mirror of
https://gitlab.com/harald.mueller/aktuelle.kurse.git
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107 lines
4.0 KiB
PHP
107 lines
4.0 KiB
PHP
<?php
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//
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// +----------------------------------------------------------------------+
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// | PHP Version 4 |
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// +----------------------------------------------------------------------+
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// | Copyright (c) 1997-2002 The PHP Group |
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// +----------------------------------------------------------------------+
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// | This source file is subject to version 2.02 of the PHP license, |
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// | that is bundled with this package in the file LICENSE, and is |
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// | available at through the world-wide-web at |
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// | http://www.php.net/license/2_02.txt. |
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// | If you did not receive a copy of the PHP license and are unable to |
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// | obtain it through the world-wide-web, please send a note to |
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// | license@php.net so we can mail you a copy immediately. |
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// +----------------------------------------------------------------------+
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// | Authors: Mark Nottingham <mnot@pobox.com> |
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// | Chuck Hagenbuch <chuck@horde.org> |
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// +----------------------------------------------------------------------+
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//
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// $Id: Compress.php,v 1.4 2001/12/11 15:31:28 sebastian Exp $
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//
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/**
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* HTTP_Compress:: provides a wrapper around php's output buffering
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* mechanisms and also does compression, generates headers - ETag,
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* Content-Length, etc. - which may be beneficial to bandwidth
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* usage and performance.
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*
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* @author Mark Nottingham <mnot@pobox.com>
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* @author Chuck Hagenbuch <chuck@horde.org>
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* @version $Revision: 1.4 $
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* @package HTTP
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*/
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class HTTP_Compress {
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/**
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* Start the output buffer, and make sure that implicit flush is
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* off so that data is always buffered.
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* @access public
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*/
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function start()
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{
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ob_start();
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ob_implicit_flush(0);
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}
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/**
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* Output the contents of the output buffer, compressed if
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* desired, along with any relevant headers.
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*
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* @param boolean $compress (optional) Use gzip compression, if the browser supports it.
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* @param boolean $use_etag Generate an ETag, and don't send the body if the browser has the same object cached.
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* @param boolean $send_body Send the body of the request? Might be false for HEAD requests.
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* @access public
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*/
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function output($compress = true, $use_etag = true, $send_body = true)
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{
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$min_gz_size = 1024;
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$page = ob_get_contents();
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$length = strlen($page);
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ob_end_clean();
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if ($compress && extension_loaded('zlib') && (strlen($page) > $min_gz_size) && isset($GLOBALS['HTTP_SERVER_VARS']['HTTP_ACCEPT_ENCODING'])) {
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$ae = explode(',', str_replace(' ', '', $GLOBALS['HTTP_SERVER_VARS']['HTTP_ACCEPT_ENCODING']));
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$enc = false;
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if (in_array('gzip', $ae)) {
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$enc = 'gzip';
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} else if (in_array('x-gzip', $ae)) {
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$enc = 'x-gzip';
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}
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if ($enc) {
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$page = gzencode($page);
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$length = strlen($page);
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header('Content-Encoding: ' . $enc);
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header('Vary: Accept-Encoding');
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} else {
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$compress = false;
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}
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} else {
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$compress = false;
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}
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if ($use_etag) {
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$etag = '"' . md5($page) . '"';
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header('ETag: ' . $etag);
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if (isset($GLOBALS['HTTP_SERVER_VARS']['HTTP_IF_NONE_MATCH'])) {
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$inm = explode(',', $GLOBALS['HTTP_SERVER_VARS']['HTTP_IF_NONE_MATCH']);
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foreach ($inm as $i) {
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if (trim($i) == $etag) {
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header('HTTP/1.0 304 Not Modified');
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$send_body = false;
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break;
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}
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}
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}
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}
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if ($send_body) {
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header('Content-Length: ' . $length);
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echo $page;
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}
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}
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}
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?>
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