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