input := bytes.Repeat([]byte{'a'}, count)

	t.Run("small", func(t *testing.T) {
		got, err := ReadDataAt(bytes.NewReader(input), count, 0)
		if err != nil {
			t.Fatal(err)
		}
		if !bytes.Equal(got, input) {
			t.Errorf("got %v, want %v", got, input)
		}
	})

	t.Run("large", func(t *testing.T) {
		_, err := ReadDataAt(bytes.NewReader(input), 10<<30, 0)
		if err == nil {
			t.Error("large read succeeded unexpectedly")

			return nil, err
		}
		buf = append(buf, buf1[:next]...)
		n -= next
	}
	return buf, nil
}

// ReadDataAt reads n bytes from the input stream at off, but avoids
// allocating all n bytes if n is large. This avoids crashing the program
// by allocating all n bytes in cases where n is incorrect.
func ReadDataAt(r io.ReaderAt, n uint64, off int64) ([]byte, error) {
	if int64(n) < 0 || n != uint64(int(n)) {

// Data reads and returns the contents of the PE section s.
//
// If s.Offset is 0, the section has no contents,
// and Data will always return a non-nil error.
func (s *Section) Data() ([]byte, error) {
	return saferio.ReadDataAt(s.sr, uint64(s.Size), 0)
}

// Open returns a new ReadSeeker reading the PE section s.
//
// If s.Offset is 0, the section has no contents, and all calls
// to the returned reader will return a non-nil error.

	// with other clients.
	io.ReaderAt
	sr *io.SectionReader
}

// 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) }