#include <nghttp2/nghttp2.h>

namespace {

int on_frame_recv_callback(nghttp2_session *session, const nghttp2_frame *frame,

                           void *user_data) {

  return 0;

}

} // namespace

namespace {

int on_begin_headers_callback(nghttp2_session *session,

                              const nghttp2_frame *frame, void *user_data) {

  return 0;

}

} // namespace

namespace {

int on_header_callback2(nghttp2_session *session, const nghttp2_frame *frame,

                        nghttp2_rcbuf *name, nghttp2_rcbuf *value,

                        uint8_t flags, void *user_data) {

  return 0;

}

} // namespace

namespace {

int before_frame_send_callback(nghttp2_session *session,

                               const nghttp2_frame *frame, void *user_data) {

  return 0;

}

} // namespace

namespace {

int on_frame_send_callback(nghttp2_session *session, const nghttp2_frame *frame,

                           void *user_data) {

  return 0;

}

} // namespace

namespace {

void send_pending(nghttp2_session *session) {

  for (;;) {

    const uint8_t *data;

    auto n = nghttp2_session_mem_send2(session, &data);

    if (n == 0) {

      return;

    }

  }

}

} // namespace

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {

  nghttp2_session *session;

  nghttp2_session_callbacks *callbacks;

  nghttp2_session_callbacks_new(&callbacks);

  nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks,

                                                       on_frame_recv_callback);

  nghttp2_session_callbacks_set_on_begin_headers_callback(

    callbacks, on_begin_headers_callback);

  nghttp2_session_callbacks_set_on_header_callback2(callbacks,

                                                    on_header_callback2);

  nghttp2_session_callbacks_set_before_frame_send_callback(

    callbacks, before_frame_send_callback);

  nghttp2_session_callbacks_set_on_frame_send_callback(callbacks,

                                                       on_frame_send_callback);

  nghttp2_session_server_new(&session, callbacks, nullptr);

  nghttp2_session_callbacks_del(callbacks);

  nghttp2_settings_entry iv{NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100};

  nghttp2_submit_settings(session, NGHTTP2_FLAG_NONE, &iv, 1);

  send_pending(session);

  nghttp2_session_mem_recv2(session, data, size);

  send_pending(session);

  nghttp2_session_del(session);

  return 0;

}