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  1. <?php
  2. /*
  3. * img2txt image to text converter
  4. * Copyright (c) 2008 Benjamin C. Wiley Sittler <bsittler@gmail.com>
  5. *
  6. * This file is a Php port of "src/img2txt.c"
  7. * which is:
  8. * Copyright (c) 2006 Sam Hocevar <sam@zoy.org>
  9. * 2007 Jean-Yves Lamoureux <jylam@lnxscene.org>
  10. * All Rights Reserved
  11. *
  12. * $Id$
  13. *
  14. * This program is free software. It comes without any warranty, to
  15. * the extent permitted by applicable law. You can redistribute it
  16. * and/or modify it under the terms of the Do What The Fuck You Want
  17. * To Public License, Version 2, as published by Sam Hocevar. See
  18. * http://sam.zoy.org/wtfpl/COPYING for more details.
  19. */
  20. $img2txt_php = isset($_SERVER['SCRIPT_NAME'])
  21. ?
  22. $_SERVER['SCRIPT_NAME']
  23. :
  24. 'img2txt.php';
  25. $argv = array(basename($img2txt_php));
  26. $file = isset($_FILES['file']) ? $_FILES['file']['tmp_name'] : NULL;
  27. $filename = isset($_FILES['file']) ? $_FILES['file']['name'] : NULL;
  28. $args = NULL;
  29. if(isset($_REQUEST['args']))
  30. {
  31. $args = trim($_REQUEST['args']);
  32. if(strlen($args))
  33. {
  34. foreach(explode(' ', $args) as $arg)
  35. {
  36. $argv[] = $arg;
  37. }
  38. }
  39. }
  40. $argc = count($argv);
  41. $stderr = '';
  42. $stdout = '';
  43. class MygetoptException extends Exception
  44. {
  45. }
  46. $myoptind = 0;
  47. function mygetopt($shortopts, $longopts)
  48. {
  49. global $argc, $argv, $myoptind;
  50. if($myoptind < 0)
  51. {
  52. $myoptind = 0;
  53. }
  54. if(($myoptind + 1) >= $argc)
  55. {
  56. return NULL;
  57. }
  58. $myoptind ++;
  59. $nextarg = $argv[$myoptind];
  60. $ret = NULL;
  61. if((substr($nextarg, 0, 1) != '-')
  62. ||
  63. ($nextarg == '-'))
  64. {
  65. $myoptind = $argc - 1;
  66. }
  67. else
  68. {
  69. $skipopt = $myoptind;
  70. $skipopts = 1;
  71. if($nextarg == '--')
  72. {
  73. $myoptind = $argc - 1;
  74. }
  75. else
  76. {
  77. $opt = NULL;
  78. $arg = NULL;
  79. foreach($longopts as $longopt)
  80. {
  81. $optional = false;
  82. $hasarg = false;
  83. if(($longopt != '::') && substr($longopt, -2) == '::')
  84. {
  85. $optional = true;
  86. $hasarg = true;
  87. $longopt = substr($longopt, 0, -2);
  88. }
  89. else if(($longopt != ':') && substr($longopt, -1) == ':')
  90. {
  91. $optional = false;
  92. $hasarg = true;
  93. $longopt = substr($longopt, 0, -1);
  94. }
  95. if($nextarg == ('--' . $longopt))
  96. {
  97. $opt = '--' . $longopt;
  98. if($hasarg && ! $optional)
  99. {
  100. if(($myoptind + 1) < $argc)
  101. {
  102. $myoptind ++;
  103. $skipopts ++;
  104. $arg = $argv[$myoptind];
  105. }
  106. else
  107. {
  108. throw new MygetoptException("option \"$opt\" requires an argument");
  109. }
  110. }
  111. break;
  112. }
  113. else if(substr($nextarg, 0, strlen('--' . $longopt . '='))
  114. ==
  115. ('--' . $longopt . '='))
  116. {
  117. $opt = '--' . $longopt;
  118. $arg = substr($nextarg, strlen($opt . '='));
  119. if(! $hasarg)
  120. {
  121. throw new MygetoptException("option \"$opt\" does not allow an argument");
  122. }
  123. break;
  124. }
  125. }
  126. if($opt === NULL)
  127. {
  128. for($i = 0; $i < strlen($shortopts); $i ++)
  129. {
  130. $optional = false;
  131. $hasarg = false;
  132. $shortopt = substr($shortopts, $i, 1);
  133. if(substr($shortopts, $i + 1, 2) == '::')
  134. {
  135. $optional = true;
  136. $hasarg = true;
  137. $i += 2;
  138. }
  139. else if(substr($shortopts, $i + 1, 1) == ':')
  140. {
  141. $hasarg = true;
  142. }
  143. if($nextarg
  144. ==
  145. ('-' . $shortopt))
  146. {
  147. $opt = '-' . $shortopt;
  148. if($hasarg && ! $optional)
  149. {
  150. if(($myoptind + 1) < $argc)
  151. {
  152. $myoptind ++;
  153. $skipopts ++;
  154. $arg = $argv[$myoptind];
  155. }
  156. else
  157. {
  158. throw new MygetoptException("option \"$opt\" requires an argument");
  159. }
  160. }
  161. break;
  162. }
  163. else if(substr($nextarg, 0, strlen('-' . $shortopt))
  164. ==
  165. ('-' . $shortopt))
  166. {
  167. $opt = '-' . $shortopt;
  168. if($hasarg)
  169. {
  170. $arg = substr($nextarg, strlen($opt));
  171. }
  172. else
  173. {
  174. $argv[$myoptind] = '-' . substr($nextarg, strlen($opt));
  175. $myoptind --;
  176. $skipopts = 0;
  177. }
  178. }
  179. }
  180. }
  181. if($opt === NULL)
  182. {
  183. if(substr($nextarg, 0, strlen('--')) == '--')
  184. {
  185. $longopt = substr($nextarg, strlen('--'));
  186. if(strpos($longopt, '=') !== false)
  187. {
  188. $longopt = substr($longopt, 0, strpos($longopt, '='));
  189. }
  190. throw new MygetoptException("option \"--$longopt\" is not recognized");
  191. }
  192. $shortopt = substr($nextarg, strlen('-'), 1);
  193. throw new MygetoptException("option \"-$shortopt\" is not recognized");
  194. }
  195. $ret = array($opt, $arg);
  196. }
  197. if ($skipopts > 0)
  198. {
  199. for($i = 0; $i < $argc; $i ++)
  200. {
  201. if(($i < $skipopt) || ($i >= ($skipopt + $skipopts)))
  202. {
  203. $new_argv[] = $argv[$i];
  204. }
  205. }
  206. if($myoptind >= $skipopt)
  207. {
  208. $myoptind -= $skipopts;
  209. }
  210. $argv = $new_argv;
  211. $argc = count($argv);
  212. }
  213. }
  214. return $ret;
  215. }
  216. function usage($argc, $argv)
  217. {
  218. global $stdout;
  219. $stdout .= sprintf("Usage: %s [OPTIONS]... <IMAGE>\n", $argv[0]);
  220. $stdout .= sprintf("Convert IMAGE to any text based available format.\n");
  221. $stdout .= sprintf("Example : -W 80 -f html logo-caca.png\n\n", $argv[0]);
  222. $stdout .= sprintf("Options:\n");
  223. $stdout .= sprintf(" -h, --help\t\t\tThis help\n");
  224. $stdout .= sprintf(" -v, --version\t\t\tVersion of the program\n");
  225. $stdout .= sprintf(" -W, --width=WIDTH\t\tWidth of resulting image\n");
  226. $stdout .= sprintf(" -H, --height=HEIGHT\t\tHeight of resulting image\n");
  227. $stdout .= sprintf(" -x, --font-width=WIDTH\t\tWidth of output font\n");
  228. $stdout .= sprintf(" -y, --font-height=HEIGHT\t\tHeight of output font\n");
  229. $stdout .= sprintf(" -b, --brightness=BRIGHTNESS\tBrightness of resulting image\n");
  230. $stdout .= sprintf(" -c, --contrast=CONTRAST\tContrast of resulting image\n");
  231. $stdout .= sprintf(" -g, --gamma=GAMMA\t\tGamma of resulting image\n");
  232. $stdout .= sprintf(" -d, --dither=DITHER\t\tDithering algorithm to use :\n");
  233. $list = caca_get_dither_algorithm_list(caca_create_dither(imagecreate(1, 1)));
  234. foreach($list as $type => $name)
  235. {
  236. $stdout .= sprintf("\t\t\t%s: %s\n", $type, $name);
  237. }
  238. $stdout .= sprintf(" -f, --format=FORMAT\t\tFormat of the resulting image :\n");
  239. $list = caca_get_export_list();
  240. foreach($list as $type => $name)
  241. {
  242. $stdout .= sprintf("\t\t\t%s: %s\n", $type, $name);
  243. }
  244. }
  245. function version()
  246. {
  247. global $stdout;
  248. $stdout .= sprintf(
  249. "img2txt Copyright 2006-2007 Sam Hocevar and Jean-Yves Lamoureux\n" .
  250. " Copyright 2008 Benjamin C. Wiley Sittler\n" .
  251. "Internet: <sam@zoy.org> <jylam@lnxscene.org> <bsittler@gmail.com> Version: %s\n" .
  252. "\n" .
  253. "img2txt, along with its documentation, may be freely copied and distributed.\n" .
  254. "\n" .
  255. "The latest version of img2txt is available from the web site,\n" .
  256. " http://caca.zoy.org/wiki/libcaca in the libcaca package.\n" .
  257. "\n",
  258. caca_get_version());
  259. }
  260. function main()
  261. {
  262. global $file, $filename;
  263. global $argc, $argv;
  264. global $stderr;
  265. $cols = 0;
  266. $lines = 0;
  267. $font_width = 6;
  268. $font_height = 10;
  269. $format = NULL;
  270. $dither = NULL;
  271. $gamma = $brightness = $contrast = -1.0;
  272. $long_options = array(
  273. "width:" => 'W',
  274. "height:" => 'H',
  275. "font-width:" => 'x',
  276. "font-height:" => 'y',
  277. "format:" => 'f',
  278. "dither:" => 'd',
  279. "gamma:" => 'g',
  280. "brightness:" => 'b',
  281. "contrast:" => 'c',
  282. "help" => 'h',
  283. "version" => 'v'
  284. );
  285. try {
  286. while($opt_and_arg = mygetopt("W:H:f:d:g:b:c:hvx:y:", array_keys($long_options)))
  287. {
  288. $opt = $opt_and_arg[0];
  289. $arg = $opt_and_arg[1];
  290. if((substr($opt, 0, 2) == '--')
  291. &&
  292. array_key_exists(substr($opt, strlen('--')) . (($arg !== NULL) ? ':' : ''), $long_options))
  293. {
  294. $opt = '-' . $long_options[substr($opt, strlen('--')) . (($arg !== NULL) ? ':' : '')];
  295. }
  296. switch($opt)
  297. {
  298. case '-W': /* --width */
  299. $cols = intval($arg);
  300. break;
  301. case '-H': /* --height */
  302. $lines = intval($arg);
  303. break;
  304. case '-x': /* --width */
  305. $font_width = intval($arg);
  306. break;
  307. case '-y': /* --height */
  308. $font_height = intval($arg);
  309. break;
  310. case '-f': /* --format */
  311. $format = $arg;
  312. break;
  313. case '-d': /* --dither */
  314. $dither = $arg;
  315. break;
  316. case '-g': /* --gamma */
  317. $gamma = floatval($arg);
  318. break;
  319. case '-b': /* --brightness */
  320. $brightness = floatval($arg);
  321. break;
  322. case '-c': /* --contrast */
  323. $contrast = floatval($arg);
  324. break;
  325. case '-h': /* --help */
  326. usage($argc, $argv);
  327. return 0;
  328. case '-v': /* --version */
  329. version();
  330. return 0;
  331. default:
  332. return 1;
  333. }
  334. }
  335. }
  336. catch (MygetoptException $e)
  337. {
  338. $stderr .= $argv[0] . ": " . $e->getMessage() . "\n";
  339. usage($argc, $argv);
  340. return 2;
  341. }
  342. if((! $file) && ($argc == 2) && ($argv[1] == 'logo-caca.png'))
  343. {
  344. $file = 'logo-caca.png';
  345. $argc = 1;
  346. }
  347. else if($filename && $file && ($argc == 2)
  348. &&
  349. (strtolower(basename($argv[1])) == strtolower(basename($filename))))
  350. {
  351. $argc = 1;
  352. }
  353. if($argc == 2)
  354. {
  355. $stderr .= sprintf("%s: image not found\n", $argv[1]);
  356. return 1;
  357. }
  358. if($argc > 2)
  359. {
  360. $stderr .= sprintf("%s: too many arguments\n", $argv[0]);
  361. usage($argc, $argv);
  362. return 1;
  363. }
  364. if(! $file)
  365. {
  366. $stderr .= sprintf("%s: no image was provided\n", $argv[0]);
  367. usage($argc, $argv);
  368. return 1;
  369. }
  370. $cv = caca_create_canvas(0, 0);
  371. if(!$cv)
  372. {
  373. $stderr .= sprintf("%s: unable to initialise libcaca\n", $argv[0]);
  374. return 1;
  375. }
  376. $i_str = $file ? file_get_contents($file) : NULL;
  377. $i = $i_str ? imagecreatefromstring($i_str) : NULL;
  378. if(!$i)
  379. {
  380. $stderr .= sprintf("%s: unable to load %s\n", $argv[0], $filename);
  381. return 1;
  382. }
  383. /* Assume a 6×10 font */
  384. if(!$cols && !$lines)
  385. {
  386. $cols = 60;
  387. $lines = $cols * imagesy($i) * $font_width / imagesx($i) / $font_height;
  388. }
  389. else if($cols && !$lines)
  390. {
  391. $lines = $cols * imagesy($i) * $font_width / imagesx($i) / $font_height;
  392. }
  393. else if(!$cols && $lines)
  394. {
  395. $cols = $lines * imagesx($i) * $font_height / imagesy($i) / $font_width;
  396. }
  397. caca_set_canvas_size($cv, $cols, $lines);
  398. caca_set_color_ansi($cv, CACA_DEFAULT, CACA_TRANSPARENT);
  399. caca_clear_canvas($cv);
  400. $i_dither = caca_create_dither($i);
  401. if(! caca_set_dither_algorithm($i_dither, $dither?$dither:"fstein"))
  402. {
  403. $stderr .= sprintf("%s: Can't dither image with algorithm '%s'\n", $argv[0], $dither?$dither:"fstein");
  404. return -1;
  405. }
  406. if($brightness!=-1) caca_set_dither_brightness ($i_dither, $brightness);
  407. if($contrast!=-1) caca_set_dither_contrast ($i_dither, $contrast);
  408. if($gamma!=-1) caca_set_dither_gamma ($i_dither, $gamma);
  409. caca_dither_bitmap($cv, 0, 0, $cols, $lines, $i_dither, $i);
  410. $format = $format ? $format : 'html';
  411. $export = caca_export_string($cv, $format);
  412. if(!$export)
  413. {
  414. $stderr .= sprintf("%s: Can't export to format '%s'\n", $argv[0], $format);
  415. return -1;
  416. }
  417. else
  418. {
  419. $content_type_map = array(
  420. 'ansi' => 'text/plain; charset=CP437',
  421. 'utf8' => 'text/plain; charset=UTF-8',
  422. 'utf8cr' => 'text/plain; charset=UTF-8',
  423. 'html' => 'text/html; charset=UTF-8',
  424. 'html3' => 'text/html; charset=UTF-8',
  425. 'bbfr' => 'text/plain; charset=UTF-8',
  426. 'irc' => 'text/plain; charset=UTF-8',
  427. 'ps' => 'application/postscript',
  428. 'svg' => 'image/svg+xml',
  429. 'tga' => 'image/x-targa'
  430. );
  431. $download_extension_map = array(
  432. 'caca' => 'caca',
  433. 'ansi' => 'txt',
  434. 'utf8' => 'txt',
  435. 'utf8cr' => 'txt',
  436. 'irc' => 'txt',
  437. 'tga' => 'tga'
  438. );
  439. $inline_extension_map = array(
  440. 'bbfr' => 'txt',
  441. 'ps' => 'ps',
  442. 'svg' => 'svg'
  443. );
  444. if (! array_key_exists($format, $content_type_map))
  445. $content_type = 'application/octet-stream';
  446. else
  447. $content_type = $content_type_map[$format];
  448. header('Content-Type: ' . $content_type);
  449. if (array_key_exists($format, $download_extension_map))
  450. header('Content-Disposition: attachment; filename=export.' . $download_extension_map[$format]);
  451. else if (array_key_exists($format, $inline_extension_map))
  452. header('Content-Disposition: inline; filename=export.' . $inline_extension_map[$format]);
  453. echo $export;
  454. }
  455. return 0;
  456. }
  457. $ret = 1;
  458. if(isset($_REQUEST['args']) || $file)
  459. {
  460. $ret = main();
  461. }
  462. if($ret || strlen($stdout) || strlen($stderr))
  463. {
  464. header('Content-Type: text/html; charset=UTF-8');
  465. ?>
  466. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
  467. "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
  468. <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
  469. <head>
  470. <title>image to text converter</title>
  471. <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
  472. </head>
  473. <body>
  474. <form id="img2txtform" name="img2txtform" action="#" enctype="multipart/form-data" method="post">
  475. <label for="file">Image:</label>
  476. <input id="file" name="file" type="file" />
  477. <br />
  478. <label for="args">Options:</label>
  479. <input id="args" name="args" type="text" value="<?= isset($_REQUEST['args']) ? htmlspecialchars($_REQUEST['args']) : '' ?>" size="80" />
  480. <br />
  481. <input type="submit" /> <input type="reset" />
  482. </form>
  483. <?php
  484. ;
  485. if(strlen($stderr))
  486. {
  487. ?><pre xml:space="preserve"><strong><?= htmlspecialchars($stderr) ?></strong></pre><?php
  488. ;
  489. }
  490. if(strlen($stdout))
  491. {
  492. ?><pre xml:space="preserve"><?= preg_replace('!([&]lt;)([.a-zA-Z0-9]+[@])([-.a-zA-Z0-9]+)([&]gt;)!', '$1<a href="mailto:$2$3">$2...</a>$4', preg_replace('!(\s|^)(https?://[-.:_/0-9a-zA-Z%?=&;#]+)(\s|$)!', '$1<a href="$2">$2</a>$3', htmlspecialchars($stdout))) ?></pre><?php
  493. ;
  494. }
  495. ?>
  496. </body>
  497. </html>
  498. <?php
  499. ;
  500. }
  501. ?>