зеркало из https://github.com/mozilla/gecko-dev.git
904 строки
26 KiB
C++
904 строки
26 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "StructuredCloneHelper.h"
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#include "ImageContainer.h"
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#include "mozilla/AutoRestore.h"
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#include "mozilla/dom/BlobBinding.h"
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#include "mozilla/dom/File.h"
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#include "mozilla/dom/FileList.h"
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#include "mozilla/dom/FileListBinding.h"
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#include "mozilla/dom/ImageBitmap.h"
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#include "mozilla/dom/ImageBitmapBinding.h"
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#include "mozilla/dom/ImageData.h"
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#include "mozilla/dom/ImageDataBinding.h"
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#include "mozilla/dom/ipc/BlobChild.h"
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#include "mozilla/dom/StructuredClone.h"
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#include "mozilla/dom/MessagePort.h"
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#include "mozilla/dom/MessagePortBinding.h"
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#include "mozilla/dom/PMessagePort.h"
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#include "mozilla/dom/StructuredCloneTags.h"
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#include "mozilla/dom/ToJSValue.h"
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#include "mozilla/dom/WebCryptoCommon.h"
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#include "mozilla/ipc/BackgroundChild.h"
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#include "mozilla/ipc/BackgroundUtils.h"
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#include "MultipartBlobImpl.h"
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#include "nsFormData.h"
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#include "nsIRemoteBlob.h"
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#include "nsQueryObject.h"
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using namespace mozilla::ipc;
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namespace mozilla {
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namespace dom {
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namespace {
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JSObject*
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StructuredCloneCallbacksRead(JSContext* aCx,
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JSStructuredCloneReader* aReader,
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uint32_t aTag, uint32_t aIndex,
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void* aClosure)
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{
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StructuredCloneHelperInternal* helper =
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static_cast<StructuredCloneHelperInternal*>(aClosure);
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MOZ_ASSERT(helper);
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return helper->ReadCallback(aCx, aReader, aTag, aIndex);
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}
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bool
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StructuredCloneCallbacksWrite(JSContext* aCx,
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JSStructuredCloneWriter* aWriter,
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JS::Handle<JSObject*> aObj,
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void* aClosure)
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{
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StructuredCloneHelperInternal* helper =
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static_cast<StructuredCloneHelperInternal*>(aClosure);
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MOZ_ASSERT(helper);
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return helper->WriteCallback(aCx, aWriter, aObj);
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}
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bool
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StructuredCloneCallbacksReadTransfer(JSContext* aCx,
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JSStructuredCloneReader* aReader,
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uint32_t aTag,
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void* aContent,
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uint64_t aExtraData,
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void* aClosure,
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JS::MutableHandleObject aReturnObject)
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{
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StructuredCloneHelperInternal* helper =
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static_cast<StructuredCloneHelperInternal*>(aClosure);
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MOZ_ASSERT(helper);
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return helper->ReadTransferCallback(aCx, aReader, aTag, aContent,
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aExtraData, aReturnObject);
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}
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bool
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StructuredCloneCallbacksWriteTransfer(JSContext* aCx,
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JS::Handle<JSObject*> aObj,
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void* aClosure,
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// Output:
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uint32_t* aTag,
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JS::TransferableOwnership* aOwnership,
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void** aContent,
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uint64_t* aExtraData)
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{
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StructuredCloneHelperInternal* helper =
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static_cast<StructuredCloneHelperInternal*>(aClosure);
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MOZ_ASSERT(helper);
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return helper->WriteTransferCallback(aCx, aObj, aTag, aOwnership, aContent,
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aExtraData);
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}
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void
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StructuredCloneCallbacksFreeTransfer(uint32_t aTag,
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JS::TransferableOwnership aOwnership,
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void* aContent,
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uint64_t aExtraData,
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void* aClosure)
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{
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StructuredCloneHelperInternal* helper =
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static_cast<StructuredCloneHelperInternal*>(aClosure);
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MOZ_ASSERT(helper);
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return helper->FreeTransferCallback(aTag, aOwnership, aContent, aExtraData);
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}
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void
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StructuredCloneCallbacksError(JSContext* aCx,
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uint32_t aErrorId)
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{
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NS_WARNING("Failed to clone data.");
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}
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const JSStructuredCloneCallbacks gCallbacks = {
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StructuredCloneCallbacksRead,
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StructuredCloneCallbacksWrite,
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StructuredCloneCallbacksError,
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StructuredCloneCallbacksReadTransfer,
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StructuredCloneCallbacksWriteTransfer,
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StructuredCloneCallbacksFreeTransfer
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};
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} // anonymous namespace
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// StructuredCloneHelperInternal class
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StructuredCloneHelperInternal::StructuredCloneHelperInternal()
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#ifdef DEBUG
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: mShutdownCalled(false)
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#endif
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{}
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StructuredCloneHelperInternal::~StructuredCloneHelperInternal()
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{
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#ifdef DEBUG
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MOZ_ASSERT(mShutdownCalled);
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#endif
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}
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void
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StructuredCloneHelperInternal::Shutdown()
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{
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#ifdef DEBUG
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mShutdownCalled = true;
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#endif
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mBuffer = nullptr;
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}
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bool
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StructuredCloneHelperInternal::Write(JSContext* aCx,
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JS::Handle<JS::Value> aValue)
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{
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return Write(aCx, aValue, JS::UndefinedHandleValue);
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}
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bool
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StructuredCloneHelperInternal::Write(JSContext* aCx,
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JS::Handle<JS::Value> aValue,
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JS::Handle<JS::Value> aTransfer)
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{
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MOZ_ASSERT(!mBuffer, "Double Write is not allowed");
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MOZ_ASSERT(!mShutdownCalled, "This method cannot be called after Shutdown.");
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mBuffer = new JSAutoStructuredCloneBuffer(&gCallbacks, this);
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if (!mBuffer->write(aCx, aValue, aTransfer, &gCallbacks, this)) {
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mBuffer = nullptr;
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return false;
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}
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return true;
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}
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bool
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StructuredCloneHelperInternal::Read(JSContext* aCx,
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JS::MutableHandle<JS::Value> aValue)
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{
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MOZ_ASSERT(mBuffer, "Read() without Write() is not allowed.");
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MOZ_ASSERT(!mShutdownCalled, "This method cannot be called after Shutdown.");
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bool ok = mBuffer->read(aCx, aValue, &gCallbacks, this);
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return ok;
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}
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bool
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StructuredCloneHelperInternal::ReadTransferCallback(JSContext* aCx,
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JSStructuredCloneReader* aReader,
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uint32_t aTag,
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void* aContent,
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uint64_t aExtraData,
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JS::MutableHandleObject aReturnObject)
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{
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MOZ_CRASH("Nothing to read.");
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return false;
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}
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bool
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StructuredCloneHelperInternal::WriteTransferCallback(JSContext* aCx,
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JS::Handle<JSObject*> aObj,
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uint32_t* aTag,
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JS::TransferableOwnership* aOwnership,
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void** aContent,
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uint64_t* aExtraData)
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{
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// No transfers are supported by default.
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return false;
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}
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void
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StructuredCloneHelperInternal::FreeTransferCallback(uint32_t aTag,
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JS::TransferableOwnership aOwnership,
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void* aContent,
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uint64_t aExtraData)
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{
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MOZ_CRASH("Nothing to free.");
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}
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// StructuredCloneHelper class
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StructuredCloneHelper::StructuredCloneHelper(CloningSupport aSupportsCloning,
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TransferringSupport aSupportsTransferring,
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ContextSupport aContext)
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: mSupportsCloning(aSupportsCloning == CloningSupported)
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, mSupportsTransferring(aSupportsTransferring == TransferringSupported)
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, mContext(aContext)
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, mParent(nullptr)
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#ifdef DEBUG
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, mCreationThread(NS_GetCurrentThread())
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#endif
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{}
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StructuredCloneHelper::~StructuredCloneHelper()
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{
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Shutdown();
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MOZ_ASSERT(mTransferredPorts.IsEmpty());
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}
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void
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StructuredCloneHelper::Write(JSContext* aCx,
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JS::Handle<JS::Value> aValue,
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ErrorResult& aRv)
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{
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Write(aCx, aValue, JS::UndefinedHandleValue, aRv);
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}
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void
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StructuredCloneHelper::Write(JSContext* aCx,
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JS::Handle<JS::Value> aValue,
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JS::Handle<JS::Value> aTransfer,
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ErrorResult& aRv)
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{
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MOZ_ASSERT_IF(mContext == SameProcessSameThread,
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mCreationThread == NS_GetCurrentThread());
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if (!StructuredCloneHelperInternal::Write(aCx, aValue, aTransfer)) {
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aRv.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
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return;
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}
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if (mContext != SameProcessSameThread) {
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for (uint32_t i = 0, len = mBlobImplArray.Length(); i < len; ++i) {
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if (!mBlobImplArray[i]->MayBeClonedToOtherThreads()) {
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aRv.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
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return;
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}
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}
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}
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}
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void
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StructuredCloneHelper::Read(nsISupports* aParent,
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JSContext* aCx,
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JS::MutableHandle<JS::Value> aValue,
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ErrorResult& aRv)
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{
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MOZ_ASSERT_IF(mContext == SameProcessSameThread,
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mCreationThread == NS_GetCurrentThread());
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mozilla::AutoRestore<nsISupports*> guard(mParent);
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mParent = aParent;
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if (!StructuredCloneHelperInternal::Read(aCx, aValue)) {
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JS_ClearPendingException(aCx);
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aRv.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
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}
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// If we are tranferring something, we cannot call 'Read()' more than once.
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if (mSupportsTransferring) {
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mBlobImplArray.Clear();
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mClonedImages.Clear();
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Shutdown();
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}
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}
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void
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StructuredCloneHelper::ReadFromBuffer(nsISupports* aParent,
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JSContext* aCx,
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uint64_t* aBuffer,
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size_t aBufferLength,
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JS::MutableHandle<JS::Value> aValue,
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ErrorResult& aRv)
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{
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ReadFromBuffer(aParent, aCx, aBuffer, aBufferLength,
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JS_STRUCTURED_CLONE_VERSION, aValue, aRv);
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}
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void
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StructuredCloneHelper::ReadFromBuffer(nsISupports* aParent,
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JSContext* aCx,
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uint64_t* aBuffer,
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size_t aBufferLength,
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uint32_t aAlgorithmVersion,
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JS::MutableHandle<JS::Value> aValue,
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ErrorResult& aRv)
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{
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MOZ_ASSERT_IF(mContext == SameProcessSameThread,
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mCreationThread == NS_GetCurrentThread());
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MOZ_ASSERT(!mBuffer, "ReadFromBuffer() must be called without a Write().");
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MOZ_ASSERT(aBuffer);
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mozilla::AutoRestore<nsISupports*> guard(mParent);
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mParent = aParent;
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if (!JS_ReadStructuredClone(aCx, aBuffer, aBufferLength, aAlgorithmVersion,
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aValue, &gCallbacks, this)) {
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JS_ClearPendingException(aCx);
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aRv.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
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}
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}
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void
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StructuredCloneHelper::MoveBufferDataToArray(FallibleTArray<uint8_t>& aArray,
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ErrorResult& aRv)
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{
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MOZ_ASSERT_IF(mContext == SameProcessSameThread,
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mCreationThread == NS_GetCurrentThread());
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MOZ_ASSERT(mBuffer, "MoveBuffer() cannot be called without a Write().");
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if (NS_WARN_IF(!aArray.SetLength(BufferSize(), mozilla::fallible))) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return;
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}
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uint64_t* buffer;
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size_t size;
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mBuffer->steal(&buffer, &size);
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mBuffer = nullptr;
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memcpy(aArray.Elements(), buffer, size);
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js_free(buffer);
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}
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void
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StructuredCloneHelper::FreeBuffer(uint64_t* aBuffer,
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size_t aBufferLength)
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{
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MOZ_ASSERT(!mBuffer, "FreeBuffer() must be called without a Write().");
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MOZ_ASSERT(aBuffer);
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MOZ_ASSERT(aBufferLength);
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JS_ClearStructuredClone(aBuffer, aBufferLength, &gCallbacks, this, false);
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}
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namespace {
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// Recursive!
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already_AddRefed<BlobImpl>
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EnsureBlobForBackgroundManager(BlobImpl* aBlobImpl,
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PBackgroundChild* aManager = nullptr)
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{
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MOZ_ASSERT(aBlobImpl);
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if (!aManager) {
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aManager = BackgroundChild::GetForCurrentThread();
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MOZ_ASSERT(aManager);
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}
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nsRefPtr<BlobImpl> blobImpl = aBlobImpl;
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const nsTArray<nsRefPtr<BlobImpl>>* subBlobImpls =
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aBlobImpl->GetSubBlobImpls();
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if (!subBlobImpls || !subBlobImpls->Length()) {
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if (nsCOMPtr<nsIRemoteBlob> remoteBlob = do_QueryObject(blobImpl)) {
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// Always make sure we have a blob from an actor we can use on this
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// thread.
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BlobChild* blobChild = BlobChild::GetOrCreate(aManager, blobImpl);
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MOZ_ASSERT(blobChild);
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blobImpl = blobChild->GetBlobImpl();
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MOZ_ASSERT(blobImpl);
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DebugOnly<bool> isMutable;
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MOZ_ASSERT(NS_SUCCEEDED(blobImpl->GetMutable(&isMutable)));
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MOZ_ASSERT(!isMutable);
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} else {
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MOZ_ALWAYS_TRUE(NS_SUCCEEDED(blobImpl->SetMutable(false)));
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}
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return blobImpl.forget();
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}
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const uint32_t subBlobCount = subBlobImpls->Length();
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MOZ_ASSERT(subBlobCount);
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nsTArray<nsRefPtr<BlobImpl>> newSubBlobImpls;
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newSubBlobImpls.SetLength(subBlobCount);
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bool newBlobImplNeeded = false;
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for (uint32_t index = 0; index < subBlobCount; index++) {
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const nsRefPtr<BlobImpl>& subBlobImpl = subBlobImpls->ElementAt(index);
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MOZ_ASSERT(subBlobImpl);
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nsRefPtr<BlobImpl>& newSubBlobImpl = newSubBlobImpls[index];
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newSubBlobImpl = EnsureBlobForBackgroundManager(subBlobImpl, aManager);
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MOZ_ASSERT(newSubBlobImpl);
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if (subBlobImpl != newSubBlobImpl) {
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newBlobImplNeeded = true;
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}
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}
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if (newBlobImplNeeded) {
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nsString contentType;
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blobImpl->GetType(contentType);
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if (blobImpl->IsFile()) {
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nsString name;
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blobImpl->GetName(name);
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blobImpl = new MultipartBlobImpl(newSubBlobImpls, name, contentType);
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} else {
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blobImpl = new MultipartBlobImpl(newSubBlobImpls, contentType);
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}
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MOZ_ALWAYS_TRUE(NS_SUCCEEDED(blobImpl->SetMutable(false)));
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}
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return blobImpl.forget();
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}
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JSObject*
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ReadBlob(JSContext* aCx,
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uint32_t aIndex,
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StructuredCloneHelper* aHelper)
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{
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MOZ_ASSERT(aHelper);
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MOZ_ASSERT(aIndex < aHelper->BlobImpls().Length());
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nsRefPtr<BlobImpl> blobImpl = aHelper->BlobImpls()[aIndex];
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blobImpl = EnsureBlobForBackgroundManager(blobImpl);
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MOZ_ASSERT(blobImpl);
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// nsRefPtr<File> needs to go out of scope before toObjectOrNull() is
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// called because the static analysis thinks dereferencing XPCOM objects
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// can GC (because in some cases it can!), and a return statement with a
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// JSObject* type means that JSObject* is on the stack as a raw pointer
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// while destructors are running.
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JS::Rooted<JS::Value> val(aCx);
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{
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nsRefPtr<Blob> blob = Blob::Create(aHelper->ParentDuringRead(), blobImpl);
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if (!ToJSValue(aCx, blob, &val)) {
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return nullptr;
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}
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}
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return &val.toObject();
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}
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bool
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WriteBlob(JSStructuredCloneWriter* aWriter,
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Blob* aBlob,
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StructuredCloneHelper* aHelper)
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{
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MOZ_ASSERT(aWriter);
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MOZ_ASSERT(aBlob);
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MOZ_ASSERT(aHelper);
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nsRefPtr<BlobImpl> blobImpl = EnsureBlobForBackgroundManager(aBlob->Impl());
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MOZ_ASSERT(blobImpl);
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// We store the position of the blobImpl in the array as index.
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if (JS_WriteUint32Pair(aWriter, SCTAG_DOM_BLOB,
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aHelper->BlobImpls().Length())) {
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aHelper->BlobImpls().AppendElement(blobImpl);
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return true;
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}
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return false;
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}
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// Read the WriteFileList for the format.
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JSObject*
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ReadFileList(JSContext* aCx,
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JSStructuredCloneReader* aReader,
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uint32_t aCount,
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StructuredCloneHelper* aHelper)
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{
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MOZ_ASSERT(aCx);
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MOZ_ASSERT(aReader);
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JS::Rooted<JS::Value> val(aCx);
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{
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nsRefPtr<FileList> fileList = new FileList(aHelper->ParentDuringRead());
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uint32_t tag, offset;
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// Offset is the index of the blobImpl from which we can find the blobImpl
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// for this FileList.
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if (!JS_ReadUint32Pair(aReader, &tag, &offset)) {
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return nullptr;
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}
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MOZ_ASSERT(tag == 0);
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// |aCount| is the number of BlobImpls to use from the |offset|.
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for (uint32_t i = 0; i < aCount; ++i) {
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uint32_t index = offset + i;
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MOZ_ASSERT(index < aHelper->BlobImpls().Length());
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nsRefPtr<BlobImpl> blobImpl = aHelper->BlobImpls()[index];
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MOZ_ASSERT(blobImpl->IsFile());
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blobImpl = EnsureBlobForBackgroundManager(blobImpl);
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MOZ_ASSERT(blobImpl);
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|
|
|
nsRefPtr<File> file = File::Create(aHelper->ParentDuringRead(), blobImpl);
|
|
if (!fileList->Append(file)) {
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
if (!ToJSValue(aCx, fileList, &val)) {
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
return &val.toObject();
|
|
}
|
|
|
|
// The format of the FileList serialization is:
|
|
// - pair of ints: SCTAG_DOM_FILELIST, Length of the FileList
|
|
// - pair of ints: 0, The offset of the BlobImpl array
|
|
bool
|
|
WriteFileList(JSStructuredCloneWriter* aWriter,
|
|
FileList* aFileList,
|
|
StructuredCloneHelper* aHelper)
|
|
{
|
|
MOZ_ASSERT(aWriter);
|
|
MOZ_ASSERT(aFileList);
|
|
MOZ_ASSERT(aHelper);
|
|
|
|
// A FileList is serialized writing the X number of elements and the offset
|
|
// from mBlobImplArray. The Read will take X elements from mBlobImplArray
|
|
// starting from the offset.
|
|
if (!JS_WriteUint32Pair(aWriter, SCTAG_DOM_FILELIST,
|
|
aFileList->Length()) ||
|
|
!JS_WriteUint32Pair(aWriter, 0,
|
|
aHelper->BlobImpls().Length())) {
|
|
return false;
|
|
}
|
|
|
|
for (uint32_t i = 0; i < aFileList->Length(); ++i) {
|
|
nsRefPtr<BlobImpl> blobImpl =
|
|
EnsureBlobForBackgroundManager(aFileList->Item(i)->Impl());
|
|
MOZ_ASSERT(blobImpl);
|
|
|
|
aHelper->BlobImpls().AppendElement(blobImpl);
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
// Read the WriteFormData for the format.
|
|
JSObject*
|
|
ReadFormData(JSContext* aCx,
|
|
JSStructuredCloneReader* aReader,
|
|
uint32_t aCount,
|
|
StructuredCloneHelper* aHelper)
|
|
{
|
|
MOZ_ASSERT(aCx);
|
|
MOZ_ASSERT(aReader);
|
|
MOZ_ASSERT(aHelper);
|
|
|
|
// See the serialization of the FormData for the format.
|
|
JS::Rooted<JS::Value> val(aCx);
|
|
{
|
|
nsRefPtr<nsFormData> formData =
|
|
new nsFormData(aHelper->ParentDuringRead());
|
|
|
|
Optional<nsAString> thirdArg;
|
|
for (uint32_t i = 0; i < aCount; ++i) {
|
|
nsAutoString name;
|
|
if (!ReadString(aReader, name)) {
|
|
return nullptr;
|
|
}
|
|
|
|
uint32_t tag, indexOrLengthOfString;
|
|
if (!JS_ReadUint32Pair(aReader, &tag, &indexOrLengthOfString)) {
|
|
return nullptr;
|
|
}
|
|
|
|
if (tag == SCTAG_DOM_BLOB) {
|
|
MOZ_ASSERT(indexOrLengthOfString < aHelper->BlobImpls().Length());
|
|
|
|
nsRefPtr<BlobImpl> blobImpl =
|
|
aHelper->BlobImpls()[indexOrLengthOfString];
|
|
MOZ_ASSERT(blobImpl->IsFile());
|
|
|
|
nsRefPtr<File> file =
|
|
File::Create(aHelper->ParentDuringRead(), blobImpl);
|
|
MOZ_ASSERT(file);
|
|
|
|
formData->Append(name, *file, thirdArg);
|
|
} else {
|
|
MOZ_ASSERT(tag == 0);
|
|
|
|
nsAutoString value;
|
|
value.SetLength(indexOrLengthOfString);
|
|
size_t charSize = sizeof(nsString::char_type);
|
|
if (!JS_ReadBytes(aReader, (void*) value.BeginWriting(),
|
|
indexOrLengthOfString * charSize)) {
|
|
return nullptr;
|
|
}
|
|
|
|
formData->Append(name, value);
|
|
}
|
|
}
|
|
|
|
if (!ToJSValue(aCx, formData, &val)) {
|
|
return nullptr;
|
|
}
|
|
}
|
|
|
|
return &val.toObject();
|
|
}
|
|
|
|
// The format of the FormData serialization is:
|
|
// - pair of ints: SCTAG_DOM_FORMDATA, Length of the FormData elements
|
|
// - for each Element element:
|
|
// - name string
|
|
// - if it's a blob:
|
|
// - pair of ints: SCTAG_DOM_BLOB, index of the BlobImpl in the array
|
|
// mBlobImplArray.
|
|
// - else:
|
|
// - pair of ints: 0, string length
|
|
// - value string
|
|
bool
|
|
WriteFormData(JSStructuredCloneWriter* aWriter,
|
|
nsFormData* aFormData,
|
|
StructuredCloneHelper* aHelper)
|
|
{
|
|
MOZ_ASSERT(aWriter);
|
|
MOZ_ASSERT(aFormData);
|
|
MOZ_ASSERT(aHelper);
|
|
|
|
if (!JS_WriteUint32Pair(aWriter, SCTAG_DOM_FORMDATA,
|
|
aFormData->Length())) {
|
|
return false;
|
|
}
|
|
|
|
class MOZ_STACK_CLASS Closure final
|
|
{
|
|
JSStructuredCloneWriter* mWriter;
|
|
StructuredCloneHelper* mHelper;
|
|
|
|
public:
|
|
Closure(JSStructuredCloneWriter* aWriter,
|
|
StructuredCloneHelper* aHelper)
|
|
: mWriter(aWriter),
|
|
mHelper(aHelper)
|
|
{ }
|
|
|
|
static bool
|
|
Write(const nsString& aName, bool isFile, const nsString& aValue,
|
|
File* aFile, void* aClosure)
|
|
{
|
|
Closure* closure = static_cast<Closure*>(aClosure);
|
|
if (!WriteString(closure->mWriter, aName)) {
|
|
return false;
|
|
}
|
|
|
|
if (isFile) {
|
|
BlobImpl* blobImpl = aFile->Impl();
|
|
if (!JS_WriteUint32Pair(closure->mWriter, SCTAG_DOM_BLOB,
|
|
closure->mHelper->BlobImpls().Length())) {
|
|
return false;
|
|
}
|
|
|
|
closure->mHelper->BlobImpls().AppendElement(blobImpl);
|
|
return true;
|
|
}
|
|
|
|
size_t charSize = sizeof(nsString::char_type);
|
|
if (!JS_WriteUint32Pair(closure->mWriter, 0, aValue.Length()) ||
|
|
!JS_WriteBytes(closure->mWriter, aValue.get(),
|
|
aValue.Length() * charSize)) {
|
|
return false;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
};
|
|
Closure closure(aWriter, aHelper);
|
|
return aFormData->ForEach(Closure::Write, &closure);
|
|
}
|
|
|
|
} // anonymous namespace
|
|
|
|
JSObject*
|
|
StructuredCloneHelper::ReadCallback(JSContext* aCx,
|
|
JSStructuredCloneReader* aReader,
|
|
uint32_t aTag,
|
|
uint32_t aIndex)
|
|
{
|
|
MOZ_ASSERT(mSupportsCloning);
|
|
|
|
if (aTag == SCTAG_DOM_BLOB) {
|
|
return ReadBlob(aCx, aIndex, this);
|
|
}
|
|
|
|
if (aTag == SCTAG_DOM_FILELIST) {
|
|
return ReadFileList(aCx, aReader, aIndex, this);
|
|
}
|
|
|
|
if (aTag == SCTAG_DOM_IMAGEDATA) {
|
|
return ReadStructuredCloneImageData(aCx, aReader);
|
|
}
|
|
|
|
if (aTag == SCTAG_DOM_FORMDATA) {
|
|
return ReadFormData(aCx, aReader, aIndex, this);
|
|
}
|
|
|
|
if (aTag == SCTAG_DOM_IMAGEBITMAP) {
|
|
MOZ_ASSERT(mContext == SameProcessSameThread ||
|
|
mContext == SameProcessDifferentThread);
|
|
|
|
// Get the current global object.
|
|
// This can be null.
|
|
nsCOMPtr<nsIGlobalObject> parent = do_QueryInterface(mParent);
|
|
// aIndex is the index of the cloned image.
|
|
return ImageBitmap::ReadStructuredClone(aCx, aReader,
|
|
parent, GetImages(), aIndex);
|
|
}
|
|
|
|
return NS_DOMReadStructuredClone(aCx, aReader, aTag, aIndex, nullptr);
|
|
}
|
|
|
|
bool
|
|
StructuredCloneHelper::WriteCallback(JSContext* aCx,
|
|
JSStructuredCloneWriter* aWriter,
|
|
JS::Handle<JSObject*> aObj)
|
|
{
|
|
if (!mSupportsCloning) {
|
|
return false;
|
|
}
|
|
|
|
// See if this is a File/Blob object.
|
|
{
|
|
Blob* blob = nullptr;
|
|
if (NS_SUCCEEDED(UNWRAP_OBJECT(Blob, aObj, blob))) {
|
|
return WriteBlob(aWriter, blob, this);
|
|
}
|
|
}
|
|
|
|
// See if this is a FileList object.
|
|
{
|
|
FileList* fileList = nullptr;
|
|
if (NS_SUCCEEDED(UNWRAP_OBJECT(FileList, aObj, fileList))) {
|
|
return WriteFileList(aWriter, fileList, this);
|
|
}
|
|
}
|
|
|
|
// See if this is a ImageData object.
|
|
{
|
|
ImageData* imageData = nullptr;
|
|
if (NS_SUCCEEDED(UNWRAP_OBJECT(ImageData, aObj, imageData))) {
|
|
return WriteStructuredCloneImageData(aCx, aWriter, imageData);
|
|
}
|
|
}
|
|
|
|
// See if this is a FormData object.
|
|
{
|
|
nsFormData* formData = nullptr;
|
|
if (NS_SUCCEEDED(UNWRAP_OBJECT(FormData, aObj, formData))) {
|
|
return WriteFormData(aWriter, formData, this);
|
|
}
|
|
}
|
|
|
|
// See if this is an ImageBitmap object.
|
|
if (mContext == SameProcessSameThread ||
|
|
mContext == SameProcessDifferentThread) {
|
|
ImageBitmap* imageBitmap = nullptr;
|
|
if (NS_SUCCEEDED(UNWRAP_OBJECT(ImageBitmap, aObj, imageBitmap))) {
|
|
return ImageBitmap::WriteStructuredClone(aWriter,
|
|
GetImages(),
|
|
imageBitmap);
|
|
}
|
|
}
|
|
|
|
return NS_DOMWriteStructuredClone(aCx, aWriter, aObj, nullptr);
|
|
}
|
|
|
|
bool
|
|
StructuredCloneHelper::ReadTransferCallback(JSContext* aCx,
|
|
JSStructuredCloneReader* aReader,
|
|
uint32_t aTag,
|
|
void* aContent,
|
|
uint64_t aExtraData,
|
|
JS::MutableHandleObject aReturnObject)
|
|
{
|
|
MOZ_ASSERT(mSupportsTransferring);
|
|
|
|
if (aTag == SCTAG_DOM_MAP_MESSAGEPORT) {
|
|
// This can be null.
|
|
nsCOMPtr<nsPIDOMWindow> window = do_QueryInterface(mParent);
|
|
|
|
MOZ_ASSERT(aExtraData < mPortIdentifiers.Length());
|
|
const MessagePortIdentifier& portIdentifier = mPortIdentifiers[aExtraData];
|
|
|
|
// aExtraData is the index of this port identifier.
|
|
ErrorResult rv;
|
|
nsRefPtr<MessagePort> port =
|
|
MessagePort::Create(window, portIdentifier, rv);
|
|
if (NS_WARN_IF(rv.Failed())) {
|
|
return false;
|
|
}
|
|
|
|
mTransferredPorts.AppendElement(port);
|
|
|
|
JS::Rooted<JS::Value> value(aCx);
|
|
if (!GetOrCreateDOMReflector(aCx, port, &value)) {
|
|
JS_ClearPendingException(aCx);
|
|
return false;
|
|
}
|
|
|
|
aReturnObject.set(&value.toObject());
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
bool
|
|
StructuredCloneHelper::WriteTransferCallback(JSContext* aCx,
|
|
JS::Handle<JSObject*> aObj,
|
|
uint32_t* aTag,
|
|
JS::TransferableOwnership* aOwnership,
|
|
void** aContent,
|
|
uint64_t* aExtraData)
|
|
{
|
|
if (!mSupportsTransferring) {
|
|
return false;
|
|
}
|
|
|
|
{
|
|
MessagePortBase* port = nullptr;
|
|
nsresult rv = UNWRAP_OBJECT(MessagePort, aObj, port);
|
|
if (NS_SUCCEEDED(rv)) {
|
|
// We use aExtraData to store the index of this new port identifier.
|
|
*aExtraData = mPortIdentifiers.Length();
|
|
MessagePortIdentifier* identifier = mPortIdentifiers.AppendElement();
|
|
|
|
if (!port->CloneAndDisentangle(*identifier)) {
|
|
return false;
|
|
}
|
|
|
|
*aTag = SCTAG_DOM_MAP_MESSAGEPORT;
|
|
*aOwnership = JS::SCTAG_TMO_CUSTOM;
|
|
*aContent = nullptr;
|
|
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
void
|
|
StructuredCloneHelper::FreeTransferCallback(uint32_t aTag,
|
|
JS::TransferableOwnership aOwnership,
|
|
void* aContent,
|
|
uint64_t aExtraData)
|
|
{
|
|
MOZ_ASSERT(mSupportsTransferring);
|
|
|
|
if (aTag == SCTAG_DOM_MAP_MESSAGEPORT) {
|
|
MOZ_ASSERT(!aContent);
|
|
MOZ_ASSERT(aExtraData < mPortIdentifiers.Length());
|
|
MessagePort::ForceClose(mPortIdentifiers[aExtraData]);
|
|
}
|
|
}
|
|
|
|
} // dom namespace
|
|
} // mozilla namespace
|