Function CheckDetachUpdatesData

test/array_buffer.cc:162–221

}

void CheckDetachUpdatesData(const CallbackInfo& info) {
  if (!info[0].IsArrayBuffer()) {
    Error::New(info.Env(), "A buffer was expected.")
        .ThrowAsJavaScriptException();
    return;
  }

  ArrayBuffer buffer = info[0].As<ArrayBuffer>();

  // This potentially causes the buffer to cache its data pointer and length.
  buffer.Data();
  buffer.ByteLength();

#if NAPI_VERSION >= 7
  if (buffer.IsDetached()) {
    Error::New(info.Env(), "Buffer should not be detached.")
        .ThrowAsJavaScriptException();
    return;
  }
#endif

  if (info.Length() == 2) {
    // Detach externally (in JavaScript).
    if (!info[1].IsFunction()) {
      Error::New(info.Env(), "A function was expected.")
          .ThrowAsJavaScriptException();
      return;
    }

    Function detach = info[1].As<Function>();
    detach.Call({});
  } else {
#if NAPI_VERSION >= 7
    // Detach directly.
    buffer.Detach();
#else
    return;
#endif
  }

#if NAPI_VERSION >= 7
  if (!buffer.IsDetached()) {
    Error::New(info.Env(), "Buffer should be detached.")
        .ThrowAsJavaScriptException();
    return;
  }
#endif

  if (buffer.Data() != nullptr) {
    Error::New(info.Env(), "Incorrect data pointer.")
        .ThrowAsJavaScriptException();
    return;
  }

  if (buffer.ByteLength() != 0) {
    Error::New(info.Env(), "Incorrect buffer length.")
        .ThrowAsJavaScriptException();
    return;