fn main() {
    let a: Vec<String> = std::env::args().collect();
    let b = std::fs::read(&a[1]).unwrap();
    let stride: usize = a[2].parse().unwrap();
    let want: usize = a[3].parse().unwrap();
    let s = sylpheed_formats::mesh::debug_vertex_run_starts(&b, stride);
    println!("{} candidate starts at stride {}", s.len(), stride);
    println!("contains {:#x}: {}", want, s.contains(&want));
    let near: Vec<String> = s
        .iter()
        .filter(|&&o| o.abs_diff(want) < 0x200)
        .map(|o| format!("{o:#x}"))
        .collect();
    println!("nearby: {}", near.join(" "));
}