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+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsISupports.idl"
+
+interface nsIInputStream;
+interface nsIOutputStream;
+
+/**
+ * nsIIOUtil provdes various xpcom/io-related utility methods.
+ */
+[scriptable, uuid(e8152f7f-4209-4c63-ad23-c3d2aa0c5a49)]
+interface nsIIOUtil : nsISupports
+{
+ /**
+ * Test whether an input stream is buffered. See nsStreamUtils.h
+ * documentation for NS_InputStreamIsBuffered for the definition of
+ * "buffered" used here and for edge-case behavior.
+ *
+ * @throws NS_ERROR_INVALID_POINTER if null is passed in.
+ */
+ boolean inputStreamIsBuffered(in nsIInputStream aStream);
+
+ /**
+ * Test whether an output stream is buffered. See nsStreamUtils.h
+ * documentation for NS_OutputStreamIsBuffered for the definition of
+ * "buffered" used here and for edge-case behavior.
+ *
+ * @throws NS_ERROR_INVALID_POINTER if null is passed in.
+ */
+ boolean outputStreamIsBuffered(in nsIOutputStream aStream);
+};