75 lines
2.2 KiB
Python
Executable File
75 lines
2.2 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 bitstring 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; Ian Wraith'
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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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def binary_196(_data):
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_data = bytearray(_data)
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_data = BitArray(_data)
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return _data[:98] + _data[-98:]
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def deint_196(_data):
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deint = BitArray(196)
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for index in range(196):
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deint[index] = _data[(index * 181) % 196]
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return deint
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def extract_196(_data):
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databits = BitArray()
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databits.append(_data[4:12])
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databits.append(_data[16:27])
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databits.append(_data[31:42])
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databits.append(_data[46:57])
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databits.append(_data[61:72])
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databits.append(_data[76:87])
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databits.append(_data[91:102])
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databits.append(_data[106:117])
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databits.append(_data[121:132])
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return databits.tobytes()
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if __name__ == '__main__':
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from binascii import b2a_hex as h
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# Validation Example
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data = '\x00\x01\x02\x03\x04\x05\x06\x07\x08\x09\x0a\x0b\x0c\x0d\x0e\x0f\x10\x11\x12\x13\x14\x15\x16\x17\x18\x19\x1a\x1b\x1c\x1d\x1e\x1f\x20'
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bin_data = binary_196(data)
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deint_data = deint_196(bin_data)
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ext_data = extract_196(deint_data)
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print('original 33 byte data block:')
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print(h(data))
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print(len(data))
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print()
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print('binary data (discarding sync)')
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print(bin_data.len)
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print(bin_data)
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print()
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print('deinterleaved binary data')
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print(deint_data.len)
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print(deint_data)
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print()
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print('decoded hex data')
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print(len(ext_data)*8)
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print(h(ext_data)) |