md5.rs

fn imagehash(path: &Path) -> std::io::Result<Digest> {
    let mut f = File::open(path)?;
    let mut buffer = [0u8; 1024*1024];

    let mut context = Context::new();
    loop {
        let read = f.read(&mut buffer)?;
        if 0 == read {
            return Ok(context.compute());
        }
        context.consume(&buffer[0..read]);
    }
}