/// Copy slice of bytes only
///
/// # Notes
/// `dst` and `src` must not overlap. See [move_slice].
pub fn copy_slice(dst: &mut [u8], src: &[u8]) -> usize
{
    let sz = std::cmp::min(dst.len(),src.len());
    unsafe {
	std::ptr::copy(&src[0] as *const u8, &mut dst[0] as *mut u8, sz);
    }
    sz
}

/// Move slice of bytes only
///
/// # Notes
/// `dst` and `src` can overlap.
pub fn move_slice(dst: &mut [u8], src: &[u8]) -> usize
{
    let sz = std::cmp::min(dst.len(),src.len());
    unsafe {
	std::ptr::copy(&src[0] as *const u8, &mut dst[0] as *mut u8, sz);
    }
    sz
}