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   1  <?php
   2  //

   3  // +----------------------------------------------------------------------+

   4  // |zen-cart Open Source E-commerce                                       |

   5  // +----------------------------------------------------------------------+

   6  // | Copyright (c) 2003 The zen-cart developers                           |

   7  // |                                                                      |

   8  // | http://www.zen-cart.com/index.php                                    |

   9  // |                                                                      |

  10  // | Portions Copyright (c) 2003 osCommerce                               |

  11  // +----------------------------------------------------------------------+

  12  // | This source file is subject to version 2.0 of the GPL license,       |

  13  // | that is bundled with this package in the file LICENSE, and is        |

  14  // | available through the world-wide-web at the following url:           |

  15  // | http://www.zen-cart.com/license/2_0.txt.                             |

  16  // | If you did not receive a copy of the zen-cart license and are unable |

  17  // | to obtain it through the world-wide-web, please send a note to       |

  18  // | license@zen-cart.com so we can mail you a copy immediately.          |

  19  // +----------------------------------------------------------------------+

  20  // $Id: gzip_compression.php 1969 2005-09-13 06:57:21Z drbyte $

  21  //

  22  
  23    function zen_check_gzip() {
  24  
  25      if (headers_sent() || connection_aborted()) {
  26        return false;
  27      }
  28  
  29      if (strpos($_SERVER['HTTP_ACCEPT_ENCODING'], 'x-gzip') !== false) return 'x-gzip';
  30  
  31      if (strpos($_SERVER['HTTP_ACCEPT_ENCODING'],'gzip') !== false) return 'gzip';
  32  
  33      return false;
  34    }
  35  
  36  /* $level = compression level 0-9, 0=none, 9=max */

  37    function zen_gzip_output($level = GZIP_LEVEL) {
  38      if ($encoding = zen_check_gzip()) {
  39        $contents = ob_get_contents();
  40        ob_end_clean();
  41  
  42        header('Content-Encoding: ' . $encoding);
  43  
  44        $size = strlen($contents);
  45        $crc = crc32($contents);
  46  
  47        $contents = gzcompress($contents, $level);
  48        $contents = substr($contents, 0, strlen($contents) - 4);
  49  
  50        echo "\x1f\x8b\x08\x00\x00\x00\x00\x00";
  51        echo $contents;
  52        echo pack('V', $crc);
  53        echo pack('V', $size);
  54      } else {
  55        ob_end_flush();
  56      }
  57    }
  58  ?>