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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* vim: set sw=4 ts=8 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 "StructuredCloneUtils.h"
#include "nsIDOMFile.h"
#include "nsIDOMDOMException.h"
#include "nsIMutable.h"
#include "nsIXPConnect.h"
#include "nsContentUtils.h"
#include "nsJSEnvironment.h"
#include "nsThreadUtils.h"
#include "StructuredCloneTags.h"
using namespace mozilla::dom;
namespace {
void
Error(JSContext* aCx, uint32_t aErrorId)
{
MOZ_ASSERT(NS_IsMainThread());
NS_DOMStructuredCloneError(aCx, aErrorId);
}
JSObject*
Read(JSContext* aCx, JSStructuredCloneReader* aReader, uint32_t aTag,
uint32_t aData, void* aClosure)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aClosure);
StructuredCloneClosure* closure =
static_cast<StructuredCloneClosure*>(aClosure);
if (aTag == SCTAG_DOM_FILE) {
MOZ_ASSERT(aData < closure->mBlobs.Length());
nsCOMPtr<nsIDOMFile> file = do_QueryInterface(closure->mBlobs[aData]);
MOZ_ASSERT(file);
#ifdef DEBUG
{
// File should not be mutable.
nsCOMPtr<nsIMutable> mutableFile = do_QueryInterface(file);
bool isMutable;
if (NS_FAILED(mutableFile->GetMutable(&isMutable))) {
MOZ_NOT_REACHED("GetMutable failed!");
}
else {
MOZ_ASSERT(!isMutable);
}
}
#endif
jsval wrappedFile;
nsresult rv =
nsContentUtils::WrapNative(aCx, JS_GetGlobalForScopeChain(aCx), file,
&NS_GET_IID(nsIDOMFile), &wrappedFile);
if (NS_FAILED(rv)) {
Error(aCx, nsIDOMDOMException::DATA_CLONE_ERR);
return nullptr;
}
return &wrappedFile.toObject();
}
if (aTag == SCTAG_DOM_BLOB) {
MOZ_ASSERT(aData < closure->mBlobs.Length());
nsCOMPtr<nsIDOMBlob> blob = do_QueryInterface(closure->mBlobs[aData]);
MOZ_ASSERT(blob);
#ifdef DEBUG
{
// Blob should not be mutable.
nsCOMPtr<nsIMutable> mutableBlob = do_QueryInterface(blob);
bool isMutable;
if (NS_FAILED(mutableBlob->GetMutable(&isMutable))) {
MOZ_NOT_REACHED("GetMutable failed!");
}
else {
MOZ_ASSERT(!isMutable);
}
}
#endif
jsval wrappedBlob;
nsresult rv =
nsContentUtils::WrapNative(aCx, JS_GetGlobalForScopeChain(aCx), blob,
&NS_GET_IID(nsIDOMBlob), &wrappedBlob);
if (NS_FAILED(rv)) {
Error(aCx, nsIDOMDOMException::DATA_CLONE_ERR);
return nullptr;
}
return &wrappedBlob.toObject();
}
return NS_DOMReadStructuredClone(aCx, aReader, aTag, aData, nullptr);
}
JSBool
Write(JSContext* aCx, JSStructuredCloneWriter* aWriter, JSObject* aObj,
void* aClosure)
{
MOZ_ASSERT(NS_IsMainThread());
MOZ_ASSERT(aClosure);
StructuredCloneClosure* closure =
static_cast<StructuredCloneClosure*>(aClosure);
// See if this is a wrapped native.
nsCOMPtr<nsIXPConnectWrappedNative> wrappedNative;
nsContentUtils::XPConnect()->
GetWrappedNativeOfJSObject(aCx, aObj, getter_AddRefs(wrappedNative));
if (wrappedNative) {
// Get the raw nsISupports out of it.
nsISupports* wrappedObject = wrappedNative->Native();
MOZ_ASSERT(wrappedObject);
// See if the wrapped native is a nsIDOMFile.
nsCOMPtr<nsIDOMFile> file = do_QueryInterface(wrappedObject);
if (file) {
nsCOMPtr<nsIMutable> mutableFile = do_QueryInterface(file);
if (mutableFile &&
NS_SUCCEEDED(mutableFile->SetMutable(false)) &&
JS_WriteUint32Pair(aWriter, SCTAG_DOM_FILE,
closure->mBlobs.Length())) {
closure->mBlobs.AppendElement(file);
return true;
}
}
// See if the wrapped native is a nsIDOMBlob.
nsCOMPtr<nsIDOMBlob> blob = do_QueryInterface(wrappedObject);
if (blob) {
nsCOMPtr<nsIMutable> mutableBlob = do_QueryInterface(blob);
if (mutableBlob &&
NS_SUCCEEDED(mutableBlob->SetMutable(false)) &&
JS_WriteUint32Pair(aWriter, SCTAG_DOM_BLOB,
closure->mBlobs.Length())) {
closure->mBlobs.AppendElement(blob);
return true;
}
}
}
return NS_DOMWriteStructuredClone(aCx, aWriter, aObj, nullptr);
}
JSStructuredCloneCallbacks gCallbacks = {
Read,
Write,
Error
};
} // anonymous namespace
namespace mozilla {
namespace dom {
bool
ReadStructuredClone(JSContext* aCx, uint64_t* aData, size_t aDataLength,
const StructuredCloneClosure& aClosure, JS::Value* aClone)
{
void* closure = &const_cast<StructuredCloneClosure&>(aClosure);
return !!JS_ReadStructuredClone(aCx, aData, aDataLength,
JS_STRUCTURED_CLONE_VERSION, aClone,
&gCallbacks, closure);
}
bool
WriteStructuredClone(JSContext* aCx, const JS::Value& aSource,
JSAutoStructuredCloneBuffer& aBuffer,
StructuredCloneClosure& aClosure)
{
return aBuffer.write(aCx, aSource, &gCallbacks, &aClosure);
}
} // namespace dom
} // namespace mozilla
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