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I hate eye strains
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import itertools | |
def encode(s: str, encoding: str = 'utf-8', ntet: int = 8, flip: int = 0) -> str: | |
if ntet < flip: | |
raise ValueError('ntet must be less than flip.') | |
if ntet == 8 and flip == 0: | |
header = '' | |
elif ntet != 8 and flip == 0: | |
header = f'{ntet}_' | |
else: | |
header = f'{ntet}~{flip}_' | |
result = [header] | |
b = s.encode(encoding) | |
ntet_mask = (1 << ntet) - 1 | |
flip_mask = 1 << (flip - 1) if flip > 0 else 0 | |
ntet_fmt = f'{{num:0{ntet}b}}' | |
for i, octet in enumerate(b): | |
num_masked = octet & ntet_mask | |
if num_masked != octet: | |
raise ValueError(f'Encoding failed at position {i}: Cannot represent character as a {ntet}-tet') | |
encoded = ntet_fmt.format(num=num_masked ^ flip_mask) | |
result.append(encoded) | |
return ''.join(result) | |
def decode(s: str, encoding: str = 'utf-8') -> str: | |
if '_' in s: | |
header, s = s.split('_') | |
if '~' in header: | |
ntet, flip = map(int, header.split('~')) | |
else: | |
ntet = int(header) | |
flip = 0 | |
else: | |
ntet = 8 | |
flip = 0 | |
result = bytearray() | |
for bits in itertools.batched(s, ntet): | |
value = int(''.join(bits), 2) | |
if flip > 0: | |
value ^= 1 << (flip - 1) | |
result.append(value) | |
return result.decode(encoding) | |
if __name__ == '__main__': | |
print(decode('7~4_1011100110000011011010101000110111011001001110001010100011110101111101110011011110110101000110100111111000101000110010111000011101100110011011000011101111110000011111000100110')) | |
print(encode('I love cookies!', flip=1)) |
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