The [SliceAt(typ Type, p unsafe.Pointer, len int)] function
returns a Value representing a slice whose underlying array starts

	}
	r.prevRune = -1
	n = copy(b, r.s[r.i:])
	r.i += int64(n)
	return
}

// ReadAt implements the [io.ReaderAt] interface.
func (r *Reader) ReadAt(b []byte, off int64) (n int, err error) {
	// cannot modify state - see io.ReaderAt
	if off < 0 {
		return 0, errors.New("bytes.Reader.ReadAt: negative offset")
	}
	if off >= int64(len(r.s)) {
		return 0, io.EOF
	}
	n = copy(b, r.s[off:])
	if n < len(b) {
		err = io.EOF

	//
	// store floats
	//
	//	LMOVW freg ',' addr
	//	{
	//		outcode(int($1), &$2, 0, &$4);
	//	}
	MOVD	F1, foo<>+3(SB)
	MOVD	F1, 16(R2)
	MOVD	F1, (R2)

	//
	// floating point status
	//
	//	LMOVW fpscr ',' freg
	//	{
	//		outcode(int($1), &$2, 0, &$4);
	//	}
	MOVW	FCR0, R1

	//	LMOVW freg ','  fpscr
	//	{
	//		outcode(int($1), &$2, 0, &$4);
	//	}
	MOVW	R1, FCR0

// The downside is that renaming uname or gname by the OS never takes effect.
var userMap, groupMap sync.Map // map[int]string

func statUnix(fi fs.FileInfo, h *Header, doNameLookups bool) error {
	sys, ok := fi.Sys().(*syscall.Stat_t)
	if !ok {
		return nil
	}
	h.Uid = int(sys.Uid)
	h.Gid = int(sys.Gid)
	if doNameLookups {
		// Best effort at populating Uname and Gname.
		// The os/user functions may fail for any number of reasons