Adding tiny url service to "tweet this" plugin?

I'd like to add another url shortening service to the tweet this plugin but I'm not sure how to do it. I'm pretty sure it's in this section of coding

Code:

function get_tweet_this_short_url() {
	global $id;
	$purl = get_permalink();
	$cached_url = get_post_meta($id, 'tweet_this_url', true);
	if($cached_url && $cached_url != 'getnew')
		return $cached_url;
	else {
		$u = tt_option('tt_url_service');
		if(ini_get('allow_url_fopen') == 1 ||
			ini_get('allow_url_fopen') == 'on' ||
			ini_get('allow_url_fopen') == 'On' ||
			function_exists('curl_init'))
				$u = $u;
			else $u = 'local';
		switch($u) {
		case 'adjix': {
			if(tt_option('tt_adjix_api_key') == '')
				$adid = '';
			else $adid = '&partnerID=' .
				tt_option('tt_adjix_api_key');
			if(tt_option('tt_ad_vu') != 'true')
				$s = '';
			else $s = '&ultraShort=y';
			$url = tt_read_file('http://api.adjix.com/shrinkLink' .
				'?url=' . $purl . $adid . $s);
			}
			break;
		case 'bit.ly':
			$url = tt_read_file('http://bit.ly/api?url=' . $purl);
			break;
		case 'h3o.de':
			$url = tt_read_file('http://h3o.de/api/index.php?' .
			'url=' . $purl);
			break;
		case 'hex.io':
			$url = str_replace('www.', '', tt_read_file('http://' .
			'www.hex.io/api-create.php?url=' . $purl));
			break;
		case 'idek.net':
			$url = tt_read_file('http://idek.net/c.php?idek-api=' .
			'true&idek-ref=Tweet+This&idek-url=' . $purl);
			break;
		case '************':
			$url = tt_read_file('http://************/api.php?longurl=' .
			$purl);
			break;
		case 'lin.cr':
			$url = tt_read_file('http://lin.cr/?mode=api&full=1' .
			'&l=' . $purl);
			break;
		case 'metamark':
			$url = tt_read_file('http://metamark.net/api/rest/' .
			'simple?long_url=' . $purl);
			break;
		case 'ri.ms':
			$url = tt_read_file('http://ri.ms/api-create.php?' .
			'url=' . $purl);
			break;
		case 'snurl':
			$url = tt_read_file('http://snurl.com/site/snip?r=' .
			'simple&link=' . $purl);
			break;
		case 'tinyurl':
			$url = tt_read_file('http://************************/' .
			'api-create.php?url=' . $purl);
			break;
		case 'urlb.at':
			$url = tt_read_file('http://urlb.at/api/rest/?url=' .
			urlencode($purl));
			break;
		case 'tweetburner': {
			if(function_exists('curl_init')) {
			$ch = curl_init('http://tweetburner.com/links');
			curl_setopt($ch,CURLOPT_RETURNTRANSFER,true);
			curl_setopt($ch,CURLOPT_POST,1);
			curl_setopt($ch,CURLOPT_POSTFIELDS,'link[url]=$purl');
			curl_setopt($ch,CURLOPT_CONNECTTIMEOUT,5);
			$url = curl_exec($ch);
			curl_close($ch);
			}
			else $u = 'local';
			}
			break;
		case 'local': {
			global $id;
			$url = get_bloginfo('url') . '/?p=' . $id;
			}
			break;
		default:
			$url = tt_read_file('http://th8.us/api.php?url=' .
			$purl . '&client=Tweet+This+v1.4.1&format=simple');
		}
		if(tt_option('tt_url_www') == 'true' && $u != 'tweetburner') {
			$url = str_replace('http://www.', 'www.', $url);
			$url = str_replace('http://', 'www.', $url);
			}
		if($u != 'local' && (strlen($url) > 30 || $url == 'Error' ||
			$url == 'www.' || $url == 'http://'))
			$url = get_bloginfo('url') . '/?p=' . $id;
		if(tt_option('tt_30') == 'true' && strlen($purl) < 30) {
			$url = $purl; if(tt_option('tt_url_www') == 'true') {
				$url = str_replace('http://www.', 'www.',
					$url);
				$url = str_replace('http://', 'www.', $url);
				}
			}
		if($cached_url == 'getnew')
			update_post_meta($id, 'tweet_this_url', $url,
			'getnew');
		else add_post_meta($id, 'tweet_this_url', $url, true);
		}
	return $url;
}


/**
 * Echoes the above function for convenience.
 */
function tweet_this_short_url() {
	echo	get_tweet_this_short_url();
}

Service I'd like to add is http://tinyftw.com

 

no one knows?