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#!/usr/bin/env python
# -*- coding: utf-8 -*-
""" pySim: various utilities
"""
#
# Copyright (C) 2009-2010 Sylvain Munaut <tnt@246tNt.com>
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 2 of the License, or
# (at your option) any later version.
#
# This program 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 General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
def h2b(s):
return ''.join([chr((int(x,16)<<4)+int(y,16)) for x,y in zip(s[0::2], s[1::2])])
def b2h(s):
return ''.join(['%02x'%ord(x) for x in s])
def h2i(s):
return [(int(x,16)<<4)+int(y,16) for x,y in zip(s[0::2], s[1::2])]
def i2h(s):
return ''.join(['%02x'%(x) for x in s])
def swap_nibbles(s):
return ''.join([x+y for x,y in zip(s[1::2], s[0::2])])
def rpad(s, l, c='f'):
return s + c * (l - len(s))
def lpad(s, l, c='f'):
return c * (l - len(s)) + s
def dec_imsi(ef):
"""Converts an EF value to the imsi string representation"""
if len(ef) < 4:
return None
l = int(ef[0:2]) * 2 # Length of the IMSI string
swapped = swap_nibbles(ef[2:])
oe = (int(swapped[0])>>3) & 1 # Odd (1) / Even (0)
if oe:
l = l-1
if l+1 > len(swapped):
return None
imsi = swapped[1:l+2]
return imsi
def dec_iccid(ef):
return swap_nibbles(ef).strip('f')
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