// findBodyOffset does the minimum work to verify the file has a header
// and returns the file body offset.
func (f *File) findBodyOffset() (int64, error) {
	var buf [fileHeaderLen]byte
	if _, err := f.zipr.ReadAt(buf[:], f.headerOffset); err != nil {
		return 0, err
	}
	b := readBuf(buf[:])
	if sig := b.uint32(); sig != fileHeaderSignature {
		return 0, ErrFormat
	}
	b = b[22:] // skip over most of the header

			minio.PutObjectOptions{DisableContentSha256: true},
		)
		return err
	}

	return NotImplemented{}
}

type listerAt []os.FileInfo

// Modeled after strings.Reader's ReadAt() implementation
func (f listerAt) ListAt(ls []os.FileInfo, offset int64) (int, error) {
	var n int
	if offset >= int64(len(f)) {
		return 0, io.EOF
	}
	n = copy(ls, f[offset:])
	if n < len(ls) {

	var z *Reader
	var err error
	var raw []byte
	if zt.Source != nil {
		rat, size := zt.Source()
		z, err = NewReader(rat, size)
		raw = make([]byte, size)
		if _, err := rat.ReadAt(raw, 0); err != nil {
			t.Errorf("ReadAt error=%v", err)
			return
		}
	} else {
		path := filepath.Join("testdata", zt.Name)
		if zt.Obscured {
			tf, err := obscuretestdata.DecodeToTempFile(path)
			if err != nil {

pkg debug/plan9obj, method (*File) Symbols() ([]Sym, error)
pkg debug/plan9obj, method (*Section) Data() ([]uint8, error)
pkg debug/plan9obj, method (*Section) Open() io.ReadSeeker
pkg debug/plan9obj, method (Section) ReadAt([]uint8, int64) (int, error)
pkg debug/plan9obj, type File struct
pkg debug/plan9obj, type File struct, Sections []*Section
pkg debug/plan9obj, type File struct, embedded FileHeader
pkg debug/plan9obj, type FileHeader struct

pkg debug/macho, method (LoadCmd) GoString() string
pkg debug/macho, method (LoadCmd) String() string
pkg debug/macho, method (Section) ReadAt([]uint8, int64) (int, error)
pkg debug/macho, method (Segment) Raw() []uint8
pkg debug/macho, method (Segment) ReadAt([]uint8, int64) (int, error)
pkg debug/macho, method (Symtab) Raw() []uint8
pkg debug/macho, type Cpu uint32
pkg debug/macho, type Dylib struct