Function utf8_len

std/json/src/main/tokenizer.rs:177–183

(b: u8)

}

fn utf8_len(b: u8) -> Option<usize> {
    if b < 0x80 { Some(1) }
    else if b & 0xE0 == 0xC0 { Some(2) }
    else if b & 0xF0 == 0xE0 { Some(3) }
    else if b & 0xF8 == 0xF0 { Some(4) }
    else { None }
}