gecko-dev/dom/file/ArchiveReader.cpp
Andrea Marchesini 64d6829083 Bug 795930 - Hide ArchiveReader feature behind a pref (disabled by default), r=mounir
--HG--
extra : rebase_source : fc267035c0eb85bb08b9da91bf79ecbb816da1b3
2012-11-08 15:57:17 +00:00

260 lines
6.5 KiB
C++

/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=2 et sw=2 tw=80: */
/* 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 "ArchiveReader.h"
#include "ArchiveRequest.h"
#include "ArchiveEvent.h"
#include "ArchiveZipEvent.h"
#include "nsContentUtils.h"
#include "nsLayoutStatics.h"
#include "nsDOMClassInfoID.h"
#include "nsIURI.h"
#include "nsNetUtil.h"
#include "mozilla/Preferences.h"
USING_FILE_NAMESPACE
ArchiveReader::ArchiveReader()
: mBlob(nullptr),
mWindow(nullptr),
mStatus(NOT_STARTED)
{
MOZ_COUNT_CTOR(ArchiveReader);
nsLayoutStatics::AddRef();
}
ArchiveReader::~ArchiveReader()
{
MOZ_COUNT_DTOR(ArchiveReader);
nsLayoutStatics::Release();
}
bool
ArchiveReader::PrefEnabled()
{
return Preferences::GetBool("dom.archivereader.enabled", true);
}
NS_IMETHODIMP
ArchiveReader::Initialize(nsISupports* aOwner,
JSContext* aCx,
JSObject* aObj,
uint32_t aArgc,
JS::Value* aArgv)
{
NS_ENSURE_TRUE(aArgc == 1 || aArgc == 2, NS_ERROR_INVALID_ARG);
if (!PrefEnabled()) {
return NS_ERROR_UNEXPECTED;
}
// We expect to get a Blob object
if (!aArgv[0].isObject()) {
return NS_ERROR_INVALID_ARG; // We're not interested
}
JSObject* obj = &aArgv[0].toObject();
nsCOMPtr<nsIDOMBlob> blob;
blob = do_QueryInterface(nsContentUtils::XPConnect()->GetNativeOfWrapper(aCx, obj));
if (!blob) {
return NS_ERROR_INVALID_ARG;
}
// Extra param is an object
if (aArgc > 1) {
nsresult rv = mOptions.Init(aCx, &aArgv[1]);
NS_ENSURE_SUCCESS(rv, rv);
}
mWindow = do_QueryInterface(aOwner);
if (!mWindow) {
return NS_ERROR_UNEXPECTED;
}
mBlob = blob;
return NS_OK;
}
nsresult
ArchiveReader::RegisterRequest(ArchiveRequest* aRequest)
{
switch (mStatus) {
// Append to the list and let's start to work:
case NOT_STARTED:
mRequests.AppendElement(aRequest);
return OpenArchive();
// Just append to the list:
case WORKING:
mRequests.AppendElement(aRequest);
return NS_OK;
// Return data!
case READY:
RequestReady(aRequest);
return NS_OK;
}
NS_ASSERTION(false, "unexpected mStatus value");
return NS_OK;
}
// This returns the input stream
nsresult
ArchiveReader::GetInputStream(nsIInputStream** aInputStream)
{
// Getting the input stream
mBlob->GetInternalStream(aInputStream);
NS_ENSURE_TRUE(*aInputStream, NS_ERROR_UNEXPECTED);
return NS_OK;
}
nsresult
ArchiveReader::GetSize(uint64_t* aSize)
{
nsresult rv = mBlob->GetSize(aSize);
NS_ENSURE_SUCCESS(rv, rv);
return NS_OK;
}
// Here we open the archive:
nsresult
ArchiveReader::OpenArchive()
{
mStatus = WORKING;
nsresult rv;
// Target:
nsCOMPtr<nsIEventTarget> target = do_GetService(NS_STREAMTRANSPORTSERVICE_CONTRACTID);
NS_ASSERTION(target, "Must have stream transport service");
// Here a Event to make everything async:
nsRefPtr<ArchiveReaderEvent> event;
/* FIXME: If we want to support more than 1 format we should check the content type here: */
event = new ArchiveReaderZipEvent(this, mOptions);
rv = target->Dispatch(event, NS_DISPATCH_NORMAL);
NS_ENSURE_SUCCESS(rv, rv);
// In order to be sure that this object exists when the event finishes its task,
// we increase the refcount here:
AddRef();
return NS_OK;
}
// Data received from the dispatched event:
void
ArchiveReader::Ready(nsTArray<nsCOMPtr<nsIDOMFile> >& aFileList,
nsresult aStatus)
{
mStatus = READY;
// Let's store the values:
mData.fileList = aFileList;
mData.status = aStatus;
// Propagate the results:
for (uint32_t index = 0; index < mRequests.Length(); ++index) {
nsRefPtr<ArchiveRequest> request = mRequests[index];
RequestReady(request);
}
mRequests.Clear();
// The async operation is concluded, we can decrease the reference:
Release();
}
void
ArchiveReader::RequestReady(ArchiveRequest* aRequest)
{
// The request will do the rest:
aRequest->ReaderReady(mData.fileList, mData.status);
}
/* nsIDOMArchiveRequest getFilenames (); */
NS_IMETHODIMP
ArchiveReader::GetFilenames(nsIDOMArchiveRequest** _retval)
{
nsRefPtr<ArchiveRequest> request = GenerateArchiveRequest();
request->OpGetFilenames();
request.forget(_retval);
return NS_OK;
}
/* nsIDOMArchiveRequest getFile (in DOMString filename); */
NS_IMETHODIMP
ArchiveReader::GetFile(const nsAString& filename,
nsIDOMArchiveRequest** _retval)
{
nsRefPtr<ArchiveRequest> request = GenerateArchiveRequest();
request->OpGetFile(filename);
request.forget(_retval);
return NS_OK;
}
/* nsIDOMArchiveRequest getFiles (); */
NS_IMETHODIMP
ArchiveReader::GetFiles(nsIDOMArchiveRequest** _retval)
{
nsRefPtr<ArchiveRequest> request = GenerateArchiveRequest();
request->OpGetFiles();
request.forget(_retval);
return NS_OK;
}
already_AddRefed<ArchiveRequest>
ArchiveReader::GenerateArchiveRequest()
{
NS_ASSERTION(NS_IsMainThread(), "Wrong thread!");
return ArchiveRequest::Create(mWindow, this);
}
NS_IMPL_CYCLE_COLLECTION_CLASS(ArchiveReader)
// C++ traverse
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN(ArchiveReader)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mBlob)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSCOMPTR(mWindow)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_NSTARRAY_OF_NSCOMPTR(mData.fileList)
for (uint32_t i = 0; i < tmp->mRequests.Length(); i++) {
NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(cb, "mRequests[i]");
cb.NoteXPCOMChild(static_cast<nsIDOMArchiveRequest*>(tmp->mRequests[i].get()));
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
// Unlink
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN(ArchiveReader)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mBlob)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSCOMPTR(mWindow)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSTARRAY(mData.fileList)
NS_IMPL_CYCLE_COLLECTION_UNLINK_NSTARRAY(mRequests)
tmp->mRequests.Clear();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(ArchiveReader)
NS_INTERFACE_MAP_ENTRY_AMBIGUOUS(nsISupports, nsIDOMArchiveReader)
NS_INTERFACE_MAP_ENTRY(nsIJSNativeInitializer)
NS_INTERFACE_MAP_ENTRY(nsIDOMArchiveReader)
NS_DOM_INTERFACE_MAP_ENTRY_CLASSINFO(ArchiveReader)
NS_INTERFACE_MAP_END
NS_IMPL_CYCLE_COLLECTING_ADDREF(ArchiveReader)
NS_IMPL_CYCLE_COLLECTING_RELEASE(ArchiveReader)
DOMCI_DATA(ArchiveReader, ArchiveReader)