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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/. */
#include "StructuredCloneData.h"
#include "ipc/IPCMessageUtilsSpecializations.h"
#include "mozilla/dom/BlobImpl.h"
#include "mozilla/dom/DOMTypes.h"
#include "mozilla/dom/IPCBlobUtils.h"
#include "mozilla/ipc/SerializedStructuredCloneBuffer.h"
#include "nsContentUtils.h"
using namespace mozilla::ipc;
namespace mozilla::dom::ipc {
StructuredCloneData::StructuredCloneData()
: StructuredCloneData(StructuredCloneScope::DifferentProcess,
StructuredCloneHolder::TransferringSupported) {}
StructuredCloneData::StructuredCloneData(
StructuredCloneScope aScope, TransferringSupport aSupportsTransferring)
: StructuredCloneHolder(StructuredCloneHolder::CloningSupported,
aSupportsTransferring, aScope) {
MOZ_ASSERT(aScope == StructuredCloneScope::DifferentProcess ||
aScope == StructuredCloneScope::UnknownDestination);
}
StructuredCloneData::~StructuredCloneData() = default;
void StructuredCloneData::WriteIPCParams(IPC::MessageWriter* aWriter) {
MOZ_RELEASE_ASSERT(
CloneScope() == StructuredCloneScope::DifferentProcess,
"Cannot serialize same-process StructuredCloneData over IPC");
AssertAttachmentsMatchFlags();
WriteParam(aWriter, BufferVersion());
WriteParam(aWriter, BufferData());
// Write all cloneable attachments directly to IPC.
std::apply([&](auto&... member) { WriteParams(aWriter, member...); },
CloneableAttachmentArrays());
// Also write all transferable members, if we support transferring.
if (SupportsTransferring()) {
std::apply([&](auto&... member) { WriteParams(aWriter, member...); },
TransferableAttachmentArrays());
}
}
bool StructuredCloneData::ReadIPCParams(IPC::MessageReader* aReader) {
MOZ_ASSERT(!mBuffer, "StructuredCloneData was previously initialized");
GeckoChildID originChildID =
aReader->GetActor()
? aReader->GetActor()->ToplevelProtocol()->OtherChildIDMaybeInvalid()
: kInvalidGeckoChildID;
uint32_t version;
JSStructuredCloneData data(JS::StructuredCloneScope::DifferentProcess);
if (!ReadParam(aReader, &version) || !ReadParam(aReader, &data)) {
return false;
}
Adopt(std::move(data), version, originChildID);
if (!std::apply(
[&](auto&... member) { return ReadParams(aReader, member...); },
CloneableAttachmentArrays())) {
return false;
}
if (SupportsTransferring()) {
if (!std::apply(
[&](auto&... member) { return ReadParams(aReader, member...); },
TransferableAttachmentArrays())) {
return false;
}
}
AssertAttachmentsMatchFlags();
return true;
}
bool StructuredCloneData::CopyExternalData(const char* aData,
size_t aDataLength,
uint32_t aVersion) {
MOZ_ASSERT(!mBuffer, "StructuredCloneData was previously initialized");
JSStructuredCloneData data(JS::StructuredCloneScope::DifferentProcess);
if (!data.AppendBytes(aData, aDataLength)) {
return false;
}
Adopt(std::move(data), aVersion);
return true;
}
} // namespace mozilla::dom::ipc
void IPC::ParamTraits<mozilla::dom::ipc::StructuredCloneData*>::Write(
MessageWriter* aWriter, paramType* aParam) {
WriteParam(aWriter, aParam != nullptr);
if (aParam) {
WriteParam(aWriter, aParam->SupportsTransferring());
aParam->WriteIPCParams(aWriter);
}
}
bool IPC::ParamTraits<mozilla::dom::ipc::StructuredCloneData*>::Read(
MessageReader* aReader, RefPtr<paramType>* aResult) {
bool notNull = false;
if (!ReadParam(aReader, ¬Null)) {
return false;
}
if (notNull) {
bool supportsTransferring;
if (!ReadParam(aReader, &supportsTransferring)) {
return false;
}
*aResult = mozilla::MakeRefPtr<paramType>(
JS::StructuredCloneScope::DifferentProcess,
supportsTransferring
? mozilla::dom::StructuredCloneHolder::TransferringSupported
: mozilla::dom::StructuredCloneHolder::TransferringNotSupported);
return (*aResult)->ReadIPCParams(aReader);
}
return true;
}
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