}
	if got := f.Offset(Pos(base + fsize + 1)); got != fsize {
		t.Errorf("offset = %d, want %d", got, fsize)
	}

	// out-of-bounds offsets must not lead to a panic when calling f.Pos
	if got := f.Pos(-1); got != Pos(base) {
		t.Errorf("pos = %d, want %d", got, base)
	}
	if got := f.Pos(fsize + 1); got != Pos(base+fsize) {
		t.Errorf("pos = %d, want %d", got, base+fsize)
	}

func quotToFloat32(a, b nat) (f float32, exact bool) {
	const (
		// float size in bits
		Fsize = 32

		// mantissa
		Msize  = 23
		Msize1 = Msize + 1 // incl. implicit 1
		Msize2 = Msize1 + 1

		// exponent
		Esize = Fsize - Msize1
		Ebias = 1<<(Esize-1) - 1
		Emin  = 1 - Ebias
		Emax  = Ebias
	)

	// TODO(adonovan): specialize common degenerate cases: 1.0, integers.

	case asmComplex:
		fsize := size / 2
		cc = append(cc, newComponent(suffix+"_real", asmKind(fsize), fmt.Sprintf("real(complex%d)", size*8), off, fsize, suffix))
		cc = append(cc, newComponent(suffix+"_imag", asmKind(fsize), fmt.Sprintf("imag(complex%d)", size*8), off+fsize, fsize, suffix))

	case asmStruct:
		tu := t.Underlying().(*types.Struct)

		fsize := size + size&1
		if fsize < 0 || fsize < size {
			return errCorruptArchive
		}
		switch name {
		case "__.PKGDEF":
			r.a.Entries = append(r.a.Entries, Entry{
				Name:  name,
				Type:  EntryPkgDef,
				Mtime: mtime,
				Uid:   uid,
				Gid:   gid,
				Mode:  mode,
				Data:  Data{r.offset, size},
			})
			r.skip(size)
		case "preferlinkext", "dynimportfail":
			if size == 0 {

	Gid      uint32
	Rdev     uint64
	Ssize    int32
	Atim     StTimespec_t
	Mtim     StTimespec_t
	Ctim     StTimespec_t
	Blksize  int64
	Blocks   int64
	Vfstype  int32
	Vfs      uint32
	Type     uint32
	Gen      uint32
	Reserved [9]uint32
	Padto_ll uint32
	Size     int64
}

type Statfs_t struct {
	Version   int32
	Type      int32
	Bsize     uint64
	Blocks    uint64
	Bfree     uint64

}
type Fsid64_t struct {
	Val [2]uint64
}

type Statfs_t struct {
	Version   int32
	Type      int32
	Bsize     uint32
	Blocks    uint32
	Bfree     uint32
	Bavail    uint32
	Files     uint32
	Ffree     uint32
	Fsid      Fsid_t
	Vfstype   int32
	Fsize     uint32
	Vfsnumber int32
	Vfsoff    int32
	Vfslen    int32
	Vfsvers   int32
	Fname     [32]uint8
	Fpack     [32]uint8

}
type Fsid64_t struct {
	Val [2]uint64
}

type Statfs_t struct {
	Version   int32
	Type      int32
	Bsize     uint64
	Blocks    uint64
	Bfree     uint64
	Bavail    uint64
	Files     uint64
	Ffree     uint64
	Fsid      Fsid64_t
	Vfstype   int32
	Fsize     uint64
	Vfsnumber int32
	Vfsoff    int32
	Vfslen    int32
	Vfsvers   int32
	Fname     [32]uint8
	Fpack     [32]uint8

		$2 ~ /^SIOC/ ||
		$2 ~ /^TIOC/ ||
		$2 !~ "RTF_BITS" &&
		$2 ~ /^(IFF|IFT|NET_RT|RTM|RTF|RTV|RTA|RTAX)_/ ||
		$2 ~ /^BIOC/ ||
		$2 ~ /^RUSAGE_(SELF|CHILDREN|THREAD)/ ||
		$2 ~ /^RLIMIT_(AS|CORE|CPU|DATA|FSIZE|NOFILE|STACK)|RLIM_INFINITY/ ||
		$2 ~ /^PRIO_(PROCESS|PGRP|USER)/ ||
		$2 ~ /^CLONE_[A-Z_]+/ ||
		$2 !~ /^(BPF_TIMEVAL)$/ &&
		$2 ~ /^(BPF|DLT)_/ ||
		$2 !~ "WMESGLEN" &&

		$2 ~ /^SIOC/ ||
		$2 ~ /^TIOC/ ||
		$2 !~ "RTF_BITS" &&
		$2 ~ /^(IFF|IFT|NET_RT|RTM|RTF|RTV|RTA|RTAX)_/ ||
		$2 ~ /^BIOC/ ||
		$2 ~ /^RUSAGE_(SELF|CHILDREN|THREAD)/ ||
		$2 ~ /^RLIMIT_(AS|CORE|CPU|DATA|FSIZE|NOFILE|STACK)|RLIM_INFINITY/ ||
		$2 ~ /^PRIO_(PROCESS|PGRP|USER)/ ||
		$2 !~ /^(BPF_TIMEVAL)$/ &&
		$2 ~ /^(BPF|DLT)_/ ||
		$2 !~ "WMESGLEN" &&
		$2 ~ /^W[A-Z0-9]+$/ {printf("\t%s = C.%s\n", $2, $2)}

		$2 ~ /^LOCK_(SH|EX|NB|UN)$/ ||
		$2 ~ /^LO_(KEY|NAME)_SIZE$/ ||
		$2 ~ /^LOOP_(CLR|CTL|GET|SET)_/ ||
		$2 == "LOOP_CONFIGURE" ||
		$2 ~ /^(AF|SOCK|SO|SOL|IPPROTO|IP|IPV6|TCP|MCAST|EVFILT|NOTE|SHUT|PROT|MAP|MREMAP|MFD|T?PACKET|MSG|SCM|MCL|DT|MADV|PR|LOCAL|TCPOPT|UDP)_/ ||
		$2 ~ /^NFC_(GENL|PROTO|COMM|RF|SE|DIRECTION|LLCP|SOCKPROTO)_/ ||
		$2 ~ /^NFC_.*_(MAX)?SIZE$/ ||
		$2 ~ /^RAW_PAYLOAD_/ ||
		$2 ~ /^[US]F_/ ||