// slice.
func (r *Reader) Len() int {
	if r.i >= int64(len(r.s)) {
		return 0
	}
	return int(int64(len(r.s)) - r.i)
}

// Size returns the original length of the underlying byte slice.
// Size is the number of bytes available for reading via [Reader.ReadAt].
// The result is unaffected by any method calls except [Reader.Reset].
func (r *Reader) Size() int64 { return int64(len(r.s)) }

func (f *fileListEntry) Type() fs.FileMode { return fs.ModeDir }
func (f *fileListEntry) IsDir() bool       { return true }
func (f *fileListEntry) Sys() any          { return nil }

func (f *fileListEntry) ModTime() time.Time {
	if f.file == nil {
		return time.Time{}
	}
	return f.file.FileHeader.Modified.UTC()
}

	default:
		return n, err
	}
}

func (fr *regFileReader) WriteTo(w io.Writer) (int64, error) {
	return io.Copy(w, struct{ io.Reader }{fr})
}

// logicalRemaining implements fileState.logicalRemaining.
func (fr regFileReader) logicalRemaining() int64 {
	return fr.nb
}

// physicalRemaining implements fileState.physicalRemaining.
func (fr regFileReader) physicalRemaining() int64 {
	return fr.nb
}