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nsStructuredCloneContainer.cpp
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nsStructuredCloneContainer.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sw=2 et 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 "nsIJSContextStack.h"
#include "nsIScriptContext.h"
#include "nsIVariant.h"
#include "nsServiceManagerUtils.h"
#include "nsContentUtils.h"
#include "mozilla/Base64.h"
using namespace mozilla;
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()
: mData(nullptr), mSize(0), mVersion(0)
{
}
nsStructuredCloneContainer::~nsStructuredCloneContainer()
{
free(mData);
}
nsresult
nsStructuredCloneContainer::InitFromVariant(nsIVariant *aData, JSContext *aCx)
{
NS_ENSURE_STATE(!mData);
NS_ENSURE_ARG_POINTER(aData);
NS_ENSURE_ARG_POINTER(aCx);
// First, try to extract a jsval from the variant |aData|. This works only
// if the variant implements GetAsJSVal.
jsval jsData;
nsresult rv = aData->GetAsJSVal(&jsData);
NS_ENSURE_SUCCESS(rv, NS_ERROR_UNEXPECTED);
// Make sure that we serialize in the right context.
JSAutoRequest ar(aCx);
JSAutoCompartment ac(aCx, JS_GetGlobalObject(aCx));
JS_WrapValue(aCx, &jsData);
nsCxPusher cxPusher;
cxPusher.Push(aCx);
uint64_t* jsBytes = nullptr;
bool success = JS_WriteStructuredClone(aCx, jsData, &jsBytes, &mSize,
nullptr, nullptr);
NS_ENSURE_STATE(success);
NS_ENSURE_STATE(jsBytes);
// Copy jsBytes into our own buffer.
mData = (uint64_t*) malloc(mSize);
if (!mData) {
mSize = 0;
mVersion = 0;
// FIXME This should really be js::Foreground::Free, but that's not public.
JS_free(aCx, jsBytes);
return NS_ERROR_FAILURE;
}
else {
mVersion = JS_STRUCTURED_CLONE_VERSION;
}
memcpy(mData, jsBytes, mSize);
// FIXME Similarly, this should be js::Foreground::free.
JS_free(aCx, jsBytes);
return NS_OK;
}
nsresult
nsStructuredCloneContainer::InitFromBase64(const nsAString &aData,
uint32_t aFormatVersion,
JSContext *aCx)
{
NS_ENSURE_STATE(!mData);
NS_ConvertUTF16toUTF8 data(aData);
nsCAutoString binaryData;
nsresult rv = Base64Decode(data, binaryData);
NS_ENSURE_SUCCESS(rv, rv);
// Copy the string's data into our own buffer.
mData = (uint64_t*) malloc(binaryData.Length());
NS_ENSURE_STATE(mData);
memcpy(mData, binaryData.get(), binaryData.Length());
mSize = binaryData.Length();
mVersion = aFormatVersion;
return NS_OK;
}
nsresult
nsStructuredCloneContainer::DeserializeToVariant(JSContext *aCx,
nsIVariant **aData)
{
NS_ENSURE_STATE(mData);
NS_ENSURE_ARG_POINTER(aData);
*aData = nullptr;
// Deserialize to a jsval.
jsval jsStateObj;
bool success = JS_ReadStructuredClone(aCx, mData, mSize, mVersion,
&jsStateObj, nullptr, nullptr);
NS_ENSURE_STATE(success);
// Now wrap the jsval as an nsIVariant.
nsCOMPtr<nsIVariant> varStateObj;
nsCOMPtr<nsIXPConnect> xpconnect = do_GetService(nsIXPConnect::GetCID());
NS_ENSURE_STATE(xpconnect);
xpconnect->JSValToVariant(aCx, &jsStateObj, getter_AddRefs(varStateObj));
NS_ENSURE_STATE(varStateObj);
NS_IF_ADDREF(*aData = varStateObj);
return NS_OK;
}
nsresult
nsStructuredCloneContainer::GetDataAsBase64(nsAString &aOut)
{
NS_ENSURE_STATE(mData);
aOut.Truncate();
nsCAutoString binaryData(reinterpret_cast<char*>(mData), mSize);
nsCAutoString base64Data;
nsresult rv = Base64Encode(binaryData, base64Data);
NS_ENSURE_SUCCESS(rv, rv);
aOut.Assign(NS_ConvertASCIItoUTF16(base64Data));
return NS_OK;
}
nsresult
nsStructuredCloneContainer::GetSerializedNBytes(uint64_t *aSize)
{
NS_ENSURE_STATE(mData);
NS_ENSURE_ARG_POINTER(aSize);
// mSize is a size_t, while aSize is a uint64_t. We rely on an implicit cast
// here so that we'll get a compile error if a size_t-to-uint64 cast is
// narrowing.
*aSize = mSize;
return NS_OK;
}
nsresult
nsStructuredCloneContainer::GetFormatVersion(uint32_t *aFormatVersion)
{
NS_ENSURE_STATE(mData);
NS_ENSURE_ARG_POINTER(aFormatVersion);
*aFormatVersion = mVersion;
return NS_OK;
}