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diff --git a/src/libs/xpcom18a4/xpcom/io/nsStreamUtils.h b/src/libs/xpcom18a4/xpcom/io/nsStreamUtils.h
new file mode 100644
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+++ b/src/libs/xpcom18a4/xpcom/io/nsStreamUtils.h
@@ -0,0 +1,111 @@
+/* ***** 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.
+ *
+ * The Initial Developer of the Original Code is
+ * Netscape Communications Corporation.
+ * Portions created by the Initial Developer are Copyright (C) 2002
+ * the Initial Developer. All Rights Reserved.
+ *
+ * Contributor(s):
+ *   Darin Fisher <darin@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 nsStreamUtils_h__
+#define nsStreamUtils_h__
+
+#include "nscore.h"
+
+class nsIInputStream;
+class nsIOutputStream;
+class nsIInputStreamCallback;
+class nsIOutputStreamCallback;
+class nsIEventTarget;
+
+/**
+ * A "one-shot" proxy of the OnInputStreamReady callback.  The resulting
+ * proxy object's OnInputStreamReady function may only be called once!  The
+ * proxy object ensures that the real notify object will be free'd on the
+ * thread corresponding to the given event target regardless of what thread
+ * the proxy object is destroyed on.
+ *
+ * This function is designed to be used to implement AsyncWait when the
+ * aEventTarget parameter is non-null.
+ */
+extern NS_COM nsresult
+NS_NewInputStreamReadyEvent(nsIInputStreamCallback **aEvent,
+                            nsIInputStreamCallback  *aNotify,
+                            nsIEventTarget          *aEventTarget);
+
+/**
+ * A "one-shot" proxy of the OnOutputStreamReady callback.  The resulting
+ * proxy object's OnOutputStreamReady function may only be called once!  The
+ * proxy object ensures that the real notify object will be free'd on the
+ * thread corresponding to the given event target regardless of what thread 
+ * the proxy object is destroyed on.
+ *
+ * This function is designed to be used to implement AsyncWait when the
+ * aEventTarget parameter is non-null.
+ */
+extern NS_COM nsresult
+NS_NewOutputStreamReadyEvent(nsIOutputStreamCallback **aEvent,
+                             nsIOutputStreamCallback  *aNotify,
+                             nsIEventTarget           *aEventTarget);
+
+/* ------------------------------------------------------------------------- */
+
+enum nsAsyncCopyMode {
+    NS_ASYNCCOPY_VIA_READSEGMENTS,
+    NS_ASYNCCOPY_VIA_WRITESEGMENTS
+};
+
+/**
+ * This function is called when the async copy process completes.  The reported
+ * status is NS_OK on success and some error code on failure.
+ */
+typedef void (* nsAsyncCopyCallbackFun)(void *closure, nsresult status);
+
+/**
+ * This function asynchronously copies data from the source to the sink. All
+ * data transfer occurs on the thread corresponding to the given event target.
+ * A null event target is not permitted.
+ *
+ * The copier handles blocking or non-blocking streams transparently.  If a
+ * stream operation returns NS_BASE_STREAM_WOULD_BLOCK, then the stream will
+ * be QI'd to nsIAsync{In,Out}putStream and its AsyncWait method will be used
+ * to determine when to resume copying.
+ */
+extern NS_COM nsresult
+NS_AsyncCopy(nsIInputStream         *aSource,
+             nsIOutputStream        *aSink,
+             nsIEventTarget         *aEventTarget,
+             nsAsyncCopyMode         aMode = NS_ASYNCCOPY_VIA_READSEGMENTS,
+             PRUint32                aChunkSize = 4096,
+             nsAsyncCopyCallbackFun  aCallbackFun = nsnull,
+             void                   *aCallbackClosure = nsnull);
+
+#endif // !nsStreamUtils_h__