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Minimal test - lines (22, 73)

Code

nsPrintSettingsServiceWin::SerializeToPrintData(nsIPrintSettings* aSettings,
                                                PrintData* data) {
  nsresult rv = nsPrintSettingsService::SerializeToPrintData(aSettings, data);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr psWin = do_QueryInterface(aSettings);
  if (!psWin) {
    return NS_ERROR_FAILURE;
  }

  nsAutoString deviceName;
  nsAutoString driverName;

  psWin->GetDeviceName(deviceName);
  psWin->GetDriverName(driverName);

  data->deviceName().Assign(deviceName);
  data->driverName().Assign(driverName);

  // When creating the print dialog on Windows, we only need to send certain
  // print settings information from the parent to the child not vice versa.
  if (XRE_IsParentProcess()) {
    // A DEVMODE can actually be of arbitrary size. If it turns out that it'll
    // make our IPC message larger than the limit, then we'll error out.
    LPDEVMODEW devModeRaw;
    psWin->GetDevMode(&devModeRaw);  // This actually allocates a copy of the
                                     // the nsIPrintSettingsWin DEVMODE, so
                                     // we're now responsible for deallocating
                                     // it. We'll use an nsAutoDevMode helper
                                     // to do this.
    if (devModeRaw) {
      nsAutoDevMode devMode(devModeRaw);
      devModeRaw = nullptr;

      size_t devModeTotalSize = devMode->dmSize + devMode->dmDriverExtra;
      size_t msgTotalSize = sizeof(PrintData) + devModeTotalSize;

      if (msgTotalSize > IPC::Channel::kMaximumMessageSize / 2) {
        return NS_ERROR_FAILURE;
      }

      // Instead of reaching in and manually reading each member, we'll just
      // copy the bits over.
      const char* devModeData = reinterpret_cast(devMode.get());
      nsTArray arrayBuf;
      arrayBuf.AppendElements(devModeData, devModeTotalSize);
      data->devModeData() = std::move(arrayBuf);
    }
  }

  return NS_OK;
}

Minimal test - lines (76, 115)

Code

nsPrintSettingsServiceWin::DeserializeToPrintSettings(
    const PrintData& data, nsIPrintSettings* settings) {
  nsresult rv =
      nsPrintSettingsService::DeserializeToPrintSettings(data, settings);
  NS_ENSURE_SUCCESS(rv, rv);

  nsCOMPtr psWin = do_QueryInterface(settings);
  if (!settings) {
    return NS_ERROR_FAILURE;
  }

  if (XRE_IsContentProcess()) {
    psWin->SetDeviceName(data.deviceName());
    psWin->SetDriverName(data.driverName());

    if (data.devModeData().IsEmpty()) {
      psWin->SetDevMode(nullptr);
    } else {
      // Check minimum length of DEVMODE data.
      auto devModeDataLength = data.devModeData().Length();
      if (devModeDataLength < sizeof(DEVMODEW)) {
        NS_WARNING("DEVMODE data is too short.");
        return NS_ERROR_FAILURE;
      }

      DEVMODEW* devMode = reinterpret_cast(
          const_cast(data.devModeData().Elements()));

      // Check actual length of DEVMODE data.
      if ((devMode->dmSize + devMode->dmDriverExtra) != devModeDataLength) {
        NS_WARNING("DEVMODE length is incorrect.");
        return NS_ERROR_FAILURE;
      }

      psWin->SetDevMode(devMode);  // Copies
    }
  }

  return NS_OK;
}

Minimal test - lines (117, 127)

Code

nsresult nsPrintSettingsServiceWin::_CreatePrintSettings(
    nsIPrintSettings** _retval) {
  *_retval = nullptr;
  nsPrintSettingsWin* printSettings =
      new nsPrintSettingsWin();  // does not initially ref count
  NS_ENSURE_TRUE(printSettings, NS_ERROR_OUT_OF_MEMORY);

  NS_ADDREF(*_retval = printSettings);  // ref count

  return NS_OK;
}