2016-09-13 17:23:14 -04:00
|
|
|
#!/usr/bin/env python
|
|
|
|
#
|
|
|
|
# This work is licensed under the Creative Attribution-NonCommercial-ShareAlike
|
|
|
|
# 3.0 Unported License.To view a copy of this license, visit
|
|
|
|
# http://creativecommons.org/licenses/by-nc-sa/3.0/ or send a letter to
|
|
|
|
# Creative Commons, 444 Castro Street, Suite 900, Mountain View,
|
|
|
|
# California, 94041, USA.
|
|
|
|
|
2016-09-12 21:04:47 -04:00
|
|
|
from __future__ import print_function
|
|
|
|
|
|
|
|
from bitstring import BitArray
|
|
|
|
from binascii import b2a_hex as h
|
2016-09-13 17:21:57 -04:00
|
|
|
from time import time
|
2016-09-12 21:04:47 -04:00
|
|
|
|
2016-09-13 17:21:57 -04:00
|
|
|
|
|
|
|
def binary_196(_data):
|
|
|
|
_data = bytearray(_data)
|
|
|
|
_data = BitArray(_data)
|
|
|
|
return _data[:98] + _data[-98:]
|
|
|
|
|
|
|
|
def deint_196(_data):
|
|
|
|
deint = BitArray(196)
|
|
|
|
for index in range(196):
|
|
|
|
deint[index] = _data[(index * 181) % 196]
|
|
|
|
return deint
|
|
|
|
|
|
|
|
def extract_196(_data):
|
|
|
|
databits = BitArray()
|
|
|
|
databits.append(_data[4:12])
|
|
|
|
databits.append(_data[19:30])
|
|
|
|
databits.append(_data[34:45])
|
|
|
|
databits.append(_data[49:60])
|
|
|
|
databits.append(_data[64:75])
|
|
|
|
databits.append(_data[79:90])
|
|
|
|
databits.append(_data[94:105])
|
|
|
|
databits.append(_data[109:120])
|
|
|
|
databits.append(_data[124:135])
|
|
|
|
return databits.tobytes()
|
2016-09-12 21:04:47 -04:00
|
|
|
|
|
|
|
|
2016-09-13 17:21:57 -04:00
|
|
|
if __name__ == '__main__':
|
2016-09-12 21:04:47 -04:00
|
|
|
|
2016-09-13 17:21:57 -04:00
|
|
|
# Validation Example
|
|
|
|
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'
|
|
|
|
|
|
|
|
t0 = time()
|
|
|
|
bin_data = binary_196(data)
|
|
|
|
t1 = time()
|
|
|
|
deint_data = deint_196(bin_data)
|
|
|
|
t2 = time()
|
|
|
|
ext_data = extract_196(deint_data)
|
|
|
|
t3 = time()
|
|
|
|
|
|
|
|
print('binary extraction time:', t1-t0)
|
|
|
|
print('deinterleave time: ', t2-t1)
|
|
|
|
print('byte extraction time: ',t3-t2,'\n')
|
|
|
|
|
|
|
|
print('Original 33 byte data block:')
|
|
|
|
print(h(data))
|
|
|
|
print(len(data))
|
|
|
|
print()
|
|
|
|
|
|
|
|
print('Extracted binary data (distarding sync)')
|
|
|
|
print(bin_data.len)
|
|
|
|
print(bin_data.bin)
|
|
|
|
print()
|
|
|
|
|
|
|
|
print('Deinterleaved binary data')
|
|
|
|
print(deint_data.len)
|
|
|
|
print(deint_data.bin)
|
|
|
|
print()
|
2016-09-12 21:04:47 -04:00
|
|
|
|
2016-09-13 17:21:57 -04:00
|
|
|
print('12 Bytes LC+RS (9,3)')
|
|
|
|
print(len(ext_data))
|
|
|
|
print(h(ext_data))
|