75 lines
3.5 KiB
Python
Executable File
75 lines
3.5 KiB
Python
Executable File
#!/usr/bin/env python
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#
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###############################################################################
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# Copyright (C) 2016-2018 Cortney T. Buffington, N0MJS <n0mjs@me.com>
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# Copyright (C) 2015 by Jonathan Naylor G4KLX
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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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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) 2016-2018 Cortney T. Buffington, N0MJS and the K0USY Group'
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__credits__ = 'Jonathan Naylor, G4KLX'
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__license__ = 'GNU GPLv3'
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__maintainer__ = 'Cort Buffington, N0MJS'
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__email__ = 'n0mjs@me.com'
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#------------------------------------------------------------------------------
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# Hamming 15,11,3 routines
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#------------------------------------------------------------------------------
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# ENCODER- returns a bitarray object containing the hamming checksums
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def enc_15113(_data):
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csum = bitarray(4)
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csum[0] = _data[0] ^ _data[1] ^ _data[2] ^ _data[3] ^ _data[5] ^ _data[7] ^ _data[8]
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csum[1] = _data[1] ^ _data[2] ^ _data[3] ^ _data[4] ^ _data[6] ^ _data[8] ^ _data[9]
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csum[2] = _data[2] ^ _data[3] ^ _data[4] ^ _data[5] ^ _data[7] ^ _data[9] ^ _data[10]
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csum[3] = _data[0] ^ _data[1] ^ _data[2] ^ _data[4] ^ _data[6] ^ _data[7] ^ _data[10]
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return csum
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#------------------------------------------------------------------------------
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# Hamming 13,9,3 routines
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#------------------------------------------------------------------------------
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# ENCODER - returns a bitarray object containing the hamming checksums
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def enc_1393(_data):
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csum = bitarray(4)
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csum[0] = _data[0] ^ _data[1] ^ _data[3] ^ _data[5] ^ _data[6]
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csum[1] = _data[0] ^ _data[1] ^ _data[2] ^ _data[4] ^ _data[6] ^ _data[7]
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csum[2] = _data[0] ^ _data[1] ^ _data[2] ^ _data[3] ^ _data[5] ^ _data[7] ^ _data[8]
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csum[3] = _data[0] ^ _data[2] ^ _data[4] ^ _data[5] ^ _data[8]
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return csum
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#------------------------------------------------------------------------------
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# Hamming 16,11,4 routines
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#------------------------------------------------------------------------------
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# ENCODER - returns a bitarray object containing the hamming checksums
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def enc_16114(_data):
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assert len(_data) == 11, 'Hamming Encoder 16,11,4: Data not 11 bits long'
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csum = bitarray(5)
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csum[0] = _data[0] ^ _data[1] ^ _data[2] ^ _data[3] ^ _data[5] ^ _data[7] ^ _data[8]
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csum[1] = _data[1] ^ _data[2] ^ _data[3] ^ _data[4] ^ _data[6] ^ _data[8] ^ _data[9]
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csum[2] = _data[2] ^ _data[3] ^ _data[4] ^ _data[5] ^ _data[7] ^ _data[9] ^ _data[10]
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csum[3] = _data[0] ^ _data[1] ^ _data[2] ^ _data[4] ^ _data[6] ^ _data[7] ^ _data[10]
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csum[4] = _data[0] ^ _data[2] ^ _data[5] ^ _data[6] ^ _data[8] ^ _data[9] ^ _data[10]
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return csum |