author Jared Wein <>
Fri, 23 Mar 2012 11:46:12 -0700
changeset 93438 eb9dfe4659a70b1fba1cc18e0525fddc60258fac
parent 1 9b2a99adc05e53cd4010de512f50118594756650
child 98529 f4157e8c410708d76703f19e4dfb61859bfe32d8
permissions -rw-r--r--
Backed out changeset 5f79a3dd45ff (bug 730318) r=bustage

/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* ***** 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
 * 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 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 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 ***** */

#include "nsIInputStream.idl"
#include "nsIStreamListener.idl"

#define NS_ISTREAMCONVERTER_KEY         ";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);

     * 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);

     * 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);