149 lines
3.5 KiB
C++
149 lines
3.5 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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#ifndef mozilla_dom_ipc_StructuredCloneData_h
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#define mozilla_dom_ipc_StructuredCloneData_h
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#include <algorithm>
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#include "mozilla/RefPtr.h"
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#include "mozilla/dom/StructuredCloneHolder.h"
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#include "nsISupportsImpl.h"
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namespace IPC {
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class Message;
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}
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namespace mozilla {
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namespace dom {
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namespace ipc {
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class SharedJSAllocatedData final
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{
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public:
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SharedJSAllocatedData(uint64_t* aData, size_t aDataLength)
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: mData(aData), mDataLength(aDataLength)
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{
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MOZ_ASSERT(mData);
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}
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static already_AddRefed<SharedJSAllocatedData>
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CreateFromExternalData(const void* aData, size_t aDataLength)
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{
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uint64_t* data = Allocate64bitSafely(aDataLength);
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if (!data) {
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return nullptr;
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}
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memcpy(data, aData, aDataLength);
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RefPtr<SharedJSAllocatedData> sharedData =
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new SharedJSAllocatedData(data, aDataLength);
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return sharedData.forget();
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}
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NS_INLINE_DECL_REFCOUNTING(SharedJSAllocatedData)
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uint64_t* Data() const { return mData; }
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size_t DataLength() const { return mDataLength; }
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private:
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~SharedJSAllocatedData()
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{
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js_free(mData);
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}
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static uint64_t*
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Allocate64bitSafely(size_t aSize)
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{
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// Structured cloning requires 64-bit aligment.
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return static_cast<uint64_t*>(js_malloc(std::max(sizeof(uint64_t), aSize)));
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}
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uint64_t* mData;
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size_t mDataLength;
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};
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class StructuredCloneData : public StructuredCloneHolder
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{
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public:
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StructuredCloneData()
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: StructuredCloneHolder(StructuredCloneHolder::CloningSupported,
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StructuredCloneHolder::TransferringNotSupported,
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StructuredCloneHolder::DifferentProcess)
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, mExternalData(nullptr)
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, mExternalDataLength(0)
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{}
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StructuredCloneData(const StructuredCloneData&) = delete;
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~StructuredCloneData()
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{
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MOZ_ASSERT(!(mExternalData && mSharedData));
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}
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StructuredCloneData&
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operator=(const StructuredCloneData& aOther) = delete;
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const nsTArray<RefPtr<BlobImpl>>& BlobImpls() const
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{
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return mBlobImplArray;
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}
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nsTArray<RefPtr<BlobImpl>>& BlobImpls()
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{
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return mBlobImplArray;
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}
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bool Copy(const StructuredCloneData& aData);
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void Read(JSContext* aCx,
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JS::MutableHandle<JS::Value> aValue,
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ErrorResult &aRv);
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void Write(JSContext* aCx,
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JS::Handle<JS::Value> aValue,
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ErrorResult &aRv);
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void UseExternalData(uint64_t* aData, size_t aDataLength)
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{
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MOZ_ASSERT(!Data());
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mExternalData = aData;
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mExternalDataLength = aDataLength;
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}
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bool CopyExternalData(const void* aData, size_t aDataLength);
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uint64_t* Data() const
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{
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return mSharedData ? mSharedData->Data() : mExternalData;
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}
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size_t DataLength() const
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{
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return mSharedData ? mSharedData->DataLength() : mExternalDataLength;
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}
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SharedJSAllocatedData* SharedData() const
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{
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return mSharedData;
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}
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// For IPC serialization
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void WriteIPCParams(IPC::Message* aMessage) const;
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bool ReadIPCParams(const IPC::Message* aMessage, void** aIter);
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private:
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uint64_t* MOZ_NON_OWNING_REF mExternalData;
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size_t mExternalDataLength;
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RefPtr<SharedJSAllocatedData> mSharedData;
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};
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} // namespace ipc
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} // namespace dom
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} // namespace mozilla
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#endif // mozilla_dom_ipc_StructuredCloneData_h
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