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+/* -*- Mode: IDL; 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 nsIInputStream;
+interface nsIStreamListener;
+
+%{C++
+#define NS_ISTREAMCONVERTER_KEY "@mozilla.org/streamconv;1"
+%}
+
+/**
+ * The nsIStreamConverterService is a higher level stream converter factory
+ * responsible for locating and creating stream converters
+ * (nsIStreamConverter).
+ *
+ * This service retrieves an interface that can convert data from a particular
+ * MIME type, to a particular MIME type. It is responsible for any intermediary
+ * conversion required in order to get from X to Z, assuming direct conversion
+ * is not possible.
+ *
+ * @author Jud Valeski
+ * @see nsIStreamConverter
+ */
+[scriptable, uuid(f2b1ab53-f0bd-4adb-9365-e59b1701a258)]
+interface nsIStreamConverterService : nsISupports {
+ /**
+ * Tests whether conversion between the two specified types is possible.
+ * This is cheaper than calling convert()/asyncConvertData(); it is not
+ * necessary to call this function before calling one of those, though.
+ */
+ boolean canConvert(in string aFromType, in string aToType);
+
+ /**
+ * <b>SYNCHRONOUS VERSION</b>
+ * Converts a stream of one type, to a stream of another type.
+ *
+ * Use this method when you have a stream you want to convert.
+ *
+ * @param aFromStream The stream representing the original/raw data.
+ * @param aFromType The MIME type of aFromStream.
+ * @param aToType The MIME type of the returned stream.
+ * @param aContext Either an opaque context, or a converter specific
+ * context (implementation specific).
+ * @return The converted stream. NOTE: The returned stream
+ * may not already be converted. An efficient stream
+ * converter implementation will convert data on
+ * demand rather than buffering the converted data
+ * until it is used.
+ */
+ nsIInputStream convert(in nsIInputStream aFromStream,
+ in string aFromType,
+ in string aToType,
+ in nsISupports aContext);
+
+ /**
+ * <b>ASYNCHRONOUS VERSION</b>
+ * Retrieves a nsIStreamListener that receives the original/raw data via its
+ * nsIStreamListener::OnDataAvailable() callback, then converts and pushes
+ * the data to aListener.
+ *
+ * Use this method when you want to proxy (and convert) nsIStreamListener
+ * callbacks asynchronously.
+ *
+ * @param aFromType The MIME type of the original/raw data.
+ * @param aToType The MIME type of the converted data.
+ * @param aListener The listener that receives the converted data.
+ * @param aCtxt Either an opaque context, or a converter specific
+ * context (implementation specific).
+ * @return A nsIStreamListener that receives data via its
+ * OnDataAvailable() method.
+ */
+ nsIStreamListener asyncConvertData(in string aFromType,
+ in string aToType,
+ in nsIStreamListener aListener,
+ in nsISupports aContext);
+};