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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsIStreamListener.idl"
interface nsIRequest;
interface nsIIncrementalStreamLoader;
[scriptable, uuid(07c3d2cc-5454-4618-9f4f-cd93de9504a4)]
interface nsIIncrementalStreamLoaderObserver : nsISupports
{
/**
* Called when new data has arrived on the stream.
*
* @param loader the stream loader that loaded the stream.
* @param ctxt the context parameter of the underlying channel
* @param dataLength the length of the new data received
* @param data the contents of the new data received.
*
* This method will always be called asynchronously by the
* nsIIncrementalStreamLoader involved, on the thread that called the
* loader's init() method.
*
* If the observer wants to not accumulate all or portional of the data in
* the internal buffer, the consumedLength shall be set to the value of
* the dataLength or less. By default the consumedLength value is assumed 0.
* The data and dataLength reflect the non-consumed data and will be
* accumulated if consumedLength is not set.
*
* In comparison with onStreamComplete(), the data buffer cannot be
* adopted if this method returns NS_SUCCESS_ADOPTED_DATA.
*/
void onIncrementalData(in nsIIncrementalStreamLoader loader,
in nsISupports ctxt,
in unsigned long dataLength,
[const,array,size_is(dataLength)] in octet data,
inout unsigned long consumedLength);
/**
* Called when the entire stream has been loaded.
*
* @param loader the stream loader that loaded the stream.
* @param ctxt the context parameter of the underlying channel
* @param status the status of the underlying channel
* @param resultLength the length of the data loaded
* @param result the data
*
* This method will always be called asynchronously by the
* nsIIncrementalStreamLoader involved, on the thread that called the
* loader's init() method.
*
* If the observer wants to take over responsibility for the
* data buffer (result), it returns NS_SUCCESS_ADOPTED_DATA
* in place of NS_OK as its success code. The loader will then
* "forget" about the data and not free() it after
* onStreamComplete() returns; observer must call free()
* when the data is no longer required.
*/
void onStreamComplete(in nsIIncrementalStreamLoader 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.
*
* To use this interface, first call init() with a nsIIncrementalStreamLoaderObserver
* that will be notified when the data has been loaded. Then call asyncOpen()
* on the channel with the nsIIncrementalStreamLoader as the listener. The context
* argument in the asyncOpen() call will be passed to the onStreamComplete()
* callback.
*
* XXX define behaviour for sizes >4 GB
*/
[scriptable, uuid(a023b060-ba23-431a-b449-2dd63e220554)]
interface nsIIncrementalStreamLoader : nsIStreamListener
{
/**
* Initialize this stream loader, and start loading the data.
*
* @param aObserver
* An observer that will be notified when the data is complete.
*/
void init(in nsIIncrementalStreamLoaderObserver aObserver);
/**
* 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;
};
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