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typo3/sysext/frontend/Classes/Utility/CompressionUtility.php

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+<?php
+namespace TYPO3\CMS\Frontend\Utility;
+
+/*
+ * 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!
+ */
+
+/**
+ * This class contains compression functions for the TYPO3 Frontend. It can be
+ * used only in EXT:frontend/Classes/Http/RequestHandler.php
+ *
+ * @internal this is a internal TYPO3 implementation and solely used for EXT:frontend and not part of TYPO3's Core API.
+ */
+class CompressionUtility implements \TYPO3\CMS\Core\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 (0 == strncasecmp('Content-length:', $header, 15)) {
+                        header('Content-length: ' . $this->contentLength);
+                        break;
+                    }
+                }
+            }
+        }
+        return $outputBuffer;
+    }
+}