<?php





session_start();





/*





* File: CaptchaSecurityImages.php





* 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





*





*/











define( '_JEXEC', 1 );





if(!defined('DS')){





 define('DS',DIRECTORY_SEPARATOR);





}





define( 'JPATH_BASE', realpath(dirname(__FILE__).'/../../..' ));





require_once ( JPATH_BASE .DS.'includes'.DS.'defines.php' );





require_once ( JPATH_BASE .DS.'includes'.DS.'framework.php' );





JDEBUG ? $_PROFILER->mark( 'afterLoad' ) : null;





$mainframe =& JFactory::getApplication('site');





$mainframe->initialise();





JPluginHelper::importPlugin('system');





JDEBUG ? $_PROFILER->mark('afterInitialise') : null;





$mainframe->triggerEvent('onAfterInitialise');





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 CaptchaSecurityImages($width='90',$height='30',$characters='6') {

	$path1= JPATH_BASE ."/modules/mod_s5_register/captcha/monofont.ttf";
		
		$this->font = $path1;

		if($_SESSION['security_code']!='')

			 $code = $_SESSION['security_code'];

		else 

			$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, 38, 38, 38);





		$noise_color = imagecolorallocate($image, 198, 198, 198);





		/* 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 */





		$textbox = imagettfbbox($font_size, 0, $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, $this->font , $code) or die('Error in imagettftext function');





		/* output captcha image to browser */





		header('Content-Type: image/jpeg');





		imagejpeg($image);





		imagedestroy($image);





		$_SESSION['security_code'] = $code;





		$app = &JFactory::getApplication();





		$app->setUserState('security_code',$code);





	}





}





$width = isset($_GET['width']) ? $_GET['width'] : '90';





$height = isset($_GET['height']) ? $_GET['height'] : '30';





$characters = isset($_GET['characters']) && $_GET['characters'] > 1 ? $_GET['characters'] : '6';





$captcha = new CaptchaSecurityImages($width,$height,$characters);





?>