gecko-dev/dom/base/nsStructuredCloneContainer.cpp

178 строки
4.4 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 "nsStructuredCloneContainer.h"
#include "nsCOMPtr.h"
#include "nsIGlobalObject.h"
#include "nsIVariant.h"
#include "nsIXPConnect.h"
#include "nsServiceManagerUtils.h"
#include "nsContentUtils.h"
#include "jsapi.h"
#include "xpcpublic.h"
#include "mozilla/Base64.h"
#include "mozilla/dom/ScriptSettings.h"
using namespace mozilla;
using namespace mozilla::dom;
NS_IMPL_ADDREF(nsStructuredCloneContainer)
NS_IMPL_RELEASE(nsStructuredCloneContainer)
NS_INTERFACE_MAP_BEGIN(nsStructuredCloneContainer)
NS_INTERFACE_MAP_ENTRY(nsIStructuredCloneContainer)
NS_INTERFACE_MAP_ENTRY(nsISupports)
NS_INTERFACE_MAP_END
nsStructuredCloneContainer::nsStructuredCloneContainer() : mVersion(0) {}
nsStructuredCloneContainer::~nsStructuredCloneContainer() = default;
NS_IMETHODIMP
nsStructuredCloneContainer::InitFromJSVal(JS::Handle<JS::Value> aData,
JSContext* aCx) {
if (DataLength()) {
return NS_ERROR_FAILURE;
}
ErrorResult rv;
Write(aCx, aData, rv);
if (NS_WARN_IF(rv.Failed())) {
// XXX propagate the error message as well.
// We cannot StealNSResult because we threw a DOM exception.
rv.SuppressException();
return NS_ERROR_DOM_DATA_CLONE_ERR;
}
mVersion = JS_STRUCTURED_CLONE_VERSION;
return NS_OK;
}
NS_IMETHODIMP
nsStructuredCloneContainer::InitFromBase64(const nsAString& aData,
uint32_t aFormatVersion) {
if (DataLength()) {
return NS_ERROR_FAILURE;
}
NS_ConvertUTF16toUTF8 data(aData);
nsAutoCString binaryData;
nsresult rv = Base64Decode(data, binaryData);
NS_ENSURE_SUCCESS(rv, rv);
if (!CopyExternalData(binaryData.get(), binaryData.Length())) {
return NS_ERROR_OUT_OF_MEMORY;
}
mVersion = aFormatVersion;
return NS_OK;
}
nsresult nsStructuredCloneContainer::DeserializeToJsval(
JSContext* aCx, JS::MutableHandle<JS::Value> aValue) {
aValue.setNull();
JS::Rooted<JS::Value> jsStateObj(aCx);
ErrorResult rv;
Read(aCx, &jsStateObj, rv);
if (NS_WARN_IF(rv.Failed())) {
// XXX propagate the error message as well.
// We cannot StealNSResult because we threw a DOM exception.
rv.SuppressException();
return NS_ERROR_DOM_DATA_CLONE_ERR;
}
aValue.set(jsStateObj);
return NS_OK;
}
NS_IMETHODIMP
nsStructuredCloneContainer::DeserializeToVariant(JSContext* aCx,
nsIVariant** aData) {
NS_ENSURE_ARG_POINTER(aData);
*aData = nullptr;
if (!DataLength()) {
return NS_ERROR_FAILURE;
}
// Deserialize to a JS::Value.
JS::Rooted<JS::Value> jsStateObj(aCx);
nsresult rv = DeserializeToJsval(aCx, &jsStateObj);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
// Now wrap the JS::Value as an nsIVariant.
nsCOMPtr<nsIVariant> varStateObj;
nsCOMPtr<nsIXPConnect> xpconnect = nsIXPConnect::XPConnect();
NS_ENSURE_STATE(xpconnect);
xpconnect->JSValToVariant(aCx, jsStateObj, getter_AddRefs(varStateObj));
NS_ENSURE_STATE(varStateObj);
varStateObj.forget(aData);
return NS_OK;
}
NS_IMETHODIMP
nsStructuredCloneContainer::GetDataAsBase64(nsAString& aOut) {
aOut.Truncate();
if (!DataLength()) {
return NS_ERROR_FAILURE;
}
if (HasClonedDOMObjects()) {
return NS_ERROR_FAILURE;
}
auto iter = Data().Start();
size_t size = Data().Size();
nsAutoCString binaryData;
binaryData.SetLength(size);
if (!Data().ReadBytes(iter, binaryData.BeginWriting(), size)) {
return NS_ERROR_OUT_OF_MEMORY;
}
nsAutoCString base64Data;
nsresult rv = Base64Encode(binaryData, base64Data);
if (NS_WARN_IF(NS_FAILED(rv))) {
return rv;
}
if (!CopyASCIItoUTF16(base64Data, aOut, fallible)) {
return NS_ERROR_OUT_OF_MEMORY;
}
return NS_OK;
}
NS_IMETHODIMP
nsStructuredCloneContainer::GetSerializedNBytes(uint64_t* aSize) {
NS_ENSURE_ARG_POINTER(aSize);
if (!DataLength()) {
return NS_ERROR_FAILURE;
}
*aSize = DataLength();
return NS_OK;
}
NS_IMETHODIMP
nsStructuredCloneContainer::GetFormatVersion(uint32_t* aFormatVersion) {
NS_ENSURE_ARG_POINTER(aFormatVersion);
if (!DataLength()) {
return NS_ERROR_FAILURE;
}
*aFormatVersion = mVersion;
return NS_OK;
}