phpmyadmin/libraries/mime.lib.php

   1 <?php
   2 /* vim: set expandtab sw=4 ts=4 sts=4: */
   3 /**
   4  * MIME detection code.
   5  *
   6  * @package PhpMyAdmin
   7  * @todo Maybe we could try to use fileinfo module if loaded
   8  */
   9 if (! defined('PHPMYADMIN')) {
  10     exit;
  11 }
  12
  13 /**
  14  * Tries to detect MIME type of content.
  15  *
  16  * @param string &$test First few bytes of content to use for detection
  17  *
  18  * @return string
  19  */
  20 function PMA_detectMIME(&$test)
  21 {
  22     $len = /*overload*/mb_strlen($test);
  23     if ($len >= 2 && $test[0] == chr(0xff) && $test[1] == chr(0xd8)) {
  24         return 'image/jpeg';
  25     }
  26     if ($len >= 3 && substr($test, 0, 3) == 'GIF') {
  27         return 'image/gif';
  28     }
  29     if ($len >= 4 && /*overload*/mb_substr($test, 0, 4) == "\x89PNG") {
  30         return 'image/png';
  31     }
  32     return 'application/octet-stream';
  33 }