case paxMtime:
			hdr.ModTime, err = parsePAXTime(v)
		case paxCtime:
			hdr.ChangeTime, err = parsePAXTime(v)
		case paxSize:
			hdr.Size, err = strconv.ParseInt(v, 10, 64)
		default:
			if strings.HasPrefix(k, paxSchilyXattr) {
				if hdr.Xattrs == nil {
					hdr.Xattrs = make(map[string]string)
				}
				hdr.Xattrs[k[len(paxSchilyXattr):]] = v
			}
		}
		if err != nil {
			return ErrHeader
		}
	}

func toValidName(name string) string {
	name = strings.ReplaceAll(name, `\`, `/`)
	p := path.Clean(name)

	p = strings.TrimPrefix(p, "/")

	for strings.HasPrefix(p, "../") {
		p = p[len("../"):]
	}

	return p
}

func (r *Reader) initFileList() {
	r.fileListOnce.Do(func() {
		// files and knownDirs map from a file/directory name