/* -*- Mode: IDL; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at
http://mozilla.org/MPL/2.0/. */
#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;
};
