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diff --git a/src/libs/xpcom18a4/xpcom/io/nsIMultiplexInputStream.idl b/src/libs/xpcom18a4/xpcom/io/nsIMultiplexInputStream.idl
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* ***** BEGIN LICENSE BLOCK *****
+ * Version: MPL 1.1/GPL 2.0/LGPL 2.1
+ *
+ * The contents of this file are subject to the Mozilla Public License Version
+ * 1.1 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ * http://www.mozilla.org/MPL/
+ *
+ * Software distributed under the License is distributed on an "AS IS" basis,
+ * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+ * for the specific language governing rights and limitations under the
+ * License.
+ *
+ * The Original Code is frightening to behold.
+ *
+ * The Initial Developer of the Original Code is
+ * Jonas Sicking.
+ * Portions created by the Initial Developer are Copyright (C) 2001
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Jonas Sicking <sicking@bigfoot.com>
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either the GNU General Public License Version 2 or later (the "GPL"), or
+ * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+ * in which case the provisions of the GPL or the LGPL are applicable instead
+ * of those above. If you wish to allow use of your version of this file only
+ * under the terms of either the GPL or the LGPL, and not to allow others to
+ * use your version of this file under the terms of the MPL, indicate your
+ * decision by deleting the provisions above and replace them with the notice
+ * and other provisions required by the GPL or the LGPL. If you do not delete
+ * the provisions above, a recipient may use your version of this file under
+ * the terms of any one of the MPL, the GPL or the LGPL.
+ *
+ * ***** END LICENSE BLOCK ***** */
+
+#include "nsIInputStream.idl"
+
+/**
+ * The multiplex stream concatinates a list of input streams into a single
+ * stream.
+ */
+
+[scriptable, uuid(a076fd12-1dd1-11b2-b19a-d53b5dffaade)]
+interface nsIMultiplexInputStream : nsIInputStream
+{
+    /**
+     * Number of streams in this multiplex-stream
+     */
+    readonly attribute unsigned long count;
+
+    /**
+     * Appends a stream to the end of the streams. The cursor of the stream
+     * should be located at the beginning of the stream if the implementation
+     * of this nsIMultiplexInputStream also is used as an nsISeekableStream.
+     * @param stream  stream to append
+     */
+    void appendStream(in nsIInputStream stream);
+
+    /**
+     * Insert a stream at specified index.  If the cursor of this stream is at
+     * the beginning of the stream at index, the cursor will be placed at the
+     * beginning of the inserted stream instead.
+     * The cursor of the new stream should be located at the beginning of the
+     * stream if the implementation of this nsIMultiplexInputStream also is
+     * used as an nsISeekableStream.
+     * @param stream  stream to insert
+     * @param index   index to insert stream at, must be <= count
+     */
+    void insertStream(in nsIInputStream stream, in unsigned long index);
+
+    /**
+     * Remove stream at specified index. If this stream is the one currently
+     * being read the readcursor is moved to the beginning of the next
+     * stream
+     * @param index   remove stream at this index, must be < count
+     */
+    void removeStream(in unsigned long index);
+
+    /**
+     * Get stream at specified index.
+     * @param index   return stream at this index, must be < count
+     * @return        stream at specified index
+     */
+    nsIInputStream getStream(in unsigned long index);
+};