}
	}

	maxInt64 := uint64(1<<63 - 1)
	if d.directorySize > maxInt64 || d.directoryOffset > maxInt64 {
		return nil, 0, ErrFormat
	}

	baseOffset = directoryEndOffset - int64(d.directorySize) - int64(d.directoryOffset)

	// Make sure directoryOffset points to somewhere in our file.
	if o := baseOffset + int64(d.directoryOffset); o < 0 || o >= size {
		return nil, 0, ErrFormat
	}

}

type directoryEnd struct {
	diskNbr            uint32 // unused
	dirDiskNbr         uint32 // unused
	dirRecordsThisDisk uint64 // unused
	directoryRecords   uint64
	directorySize      uint64
	directoryOffset    uint64 // relative to file
	commentLen         uint16
	comment            string
}

// timeZone returns a *time.Location based on the provided offset.