use std::io::Cursor;

// Should check if reading $cur for $length results in a slice equal to one of expected$
macro_rules! matches_header (
    ( $cur:expr, $length:expr, $( $expected:expr), *) => {
        {
            use std::io::Read;

            let mut buf = [0;$length];
            match $cur.read(&mut buf) {
                $(
                    Ok(_) if buf == $expected => true,
                )*
                _ => false
            }
        }
    };
);

fn main() {
    let mut cur = Cursor::new([71, 73, 70, 56, 57, 97]);
    if matches_header!(cur, 6, [71, 73, 70, 56, 55, 97], [71, 73, 70, 56, 57, 97]) {
        println!("Yes!")
    } else {
        println!("No!")
    }
}