gecko-dev/dom/ipc/StructuredCloneData.cpp
Morris Tseng 8181a0e4ec Bug 1215438 - Part 2: Add transfer support for ImageBitmap. r=baku
--HG--
extra : commitid : 79U2wpZIJ6W
2015-12-18 14:52:16 +08:00

139 lines
3.5 KiB
C++

/* -*- 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 "nsIDOMDOMException.h"
#include "nsIMutable.h"
#include "nsIXPConnect.h"
#include "ipc/IPCMessageUtils.h"
#include "mozilla/dom/BindingUtils.h"
#include "mozilla/dom/BlobBinding.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/ToJSValue.h"
#include "nsContentUtils.h"
#include "nsJSEnvironment.h"
#include "MainThreadUtils.h"
#include "StructuredCloneTags.h"
#include "jsapi.h"
namespace mozilla {
namespace dom {
namespace ipc {
bool
StructuredCloneData::Copy(const StructuredCloneData& aData)
{
if (!aData.Data()) {
return true;
}
if (aData.SharedData()) {
mSharedData = aData.SharedData();
} else {
mSharedData =
SharedJSAllocatedData::CreateFromExternalData(aData.Data(),
aData.DataLength());
NS_ENSURE_TRUE(mSharedData, false);
}
MOZ_ASSERT(BlobImpls().IsEmpty());
BlobImpls().AppendElements(aData.BlobImpls());
MOZ_ASSERT(GetSurfaces().IsEmpty());
return true;
}
void
StructuredCloneData::Read(JSContext* aCx,
JS::MutableHandle<JS::Value> aValue,
ErrorResult &aRv)
{
MOZ_ASSERT(Data());
nsIGlobalObject *global = xpc::NativeGlobal(JS::CurrentGlobalOrNull(aCx));
MOZ_ASSERT(global);
ReadFromBuffer(global, aCx, Data(), DataLength(), aValue, aRv);
}
void
StructuredCloneData::Write(JSContext* aCx,
JS::Handle<JS::Value> aValue,
ErrorResult &aRv)
{
MOZ_ASSERT(!Data());
StructuredCloneHolder::Write(aCx, aValue, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
uint64_t* data = nullptr;
size_t dataLength = 0;
mBuffer->steal(&data, &dataLength);
mBuffer = nullptr;
mSharedData = new SharedJSAllocatedData(data, dataLength);
}
void
StructuredCloneData::WriteIPCParams(IPC::Message* aMsg) const
{
WriteParam(aMsg, DataLength());
if (DataLength()) {
// Structured clone data must be 64-bit aligned.
aMsg->WriteBytes(Data(), DataLength(), sizeof(uint64_t));
}
}
bool
StructuredCloneData::ReadIPCParams(const IPC::Message* aMsg,
void** aIter)
{
MOZ_ASSERT(!Data());
size_t dataLength = 0;
if (!ReadParam(aMsg, aIter, &dataLength)) {
return false;
}
if (!dataLength) {
return true;
}
uint64_t* dataBuffer = nullptr;
const char** buffer =
const_cast<const char**>(reinterpret_cast<char**>(&dataBuffer));
// Structured clone data must be 64-bit aligned.
if (!aMsg->ReadBytes(aIter, buffer, dataLength, sizeof(uint64_t))) {
return false;
}
mSharedData = SharedJSAllocatedData::CreateFromExternalData(dataBuffer,
dataLength);
NS_ENSURE_TRUE(mSharedData, false);
return true;
}
bool
StructuredCloneData::CopyExternalData(const void* aData,
size_t aDataLength)
{
MOZ_ASSERT(!Data());
mSharedData = SharedJSAllocatedData::CreateFromExternalData(aData,
aDataLength);
NS_ENSURE_TRUE(mSharedData, false);
return true;
}
} // namespace ipc
} // namespace dom
} // namespace mozilla