return "unknown error"
}

// readOptionalHeader accepts an io.ReadSeeker pointing to optional header in the PE file
// and its size as seen in the file header.
// It parses the given size of bytes and returns optional header. It infers whether the
// bytes being parsed refer to 32 bit or 64 bit version of optional header.
func readOptionalHeader(r io.ReadSeeker, sz uint16) (any, error) {

func (r *RealDependencies) Run(cmd constants.IptablesCmd, iptVer *IptablesVersion, stdin io.ReadSeeker, args ...string) error {
	return r.executeXTables(cmd, iptVer, false, stdin, args...)
}

// RunQuietlyAndIgnore runs a command quietly and ignores errors
func (r *RealDependencies) RunQuietlyAndIgnore(cmd constants.IptablesCmd, iptVer *IptablesVersion, stdin io.ReadSeeker, args ...string) {
	_ = r.executeXTables(cmd, iptVer, true, stdin, args...)

func (r errorReader) Seek(offset int64, whence int) (int64, error) {
	return 0, r.error
}

func (r errorReader) Close() error {
	return r.error
}

// readSeekerFromReader converts an io.Reader into an io.ReadSeeker.
// In general Seek may not be efficient, but it is optimized for
// common cases such as seeking to the end to find the length of the
// data.
type readSeekerFromReader struct {
	reset  func() (io.Reader, error)

// Data reads and returns the contents of the Plan 9 a.out section.
func (s *Section) Data() ([]byte, error) {
	return saferio.ReadDataAt(s.sr, uint64(s.Size), 0)
}

// Open returns a new ReadSeeker reading the Plan 9 a.out section.
func (s *Section) Open() io.ReadSeeker { return io.NewSectionReader(s.sr, 0, 1<<63-1) }

// A Symbol represents an entry in a Plan 9 a.out symbol table section.
type Sym struct {
	Value uint64
	Type  rune
	Name  string

	req.Header.Set("Authorization", auth)

	return signature, nil
}

// Returns new HTTP request object.
func newTestStreamingRequest(method, urlStr string, dataLength, chunkSize int64, body io.ReadSeeker) (*http.Request, error) {
	if method == "" {
		method = http.MethodPost
	}

	req, err := http.NewRequest(method, urlStr, nil)
	if err != nil {
		return nil, err
	}

	if body == nil {

}

// Data reads and returns the contents of the segment.
func (s *Segment) Data() ([]byte, error) {
	return saferio.ReadDataAt(s.sr, s.Filesz, 0)
}

// Open returns a new ReadSeeker reading the segment.
func (s *Segment) Open() io.ReadSeeker { return io.NewSectionReader(s.sr, 0, 1<<63-1) }

type SectionHeader struct {
	Name   string
	Seg    string
	Addr   uint64
	Size   uint64
	Offset uint32
	Align  uint32

				tr = NewReader(&reader{strings.NewReader(v.input)})
				s1, s2 = "io.Reader", "manual"
			case 2:
				tr = NewReader(&readSeeker{strings.NewReader(v.input)})
				s1, s2 = "io.ReadSeeker", "auto"
			case 3:
				tr = NewReader(&readSeeker{strings.NewReader(v.input)})
				s1, s2 = "io.ReadSeeker", "manual"
			case 4:
				tr = NewReader(&readBadSeeker{strings.NewReader(v.input)})
				s1, s2 = "ReadBadSeeker", "auto"

	goos     string // GOOS setting from run that produced counter data
	mr       io.ReadSeeker
	hdr      coverage.CounterFileHeader
	ftr      coverage.CounterFileFooter
	shdr     coverage.CounterSegmentHeader
	u32b     []byte
	u8b      []byte
	fcnCount uint32
	segCount uint32
	debug    bool
}

func NewCounterDataReader(fn string, rs io.ReadSeeker) (*CounterDataReader, error) {
	cdr := &CounterDataReader{
		mr:   rs,

//
// At the moment this package only provides APIs for looking at
// aux symbols of format 5 (associated with section definition symbols).
func readCOFFSymbols(fh *FileHeader, r io.ReadSeeker) ([]COFFSymbol, error) {
	if fh.PointerToSymbolTable == 0 {
		return nil, nil
	}
	if fh.NumberOfSymbols <= 0 {
		return nil, nil
	}
	_, err := r.Seek(int64(fh.PointerToSymbolTable), io.SeekStart)

// ServeContent uses it to handle requests using If-Match, If-None-Match, or If-Range.
//
// Note that [*os.File] implements the [io.ReadSeeker] interface.
func ServeContent(w ResponseWriter, req *Request, name string, modtime time.Time, content io.ReadSeeker) {
	sizeFunc := func() (int64, error) {
		size, err := content.Seek(0, io.SeekEnd)
		if err != nil {
			return 0, errSeeker
		}