1 files changed, 59 insertions, 0 deletions
diff --git a/src/x/event.cc b/src/x/event.cc
new file mode 100644
index 0000000..8346b40
--- /dev/null
+++ b/src/x/event.cc
@@ -0,0 +1,59 @@
+// Copyright 2021, 2022 Benjamin Barenblat
+//
+// Licensed under the Apache License, Version 2.0 (the "License"); you may not
+// use this file except in compliance with the License. You may obtain a copy of
+// the License at
+//
+//     https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+// WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+// License for the specific language governing permissions and limitations under
+// the License.
+
+#include "src/x/event.h"
+
+#include <stdint.h>
+#include <string.h>
+#include <xcb/xcb.h>
+
+#include <algorithm>
+#include <array>
+#include <stdexcept>
+
+#include "third_party/abseil/absl/types/variant.h"
+
+namespace x {
+
+namespace {
+
+constexpr uint8_t kXcbResponseTypeMask = 0x7f;
+
+}  // namespace
+
+Event FromXcbGenericEvent(const xcb_generic_event_t& event) noexcept {
+  switch (event.response_type & kXcbResponseTypeMask) {
+    case XCB_EXPOSE:
+      return ExposeEvent(event);
+    case XCB_CONFIGURE_NOTIFY:
+      return ConfigureNotifyEvent(event);
+    case XCB_CLIENT_MESSAGE:
+      return ClientMessageEvent(event);
+    default:
+      return UnknownEvent(event);
+  }
+}
+
+std::array<char, 32> SerializeEvent(const Event& event) noexcept {
+  std::array<char, 32> raw = {};
+  absl::visit(
+      [&](auto&& ev) {
+        const auto& xcb_ev = ev.AsXcbEvent();
+        memcpy(raw.data(), &xcb_ev, std::min(raw.size(), sizeof(xcb_ev)));
+      },
+      event);
+  return raw;
+}
+
+}  // namespace x