gecko-dev/netwerk/base/public/nsIResumableChannel.idl

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/* -*- 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 Bradley Baetz
* Portions created by the Initial Developer are Copyright (C) 2001, 2002
* the Initial Developer. All Rights Reserved.
*
* Contributor(s): Bradley Baetz <bbaetz@student.usyd.edu.au>
*
* 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 "nsISupports.idl"
interface nsIStreamListener;
[scriptable, uuid(4ad136fa-83af-4a22-a76e-503642c0f4a8)]
interface nsIResumableChannel : nsISupports {
/**
* Prepare this channel for resuming. The request will not start until
* asyncOpen or open is called. Calling resumeAt after open or asyncOpen
* has been called has undefined behaviour.
*
* @param startPos the starting offset, in bytes, to use to download
* @param entityID information about the file, to match before obtaining
* the file. Pass an empty string to use anything.
*
* During OnStartRequest, this channel will have a status of
* NS_ERROR_NOT_RESUMABLE if the file cannot be resumed, eg because the
* server doesn't support this. This error may occur even if startPos
* is 0, so that the front end can warn the user.
* Similarly, the status of this channel during OnStartRequest may be
* NS_ERROR_ENTITY_CHANGED, which indicates that the entity has changed,
* as indicated by a changed entityID.
* In both of these cases, no OnDataAvailable will be called, and
* OnStopRequest will immediately follow with the same status code.
*/
void resumeAt(in unsigned long long startPos,
in ACString entityID);
/**
* The entity id for this URI. Available after OnStartRequest.
* @throw NS_ERROR_NOT_RESUMABLE if this load is not resumable.
*/
readonly attribute ACString entityID;
};