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"""smartcard.guid
Utility functions to handle GUIDs as strings or list of bytes
__author__ = "http://www.gemalto.com"
Copyright 2001-2010 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 struct import unpack
# guid is ulong+ushort+ushort+uchar[8]; we need a map because bytes
# are swappted for the first three
map={ 0:3, 1:2, 2:1, 3:0, 4:5, 5:4, 6:7, 7:6, 8:8, 9:9, 10:10, 11:11, 12:12, 13:13, 14:14, 15:15 }
def strToGUID( s ):
"""Converts a GUID string into a list of bytes."""
l=[]
for i in unpack( 'x' + '2s'*4 + 'x' + '2s2sx'*3 + '2s'*6 + 'x', s ):
l += [ int( i, 16) ]
zr=[]
for i in xrange(len(l)):
zr.append(l[map[i]])
return zr
def GUIDToStr( g ):
"""Converts a GUID sequence of bytes into a string."""
zr=[]
for i in xrange(len(g)):
zr.append(g[map[i]])
return "{%2X%2X%2X%2X-%2X%2X-%2X%2X-%2X%2X-%2X%2X%2X%2X%2X%2X}" % tuple(zr)
if __name__ == "__main__":
"""Small sample illustrating the use of guid.py."""
import smartcard.guid
dummycardguid1 = strToGUID('{AD4F1667-EA75-4124-84D4-641B3B197C65}')
print dummycardguid1
print GUIDToStr(dummycardguid1)
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