62 lines
2.9 KiB
Python
Executable File
62 lines
2.9 KiB
Python
Executable File
#!/usr/bin/env python
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#
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# This work is licensed under the Creative Attribution-NonCommercial-ShareAlike
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# 3.0 Unported License.To view a copy of this license, visit
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# http://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to
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# Creative Commons, 444 Castro Street, Suite 900, Mountain View,
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# California, 94041, USA.
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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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__license__ = 'Creative Commons Attribution-NonCommercial-ShareAlike 3.0 Unported'
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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 |