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<?php
/*
* This file is part of the TYPO3 CMS project.
*
* It is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, either version 2
* of the License, or any later version.
*
* For the full copyright and license information, please read the
* LICENSE.txt file that was distributed with this source code.
*
* The TYPO3 project - inspiring people to share!
*/
namespace TYPO3\CMS\Frontend\Utility;
use TYPO3\CMS\Core\SingletonInterface;
/**
* This class contains compression functions for the TYPO3 Frontend. It can be
* used only in EXT:frontend/Classes/Http/RequestHandler.php
*
* @internal this is an internal TYPO3 implementation and solely used for EXT:frontend and not part of TYPO3's Core API.
*/
class CompressionUtility implements SingletonInterface
{
/**
* 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 $mode One of PHP_OUTPUT_HANDLER_xxx constants
* @return string Compressed string
* @see ob_start()
* @see ob_gzhandler()
*/
public function compressionOutputHandler($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 (strncasecmp('Content-length:', $header, 15) == 0) {
header('Content-length: ' . $this->contentLength);
break;
}
}
}
}
return $outputBuffer;
}
}