService.__init__(self, connection, cardname)
+
+    def __enter__(self):
+        return self
+
+    def __exit__(self, exc_type, exc_value, exc_traceback):
+        return CardService.CardService.__exit__(
+            self, exc_type, exc_value, exc_traceback
+        )
+
+    @staticmethod
+    def supports(cardname):
+        """Returns True if the cardname is supported by the card service.
+        The PassThruCardService supports all cardnames and always
+        returns True."""
+        return True
+
+
+if __name__ == "__main__":
+    # Small sample illustrating the use of CardService.
+    SELECT = [0xA0, 0xA4, 0x00, 0x00, 0x02]
+    DF_TELECOM = [0x7F, 0x10]
+    from smartcard.System import readers
+
+    cc = readers()[0].createConnection()
+    cs = PassThruCardService(cc)
+    cs.connection.connect()
+    data, sw1, sw2 = cs.connection.transmit(SELECT + DF_TELECOM)
+    print(f"{sw1:X} {sw2:X}")
+    cs.connection.disconnect()