pjs/netwerk/base/public/nsIUnicharStreamLoader.idl

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/* -*- 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) 2002
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Darin Fisher <darin@netscape.com> (original author)
*
* 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 "nsIStreamListener.idl"
interface nsIUnicharInputStream;
interface nsIUnicharStreamLoader;
interface nsIChannel;
[scriptable, uuid(6bb3e55b-69c0-4fc9-87e5-bed780d997ce)]
interface nsIUnicharStreamLoaderObserver : nsISupports
{
/**
* Called when the first full segment of data if available.
*
* @param aLoader the unichar stream loader
* @param aContext the context parameter of the underlying channel
* @param aFirstSegment the raw bytes of the first full data segment
* @param aLength the length of aFirstSegment
*
* @return charset corresponding to this stream
*
* @note this method will only be called if the stream loader receives an
* OnDataAvailable call.
*/
ACString onDetermineCharset(in nsIUnicharStreamLoader aLoader,
in nsISupports aContext,
[size_is(aLength)] in string aFirstSegment,
in unsigned long aLength);
/**
* Called when the entire stream has been loaded.
*
* @param aLoader the unichar stream loader
* @param aContext the context parameter of the underlying channel
* @param aStatus the status of the underlying channel
* @param aUnicharData the unichar input stream containing the data. This
* can be null in some failure conditions.
*
* This method will always be called asynchronously by the
* nsUnicharIStreamLoader involved, on the thread that called the
* loader's init() method.
*
* @note If the stream loader does not receive an OnDataAvailable call,
* aUnicharData will be null, and aStatus will be a success value.
*/
void onStreamComplete(in nsIUnicharStreamLoader aLoader,
in nsISupports aContext,
in nsresult aStatus,
in nsIUnicharInputStream aUnicharData);
};
/**
* Asynchronously load a channel, converting the data to UTF-16.
*
* To use this interface, first call init() with a
* nsIUnicharStreamLoaderObserver that will be notified when the data has been
* loaded. Then call asyncOpen() on the channel with the nsIUnicharStreamLoader
* as the listener. The context argument in the asyncOpen() call will be
* passed to the onStreamComplete() callback.
*/
[scriptable, uuid(9037f476-7c08-4729-b690-3e425269802b)]
interface nsIUnicharStreamLoader : nsIStreamListener
{
const unsigned long DEFAULT_SEGMENT_SIZE = 4096;
/**
* Initializes the unichar stream loader
*
* @param aObserver the observer to notify when a charset is needed and when
* the load is complete
* @param aSegmentSize the size of the segments to use for the data, in bytes
*/
void init(in nsIUnicharStreamLoaderObserver aObserver,
in unsigned long aSegmentSize);
/**
* The channel attribute is only valid inside the onDetermineCharset
* and onStreamComplete callbacks. Otherwise it will be null.
*/
readonly attribute nsIChannel channel;
/**
* The charset that onDetermineCharset returned, if that's been
* called.
*/
readonly attribute ACString charset;
};