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comparison forum/Sources/Subs-Sound.php @ 76:e3e11437ecea website

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Add forum code
author Chris Cannam
date Sun, 07 Jul 2013 11:25:48 +0200
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75:72f59aa7e503 76:e3e11437ecea
1 <?php
2
3 /**
4 * Simple Machines Forum (SMF)
5 *
6 * @package SMF
7 * @author Simple Machines http://www.simplemachines.org
8 * @copyright 2011 Simple Machines
9 * @license http://www.simplemachines.org/about/smf/license.php BSD
10 *
11 * @version 2.0
12 */
13
14 if (!defined('SMF'))
15 die('Hacking attempt...');
16
17 /* This file handles sound processing. In order to make sure the visual
18 verification is still accessible for all users, a sound clip is being addded
19 that reads the letters that are being shown.
20
21 void createWaveFile(string word)
22 - creates a wave file that spells the letters of 'word'.
23 - Tries the user's language first, and defaults to english.
24 - Returns false on failure.
25 - used by VerificationCode() (Register.php).
26 */
27
28 function createWaveFile($word)
29 {
30 global $settings, $user_info, $context;
31
32 // Allow max 2 requests per 20 seconds.
33 if (($ip = cache_get_data('wave_file/' . $user_info['ip'], 20)) > 2 || ($ip2 = cache_get_data('wave_file/' . $user_info['ip2'], 20)) > 2)
34 die(header('HTTP/1.1 400 Bad Request'));
35 cache_put_data('wave_file/' . $user_info['ip'], $ip ? $ip + 1 : 1, 20);
36 cache_put_data('wave_file/' . $user_info['ip2'], $ip2 ? $ip2 + 1 : 1, 20);
37
38 // Fixate randomization for this word.
39 mt_srand(end(unpack('n', md5($word . session_id()))));
40
41 // Try to see if there's a sound font in the user's language.
42 if (file_exists($settings['default_theme_dir'] . '/fonts/sound/a.' . $user_info['language'] . '.wav'))
43 $sound_language = $user_info['language'];
44
45 // English should be there.
46 elseif (file_exists($settings['default_theme_dir'] . '/fonts/sound/a.english.wav'))
47 $sound_language = 'english';
48
49 // Guess not...
50 else
51 return false;
52
53 // File names are in lower case so lets make sure that we are only using a lower case string
54 $word = strtolower($word);
55
56 // Loop through all letters of the word $word.
57 $sound_word = '';
58 for ($i = 0; $i < strlen($word); $i++)
59 {
60 $sound_letter = implode('', file($settings['default_theme_dir'] . '/fonts/sound/' . $word{$i} . '.' . $sound_language . '.wav'));
61 if (strpos($sound_letter, 'data') === false)
62 return false;
63
64 $sound_letter = substr($sound_letter, strpos($sound_letter, 'data') + 8);
65 switch ($word{$i} === 's' ? 0 : mt_rand(0, 2))
66 {
67 case 0:
68 for ($j = 0, $n = strlen($sound_letter); $j < $n; $j++)
69 for ($k = 0, $m = round(mt_rand(15, 25) / 10); $k < $m; $k++)
70 $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)));
71 break;
72
73 case 1:
74 for ($j = 0, $n = strlen($sound_letter) - 1; $j < $n; $j += 2)
75 $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} : '');
76 $sound_word .= str_repeat($sound_letter{$n}, 2);
77 break;
78
79 case 2:
80 $shift = 0;
81 for ($j = 0, $n = strlen($sound_letter); $j < $n; $j++)
82 {
83 if (mt_rand(0, 10) === 0)
84 $shift += mt_rand(-3, 3);
85 for ($k = 0, $m = round(mt_rand(15, 25) / 10); $k < $m; $k++)
86 $sound_word .= chr(min(max(ord($sound_letter{$j}) + $shift, 0x00), 0xFF));
87 }
88 break;
89
90 }
91
92 $sound_word .= str_repeat(chr(0x80), mt_rand(10000, 10500));
93 }
94
95 $data_size = strlen($sound_word);
96 $file_size = $data_size + 0x24;
97 $sample_rate = 16000;
98
99 // Disable compression.
100 ob_end_clean();
101 header('Content-Encoding: none');
102
103 // Output the wav.
104 header('Content-type: audio/x-wav');
105 header('Expires: ' . gmdate('D, d M Y H:i:s', time() + 525600 * 60) . ' GMT');
106 header('Content-Length: ' . ($file_size + 0x08));
107
108 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;
109
110 // Noting more to add.
111 die();
112 }
113
114 ?>