FileInputStream read(byte[] buf, int off, int len) with off+len, len
outside of specified bounds no exception is thrown.

With len outside of bounds No exception is thrown at all. Expect
  ArrayIndexOutOfBoundsException to be thrown in this case.

With len+offset outside of bounds No exception is thrown at all. Expect
  ArrayIndexOutOfBoundsException to be thrown in this case.

With offset outside of bounds ArrayIndexOutOfBoundsException thrown. OK