if err != nil {
		return 0, nil, err
	}

	info, err := obj.Stat()
	if err != nil {
		return 0, nil, err
	}

	return info.Size - offset, obj, nil
}

// PutFile implements ftpDriver
func (driver *ftpDriver) PutFile(ctx *ftp.Context, objPath string, data io.Reader, offset int64) (n int64, err error) {
	stopFn := globalFtpMetrics.log(ctx, objPath)
	defer stopFn(err)