mode |= fs.ModeDir
	}
	return mode
}

// SetMode changes the permission and mode bits for the [FileHeader].
func (h *FileHeader) SetMode(mode fs.FileMode) {
	h.CreatorVersion = h.CreatorVersion&0xff | creatorUnix<<8
	h.ExternalAttrs = fileModeToUnixMode(mode) << 16

	// set MSDOS attributes too, as the original zip does.
	if mode&fs.ModeDir != 0 {
		h.ExternalAttrs |= msdosDir
	}

At previous versions (`winsymlink=0`), mount points are treated as symlinks,
and other reparse points with non-default [`os.ModeType`](/pkg/os#ModeType) bits
(such as [`os.ModeDir`](/pkg/os#ModeDir)) do not have the `ModeIrregular` bit set.

Go 1.23 changed [`os.Readlink`](/pkg/os#Readlink) and [`filepath.EvalSymlinks`](/pkg/path/filepath#EvalSymlinks)

func (f *fileListEntry) Name() string      { _, elem, _ := split(f.name); return elem }
func (f *fileListEntry) Size() int64       { return 0 }
func (f *fileListEntry) Mode() fs.FileMode { return fs.ModeDir | 0555 }
func (f *fileListEntry) Type() fs.FileMode { return fs.ModeDir }
func (f *fileListEntry) IsDir() bool       { return true }
func (f *fileListEntry) Sys() any          { return nil }

func (f *fileListEntry) ModTime() time.Time {

				Content:  []byte{},
				Mode:     fs.ModeDir | 0666,
				Modified: time.Date(2021, 12, 29, 0, 0, 0, 0, timeZone(0)),
			},
			{
				Name:     "a/b",
				Content:  []byte{},
				Mode:     0666,
				Modified: time.Date(2021, 12, 29, 0, 0, 0, 0, timeZone(0)),
			},
			{
				Name:     "a/b/",
				Content:  []byte{},
				Mode:     fs.ModeDir | 0666,

	if fi.h.Mode&c_ISVTX != 0 {
		mode |= fs.ModeSticky
	}

	// Set file mode bits; clear perm, setuid, setgid, and sticky bits.
	switch m := fs.FileMode(fi.h.Mode) &^ 07777; m {
	case c_ISDIR:
		mode |= fs.ModeDir
	case c_ISFIFO:
		mode |= fs.ModeNamedPipe
	case c_ISLNK:
		mode |= fs.ModeSymlink
	case c_ISBLK:
		mode |= fs.ModeDevice
	case c_ISCHR:
		mode |= fs.ModeDevice
		mode |= fs.ModeCharDevice

pkg os/user, type UnknownUserError string
pkg os/user, type UnknownUserIdError int
pkg os/user, type User struct
pkg os/user, type User struct, Gid string
pkg os/user, type User struct, HomeDir string
pkg os/user, type User struct, Name string
pkg os/user, type User struct, Uid string
pkg os/user, type User struct, Username string
pkg path, func Base(string) string
pkg path, func Clean(string) string

pkg io/fs, const ModeCharDevice = 2097152
pkg io/fs, const ModeCharDevice FileMode
pkg io/fs, const ModeDevice = 67108864
pkg io/fs, const ModeDevice FileMode
pkg io/fs, const ModeDir = 2147483648
pkg io/fs, const ModeDir FileMode
pkg io/fs, const ModeExclusive = 536870912
pkg io/fs, const ModeExclusive FileMode
pkg io/fs, const ModeIrregular = 524288
pkg io/fs, const ModeIrregular FileMode

pkg os (windows-amd64), const PathSeparator = 92
pkg os, const ModeAppend = 1073741824
pkg os, const ModeCharDevice = 2097152
pkg os, const ModeDevice = 67108864
pkg os, const ModeDir = 2147483648
pkg os, const ModeExclusive = 536870912
pkg os, const ModeNamedPipe = 33554432
pkg os, const ModePerm = 511
pkg os, const ModeSetgid = 4194304
pkg os, const ModeSetuid = 8388608

	}, {
		// directory.
		h: &Header{
			Name:     "dir/",
			Mode:     0755,
			Size:     0,
			ModTime:  time.Unix(1360601116, 0),
			Typeflag: TypeDir,
		},
		fm: 0755 | fs.ModeDir,
	}, {
		// fifo node.
		h: &Header{
			Name:     "dev/initctl",
			Mode:     0600,
			Size:     0,
			ModTime:  time.Unix(1360578949, 0),
			Typeflag: TypeFifo,
		},

pkg os (linux-arm-cgo), const O_SYNC = 1052672
pkg os (linux-arm-cgo), const O_SYNC = 4096
pkg os, const ModeAppend FileMode
pkg os, const ModeCharDevice FileMode
pkg os, const ModeDevice FileMode
pkg os, const ModeDir FileMode
pkg os, const ModeExclusive FileMode
pkg os, const ModeIrregular FileMode
pkg os, const ModeNamedPipe FileMode
pkg os, const ModePerm FileMode
pkg os, const ModeSetgid FileMode
pkg os, const ModeSetuid FileMode