class.tslib_fecompression.php

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<?php
/***************************************************************
*  Copyright notice
*
*  (c) 2009-2010 Dmitry Dulepov <dmitry@typo3.org>
*  All rights reserved
*
*  This script is part of the TYPO3 project. The TYPO3 project 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.
*
*  The GNU General Public License can be found at
*  http://www.gnu.org/copyleft/gpl.html.
*
*  This script 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.
*
*  This copyright notice MUST APPEAR in all copies of the script!
***************************************************************/

/**
 * This class contains compression functions for the TYPO3 Frontend. It can be
 * used only in EXT:cms/tslib/index_ts.php
 *
 * $Id: class.tslib_fecompression.php 7905 2010-06-13 14:42:33Z ohader $
 *
 * @author  Dmitry Dulepov <dmitry@typo3.org>
 * @package TYPO3
 * @subpackage  tx_cms
 */
class tslib_fecompression implements t3lib_Singleton {

    /**
     * Accumulates content length for the compressed content. It is necessary to
     * replace the Content-length HTTP header after compression if it was added
     * by TYPO3 before compression.
     *
     * @var int
     */
    protected   $contentLength = 0;

    /**
     * Corrects HTTP "Content-length" header if it was sent by TYPO3 and compression
     * is enabled.
     *
     * @param   string  $outputBuffer   Output buffer to compress
     * @param   int $mode   One of PHP_OUTPUT_HANDLER_xxx contants
     * @return  string  Compressed string
     * @see ob_start()
     * @see ob_gzhandler()
     */
    function compressionOutputHandler($outputBuffer, $mode) {
        // Compress the content
        $outputBuffer = ob_gzhandler($outputBuffer, $mode);
        if ($outputBuffer !== false) {
            // Save compressed size
            $this->contentLength += strlen($outputBuffer);

            // Check if this was the last content chunk
            if (0 != ($mode & PHP_OUTPUT_HANDLER_END)) {
                // Check if we have content-length header
                foreach (headers_list() as $header) {
                    if (0 == strncasecmp('Content-length:', $header, 15)) {
                        header('Content-length: ' . $this->contentLength);
                        break;
                    }
                }
            }
        }
        return $outputBuffer;
    }
}

if (defined('TYPO3_MODE') && $TYPO3_CONF_VARS[TYPO3_MODE]['XCLASS']['ext/cms/tslib/class.tslib_fecompression.php']) {
    include_once($TYPO3_CONF_VARS[TYPO3_MODE]['XCLASS']['ext/cms/tslib/class.tslib_fecompression.php']);
}

?>

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