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<?php
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// $Id: captcha.php 310 2006-02-19 05:31:10Z ryan $
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/*
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 Website Baker Project <http://www.websitebaker.org/>
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 Copyright (C) 2004-2006, Ryan Djurovich
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 Website Baker is free software; you can redistribute it and/or modify
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 it under the terms of the GNU General Public License as published by
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 the Free Software Foundation; either version 2 of the License, or
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 (at your option) any later version.
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 Website Baker is distributed in the hope that it will be useful,
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 but WITHOUT ANY WARRANTY; without even the implied warranty of
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 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 GNU General Public License for more details.
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 You should have received a copy of the GNU General Public License
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 along with Website Baker; if not, write to the Free Software
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 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
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*/
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/*
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Captcha generator
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This file generates a captcha image.
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Credits to http://php.webmaster-kit.com/ for the original code.
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*/
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require_once("../config.php");
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if(extension_loaded('gd') AND function_exists('imageCreateFromJpeg') AND isset($_SESSION['captcha'])) {
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	$image = imagecreate(120, 30);
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	$white = imagecolorallocate($image, 0xFF, 0xFF, 0xFF);
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	$gray = imagecolorallocate($image, 0xC0, 0xC0, 0xC0);
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	$darkgray = imagecolorallocate($image, 0x50, 0x50, 0x50);
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	srand((double)microtime()*1000000);
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	for($i = 0; $i < 30; $i++) {
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		$x1 = rand(0,120);
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		$y1 = rand(0,30);
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		$x2 = rand(0,120);
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		$y2 = rand(0,30);
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		imageline($image, $x1, $y1, $x2, $y2 , $gray);  
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	}
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	for ($i = 0; $i < 5; $i++) {
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		$fnt = rand(3,5);
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		$x = $x + rand(12 , 20);
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		$y = rand(7 , 12); 
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		imagestring($image, $fnt, $x, $y, substr($_SESSION['captcha'], $i, 1), $darkgray); 
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	}
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	// start buffering for size determination
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	ob_start();
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	// add no cache headers
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	header("Expires: Mon, 1 Jan 1990 05:00:00 GMT");
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	header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
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	header("Cache-Control: no-store, no-cache, must-revalidate");
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	header("Cache-Control: post-check=0, pre-check=0", false);
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	header("Pragma: no-cache");
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	header("Content-type: image/png");
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	// Make image
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	imagepng($image);
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	// Fetch length
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	header("Content-Length: " . ob_get_length());
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	// send image and turn off buffering
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	ob_end_flush();
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	// clear memory
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	imagedestroy($image);
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}
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?>
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