private static void checkHeaderOffset(int headerRelativeOffset) {
    if (!(0 <= headerRelativeOffset && headerRelativeOffset < FileHeader.HEADER_SIZE)) {
      throw new IndexOutOfBoundsException(
        "headerFieldOffset(=" + headerRelativeOffset + ") is outside of header [0, " + FileHeader.HEADER_SIZE + ") ");
    }
  }
private static void checkHeaderOffset(int headerRelativeOffset)