libraries/classes/Mime.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 declare(strict_types=1);
  10
  11 namespace PhpMyAdmin;
  12
  13 /**
  14  * PhpMyAdmin\Mime class;
  15  *
  16  * @package PhpMyAdmin
  17  */
  18 class Mime
  19 {
  20     /**
  21      * Tries to detect MIME type of content.
  22      *
  23      * @param string $test First few bytes of content to use for detection
  24      *
  25      * @return string
  26      */
  27     public static function detect(&$test)
  28     {
  29         $len = mb_strlen($test);
  30         if ($len >= 2 && $test[0] == chr(0xff) && $test[1] == chr(0xd8)) {
  31             return 'image/jpeg';
  32         }
  33         if ($len >= 3 && substr($test, 0, 3) == 'GIF') {
  34             return 'image/gif';
  35         }
  36         if ($len >= 4 && mb_substr($test, 0, 4) == "\x89PNG") {
  37             return 'image/png';
  38         }
  39         return 'application/octet-stream';
  40     }
  41 }