switch _, exists := paxHdrs[k]; {
			case exists:
				continue // Do not overwrite existing records
			case h.Typeflag == TypeXGlobalHeader:
				paxHdrs[k] = v // Copy all records
			case !basicKeys[k] && !strings.HasPrefix(k, paxGNUSparse):
				paxHdrs[k] = v // Ignore local records that may conflict
			}
		}
		whyOnlyPAX = "only PAX supports PAXRecords"
		format.mayOnlyBe(FormatPAX)
	}
	for k, v := range paxHdrs {

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

// name starts with a period, qualifySymbol prepends the package
// prefix. Otherwise it returns name unchanged.
func (p *Parser) qualifySymbol(name string) string {
	if strings.HasPrefix(name, ".") {
		name = p.pkgPrefix + name
	}
	return name
}

// symbolReference parses a symbol that is known not to be a register.
func (p *Parser) symbolReference(a *obj.Addr, name string, prefix rune) {

		return 0, nil
	}
	if len(f.ops) == 0 {
		return 0, errors.New("unexpected Write operation")
	}
	s, ok := f.ops[0].(string)
	if !ok {
		return 0, errors.New("unexpected Write operation")
	}

	if !strings.HasPrefix(s, string(b)) {
		return 0, testError{fmt.Errorf("got Write(%q), want Write(%q)", b, s)}
	}
	if len(s) > len(b) {
		f.ops[0] = s[len(b):]
	} else {
		f.ops = f.ops[1:]
	}
	f.pos += int64(len(b))

		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
		}
	}

		copy(blk[:], b.Bytes())
		prefix := string(blk.toUSTAR().prefix())
		prefix, _, _ = strings.Cut(prefix, "\x00") // Truncate at the NUL terminator
		if blk.getFormat() == FormatGNU && len(prefix) > 0 && strings.HasPrefix(name, prefix) {
			t.Errorf("test %d, found prefix in GNU format: %s", i, prefix)
		}

		tr := NewReader(&b)
		hdr, err := tr.Next()
		if err != nil && err != ErrInsecurePath {