use std::fs::File;
use std::io;
use std::io::prelude::*;

pub fn read_bin_file(filename: &str) -> io::Result<Vec<u8>> {
    let mut buf = Vec::new();
    let mut file = File::open(filename)?;
    file.read_to_end(&mut buf)?;
    Ok(buf)
}

#[macro_export]
macro_rules! index2d {
    ($x:expr, $y:expr, $w:expr) => {
        $w * $y + $x
    };
    ($t:ty, $x:expr, $y:expr, $w:expr) => {
        (($w as $t) * ($y as $t) + ($x as $t)) as $t
    };
}