// Set file permission bits.
	mode = fs.FileMode(fi.h.Mode).Perm()

	// Set setuid, setgid and sticky bits.
	if fi.h.Mode&c_ISUID != 0 {
		mode |= fs.ModeSetuid
	}
	if fi.h.Mode&c_ISGID != 0 {
		mode |= fs.ModeSetgid
	}
	if fi.h.Mode&c_ISVTX != 0 {
		mode |= fs.ModeSticky
	}

	// Set file mode bits; clear perm, setuid, setgid, and sticky bits.

pkg syscall, const S_IFLNK ideal-int
pkg syscall, const S_IFMT ideal-int
pkg syscall, const S_IFREG ideal-int
pkg syscall, const S_IFSOCK ideal-int
pkg syscall, const S_IRUSR ideal-int
pkg syscall, const S_ISGID ideal-int
pkg syscall, const S_ISUID ideal-int
pkg syscall, const S_ISVTX ideal-int
pkg syscall, const S_IWUSR ideal-int
pkg syscall, const S_IXUSR ideal-int
pkg syscall, const TCP_NODELAY ideal-int

pkg syscall, const S_IFIFO = 4096
pkg syscall, const S_IFLNK = 40960
pkg syscall, const S_IFREG = 32768
pkg syscall, const S_IFSOCK = 49152
pkg syscall, const S_IRUSR = 256
pkg syscall, const S_ISGID = 1024
pkg syscall, const S_ISUID = 2048
pkg syscall, const S_ISVTX = 512
pkg syscall, const S_IWUSR = 128
pkg syscall, const S_IXUSR = 64
pkg syscall, const TCP_NODELAY = 1

	s_IFMT   = 0xf000
	s_IFSOCK = 0xc000
	s_IFLNK  = 0xa000
	s_IFREG  = 0x8000
	s_IFBLK  = 0x6000
	s_IFDIR  = 0x4000
	s_IFCHR  = 0x2000
	s_IFIFO  = 0x1000
	s_ISUID  = 0x800
	s_ISGID  = 0x400
	s_ISVTX  = 0x200

	msdosDir      = 0x10
	msdosReadOnly = 0x01
)

// Mode returns the permission and mode bits for the [FileHeader].
func (h *FileHeader) Mode() (mode fs.FileMode) {

	if err != nil {
		t.Fatalf("FileInfoHeader: %v", err)
	}
	if g, e := h.Name, "testdata/"; g != e {
		t.Errorf("Name = %q; want %q", g, e)
	}
	// Ignoring c_ISGID for golang.org/issue/4867
	if g, e := h.Mode&^c_ISGID, int64(fi.Mode().Perm()); g != e {
		t.Errorf("Mode = %#o; want %#o", g, e)
	}
	if g, e := h.Size, int64(0); g != e {
		t.Errorf("Size = %v; want %v", g, e)
	}