static int intFromBytes_littleEndian_partial(byte[] a, int i) {
  ret (ubyteToInt(i+3 >= a.length ? 0 : a[i+3]) << 24
    | (ubyteToInt(i+2 >= a.length ? 0 : a[i+2]) << 16
    | (ubyteToInt(i+1 >= a.length ? 0 : a[i+1]) << 8
    | ubyteToInt(a[i]));
}