def part_decoder(self, bits, strong=False):
bad_parity_sum = 0
parity = 1
while parity <= len(bits):
summa = 0
for i in range(len(bits)):
if i+1 & parity and bits[i] == "1":
summa += 1
if summa % 2:
bad_parity_sum += parity
parity *= 2
if bad_parity_sum:
if bad_parity_sum > self.n:
raise base.UndecodeableError("bad_parity_sum={0} is greater then the code length={1}".format(bad_parity_sum, self.n))
else:
bits = base.change_bits(bits, bad_parity_sum)
return delete_parity_bits(bits)
def test_results(self):
for args, result in self.known_pairs:
self.assertEqual(base.change_bits(*args), result)
