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diff --git a/src/libs/xpcom18a4/xpcom/io/nsISeekableStream.idl b/src/libs/xpcom18a4/xpcom/io/nsISeekableStream.idl
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+++ b/src/libs/xpcom18a4/xpcom/io/nsISeekableStream.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 Mozilla FastLoad code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2001
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *
+ * Alternatively, the contents of this file may be used under the terms of
+ * either of 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 ***** */
+
+
+/*
+ * nsISeekableStream
+ *
+ * Note that a stream might not implement all methods (e.g., a readonly stream 
+ * won't implement setEOF)
+ * 
+ * @status UNDER_REVIEW
+ */
+
+#include "nsISupports.idl"
+
+[scriptable, uuid(8429d350-1040-4661-8b71-f2a6ba455980)]
+interface nsISeekableStream : nsISupports
+{
+    /* 
+     * Sets the stream pointer to the value of the 'offset' parameter 
+     */
+    const PRInt32 NS_SEEK_SET = 0;
+
+    /*  
+     * Sets the stream pointer to its current location plus the value 
+     * of the offset parameter. 
+     */
+    const PRInt32 NS_SEEK_CUR = 1;
+
+    /* 
+     * Sets the stream pointer to the size of the stream plus the value 
+     * of the offset parameter. 
+     */
+    const PRInt32 NS_SEEK_END = 2;
+
+    /**
+     *  seek
+     *
+     *  This method moves the stream offset of the steam implementing this
+     *  interface.
+     *
+     *   @param whence specifies how to interpret the 'offset' parameter in
+     *                 setting the stream offset associated with the implementing
+     *                 stream.
+     *     
+     *   @param offset specifies a value, in bytes, that is used in conjunction
+     *                 with the 'whence' parameter to set the stream offset of the 
+     *                 implementing stream.  A negative value causes seeking in 
+     *                 the reverse direction.
+     */
+    void seek(in long whence, in long long offset);
+
+    /**
+     *  tell
+     *
+     *  This method reports the current offset, in bytes, from the start of the 
+     *  stream. 
+     */
+    long long tell();
+
+
+    /**
+     *  setEOF
+     *
+     *  This method truncates the stream at the current offset.
+     */
+    void setEOF();
+};