C++ Handle::toObject方法代码示例

NS_IMETHODIMP
ArrayBufferInputStream::SetData(JS::Handle<JS::Value> aBuffer,
                                uint32_t aByteOffset,
                                uint32_t aLength,
                                JSContext* aCx)
{
  if (!aBuffer.isObject()) {
    return NS_ERROR_FAILURE;
  }
  JS::RootedObject arrayBuffer(aCx, &aBuffer.toObject());
  if (!JS_IsArrayBufferObject(arrayBuffer)) {
    return NS_ERROR_FAILURE;
  }

  mArrayBuffer.construct(aCx, aBuffer);

  uint32_t buflen = JS_GetArrayBufferByteLength(arrayBuffer);
  mOffset = std::min(buflen, aByteOffset);
  mBufferLength = std::min(buflen - mOffset, aLength);
  mBuffer = JS_GetStableArrayBufferData(aCx, arrayBuffer);
  if (!mBuffer) {
      return NS_ERROR_FAILURE;
  }
  return NS_OK;
}

bool
FieldSetterImpl(JSContext *cx, JS::CallArgs args)
{
  JS::Handle<JS::Value> thisv = args.thisv();
  MOZ_ASSERT(ValueHasISupportsPrivate(thisv));

  JS::Rooted<JSObject*> thisObj(cx, &thisv.toObject());

  // We should be in the compartment of |this|. If we got here via nativeCall,
  // |this| is not same-compartment with |callee|, and it's possible via
  // asymmetric security semantics that |args.calleev()| is actually a security
  // wrapper. In this case, we know we want to do an unsafe unwrap, and
  // InstallXBLField knows how to handle cross-compartment pointers.
  bool installed = false;
  JS::Rooted<JSObject*> callee(cx, js::UncheckedUnwrap(&args.calleev().toObject()));
  JS::Rooted<jsid> id(cx);
  if (!InstallXBLField(cx, callee, thisObj, &id, &installed)) {
    return false;
  }

  if (installed) {
    if (!::JS_SetPropertyById(cx, thisObj, id, args.get(0))) {
      return false;
    }
  }
  args.rval().setUndefined();
  return true;
}

// static
nsresult
IDBKeyRange::FromJSVal(JSContext* aCx,
                       JS::Handle<JS::Value> aVal,
                       IDBKeyRange** aKeyRange)
{
  nsRefPtr<IDBKeyRange> keyRange;

  if (aVal.isNullOrUndefined()) {
    // undefined and null returns no IDBKeyRange.
    keyRange.forget(aKeyRange);
    return NS_OK;
  }

  JS::Rooted<JSObject*> obj(aCx, aVal.isObject() ? &aVal.toObject() : nullptr);
  if (aVal.isPrimitive() || JS_IsArrayObject(aCx, obj) ||
      JS_ObjectIsDate(aCx, obj)) {
    // A valid key returns an 'only' IDBKeyRange.
    keyRange = new IDBKeyRange(nullptr, false, false, true);

    nsresult rv = GetKeyFromJSVal(aCx, aVal, keyRange->Lower());
    if (NS_FAILED(rv)) {
      return rv;
    }
  }
  else {
    MOZ_ASSERT(aVal.isObject());
    // An object is not permitted unless it's another IDBKeyRange.
    if (NS_FAILED(UNWRAP_OBJECT(IDBKeyRange, obj, keyRange))) {
      return NS_ERROR_DOM_INDEXEDDB_DATA_ERR;
    }
  }

  keyRange.forget(aKeyRange);
  return NS_OK;
}

NS_IMETHODIMP
TCPSocketParent::InitJS(JS::Handle<JS::Value> aIntermediary, JSContext* aCx)
{
  MOZ_ASSERT(aIntermediary.isObject());
  mIntermediaryObj = &aIntermediary.toObject();
  return NS_OK;
}

// PromiseNativeHandler
void
PresentationResponderInfo::ResolvedCallback(JSContext* aCx,
                                            JS::Handle<JS::Value> aValue)
{
  MOZ_ASSERT(NS_IsMainThread());

  if (NS_WARN_IF(!aValue.isObject())) {
    ReplyError(NS_ERROR_NOT_AVAILABLE);
    return;
  }

  JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
  if (NS_WARN_IF(!obj)) {
    ReplyError(NS_ERROR_NOT_AVAILABLE);
    return;
  }

  // Start to listen to document state change event |STATE_TRANSFERRING|.
  HTMLIFrameElement* frame = nullptr;
  nsresult rv = UNWRAP_OBJECT(HTMLIFrameElement, obj, frame);
  if (NS_WARN_IF(!frame)) {
    ReplyError(NS_ERROR_NOT_AVAILABLE);
    return;
  }

  nsCOMPtr<nsIFrameLoaderOwner> owner = do_QueryInterface((nsIFrameLoaderOwner*) frame);
  if (NS_WARN_IF(!owner)) {
    ReplyError(NS_ERROR_NOT_AVAILABLE);
    return;
  }

  nsCOMPtr<nsIFrameLoader> frameLoader;
  rv = owner->GetFrameLoader(getter_AddRefs(frameLoader));
  if (NS_WARN_IF(NS_FAILED(rv))) {
    ReplyError(rv);
    return;
  }

  nsRefPtr<TabParent> tabParent = TabParent::GetFrom(frameLoader);
  if (tabParent) {
    // OOP frame
    nsCOMPtr<nsIContentParent> cp = tabParent->Manager();
    NS_WARN_IF(!static_cast<ContentParent*>(cp.get())->SendNotifyPresentationReceiverLaunched(tabParent, mSessionId));
  } else {
    // In-process frame
    nsCOMPtr<nsIDocShell> docShell;
    rv = frameLoader->GetDocShell(getter_AddRefs(docShell));
    if (NS_WARN_IF(NS_FAILED(rv))) {
      ReplyError(rv);
      return;
    }

    mLoadingCallback = new PresentationResponderLoadingCallback(mSessionId);
    rv = mLoadingCallback->Init(docShell);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      ReplyError(rv);
      return;
    }
  }
}

NS_IMETHODIMP
MobileConnectionRequestParent::NotifyGetCallForwardingSuccess(JS::Handle<JS::Value> aResults)
{
  uint32_t length;
  AutoSafeJSContext cx;
  JS::Rooted<JSObject*> object(cx, &aResults.toObject());
  nsTArray<IPC::MozCallForwardingOptions> results;

  if (!JS_IsArrayObject(cx, object) ||
      !JS_GetArrayLength(cx, object, &length)) {
    return NS_ERROR_TYPE_ERR;
  }

  for (uint32_t i = 0; i < length; i++) {
    JS::Rooted<JS::Value> entry(cx);
    IPC::MozCallForwardingOptions info;

    if (!JS_GetElement(cx, object, i, &entry) || !info.Init(cx, entry)) {
      return NS_ERROR_TYPE_ERR;
    }

    results.AppendElement(info);
  }

  return SendReply(MobileConnectionReplySuccessCallForwarding(results));
}

NS_IMETHODIMP
nsBinaryInputStream::ReadArrayBuffer(uint32_t aLength,
                                     JS::Handle<JS::Value> aBuffer,
                                     JSContext* aCx, uint32_t* aReadLength)
{
  if (!aBuffer.isObject()) {
    return NS_ERROR_FAILURE;
  }
  JS::RootedObject buffer(aCx, &aBuffer.toObject());
  if (!JS_IsArrayBufferObject(buffer)) {
    return NS_ERROR_FAILURE;
  }

  uint32_t bufferLength = JS_GetArrayBufferByteLength(buffer);
  if (bufferLength < aLength) {
    return NS_ERROR_FAILURE;
  }

  uint32_t bufSize = std::min<uint32_t>(aLength, 4096);
  UniquePtr<char[]> buf = MakeUnique<char[]>(bufSize);

  uint32_t pos = 0;
  *aReadLength = 0;
  do {
    // Read data into temporary buffer.
    uint32_t bytesRead;
    uint32_t amount = std::min(aLength - pos, bufSize);
    nsresult rv = Read(buf.get(), amount, &bytesRead);
    if (NS_WARN_IF(NS_FAILED(rv))) {
      return rv;
    }
    MOZ_ASSERT(bytesRead <= amount);

    if (bytesRead == 0) {
      break;
    }

    // Copy data into actual buffer.

    JS::AutoCheckCannotGC nogc;
    bool isShared;
    if (bufferLength != JS_GetArrayBufferByteLength(buffer)) {
      return NS_ERROR_FAILURE;
    }

    char* data = reinterpret_cast<char*>(JS_GetArrayBufferData(buffer, &isShared, nogc));
    MOZ_ASSERT(!isShared);      // Implied by JS_GetArrayBufferData()
    if (!data) {
      return NS_ERROR_FAILURE;
    }

    *aReadLength += bytesRead;
    PodCopy(data + pos, buf.get(), bytesRead);

    pos += bytesRead;
  } while (pos < aLength);

  return NS_OK;
}

bool
ValueHasISupportsPrivate(JS::Handle<JS::Value> v)
{
  if (!v.isObject()) {
    return false;
  }

  const DOMJSClass* domClass = GetDOMClass(&v.toObject());
  if (domClass) {
    return domClass->mDOMObjectIsISupports;
  }

  const JSClass* clasp = ::JS_GetClass(&v.toObject());
  const uint32_t HAS_PRIVATE_NSISUPPORTS =
    JSCLASS_HAS_PRIVATE | JSCLASS_PRIVATE_IS_NSISUPPORTS;
  return (clasp->flags & HAS_PRIVATE_NSISUPPORTS) == HAS_PRIVATE_NSISUPPORTS;
}

NS_IMETHODIMP
nsSpeechTask::SendAudio(JS::Handle<JS::Value> aData, JS::Handle<JS::Value> aLandmarks,
                        JSContext* aCx)
{
  MOZ_ASSERT(XRE_IsParentProcess());

  if(NS_WARN_IF(!(mStream))) {
    return NS_ERROR_NOT_AVAILABLE;
  }
  if(NS_WARN_IF(mStream->IsDestroyed())) {
    return NS_ERROR_NOT_AVAILABLE;
  }
  if(NS_WARN_IF(!(mChannels))) {
    return NS_ERROR_FAILURE;
  }
  if(NS_WARN_IF(!(aData.isObject()))) {
    return NS_ERROR_INVALID_ARG;
  }

  if (mIndirectAudio) {
    NS_WARNING("Can't call SendAudio from an indirect audio speech service.");
    return NS_ERROR_FAILURE;
  }

  JS::Rooted<JSObject*> darray(aCx, &aData.toObject());
  JSAutoCompartment ac(aCx, darray);

  JS::Rooted<JSObject*> tsrc(aCx, nullptr);

  // Allow either Int16Array or plain JS Array
  if (JS_IsInt16Array(darray)) {
    tsrc = darray;
  } else {
    bool isArray;
    if (!JS_IsArrayObject(aCx, darray, &isArray)) {
      return NS_ERROR_UNEXPECTED;
    }
    if (isArray) {
      tsrc = JS_NewInt16ArrayFromArray(aCx, darray);
    }
  }

  if (!tsrc) {
    return NS_ERROR_DOM_TYPE_MISMATCH_ERR;
  }

  uint32_t dataLen = JS_GetTypedArrayLength(tsrc);
  RefPtr<mozilla::SharedBuffer> samples;
  {
    JS::AutoCheckCannotGC nogc;
    samples = makeSamples(JS_GetInt16ArrayData(tsrc, nogc), dataLen);
  }
  SendAudioImpl(samples, dataLen);

  return NS_OK;
}

static already_AddRefed<EventListener>
ToEventListener(JSContext* aCx, JS::Handle<JS::Value> aValue)
{
  if (NS_WARN_IF(!aValue.isObject())) {
    return nullptr;
  }

  JS::Rooted<JSObject*> obj(aCx, &aValue.toObject());
  RefPtr<EventListener> listener =
    new EventListener(aCx, obj, GetIncumbentGlobal());
  return listener.forget();
}

nsresult
TelephonyDialCallback::NotifyDialMMISuccess(JSContext* aCx,
                                            const nsAString& aStatusMessage,
                                            JS::Handle<JS::Value> aInfo)
{
  RootedDictionary<MozMMIResult> result(aCx);

  result.mServiceCode.Assign(mServiceCode);
  result.mStatusMessage.Assign(aStatusMessage);
  result.mAdditionalInformation.Construct().SetAsObject() = &aInfo.toObject();

  return NotifyDialMMISuccess(aCx, result);
}

NS_IMETHODIMP
WebVTTListener::OnRegion(JS::Handle<JS::Value> aRegion, JSContext* aCx)
{
  if (!aRegion.isObject()) {
    return NS_ERROR_FAILURE;
  }

  TextTrackRegion* region;
  nsresult rv = UNWRAP_OBJECT(VTTRegion, &aRegion.toObject(), region);
  NS_ENSURE_SUCCESS(rv, rv);

  mElement->mTrack->AddRegion(*region);

  return NS_OK;
}

NS_IMETHODIMP
WebVTTListener::OnCue(JS::Handle<JS::Value> aCue, JSContext* aCx)
{
  if (!aCue.isObject()) {
    return NS_ERROR_FAILURE;
  }

  TextTrackCue* cue = nullptr;
  nsresult rv = UNWRAP_OBJECT(VTTCue, &aCue.toObject(), cue);
  NS_ENSURE_SUCCESS(rv, rv);

  cue->SetTrackElement(mElement);
  mElement->mTrack->AddCue(*cue);

  return NS_OK;
}

// static
nsresult
IDBKeyRange::FromJSVal(JSContext* aCx,
                       JS::Handle<JS::Value> aVal,
                       IDBKeyRange** aKeyRange)
{
  MOZ_ASSERT_IF(!aCx, aVal.isUndefined());

  RefPtr<IDBKeyRange> keyRange;

  if (aVal.isNullOrUndefined()) {
    // undefined and null returns no IDBKeyRange.
    keyRange.forget(aKeyRange);
    return NS_OK;
  }

  JS::Rooted<JSObject*> obj(aCx, aVal.isObject() ? &aVal.toObject() : nullptr);
  bool isValidKey = aVal.isPrimitive();
  if (!isValidKey) {
    js::ESClass cls;
    if (!js::GetBuiltinClass(aCx, obj, &cls)) {
      return NS_ERROR_UNEXPECTED;
    }
    isValidKey = cls == js::ESClass::Array || cls == js::ESClass::Date;
  }
  if (isValidKey) {
    // A valid key returns an 'only' IDBKeyRange.
    keyRange = new IDBKeyRange(nullptr, false, false, true);

    nsresult rv = GetKeyFromJSVal(aCx, aVal, keyRange->Lower());
    if (NS_FAILED(rv)) {
      return rv;
    }
  }
  else {
    MOZ_ASSERT(aVal.isObject());
    // An object is not permitted unless it's another IDBKeyRange.
    if (NS_FAILED(UNWRAP_OBJECT(IDBKeyRange, obj, keyRange))) {
      return NS_ERROR_DOM_INDEXEDDB_DATA_ERR;
    }
  }

  keyRange.forget(aKeyRange);
  return NS_OK;
}

NS_IMETHODIMP
SmsFilter::SetNumbers(JSContext* aCx, JS::Handle<JS::Value> aNumbers)
{
  if (aNumbers.isNull()) {
    mData.numbers().Clear();
    return NS_OK;
  }

  if (!aNumbers.isObject()) {
    return NS_ERROR_INVALID_ARG;
  }

  JS::Rooted<JSObject*> obj(aCx, &aNumbers.toObject());
  if (!JS_IsArrayObject(aCx, obj)) {
    return NS_ERROR_INVALID_ARG;
  }

  uint32_t size;
  JS_ALWAYS_TRUE(JS_GetArrayLength(aCx, obj, &size));

  nsTArray<nsString> numbers;

  for (uint32_t i=0; i<size; ++i) {
    JS::Rooted<JS::Value> jsNumber(aCx);
    if (!JS_GetElement(aCx, obj, i, &jsNumber)) {
      return NS_ERROR_INVALID_ARG;
    }

    if (!jsNumber.isString()) {
      return NS_ERROR_INVALID_ARG;
    }

    nsDependentJSString number;
    number.init(aCx, jsNumber.toString());

    numbers.AppendElement(number);
  }

  mData.numbers().Clear();
  mData.numbers().AppendElements(numbers);

  return NS_OK;
}