filter/tex/texed.php

   1 <?PHP // $Id$
   2       // This function fetches math. images from the data directory
   3       // If not, it obtains the corresponding TeX expression from the cache_tex db table
   4       // and uses mimeTeX to create the image file
   5
   6     $nomoodlecookie = true;     // Because it interferes with caching
   7
   8     require_once("../../config.php");
   9
  10     $CFG->texfilterdir = "filter/tex";
  11     $CFG->teximagedir = "filter/tex";
  12
  13     error_reporting(E_ALL);
  14     $texexp = urldecode($_SERVER['QUERY_STRING']);
  15     $texexp = str_replace('formdata=','',$texexp);
  16
  17     if ($texexp) {
  18         //$texexp = stripslashes($texexp);
  19         $lifetime = 86400;
  20         $image  = md5($texexp) . ".gif";
  21         $filetype = 'image/gif';
  22         if (!file_exists("$CFG->dataroot/$CFG->teximagedir")) {
  23             make_upload_directory($CFG->teximagedir);
  24         }
  25         $pathname = "$CFG->dataroot/$CFG->teximagedir/$image";
  26         switch (PHP_OS) {
  27             case "Linux":
  28                 system("$CFG->dirroot/$CFG->texfilterdir/mimetex.linux -e $pathname -- ". escapeshellarg($texexp) );
  29             break;
  30             case "WINNT":
  31                 case "WIN32":
  32                 case "Windows":
  33                 $texexp = str_replace('"','\"',$texexp);
  34             system("$CFG->dirroot/$CFG->texfilterdir/mimetex.exe -e  $pathname -- \"$texexp\"");
  35             break;
  36             case "Darwin":
  37                 system("$CFG->dirroot/$CFG->texfilterdir/mimetex.darwin -e $pathname -- ". escapeshellarg($texexp) );
  38             break;
  39         }
  40         if (file_exists($pathname)) {
  41             $lastmodified = filemtime($pathname);
  42             header("Last-Modified: " . gmdate("D, d M Y H:i:s", $lastmodified) . " GMT");
  43             header("Expires: " . gmdate("D, d M Y H:i:s", time() + $lifetime) . " GMT");
  44             header("Cache-control: max_age = $lifetime"); // a day
  45             header("Pragma: ");
  46             header("Content-disposition: inline; filename=$image");
  47             header("Content-length: ".filesize($pathname));
  48             header("Content-type: $filetype");
  49             readfile("$pathname");
  50         } else {
  51             echo "Image not found!";
  52         }
  53         exit;
  54     }
  55
  56 ?>
  57
  58 <html>
  59 <head><title>mimeTeX Previewer</title></head>
  60 <body>
  61     <p>Now enter your own expression or use the sample provided,
  62      press the Submit button, and mimeTeX's rendering should be
  63      displayed in the little window immediately below it.
  64        <center>
  65           <form action="texed.php" method="get"
  66            target="inlineframe">
  67              <input type="text" name="formdata" size="50"
  68                     value="\Large f(x)=\Bigint_{-\infty}^x~e^{-t^2}dt">
  69              <input type="submit">
  70           </form> <br /> <br />
  71           <iframe name="inlineframe" align="middle" width="80%" height="100">
  72           &lt;p&gt;Something is wrong...&lt;/p&gt;
  73           </iframe>
  74        </center> <br />
  75 </body>
  76 </html>