}
	rc = &checksumReader{
		rc:   rc,
		hash: crc32.NewIEEE(),
		f:    f,
		desr: desr,
	}
	return rc, nil
}

// OpenRaw returns a [Reader] that provides access to the [File]'s contents without
// decompression.
func (f *File) OpenRaw() (io.Reader, error) {
	bodyOffset, err := f.findBodyOffset()
	if err != nil {
		return nil, err
	}

}

// Copy copies the file f (obtained from a [Reader]) into w. It copies the raw
// form directly bypassing decompression, compression, and validation.
func (w *Writer) Copy(f *File) error {
	r, err := f.OpenRaw()
	if err != nil {
		return err
	}
	// Copy the FileHeader so w doesn't store a pointer to the data
	// of f's entire archive. See #65499.
	fh := f.FileHeader
	fw, err := w.CreateRaw(&fh)
	if err != nil {