[Sommaire] [Imprimer]

   1  <?php
   2  /**

   3   * gzip_compression functions

   4   *

   5   * @package functions

   6   * @copyright Copyright 2003-2005 Zen Cart Development Team

   7   * @copyright Portions Copyright 2003 osCommerce

   8   * @license http://www.zen-cart.com/license/2_0.txt GNU Public License V2.0

   9   * @version $Id: gzip_compression.php 2618 2005-12-20 00:35:47Z drbyte $

  10   */
  11  
  12    function zen_check_gzip() {
  13      global $HTTP_ACCEPT_ENCODING;
  14  
  15      if (headers_sent() || connection_aborted()) {
  16        return false;
  17      }
  18  
  19      if (strpos($HTTP_ACCEPT_ENCODING, 'x-gzip') !== false) return 'x-gzip';
  20  
  21      if (strpos($HTTP_ACCEPT_ENCODING,'gzip') !== false) return 'gzip';
  22  
  23      return false;
  24    }
  25  
  26  /* $level = compression level 0-9, 0=none, 9=max */

  27    function zen_gzip_output($level = GZIP_LEVEL) {
  28      if ($encoding = zen_check_gzip()) {
  29        $contents = ob_get_contents();
  30        ob_end_clean();
  31  
  32        header('Content-Encoding: ' . $encoding);
  33  
  34        $size = strlen($contents);
  35        $crc = crc32($contents);
  36  
  37        $contents = gzcompress($contents, $level);
  38        $contents = substr($contents, 0, strlen($contents) - 4);
  39  
  40        echo "\x1f\x8b\x08\x00\x00\x00\x00\x00";
  41        echo $contents;
  42        echo pack('V', $crc);
  43        echo pack('V', $size);
  44      } else {
  45        ob_end_flush();
  46      }
  47    }
  48  ?>