/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** 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
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 * ***** END LICENSE BLOCK ***** */

#include "nsISupports.idl"
#include "nsIChannel.idl"

interface nsIRequest;
interface nsIURI;
interface nsILoadGroup;
interface nsIStreamLoader;
interface nsIInterfaceRequestor;

[scriptable, uuid(359F7990-D4E9-11d3-A1A5-0050041CAF44)]
interface nsIStreamLoaderObserver : nsISupports
{
    void onStreamComplete(in nsIStreamLoader loader,
                          in nsISupports ctxt,
                          in nsresult status,
                          in unsigned long resultLength,
                          [const,array,size_is(resultLength)] in octet result);
};

/**
 * Asynchronously loads a channel into a memory buffer.
 *
 * XXX define behaviour for sizes >4 GB
 */
[scriptable, uuid(31d37360-8e5a-11d3-93ad-00104ba0fd40)]
interface nsIStreamLoader : nsISupports
{
    /**
     * Initialize this stream loader, and start loading the data.
     *
     * @param aChannel
     *        A Channel to load data from. This must not be asyncOpen'd yet!
     * @param aObserver
     *        An observer that will be notified when the data is complete.
     * @param aContext
     *        May be null. Will be passed to the observer.
     *
     * @note Failure to open the channel will be indicated by an async callback
     *       to the observer.
     */
    void init(in nsIChannel aChannel,
              in nsIStreamLoaderObserver aObserver,
              in nsISupports aContext);

    /**
     * Gets the number of bytes read so far.
     */
    readonly attribute unsigned long numBytesRead;

    /**
     * Gets the request that loaded this file.
     * null after the request has finished loading.
     */
    readonly attribute nsIRequest request;
};