[Sommaire] [Imprimer]

   1  <?php
   2  /*
   3    $Id: gzip_compression.php,v 1.3 2003/02/11 01:31:02 hpdl Exp $
   4  
   5    osCommerce, Open Source E-Commerce Solutions
   6    http://www.oscommerce.com
   7  
   8    Copyright (c) 2003 osCommerce
   9  
  10    Released under the GNU General Public License
  11  */
  12  
  13    function tep_check_gzip() {
  14      global $HTTP_ACCEPT_ENCODING;
  15  
  16      if (headers_sent() || connection_aborted()) {
  17        return false;
  18      }
  19  
  20      if (strpos($HTTP_ACCEPT_ENCODING, 'x-gzip') !== false) return 'x-gzip';
  21  
  22      if (strpos($HTTP_ACCEPT_ENCODING,'gzip') !== false) return 'gzip';
  23  
  24      return false;
  25    }
  26  
  27  /* $level = compression level 0-9, 0=none, 9=max */
  28    function tep_gzip_output($level = 5) {
  29      if ($encoding = tep_check_gzip()) {
  30        $contents = ob_get_contents();
  31        ob_end_clean();
  32  
  33        header('Content-Encoding: ' . $encoding);
  34  
  35        $size = strlen($contents);
  36        $crc = crc32($contents);
  37  
  38        $contents = gzcompress($contents, $level);
  39        $contents = substr($contents, 0, strlen($contents) - 4);
  40  
  41        echo "\x1f\x8b\x08\x00\x00\x00\x00\x00";
  42        echo $contents;
  43        echo pack('V', $crc);
  44        echo pack('V', $size);
  45      } else {
  46        ob_end_flush();
  47      }
  48    }
  49  ?>