C++ (Cpp) Blob::ToFile Examples

Example #1

already_AddRefed<File>
DataTransferItem::GetAsFile(nsIPrincipal& aSubjectPrincipal,
                            ErrorResult& aRv)
{
  // This is done even if we have an mCachedFile, as it performs the necessary
  // permissions checks to ensure that we are allowed to access this type.
  nsCOMPtr<nsIVariant> data = Data(&aSubjectPrincipal, aRv);
  if (NS_WARN_IF(!data || aRv.Failed())) {
    return nullptr;
  }

  // We have to check our kind after getting the data, because if we have
  // external data and the OS lied to us (which unfortunately does happen
  // sometimes), then we might not have the same type of data as we did coming
  // into this function.
  if (NS_WARN_IF(mKind != KIND_FILE)) {
    return nullptr;
  }

  // Generate the dom::File from the stored data, caching it so that the
  // same object is returned in the future.
  if (!mCachedFile) {
    nsCOMPtr<nsISupports> supports;
    aRv = data->GetAsISupports(getter_AddRefs(supports));
    MOZ_ASSERT(!aRv.Failed() && supports,
               "File objects should be stored as nsISupports variants");
    if (aRv.Failed() || !supports) {
      return nullptr;
    }

    if (nsCOMPtr<nsIDOMBlob> domBlob = do_QueryInterface(supports)) {
      Blob* blob = static_cast<Blob*>(domBlob.get());
      mCachedFile = blob->ToFile();
    } else if (nsCOMPtr<BlobImpl> blobImpl = do_QueryInterface(supports)) {
      MOZ_ASSERT(blobImpl->IsFile());
      mCachedFile = File::Create(mDataTransfer, blobImpl);
    } else if (nsCOMPtr<nsIFile> ifile = do_QueryInterface(supports)) {
      mCachedFile = File::CreateFromFile(mDataTransfer, ifile);
    } else {
      MOZ_ASSERT(false, "One of the above code paths should be taken");
      return nullptr;
    }
  }

  RefPtr<File> file = mCachedFile;
  return file.forget();
}

Example #2

File: DataTransferItem.cpp Project: cstipkovic/gecko-dev

already_AddRefed<File>
DataTransferItem::GetAsFileWithPrincipal(nsIPrincipal* aPrincipal, ErrorResult& aRv)
{
  if (mKind != KIND_FILE) {
    return nullptr;
  }

  // This is done even if we have an mCachedFile, as it performs the necessary
  // permissions checks to ensure that we are allowed to access this type.
  nsCOMPtr<nsIVariant> data = Data(aPrincipal, aRv);
  if (NS_WARN_IF(!data || aRv.Failed())) {
    return nullptr;
  }

  // Generate the dom::File from the stored data, caching it so that the
  // same object is returned in the future.
  if (!mCachedFile) {
    nsCOMPtr<nsISupports> supports;
    aRv = data->GetAsISupports(getter_AddRefs(supports));
    MOZ_ASSERT(!aRv.Failed() && supports,
               "File objects should be stored as nsISupports variants");
    if (aRv.Failed() || !supports) {
      return nullptr;
    }

    if (nsCOMPtr<nsIDOMBlob> domBlob = do_QueryInterface(supports)) {
      Blob* blob = static_cast<Blob*>(domBlob.get());
      mCachedFile = blob->ToFile();
    } else if (nsCOMPtr<BlobImpl> blobImpl = do_QueryInterface(supports)) {
      MOZ_ASSERT(blobImpl->IsFile());
      mCachedFile = File::Create(mDataTransfer, blobImpl);
    } else if (nsCOMPtr<nsIFile> ifile = do_QueryInterface(supports)) {
      mCachedFile = File::CreateFromFile(mDataTransfer, ifile);
    } else {
      MOZ_ASSERT(false, "One of the above code paths should be taken");
    }
  }

  RefPtr<File> file = mCachedFile;
  return file.forget();
}