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Cort Buffington
2018-12-24 15:55:46 -06:00
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hamming.py Executable file
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#!/usr/bin/env python
#
###############################################################################
# Copyright (C) 2016-2018 Cortney T. Buffington, N0MJS <n0mjs@me.com>
# Copyright (C) 2015 by Jonathan Naylor G4KLX
#
# 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 3 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, write to the Free Software Foundation,
# Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
###############################################################################
from bitarray import bitarray
# Does anybody read this stuff? There's a PEP somewhere that says I should do this.
__author__ = 'Cortney T. Buffington, N0MJS'
__copyright__ = 'Copyright (c) 2016-2018 Cortney T. Buffington, N0MJS and the K0USY Group'
__credits__ = 'Jonathan Naylor, G4KLX'
__license__ = 'GNU GPLv3'
__maintainer__ = 'Cort Buffington, N0MJS'
__email__ = 'n0mjs@me.com'
#------------------------------------------------------------------------------
# Hamming 15,11,3 routines
#------------------------------------------------------------------------------
# ENCODER- returns a bitarray object containing the hamming checksums
def enc_15113(_data):
csum = bitarray(4)
csum[0] = _data[0] ^ _data[1] ^ _data[2] ^ _data[3] ^ _data[5] ^ _data[7] ^ _data[8]
csum[1] = _data[1] ^ _data[2] ^ _data[3] ^ _data[4] ^ _data[6] ^ _data[8] ^ _data[9]
csum[2] = _data[2] ^ _data[3] ^ _data[4] ^ _data[5] ^ _data[7] ^ _data[9] ^ _data[10]
csum[3] = _data[0] ^ _data[1] ^ _data[2] ^ _data[4] ^ _data[6] ^ _data[7] ^ _data[10]
return csum
#------------------------------------------------------------------------------
# Hamming 13,9,3 routines
#------------------------------------------------------------------------------
# ENCODER - returns a bitarray object containing the hamming checksums
def enc_1393(_data):
csum = bitarray(4)
csum[0] = _data[0] ^ _data[1] ^ _data[3] ^ _data[5] ^ _data[6]
csum[1] = _data[0] ^ _data[1] ^ _data[2] ^ _data[4] ^ _data[6] ^ _data[7]
csum[2] = _data[0] ^ _data[1] ^ _data[2] ^ _data[3] ^ _data[5] ^ _data[7] ^ _data[8]
csum[3] = _data[0] ^ _data[2] ^ _data[4] ^ _data[5] ^ _data[8]
return csum
#------------------------------------------------------------------------------
# Hamming 16,11,4 routines
#------------------------------------------------------------------------------
# ENCODER - returns a bitarray object containing the hamming checksums
def enc_16114(_data):
assert len(_data) == 11, 'Hamming Encoder 16,11,4: Data not 11 bits long'
csum = bitarray(5)
csum[0] = _data[0] ^ _data[1] ^ _data[2] ^ _data[3] ^ _data[5] ^ _data[7] ^ _data[8]
csum[1] = _data[1] ^ _data[2] ^ _data[3] ^ _data[4] ^ _data[6] ^ _data[8] ^ _data[9]
csum[2] = _data[2] ^ _data[3] ^ _data[4] ^ _data[5] ^ _data[7] ^ _data[9] ^ _data[10]
csum[3] = _data[0] ^ _data[1] ^ _data[2] ^ _data[4] ^ _data[6] ^ _data[7] ^ _data[10]
csum[4] = _data[0] ^ _data[2] ^ _data[5] ^ _data[6] ^ _data[8] ^ _data[9] ^ _data[10]
return csum