code: public static void arrayCopy(Object src, int offset, int byteLength, Object dest, int dest_offset)
              throws IOException
      {
          impl.arrayCopy(src, offset, byteLength, dest, dest_offset);
      }
docs: Copy bytes from source to destination
  
  @param src pointer to the source array
  @param offset byte offset in the source array
  @param byteLength the number of bytes to copy
  @param dest pointer to the destination array
  @param dest_offset byte offset in the destination array
  @throws IOException