Sindbad~EG File Manager

<?php
// ********************************************************************************************
// Title          udde Instant Messages (uddeIM)
// Description    Instant Messages System for Mambo 4.5 / Joomla 1.0 / Joomla 1.5
// Author         � 2007-2010 Stephan Slabihoud
// License        This is free software and you may redistribute it under the GPL.
//                uddeIM comes with absolutely no warranty.
//                Use at your own risk. For details, see the license at
//                http://www.gnu.org/licenses/gpl.txt
//                Other licenses can be found in LICENSES folder.
//                Redistributing this file is only allowed when keeping the header unchanged.
// ********************************************************************************************

session_start();
				
//if(session_id() == "") {
//	// session exists
//} else {
//	if (!function_exists("session_regenerate_id")) {
//		session_start();
//	} else {
//		session_regenerate_id();
//	}
//}

/*
* File: CaptchaSecurityImages.php - Class: CaptchaSecurityImages
* Author: Simon Jarvis
* Copyright: 2006 Simon Jarvis
* Date: 03/08/06
* Updated: 07/02/07
* Requirements: PHP 4/5 with GD and FreeType libraries
* Link: http://www.white-hat-web-design.co.uk/articles/php-captcha.php
* 
* This program is free software; you can redistribute it and/or 
* modify it under the terms of the GNU General Public License 
* as published by the Free Software Foundation; either version 2 
* of the License, or (at your option) any later version.
* 
* This program is distributed in the hope that it will be useful, 
* but WITHOUT ANY WARRANTY; without even the implied warranty of 
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 
* GNU General Public License for more details: 
* http://www.gnu.org/licenses/gpl.html
*
*/

class CaptchaSecurityImages {

	var $font = 'monofont.ttf';

	function generateCode($characters) {
		/* list all possible characters, similar looking characters and vowels have been removed */
		$possible = '23456789bcdfghjkmnpqrstvwxyz';
		$code = '';
		$i = 0;
		while ($i < $characters) { 
			$code .= substr($possible, mt_rand(0, strlen($possible)-1), 1);
			$i++;
		}
		return $code;
	}

	function __construct($width='120',$height='40',$characters='6') {
		$code = $this->generateCode($characters);
		/* font size will be 75% of the image height */
		$font_size = $height * 0.75;
		$image = @imagecreate($width, $height) or die('Cannot initialize new GD image stream');
		/* set the colours */
		$background_color = imagecolorallocate($image, 255, 255, 255);
		$text_color = imagecolorallocate($image, 20, 40, 100);
		$noise_color = imagecolorallocate($image, 100, 120, 180);
		/* generate random dots in background */
		for( $i=0; $i<($width*$height)/3; $i++ ) {
			imagefilledellipse($image, mt_rand(0,$width), mt_rand(0,$height), 1, 1, $noise_color);
		}
		/* generate random lines in background */
		for( $i=0; $i<($width*$height)/150; $i++ ) {
			imageline($image, mt_rand(0,$width), mt_rand(0,$height), mt_rand(0,$width), mt_rand(0,$height), $noise_color);
		}
		/* create textbox and add text */
	    $thispath = dirname(__FILE__) . '/';
		$textbox = imagettfbbox($font_size, 0, $thispath.$this->font, $code) or die('Error in imagettfbbox function');
		$x = ($width - $textbox[4])/2;
		$y = ($height - $textbox[5])/2;
		imagettftext($image, $font_size, 0, $x, $y, $text_color, $thispath.$this->font , $code) or die('Error in imagettftext function');
		/* output captcha image to browser */
		header('Content-Type: image/jpeg');
		imagejpeg($image);
		imagedestroy($image);

//		$old = "";
//		if (!session_id()) {
//			$old = session_name();
//			session_name("uddeim");
//			session_start();
//		}
		$_SESSION['security_code'] = $code;
//		if ($old)
//			session_name($old);
	}
}

//unset($_SESSION['security_code']);

define("_VALID_MOS", 1 ); 
require(dirname(__FILE__)."/../../administrator/components/com_uddeim/config.class.php");
$config = new uddeimconfigclass();

$captcha = new CaptchaSecurityImages($config->captchalen * 20, 32, $config->captchalen);