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90 lines
3.8 KiB
Plaintext
90 lines
3.8 KiB
Plaintext
/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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interface nsIChannel;
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interface nsIInputStream;
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interface nsIStreamListener;
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%{C++
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#define NS_ISTREAMCONVERTER_KEY "@mozilla.org/streamconv;1"
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%}
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/**
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* The nsIStreamConverterService is a higher level stream converter factory
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* responsible for locating and creating stream converters
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* (nsIStreamConverter).
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*
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* This service retrieves an interface that can convert data from a particular
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* MIME type, to a particular MIME type. It is responsible for any intermediary
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* conversion required in order to get from X to Z, assuming direct conversion
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* is not possible.
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*
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* @author Jud Valeski
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* @see nsIStreamConverter
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*/
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[scriptable, uuid(f2b1ab53-f0bd-4adb-9365-e59b1701a258)]
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interface nsIStreamConverterService : nsISupports {
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/**
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* Tests whether conversion between the two specified types is possible.
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* This is cheaper than calling convert()/asyncConvertData(); it is not
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* necessary to call this function before calling one of those, though.
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*/
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boolean canConvert(in string aFromType, in string aToType);
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/**
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* Returns the content type that will be returned from a converter
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* created with aFromType and * /*.
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* Can fail if no converters support this conversion, or if the
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* output type isn't known in advance.
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*/
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ACString convertedType(in ACString aFromType, in nsIChannel aChannel);
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/**
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* <b>SYNCHRONOUS VERSION</b>
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* Converts a stream of one type, to a stream of another type.
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*
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* Use this method when you have a stream you want to convert.
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*
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* @param aFromStream The stream representing the original/raw data.
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* @param aFromType The MIME type of aFromStream.
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* @param aToType The MIME type of the returned stream.
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* @param aContext Either an opaque context, or a converter specific
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* context (implementation specific).
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* @return The converted stream. NOTE: The returned stream
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* may not already be converted. An efficient stream
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* converter implementation will convert data on
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* demand rather than buffering the converted data
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* until it is used.
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*/
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nsIInputStream convert(in nsIInputStream aFromStream,
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in string aFromType,
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in string aToType,
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in nsISupports aContext);
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/**
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* <b>ASYNCHRONOUS VERSION</b>
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* Retrieves a nsIStreamListener that receives the original/raw data via its
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* nsIStreamListener::OnDataAvailable() callback, then converts and pushes
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* the data to aListener.
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*
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* Use this method when you want to proxy (and convert) nsIStreamListener
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* callbacks asynchronously.
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*
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* @param aFromType The MIME type of the original/raw data.
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* @param aToType The MIME type of the converted data.
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* @param aListener The listener that receives the converted data.
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* @param aCtxt Either an opaque context, or a converter specific
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* context (implementation specific).
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* @return A nsIStreamListener that receives data via its
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* OnDataAvailable() method.
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*/
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nsIStreamListener asyncConvertData(in string aFromType,
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in string aToType,
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in nsIStreamListener aListener,
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in nsISupports aContext);
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};
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