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diff --git a/src/app_helper.h b/src/app_helper.h
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+/*
+ * nghttp2 - HTTP/2 C Library
+ *
+ * Copyright (c) 2012 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 APP_HELPER_H
+#define APP_HELPER_H
+
+#include "nghttp2_config.h"
+
+#include <cinttypes>
+#include <cstdlib>
+#ifdef HAVE_SYS_TIME_H
+#  include <sys/time.h>
+#endif // HAVE_SYS_TIME_H
+#include <poll.h>
+
+#include <map>
+#include <chrono>
+
+#include <nghttp2/nghttp2.h>
+
+namespace nghttp2 {
+
+int verbose_on_header_callback(nghttp2_session *session,
+                               const nghttp2_frame *frame, const uint8_t *name,
+                               size_t namelen, const uint8_t *value,
+                               size_t valuelen, uint8_t flags, void *user_data);
+
+int verbose_on_frame_recv_callback(nghttp2_session *session,
+                                   const nghttp2_frame *frame, void *user_data);
+
+int verbose_on_invalid_frame_recv_callback(nghttp2_session *session,
+                                           const nghttp2_frame *frame,
+                                           int lib_error_code, void *user_data);
+
+int verbose_on_frame_send_callback(nghttp2_session *session,
+                                   const nghttp2_frame *frame, void *user_data);
+
+int verbose_on_data_chunk_recv_callback(nghttp2_session *session, uint8_t flags,
+                                        int32_t stream_id, const uint8_t *data,
+                                        size_t len, void *user_data);
+
+int verbose_error_callback(nghttp2_session *session, int lib_error_code,
+                           const char *msg, size_t len, void *user_data);
+
+// Returns difference between |a| and |b| in milliseconds, assuming
+// |a| is more recent than |b|.
+template <typename TimePoint>
+std::chrono::milliseconds time_delta(const TimePoint &a, const TimePoint &b) {
+  return std::chrono::duration_cast<std::chrono::milliseconds>(a - b);
+}
+
+// Resets timer
+void reset_timer();
+
+// Returns the duration since timer reset.
+std::chrono::milliseconds get_timer();
+
+// Returns current time point.
+std::chrono::steady_clock::time_point get_time();
+
+void print_timer();
+
+// Setting true will print characters with ANSI color escape codes
+// when printing HTTP2 frames. This function changes a static
+// variable.
+void set_color_output(bool f);
+
+// Set output file when printing HTTP2 frames. By default, stdout is
+// used.
+void set_output(FILE *file);
+
+ssize_t deflate_data(uint8_t *out, size_t outlen, const uint8_t *in,
+                     size_t inlen);
+
+} // namespace nghttp2
+
+#endif // APP_HELPER_H