#[no_mangle]
pub fn hextobin1(ch: u8) -> u8 {
    match ch {
        b'0' => 0,
        b'1' => 1,
        b'2' => 2,
        b'3' => 3,
        b'4' => 4,
        b'5' => 5,
        b'6' => 6,
        b'7' => 7,
        b'8' => 8,
        b'9' => 9,
        b'a' | b'A' => 10,
        b'b' | b'B' => 11,
        b'c' | b'C' => 12,
        b'd' | b'D' => 13,
        b'e' | b'E' => 14,
        b'f' | b'F' => 15,
        _ => 16,
    }
}

#[no_mangle]
pub fn hextobin2(ch: u8) -> u8 {
    match ch {
        b'0'..=b'9' => ch - b'0',
        b'a'..=b'f' => ch - b'a' + 10,
        b'A'..=b'F' => ch - b'A' + 10,
        _ => 16,
    }
}