2016-09-30 15:16:53 -04:00
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#!/usr/bin/env python
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#
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2016-11-21 20:13:32 -05:00
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###############################################################################
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# Copyright (C) 2016 Cortney T. Buffington, N0MJS <n0mjs@me.com>
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software Foundation,
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# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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###############################################################################
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2016-09-30 15:16:53 -04:00
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from __future__ import print_function
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from bitarray import bitarray
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# Does anybody read this stuff? There's a PEP somewhere that says I should do this.
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__author__ = 'Cortney T. Buffington, N0MJS'
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__copyright__ = 'Copyright (c) 2016 Cortney T. Buffington, N0MJS and the K0USY Group'
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__credits__ = 'Jonathan Naylor, G4KLX'
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2016-11-22 21:02:09 -05:00
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__license__ = 'GNU GPLv3'
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2016-09-30 15:16:53 -04:00
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__maintainer__ = 'Cort Buffington, N0MJS'
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__email__ = 'n0mjs@me.com'
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def csum5(_data):
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_data = bytearray(_data)
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accum = 0
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assert len(_data) == 9, 'csum5 expected 9 bytes of data and got something else'
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2016-10-19 16:52:43 -04:00
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2016-09-30 15:16:53 -04:00
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for i in xrange(9):
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accum += _data[i]
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accum = chr(accum % 31)
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csum = bitarray()
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csum.frombytes(accum)
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del csum[0:3]
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2016-10-19 16:52:43 -04:00
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2016-09-30 15:16:53 -04:00
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return csum
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if __name__ == '__main__':
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from binascii import b2a_hex as h
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message = '\x00\x10\x20\x00\x0c\x30\x2f\x9b\xe5'
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result = csum5(message)
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print(result, type(result))
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