const arfmag = "`\n"

// arExportData takes an archive file and returns a ReadSeeker for the
// export data in that file. This assumes that there is only one
// object in the archive containing export data, which is not quite
// what gccgo does; gccgo concatenates together all the export data
// for all the objects in the file.  In practice that case does not arise.
func arExportData(archive io.ReadSeeker) (io.ReadSeeker, error) {

	switch string(magic[:]) {
	case gccgov1Magic, gccgov2Magic, gccgov3Magic, goimporterMagic:
		// Raw export data.
		reader = f
		return

	case archiveMagic, aixbigafMagic:
		reader, err = arExportData(f)
		return

	default:
		objreader = f
	}

	ef, err := elf.NewFile(objreader)
	if err == nil {
		sec := ef.Section(".go_export")
		if sec == nil {