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diff --git a/lib/nghttp2_callbacks.h b/lib/nghttp2_callbacks.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2014 Tatsuhiro Tsujikawa
+ *
+ * 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 NGHTTP2_CALLBACKS_H
+#define NGHTTP2_CALLBACKS_H
+
+#ifdef HAVE_CONFIG_H
+#  include <config.h>
+#endif /* HAVE_CONFIG_H */
+
+#include <nghttp2/nghttp2.h>
+
+/*
+ * Callback functions.
+ */
+struct nghttp2_session_callbacks {
+  /**
+   * Callback function invoked when the session wants to send data to
+   * the remote peer.  This callback is not necessary if the
+   * application uses solely `nghttp2_session_mem_send()` to serialize
+   * data to transmit.
+   */
+  nghttp2_send_callback send_callback;
+  /**
+   * Callback function invoked when the session wants to receive data
+   * from the remote peer.  This callback is not necessary if the
+   * application uses solely `nghttp2_session_mem_recv()` to process
+   * received data.
+   */
+  nghttp2_recv_callback recv_callback;
+  /**
+   * Callback function invoked by `nghttp2_session_recv()` when a
+   * frame is received.
+   */
+  nghttp2_on_frame_recv_callback on_frame_recv_callback;
+  /**
+   * Callback function invoked by `nghttp2_session_recv()` when an
+   * invalid non-DATA frame is received.
+   */
+  nghttp2_on_invalid_frame_recv_callback on_invalid_frame_recv_callback;
+  /**
+   * Callback function invoked when a chunk of data in DATA frame is
+   * received.
+   */
+  nghttp2_on_data_chunk_recv_callback on_data_chunk_recv_callback;
+  /**
+   * Callback function invoked before a non-DATA frame is sent.
+   */
+  nghttp2_before_frame_send_callback before_frame_send_callback;
+  /**
+   * Callback function invoked after a frame is sent.
+   */
+  nghttp2_on_frame_send_callback on_frame_send_callback;
+  /**
+   * The callback function invoked when a non-DATA frame is not sent
+   * because of an error.
+   */
+  nghttp2_on_frame_not_send_callback on_frame_not_send_callback;
+  /**
+   * Callback function invoked when the stream is closed.
+   */
+  nghttp2_on_stream_close_callback on_stream_close_callback;
+  /**
+   * Callback function invoked when the reception of header block in
+   * HEADERS or PUSH_PROMISE is started.
+   */
+  nghttp2_on_begin_headers_callback on_begin_headers_callback;
+  /**
+   * Callback function invoked when a header name/value pair is
+   * received.
+   */
+  nghttp2_on_header_callback on_header_callback;
+  nghttp2_on_header_callback2 on_header_callback2;
+  /**
+   * Callback function invoked when a invalid header name/value pair
+   * is received which is silently ignored if these callbacks are not
+   * set.
+   */
+  nghttp2_on_invalid_header_callback on_invalid_header_callback;
+  nghttp2_on_invalid_header_callback2 on_invalid_header_callback2;
+  /**
+   * Callback function invoked when the library asks application how
+   * many padding bytes are required for the transmission of the given
+   * frame.
+   */
+  nghttp2_select_padding_callback select_padding_callback;
+  /**
+   * The callback function used to determine the length allowed in
+   * `nghttp2_data_source_read_callback()`
+   */
+  nghttp2_data_source_read_length_callback read_length_callback;
+  /**
+   * Sets callback function invoked when a frame header is received.
+   */
+  nghttp2_on_begin_frame_callback on_begin_frame_callback;
+  nghttp2_send_data_callback send_data_callback;
+  nghttp2_pack_extension_callback pack_extension_callback;
+  nghttp2_unpack_extension_callback unpack_extension_callback;
+  nghttp2_on_extension_chunk_recv_callback on_extension_chunk_recv_callback;
+  nghttp2_error_callback error_callback;
+  nghttp2_error_callback2 error_callback2;
+};
+
+#endif /* NGHTTP2_CALLBACKS_H */