// baseOffset is 0, then just use a baseOffset of 0.
	// We've seen files in which the directory end data gives us
	// an incorrect baseOffset.
	if baseOffset > 0 {
		off := int64(d.directoryOffset)
		rs := io.NewSectionReader(r, off, size-off)
		if readDirectoryHeader(&File{}, rs) == nil {
			baseOffset = 0
		}
	}

	return d, baseOffset, nil
}

// findDirectory64End tries to read the zip64 locator just before the

      }
    }
  }

  // Unsafe mechanics
  private static final Unsafe UNSAFE;
  private static final long BASE_OFFSET;
  private static final long BUSY_OFFSET;

  static {
    try {
      UNSAFE = getUnsafe();
      Class<?> sk = Striped64.class;
      BASE_OFFSET = UNSAFE.objectFieldOffset(sk.getDeclaredField("base"));
      BUSY_OFFSET = UNSAFE.objectFieldOffset(sk.getDeclaredField("busy"));

      }
    }
  }

  // Unsafe mechanics
  private static final Unsafe UNSAFE;
  private static final long BASE_OFFSET;
  private static final long BUSY_OFFSET;

  static {
    try {
      UNSAFE = getUnsafe();
      Class<?> sk = Striped64.class;
      BASE_OFFSET = UNSAFE.objectFieldOffset(sk.getDeclaredField("base"));
      BUSY_OFFSET = UNSAFE.objectFieldOffset(sk.getDeclaredField("busy"));