/**
     * Validate an SMB URL
     *
     * @param smbUrl the SMB URL to validate
     * @return normalized safe URL
     * @throws SmbException if URL is invalid
     */
    public String validateSmbUrl(String smbUrl) throws SmbException {
        if (smbUrl == null || smbUrl.isEmpty()) {
            throw new SmbException("SMB URL cannot be null or empty");
        }

        // Check URL format