CompressionUtility.php

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<?php
namespace TYPO3\CMS\Frontend\Utility;

class CompressionUtility implements \TYPO3\CMS\Core\SingletonInterface {

    protected $contentLength = 0;

    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 (0 == strncasecmp('Content-length:', $header, 15)) {
                        header('Content-length: ' . $this->contentLength);
                        break;
                    }
                }
            }
        }
        return $outputBuffer;
    }

}