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FileIOObject.cpp
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FileIOObject.cpp
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/* -*- Mode: C++; tab-width: 2; 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 "FileIOObject.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/ProgressEvent.h"
#include "mozilla/EventDispatcher.h"
#include "nsComponentManagerUtils.h"
#include "nsError.h"
#include "nsIDOMEvent.h"
#define ERROR_STR "error"
#define ABORT_STR "abort"
#define PROGRESS_STR "progress"
namespace mozilla {
namespace dom {
const uint64_t kUnknownSize = uint64_t(-1);
NS_IMPL_ADDREF_INHERITED(FileIOObject, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(FileIOObject, DOMEventTargetHelper)
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(FileIOObject)
NS_INTERFACE_MAP_ENTRY(nsITimerCallback)
NS_INTERFACE_MAP_ENTRY(nsIInputStreamCallback)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_CLASS(FileIOObject)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(FileIOObject,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mProgressNotifier)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mError)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(FileIOObject,
DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mProgressNotifier)
NS_IMPL_CYCLE_COLLECTION_UNLINK(mError)
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_EVENT_HANDLER(FileIOObject, abort)
NS_IMPL_EVENT_HANDLER(FileIOObject, error)
NS_IMPL_EVENT_HANDLER(FileIOObject, progress)
FileIOObject::FileIOObject()
: mProgressEventWasDelayed(false),
mTimerIsActive(false),
mReadyState(0),
mTotal(0), mTransferred(0)
{}
FileIOObject::~FileIOObject()
{}
void
FileIOObject::StartProgressEventTimer()
{
if (!mProgressNotifier) {
mProgressNotifier = do_CreateInstance(NS_TIMER_CONTRACTID);
}
if (mProgressNotifier) {
mProgressEventWasDelayed = false;
mTimerIsActive = true;
mProgressNotifier->Cancel();
mProgressNotifier->InitWithCallback(this, NS_PROGRESS_EVENT_INTERVAL,
nsITimer::TYPE_ONE_SHOT);
}
}
void
FileIOObject::ClearProgressEventTimer()
{
mProgressEventWasDelayed = false;
mTimerIsActive = false;
if (mProgressNotifier) {
mProgressNotifier->Cancel();
}
}
void
FileIOObject::DispatchError(nsresult rv, nsAString& finalEvent)
{
// Set the status attribute, and dispatch the error event
switch (rv) {
case NS_ERROR_FILE_NOT_FOUND:
mError = new DOMError(GetOwner(), NS_LITERAL_STRING("NotFoundError"));
break;
case NS_ERROR_FILE_ACCESS_DENIED:
mError = new DOMError(GetOwner(), NS_LITERAL_STRING("SecurityError"));
break;
default:
mError = new DOMError(GetOwner(), NS_LITERAL_STRING("NotReadableError"));
break;
}
// Dispatch error event to signify load failure
DispatchProgressEvent(NS_LITERAL_STRING(ERROR_STR));
DispatchProgressEvent(finalEvent);
}
nsresult
FileIOObject::DispatchProgressEvent(const nsAString& aType)
{
ProgressEventInit init;
init.mBubbles = false;
init.mCancelable = false;
init.mLoaded = mTransferred;
if (mTotal != kUnknownSize) {
init.mLengthComputable = true;
init.mTotal = mTotal;
} else {
init.mLengthComputable = false;
init.mTotal = 0;
}
nsRefPtr<ProgressEvent> event =
ProgressEvent::Constructor(this, aType, init);
event->SetTrusted(true);
return DispatchDOMEvent(nullptr, event, nullptr, nullptr);
}
// nsITimerCallback
NS_IMETHODIMP
FileIOObject::Notify(nsITimer* aTimer)
{
nsresult rv;
mTimerIsActive = false;
if (mProgressEventWasDelayed) {
rv = DispatchProgressEvent(NS_LITERAL_STRING("progress"));
NS_ENSURE_SUCCESS(rv, rv);
StartProgressEventTimer();
}
return NS_OK;
}
// InputStreamCallback
NS_IMETHODIMP
FileIOObject::OnInputStreamReady(nsIAsyncInputStream* aStream)
{
if (mReadyState != 1 || aStream != mAsyncStream) {
return NS_OK;
}
uint64_t aCount;
nsresult rv = aStream->Available(&aCount);
if (NS_SUCCEEDED(rv) && aCount) {
rv = DoReadData(aStream, aCount);
}
if (NS_SUCCEEDED(rv)) {
rv = DoAsyncWait(aStream);
}
if (NS_FAILED(rv) || !aCount) {
if (rv == NS_BASE_STREAM_CLOSED) {
rv = NS_OK;
}
return OnLoadEnd(rv);
}
mTransferred += aCount;
//Notify the timer is the appropriate timeframe has passed
if (mTimerIsActive) {
mProgressEventWasDelayed = true;
} else {
rv = DispatchProgressEvent(NS_LITERAL_STRING(PROGRESS_STR));
NS_ENSURE_SUCCESS(rv, rv);
StartProgressEventTimer();
}
return NS_OK;
}
nsresult
FileIOObject::OnLoadEnd(nsresult aStatus)
{
// Cancel the progress event timer
ClearProgressEventTimer();
// FileIOObject must be in DONE stage after an operation
mReadyState = 2;
nsString successEvent, termEvent;
nsresult rv = DoOnLoadEnd(aStatus, successEvent, termEvent);
NS_ENSURE_SUCCESS(rv, rv);
// Set the status field as appropriate
if (NS_FAILED(aStatus)) {
DispatchError(aStatus, termEvent);
return NS_OK;
}
// Dispatch event to signify end of a successful operation
DispatchProgressEvent(successEvent);
DispatchProgressEvent(termEvent);
return NS_OK;
}
nsresult
FileIOObject::DoAsyncWait(nsIAsyncInputStream* aStream)
{
return aStream->AsyncWait(this,
/* aFlags*/ 0,
/* aRequestedCount */ 0,
NS_GetCurrentThread());
}
void
FileIOObject::Abort(ErrorResult& aRv)
{
if (mReadyState != 1) {
// XXX The spec doesn't say this
aRv.Throw(NS_ERROR_DOM_FILE_ABORT_ERR);
return;
}
ClearProgressEventTimer();
mReadyState = 2; // There are DONE constants on multiple interfaces,
// but they all have value 2.
// XXX The spec doesn't say this
mError = new DOMError(GetOwner(), NS_LITERAL_STRING("AbortError"));
nsString finalEvent;
DoAbort(finalEvent);
// Dispatch the events
DispatchProgressEvent(NS_LITERAL_STRING(ABORT_STR));
DispatchProgressEvent(finalEvent);
}
} // namespace dom
} // namespace mozilla