RetroZilla/netwerk/streamconv/public/nsIStreamConverterService.idl

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2015-10-21 05:03:22 +02:00
/* -*- 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
* 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.org 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"
%{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(e086e1e2-40ff-4193-8b8c-bd548babe70d)]
interface nsIStreamConverterService : nsISupports {
/**
* <b>SYNCRONOUS 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>ASYNCRONOUS 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);
};