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diff --git a/src/libs/xpcom18a4/xpcom/ds/nsArray.h b/src/libs/xpcom18a4/xpcom/ds/nsArray.h
new file mode 100644
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+++ b/src/libs/xpcom18a4/xpcom/ds/nsArray.h
@@ -0,0 +1,118 @@
+/* -*- 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 XPCOM Array implementation.
+ *
+ * The Initial Developer of the Original Code
+ * Netscape Communications Corp.
+ * Portions created by the Initial Developer are Copyright (C) 2002
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Alec Flett <alecf@netscape.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 ***** */
+
+#ifndef nsArray_h__
+#define nsArray_h__
+
+#include "nsIArray.h"
+#include "nsCOMArray.h"
+#include "nsCOMPtr.h"
+
+#define NS_ARRAY_CLASSNAME \
+  "nsIArray implementation"
+
+// {35C66FD1-95E9-4e0a-80C5-C3BD2B375481}
+#define NS_ARRAY_CID \
+{ 0x35c66fd1, 0x95e9, 0x4e0a, \
+  { 0x80, 0xc5, 0xc3, 0xbd, 0x2b, 0x37, 0x54, 0x81 } }
+
+
+// create a new, empty array
+nsresult NS_COM
+NS_NewArray(nsIMutableArray** aResult);
+
+// The resulting array will hold an owning reference to every element
+// in the original nsCOMArray<T>. This also means that any further
+// changes to the original nsCOMArray<T> will not affect the new
+// array, and that the original array can go away and the new array
+// will still hold valid elements.
+nsresult NS_COM
+NS_NewArray(nsIMutableArray** aResult, const nsCOMArray_base& base);
+
+// adapter class to map nsIArray->nsCOMArray
+// do NOT declare this as a stack or member variable, use
+// nsCOMArray instead!
+// if you need to convert a nsCOMArray->nsIArray, see NS_NewArray above
+class nsArray : public nsIMutableArray
+{
+public:
+    nsArray() { }
+    nsArray(const nsCOMArray_base& aBaseArray) : mArray(aBaseArray)
+    { }
+    
+    NS_DECL_ISUPPORTS
+    NS_DECL_NSIARRAY
+    NS_DECL_NSIMUTABLEARRAY
+
+private:
+    ~nsArray();
+
+    nsCOMArray_base mArray;
+};
+
+
+// helper class for do_QueryElementAt
+class NS_COM nsQueryArrayElementAt : public nsCOMPtr_helper
+  {
+    public:
+      nsQueryArrayElementAt(nsIArray* aArray, PRUint32 aIndex,
+                            nsresult* aErrorPtr)
+          : mArray(aArray),
+            mIndex(aIndex),
+            mErrorPtr(aErrorPtr)
+        {
+          // nothing else to do here
+        }
+
+      virtual nsresult NS_FASTCALL operator()(const nsIID& aIID, void**) const;
+
+    private:
+      nsIArray*  mArray;
+      PRUint32   mIndex;
+      nsresult*  mErrorPtr;
+  };
+
+inline
+const nsQueryArrayElementAt
+do_QueryElementAt(nsIArray* aArray, PRUint32 aIndex, nsresult* aErrorPtr = 0)
+  {
+    return nsQueryArrayElementAt(aArray, aIndex, aErrorPtr);
+  }
+
+
+#endif