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+/* -*- Mode: C++; tab-width: 4; 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 nsIChannel;
+
+/**
+ * An interface to access the the base channel
+ * associated with a MultiPartChannel.
+ */
+
+[scriptable, builtinclass, uuid(4fefb490-5567-11e5-a837-0800200c9a66)]
+interface nsIMultiPartChannel : nsISupports
+{
+ /**
+ * readonly attribute to access the underlying channel
+ */
+ readonly attribute nsIChannel baseChannel;
+
+ /**
+ * Attribute guaranteed to be different for different parts of
+ * the same multipart document.
+ */
+ readonly attribute uint32_t partID;
+
+ [noscript] readonly attribute boolean isFirstPart;
+
+ /**
+ * Set to true when onStopRequest is received from the base channel.
+ * The listener can check this from its onStopRequest to determine
+ * whether more data can be expected.
+ */
+ readonly attribute boolean isLastPart;
+};
+
+/**
+ * An interface that listeners can implement to receive a notification
+ * when the last part of the multi-part channel has finished, and the
+ * final OnStopRequest has been sent.
+ */
+[scriptable, uuid(b084959a-4fb9-41a5-88a0-d0f045ce75cf)]
+interface nsIMultiPartChannelListener : nsISupports
+{
+ /**
+ * Sent when all parts have finished and sent OnStopRequest.
+ */
+ void onAfterLastPart(in nsresult status);
+};