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diff --git a/src/h2load_http3_session.h b/src/h2load_http3_session.h
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+++ b/src/h2load_http3_session.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 H2LOAD_HTTP3_SESSION_H
+#define H2LOAD_HTTP3_SESSION_H
+
+#include "h2load_session.h"
+
+#include <nghttp3/nghttp3.h>
+
+namespace h2load {
+
+struct Client;
+
+class Http3Session : public Session {
+public:
+  Http3Session(Client *client);
+  virtual ~Http3Session();
+  virtual void on_connect();
+  virtual int submit_request();
+  virtual int on_read(const uint8_t *data, size_t len);
+  virtual int on_write();
+  virtual void terminate();
+  virtual size_t max_concurrent_streams();
+
+  int init_conn();
+  int stream_close(int64_t stream_id, uint64_t app_error_code);
+  void recv_data(int64_t stream_id, const uint8_t *data, size_t datalen);
+  void consume(int64_t stream_id, size_t nconsumed);
+  void begin_headers(int64_t stream_id);
+  void recv_header(int64_t stream_id, const nghttp3_vec *name,
+                   const nghttp3_vec *value);
+  int stop_sending(int64_t stream_id, uint64_t app_error_code);
+  int reset_stream(int64_t stream_id, uint64_t app_error_code);
+
+  int close_stream(int64_t stream_id, uint64_t app_error_code);
+  int shutdown_stream_read(int64_t stream_id);
+  int extend_max_local_streams();
+  int64_t submit_request_internal();
+
+  ssize_t read_stream(uint32_t flags, int64_t stream_id, const uint8_t *data,
+                      size_t datalen);
+  ssize_t write_stream(int64_t &stream_id, int &fin, nghttp3_vec *vec,
+                       size_t veccnt);
+  void block_stream(int64_t stream_id);
+  void shutdown_stream_write(int64_t stream_id);
+  int add_write_offset(int64_t stream_id, size_t ndatalen);
+  int add_ack_offset(int64_t stream_id, size_t datalen);
+
+  void read_data(nghttp3_vec *vec, size_t veccnt, uint32_t *pflags);
+
+private:
+  Client *client_;
+  nghttp3_conn *conn_;
+  size_t npending_request_;
+  size_t reqidx_;
+};
+
+} // namespace h2load
+
+#endif // H2LOAD_HTTP3_SESSION_H