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diff --git a/src/libs/xpcom18a4/xpcom/ds/nsSupportsArray.h b/src/libs/xpcom18a4/xpcom/ds/nsSupportsArray.h
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+++ b/src/libs/xpcom18a4/xpcom/ds/nsSupportsArray.h
@@ -0,0 +1,172 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* ***** 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.org code.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 1998
+ * 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 ***** */
+
+#ifndef nsSupportsArray_h__
+#define nsSupportsArray_h__
+
+//#define DEBUG_SUPPORTSARRAY 1
+
+#include "nsISupportsArray.h"
+
+static const PRUint32 kAutoArraySize = 8;
+
+#undef  IMETHOD_VISIBILITY
+#define IMETHOD_VISIBILITY NS_VISIBILITY_DEFAULT
+
+class NS_COM nsSupportsArray : public nsISupportsArray {
+public:
+  nsSupportsArray(void);
+  ~nsSupportsArray(void); // nonvirtual since we're not subclassed
+
+  static NS_METHOD
+  Create(nsISupports *aOuter, REFNSIID aIID, void **aResult);
+
+  NS_DECL_ISUPPORTS
+
+  NS_DECL_NSISERIALIZABLE
+
+  // nsICollection methods:
+  NS_IMETHOD Count(PRUint32 *result) { *result = mCount; return NS_OK; }
+  NS_IMETHOD GetElementAt(PRUint32 aIndex, nsISupports* *result) {
+    *result = ElementAt(aIndex);
+    return NS_OK;
+  }
+  NS_IMETHOD QueryElementAt(PRUint32 aIndex, const nsIID & aIID, void * *aResult) {
+    if (aIndex < mCount) {
+      nsISupports* element = mArray[aIndex];
+      if (nsnull != element)
+        return element->QueryInterface(aIID, aResult);
+    }
+    return NS_ERROR_FAILURE;
+  }
+  NS_IMETHOD SetElementAt(PRUint32 aIndex, nsISupports* value) {
+    return ReplaceElementAt(value, aIndex) ? NS_OK : NS_ERROR_FAILURE;
+  }
+  NS_IMETHOD AppendElement(nsISupports *aElement) {
+    return InsertElementAt(aElement, mCount)/* ? NS_OK : NS_ERROR_FAILURE*/;
+  }
+  // XXX this is badly named - should be RemoveFirstElement
+  NS_IMETHOD RemoveElement(nsISupports *aElement) {
+    return RemoveElement(aElement, 0)/* ? NS_OK : NS_ERROR_FAILURE*/;
+  }
+  NS_IMETHOD_(PRBool) MoveElement(PRInt32 aFrom, PRInt32 aTo);
+  NS_IMETHOD Enumerate(nsIEnumerator* *result);
+  NS_IMETHOD Clear(void);
+
+  // nsISupportsArray methods:
+  NS_IMETHOD_(PRBool) Equals(const nsISupportsArray* aOther);
+
+  NS_IMETHOD_(nsISupports*) ElementAt(PRUint32 aIndex);
+
+  NS_IMETHOD_(PRInt32) IndexOf(const nsISupports* aPossibleElement);
+  NS_IMETHOD_(PRInt32) IndexOfStartingAt(const nsISupports* aPossibleElement,
+                                         PRUint32 aStartIndex = 0);
+  NS_IMETHOD_(PRInt32) LastIndexOf(const nsISupports* aPossibleElement);
+
+  NS_IMETHOD GetIndexOf(nsISupports *aPossibleElement, PRInt32 *_retval) {
+    *_retval = IndexOf(aPossibleElement);
+    return NS_OK;
+  }
+  
+  NS_IMETHOD GetIndexOfStartingAt(nsISupports *aPossibleElement,
+                                  PRUint32 aStartIndex, PRInt32 *_retval) {
+    *_retval = IndexOfStartingAt(aPossibleElement, aStartIndex);
+    return NS_OK;
+  }
+  
+  NS_IMETHOD GetLastIndexOf(nsISupports *aPossibleElement, PRInt32 *_retval) {
+    *_retval = LastIndexOf(aPossibleElement);
+    return NS_OK;
+  }
+  
+  NS_IMETHOD_(PRBool) InsertElementAt(nsISupports* aElement, PRUint32 aIndex);
+
+  NS_IMETHOD_(PRBool) ReplaceElementAt(nsISupports* aElement, PRUint32 aIndex);
+
+  NS_IMETHOD_(PRBool) RemoveElementAt(PRUint32 aIndex) {
+    return RemoveElementsAt(aIndex,1);
+  }
+  NS_IMETHOD_(PRBool) RemoveElement(const nsISupports* aElement, PRUint32 aStartIndex = 0);
+  NS_IMETHOD_(PRBool) RemoveLastElement(const nsISupports* aElement);
+
+  NS_IMETHOD DeleteLastElement(nsISupports *aElement) {
+    return (RemoveLastElement(aElement) ? NS_OK : NS_ERROR_FAILURE);
+  }
+  
+  NS_IMETHOD DeleteElementAt(PRUint32 aIndex) {
+    return (RemoveElementAt(aIndex) ? NS_OK : NS_ERROR_FAILURE);
+  }
+  
+  NS_IMETHOD_(PRBool) AppendElements(nsISupportsArray* aElements) {
+    return InsertElementsAt(aElements,mCount);
+  }
+  
+  NS_IMETHOD Compact(void);
+
+  NS_IMETHOD_(PRBool) EnumerateForwards(nsISupportsArrayEnumFunc aFunc, void* aData);
+  NS_IMETHOD_(PRBool) EnumerateBackwards(nsISupportsArrayEnumFunc aFunc, void* aData);
+
+  NS_IMETHOD Clone(nsISupportsArray **_retval);
+
+  NS_IMETHOD_(PRBool) InsertElementsAt(nsISupportsArray *aOther, PRUint32 aIndex);
+
+  NS_IMETHOD_(PRBool) RemoveElementsAt(PRUint32 aIndex, PRUint32 aCount);
+
+  NS_IMETHOD_(PRBool) SizeTo(PRInt32 aSize);
+protected:
+  void DeleteArray(void);
+
+  NS_IMETHOD_(PRBool) GrowArrayBy(PRInt32 aGrowBy);
+
+  nsISupports** mArray;
+  PRUint32 mArraySize;
+  PRUint32 mCount;
+  nsISupports*  mAutoArray[kAutoArraySize];
+#if DEBUG_SUPPORTSARRAY
+  PRUint32 mMaxCount;
+  PRUint32 mMaxSize;
+#endif
+
+private:
+  // Copy constructors are not allowed
+  nsSupportsArray(const nsISupportsArray& other);
+};
+
+#undef  IMETHOD_VISIBILITY
+#define IMETHOD_VISIBILITY NS_VISIBILITY_HIDDEN
+
+#endif // nsSupportsArray_h__