50 lines
1.1 KiB
PHP
50 lines
1.1 KiB
PHP
<?php
|
|
/*
|
|
$Id: gzip_compression.php,v 1.3 2003/02/11 01:31:02 hpdl Exp $
|
|
|
|
osCommerce, Open Source E-Commerce Solutions
|
|
http://www.oscommerce.com
|
|
|
|
Copyright (c) 2003 osCommerce
|
|
|
|
Released under the GNU General Public License
|
|
*/
|
|
|
|
function tep_check_gzip() {
|
|
global $HTTP_ACCEPT_ENCODING;
|
|
|
|
if (headers_sent() || connection_aborted()) {
|
|
return false;
|
|
}
|
|
|
|
if (strpos($HTTP_ACCEPT_ENCODING, 'x-gzip') !== false) return 'x-gzip';
|
|
|
|
if (strpos($HTTP_ACCEPT_ENCODING,'gzip') !== false) return 'gzip';
|
|
|
|
return false;
|
|
}
|
|
|
|
/* $level = compression level 0-9, 0=none, 9=max */
|
|
function tep_gzip_output($level = 5) {
|
|
if ($encoding = tep_check_gzip()) {
|
|
$contents = ob_get_contents();
|
|
ob_end_clean();
|
|
|
|
header('Content-Encoding: ' . $encoding);
|
|
|
|
$size = strlen($contents);
|
|
$crc = crc32($contents);
|
|
|
|
$contents = gzcompress($contents, $level);
|
|
$contents = substr($contents, 0, strlen($contents) - 4);
|
|
|
|
echo "\x1f\x8b\x08\x00\x00\x00\x00\x00";
|
|
echo $contents;
|
|
echo pack('V', $crc);
|
|
echo pack('V', $size);
|
|
} else {
|
|
ob_end_flush();
|
|
}
|
|
}
|
|
?>
|