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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=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/. */
#ifndef mozilla_dom_ipc_StructuredCloneData_h
#define mozilla_dom_ipc_StructuredCloneData_h
#include <algorithm>
#include "mozilla/RefPtr.h"
#include "mozilla/dom/StructuredCloneHolder.h"
#include "nsISupportsImpl.h"
namespace IPC {
class Message;
}
class PickleIterator;
namespace mozilla {
namespace dom {
namespace ipc {
class SharedJSAllocatedData final
{
public:
explicit SharedJSAllocatedData(JSStructuredCloneData&& aData)
: mData(Move(aData))
{ }
static already_AddRefed<SharedJSAllocatedData>
CreateFromExternalData(const char* aData, size_t aDataLength)
{
JSStructuredCloneData buf;
buf.WriteBytes(aData, aDataLength);
RefPtr<SharedJSAllocatedData> sharedData =
new SharedJSAllocatedData(Move(buf));
return sharedData.forget();
}
static already_AddRefed<SharedJSAllocatedData>
CreateFromExternalData(const JSStructuredCloneData& aData)
{
JSStructuredCloneData buf;
auto iter = aData.Iter();
while (!iter.Done()) {
buf.WriteBytes(iter.Data(), iter.RemainingInSegment());
iter.Advance(aData, iter.RemainingInSegment());
}
RefPtr<SharedJSAllocatedData> sharedData =
new SharedJSAllocatedData(Move(buf));
return sharedData.forget();
}
NS_INLINE_DECL_REFCOUNTING(SharedJSAllocatedData)
JSStructuredCloneData& Data() { return mData; }
size_t DataLength() const { return mData.Size(); }
private:
~SharedJSAllocatedData() { }
JSStructuredCloneData mData;
};
class StructuredCloneData : public StructuredCloneHolder
{
public:
StructuredCloneData()
: StructuredCloneHolder(StructuredCloneHolder::CloningSupported,
StructuredCloneHolder::TransferringSupported,
StructuredCloneHolder::StructuredCloneScope::DifferentProcess)
, mInitialized(false)
{}
StructuredCloneData(const StructuredCloneData&) = delete;
StructuredCloneData(StructuredCloneData&& aOther) = default;
~StructuredCloneData()
{}
StructuredCloneData&
operator=(const StructuredCloneData& aOther) = delete;
StructuredCloneData&
operator=(StructuredCloneData&& aOther) = default;
const nsTArray<RefPtr<BlobImpl>>& BlobImpls() const
{
return mBlobImplArray;
}
nsTArray<RefPtr<BlobImpl>>& BlobImpls()
{
return mBlobImplArray;
}
bool Copy(const StructuredCloneData& aData);
void Read(JSContext* aCx,
JS::MutableHandle<JS::Value> aValue,
ErrorResult &aRv);
void Write(JSContext* aCx,
JS::Handle<JS::Value> aValue,
ErrorResult &aRv);
void Write(JSContext* aCx,
JS::Handle<JS::Value> aValue,
JS::Handle<JS::Value> aTransfers,
ErrorResult &aRv);
bool UseExternalData(const JSStructuredCloneData& aData)
{
auto iter = aData.Iter();
bool success = false;
mExternalData =
aData.Borrow<js::SystemAllocPolicy>(iter, aData.Size(), &success);
mInitialized = true;
return success;
}
bool CopyExternalData(const char* aData, size_t aDataLength);
JSStructuredCloneData& Data()
{
return mSharedData ? mSharedData->Data() : mExternalData;
}
const JSStructuredCloneData& Data() const
{
return mSharedData ? mSharedData->Data() : mExternalData;
}
size_t DataLength() const
{
return mSharedData ? mSharedData->DataLength() : mExternalData.Size();
}
SharedJSAllocatedData* SharedData() const
{
return mSharedData;
}
// For IPC serialization
void WriteIPCParams(IPC::Message* aMessage) const;
bool ReadIPCParams(const IPC::Message* aMessage, PickleIterator* aIter);
private:
JSStructuredCloneData mExternalData;
RefPtr<SharedJSAllocatedData> mSharedData;
bool mInitialized;
};
} // namespace ipc
} // namespace dom
} // namespace mozilla
#endif // mozilla_dom_ipc_StructuredCloneData_h
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