<?php
/*****************************************************************************
*                          Catnip Mouse Scripts                              *
*                                                                            *
*                                                                            *
*  FILE        :  csscompress.php                                            *
*                                                                            *
*  HISTORY     :                                                             *
*  20060407 Pete Harlow v00.01.00 First write                                *
*                                                                            *
*  count - a script to compress a css file with gzip, and to generate an     *
*          etag and last-modified header according to the referenced         *
*          css file.                                                         *
*          If your css is myfile.css, set $cssfile = "myfile.css" below, and *
*          save this file as "myfile.php". In your html, refer to            *
*          "myfile.php" instead of "myfile.css".                             *
*                                                                            *
*                                                                            *
*  Copyright (C) 2006  Peter Harlow                                          *
*                                                                            *
*  This program is free software; you can redistribute it and/or modify      *
*  it under the terms of the GNU General Public License as published by      *
*  the Free Software Foundation; either version 2 of the License, or         *
*  (at your option) any later version.                                       *
*                                                                            *
*  This program is distributed in the hope that it will be useful,           *
*  but WITHOUT ANY WARRANTY; without even the implied warranty of            *
*  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the             *
*  GNU General Public License for more details.                              *
*                                                                            *
*  You should have received a copy of the GNU General Public License         *
*  along with this program; if not, write to the Free Software               *
*  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA *
*                                                                            *
*****************************************************************************/


$cssfile = "myfile.css";

$do304  =  TRUE; // to enable error 304 generation

$fileupdate = filemtime($cssfile);

$thetag = sprintf("%x-%x-%x", fileinode($cssfile), filesize($cssfile), $fileupdate);
$thestag = '"' . $thetag . '"';

$filedatestring = gmdate("D, d M Y H:i:s T", $fileupdate);

header("Content-Type: text/css; charset: utf-8");

if (isset($HTTP_SERVER_VARS["HTTP_IF_NONE_MATCH"]) && $do304) // Check ETag
{
  if (!(strpos(($HTTP_SERVER_VARS["HTTP_IF_NONE_MATCH"]), $thetag ) === FALSE))
  {
    $sendpage = FALSE;
    header("HTTP/1.1 304 Not Modified");
    header('ETag: ' . $thestag);
  }
  else
  {
    header('ETag: ' . $thestag);
    header("Last-Modified: " . $filedatestring);
    $sendpage = TRUE;
  }
}
elseif (isset($HTTP_SERVER_VARS["HTTP_IF_MODIFIED_SINCE"]) && $do304)
{
  if ((strtotime ($HTTP_SERVER_VARS["HTTP_IF_MODIFIED_SINCE"])) >=  $fileupdate)
  {
    $sendpage = FALSE;
    header("HTTP/1.1 304 Not Modified");
    header('ETag: ' . $thestag);
  }
  else
  {
    header('ETag: ' . $thestag);
    header("Last-Modified: " . $filedatestring);
    $sendpage = TRUE;
  }
}
else
{
  header('ETag: ' . $thestag);
  header("Last-Modified: " . $filedatestring);
  $sendpage = TRUE;
}

if ($sendpage)
{
  ob_start("ob_gzhandler");
  include ($cssfile);
  ob_end_flush();
}
else
{
  echo "\n\n";
}

?>