If the argument to [FileInfoHeader] implements the new [FileInfoNames]
interface, then the interface methods will be used to set the Uname/Gname
of the file header. This allows applications to override the system-dependent

func (fi headerFileInfo) Info() (fs.FileInfo, error) { return fi, nil }

func (fi headerFileInfo) String() string {
	return fs.FormatFileInfo(fi)
}

// FileInfoHeader creates a partially-populated [FileHeader] from an
// fs.FileInfo.
// Because fs.FileInfo's Name method returns only the base name of
// the file it describes, it may be necessary to modify the Name field

	// Header.FileInfo understands these, but FileInfoHeader will never produce these.
	c_ISDIR  = 040000  // Directory
	c_ISFIFO = 010000  // FIFO
	c_ISREG  = 0100000 // Regular file
	c_ISLNK  = 0120000 // Symbolic link
	c_ISBLK  = 060000  // Block special file
	c_ISCHR  = 020000  // Character special file
	c_ISSOCK = 0140000 // Socket
)

// FileInfoHeader creates a partially-populated [Header] from fi.

		t.Errorf("ModTime = %v; want %v", g, e)
	}
	// FileInfoHeader should error when passing nil FileInfo
	if _, err := FileInfoHeader(nil, ""); err == nil {
		t.Fatalf("Expected error when passing nil to FileInfoHeader")
	}
}

func TestFileInfoHeaderDir(t *testing.T) {
	fi, err := os.Stat("testdata")
	if err != nil {
		t.Fatal(err)
	}
	h, err := FileInfoHeader(fi, "")
	if err != nil {

	}
}

func testHeaderRoundTrip(fh *FileHeader, wantUncompressedSize uint32, wantUncompressedSize64 uint64, t *testing.T) {
	fi := fh.FileInfo()
	fh2, err := FileInfoHeader(fi)
	if err != nil {
		t.Fatal(err)
	}
	if got, want := fh2.Name, fh.Name; got != want {
		t.Errorf("Name: got %s, want %s\n", got, want)
	}

			}
		})
	}
}

func TestPax(t *testing.T) {
	// Create an archive with a large name
	fileinfo, err := os.Stat("testdata/small.txt")
	if err != nil {
		t.Fatal(err)
	}
	hdr, err := FileInfoHeader(fileinfo, "")
	if err != nil {
		t.Fatalf("os.Stat: %v", err)
	}
	// Force a PAX long name to be written
	longName := strings.Repeat("ab", 100)
	contents := strings.Repeat(" ", int(hdr.Size))

			return err
		}
		// TODO(#49580): Handle symlinks when fs.ReadLinkFS is available.
		if !info.Mode().IsRegular() {
			return errors.New("tar: cannot add non-regular file")
		}
		h, err := FileInfoHeader(info, "")
		if err != nil {
			return err
		}
		h.Name = name
		if err := tw.WriteHeader(h); err != nil {
			return err
		}
		f, err := fsys.Open(name)
		if err != nil {
			return err

			return nil
		}
		info, err := d.Info()
		if err != nil {
			return err
		}
		if !info.Mode().IsRegular() {
			return errors.New("zip: cannot add non-regular file")
		}
		h, err := FileInfoHeader(info)
		if err != nil {
			return err
		}
		h.Name = name
		h.Method = Deflate
		fw, err := w.CreateHeader(h)
		if err != nil {
			return err
		}
		f, err := fsys.Open(name)

pkg archive/tar, var ErrHeader error
pkg archive/tar, var ErrWriteAfterClose error
pkg archive/tar, var ErrWriteTooLong error
pkg archive/zip, const Deflate uint16
pkg archive/zip, const Store uint16
pkg archive/zip, func FileInfoHeader(os.FileInfo) (*FileHeader, error)
pkg archive/zip, func NewReader(io.ReaderAt, int64) (*Reader, error)
pkg archive/zip, func NewWriter(io.Writer) *Writer
pkg archive/zip, func OpenReader(string) (*ReadCloser, error)

pkg archive/tar, const TypeReg = 48
pkg archive/tar, const TypeRegA = 0
pkg archive/tar, const TypeSymlink = 50
pkg archive/tar, const TypeXGlobalHeader = 103
pkg archive/tar, const TypeXHeader = 120
pkg archive/tar, func FileInfoHeader(os.FileInfo, string) (*Header, error)
pkg archive/tar, method (*Header) FileInfo() os.FileInfo
pkg archive/zip, const Deflate = 8
pkg archive/zip, const Store = 0