Chris@76: <?php
Chris@76: 
Chris@76: /**
Chris@76:  * Simple Machines Forum (SMF)
Chris@76:  *
Chris@76:  * @package SMF
Chris@76:  * @author Simple Machines http://www.simplemachines.org
Chris@76:  * @copyright 2011 Simple Machines
Chris@76:  * @license http://www.simplemachines.org/about/smf/license.php BSD
Chris@76:  *
Chris@76:  * @version 2.0
Chris@76:  */
Chris@76: 
Chris@76: if (!defined('SMF'))
Chris@76: 	die('Hacking attempt...');
Chris@76: 
Chris@76: /*	This file handles sound processing. In order to make sure the visual
Chris@76: 	verification is still accessible for all users, a sound clip is being addded
Chris@76: 	that reads the letters that are being shown.
Chris@76: 
Chris@76: 	void createWaveFile(string word)
Chris@76: 		- creates a wave file that spells the letters of 'word'.
Chris@76: 		- Tries the user's language first, and defaults to english.
Chris@76: 		- Returns false on failure.
Chris@76: 		- used by VerificationCode() (Register.php).
Chris@76: */
Chris@76: 
Chris@76: function createWaveFile($word)
Chris@76: {
Chris@76: 	global $settings, $user_info, $context;
Chris@76: 
Chris@76: 	// Allow max 2 requests per 20 seconds.
Chris@76: 	if (($ip = cache_get_data('wave_file/' . $user_info['ip'], 20)) > 2 || ($ip2 = cache_get_data('wave_file/' . $user_info['ip2'], 20)) > 2)
Chris@76: 		die(header('HTTP/1.1 400 Bad Request'));
Chris@76: 	cache_put_data('wave_file/' . $user_info['ip'], $ip ? $ip + 1 : 1, 20);
Chris@76: 	cache_put_data('wave_file/' . $user_info['ip2'], $ip2 ? $ip2 + 1 : 1, 20);
Chris@76: 
Chris@76: 	// Fixate randomization for this word.
Chris@76: 	mt_srand(end(unpack('n', md5($word . session_id()))));
Chris@76: 
Chris@76: 	// Try to see if there's a sound font in the user's language.
Chris@76: 	if (file_exists($settings['default_theme_dir'] . '/fonts/sound/a.' . $user_info['language'] . '.wav'))
Chris@76: 		$sound_language = $user_info['language'];
Chris@76: 
Chris@76: 	// English should be there.
Chris@76: 	elseif (file_exists($settings['default_theme_dir'] . '/fonts/sound/a.english.wav'))
Chris@76: 		$sound_language = 'english';
Chris@76: 
Chris@76: 	// Guess not...
Chris@76: 	else
Chris@76: 		return false;
Chris@76: 
Chris@76: 	// File names are in lower case so lets make sure that we are only using a lower case string
Chris@76: 	$word = strtolower($word);
Chris@76: 
Chris@76: 	// Loop through all letters of the word $word.
Chris@76: 	$sound_word = '';
Chris@76: 	for ($i = 0; $i < strlen($word); $i++)
Chris@76: 	{
Chris@76: 		$sound_letter = implode('', file($settings['default_theme_dir'] . '/fonts/sound/' . $word{$i} . '.' . $sound_language . '.wav'));
Chris@76: 		if (strpos($sound_letter, 'data') === false)
Chris@76: 			return false;
Chris@76: 
Chris@76: 		$sound_letter = substr($sound_letter, strpos($sound_letter, 'data') + 8);
Chris@76: 		switch ($word{$i} === 's' ? 0 : mt_rand(0, 2))
Chris@76: 		{
Chris@76: 			case 0:
Chris@76: 				for ($j = 0, $n = strlen($sound_letter); $j < $n; $j++)
Chris@76: 					for ($k = 0, $m = round(mt_rand(15, 25) / 10); $k < $m; $k++)
Chris@76: 						$sound_word .= $word{$i} === 's' ? $sound_letter{$j} : chr(mt_rand(max(ord($sound_letter{$j}) - 1, 0x00), min(ord($sound_letter{$j}) + 1, 0xFF)));
Chris@76: 			break;
Chris@76: 
Chris@76: 			case 1:
Chris@76: 				for ($j = 0, $n = strlen($sound_letter) - 1; $j < $n; $j += 2)
Chris@76: 					$sound_word .= (mt_rand(0, 3) == 0 ? '' : $sound_letter{$j}) . (mt_rand(0, 3) === 0 ? $sound_letter{$j + 1} : $sound_letter{$j}) . (mt_rand(0, 3) === 0 ? $sound_letter{$j} : $sound_letter{$j + 1}) . $sound_letter{$j + 1} . (mt_rand(0, 3) == 0 ? $sound_letter{$j + 1} : '');
Chris@76: 				$sound_word .= str_repeat($sound_letter{$n}, 2);
Chris@76: 			break;
Chris@76: 
Chris@76: 			case 2:
Chris@76: 				$shift = 0;
Chris@76: 				for ($j = 0, $n = strlen($sound_letter); $j < $n; $j++)
Chris@76: 				{
Chris@76: 					if (mt_rand(0, 10) === 0)
Chris@76: 						$shift += mt_rand(-3, 3);
Chris@76: 					for ($k = 0, $m = round(mt_rand(15, 25) / 10); $k < $m; $k++)
Chris@76: 						$sound_word .= chr(min(max(ord($sound_letter{$j}) + $shift, 0x00), 0xFF));
Chris@76: 				}
Chris@76: 			break;
Chris@76: 
Chris@76: 		}
Chris@76: 
Chris@76: 		$sound_word .= str_repeat(chr(0x80), mt_rand(10000, 10500));
Chris@76: 	}
Chris@76: 
Chris@76: 	$data_size = strlen($sound_word);
Chris@76: 	$file_size = $data_size + 0x24;
Chris@76: 	$sample_rate = 16000;
Chris@76: 
Chris@76: 	// Disable compression.
Chris@76: 	ob_end_clean();
Chris@76: 	header('Content-Encoding: none');
Chris@76: 
Chris@76: 	// Output the wav.
Chris@76: 	header('Content-type: audio/x-wav');
Chris@76: 	header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 525600 * 60) . ' GMT');
Chris@76: 	header('Content-Length: ' . ($file_size + 0x08));
Chris@76: 
Chris@76: 	echo pack('nnVnnnnnnnnVVnnnnV', 0x5249, 0x4646, $file_size, 0x5741, 0x5645, 0x666D, 0x7420, 0x1000, 0x0000, 0x0100, 0x0100, $sample_rate, $sample_rate, 0x0100, 0x0800, 0x6461, 0x7461, $data_size), $sound_word;
Chris@76: 
Chris@76: 	// Noting more to add.
Chris@76: 	die();
Chris@76: }
Chris@76: 
Chris@76: ?>