Function cai_cyclic::decode

pub fn decode(word: u32) -> Option<(u16, usize)>

Try to decode the given 17-bit word to the nearest codeword, correcting up to 2 errors.

If decoding was successful, return Some((data, err)), where data is the 9 data bits and err is the number of corrected bits. Otherwise, return None to indicate an unrecoverable error.