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diff --git a/www/wiki/includes/export/Dump7ZipOutput.php b/www/wiki/includes/export/Dump7ZipOutput.php
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+++ b/www/wiki/includes/export/Dump7ZipOutput.php
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+<?php
+/**
+ * Sends dump output via the p7zip compressor.
+ *
+ * Copyright © 2003, 2005, 2006 Brion Vibber <brion@pobox.com>
+ * https://www.mediawiki.org/
+ *
+ * This program 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.
+ *
+ * This program 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.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ */
+
+/**
+ * @ingroup Dump
+ */
+class Dump7ZipOutput extends DumpPipeOutput {
+	/**
+	 * @var int
+	 */
+	protected $compressionLevel;
+
+	/**
+	 * @param string $file
+	 * @param int $cmpLevel Compression level passed to 7za command's -mx
+	 */
+	function __construct( $file, $cmpLevel = 4 ) {
+		$this->compressionLevel = $cmpLevel;
+		$command = $this->setup7zCommand( $file );
+		parent::__construct( $command );
+		$this->filename = $file;
+	}
+
+	/**
+	 * @param string $file
+	 * @return string
+	 */
+	function setup7zCommand( $file ) {
+		$command = "7za a -bd -si -mx=";
+		$command .= wfEscapeShellArg( $this->compressionLevel ) . ' ';
+		$command .= wfEscapeShellArg( $file );
+		// Suppress annoying useless crap from p7zip
+		// Unfortunately this could suppress real error messages too
+		$command .= ' >' . wfGetNull() . ' 2>&1';
+		return $command;
+	}
+
+	/**
+	 * @param string $newname
+	 * @param bool $open
+	 */
+	function closeAndRename( $newname, $open = false ) {
+		$newname = $this->checkRenameArgCount( $newname );
+		if ( $newname ) {
+			fclose( $this->handle );
+			proc_close( $this->procOpenResource );
+			$this->renameOrException( $newname );
+			if ( $open ) {
+				$command = $this->setup7zCommand( $this->filename );
+				$this->startCommand( $command );
+			}
+		}
+	}
+}