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diff --git a/src/quic.h b/src/quic.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2019 nghttp2 contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining
+ * a copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sublicense, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be
+ * included in all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+ * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+ * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
+ * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
+ * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+ * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+#ifndef QUIC_H
+#define QUIC_H
+
+#include "nghttp2_config.h"
+
+#include "stdint.h"
+
+namespace quic {
+
+enum class ErrorType {
+  Transport,
+  TransportVersionNegotiation,
+  TransportIdleTimeout,
+  Application,
+};
+
+struct Error {
+  Error(ErrorType type, uint64_t code) : type(type), code(code) {}
+  Error() : type(ErrorType::Transport), code(0) {}
+
+  ErrorType type;
+  uint64_t code;
+};
+
+Error err_transport(int liberr);
+Error err_transport_idle_timeout();
+Error err_transport_tls(int alert);
+Error err_application(int liberr);
+
+} // namespace quic
+
+#endif // QUIC_H