new file mode 100644
--- /dev/null
+++ b/src/event/quic/ngx_event_quic_frames.h
@@ -0,0 +1,42 @@
+
+/*
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#ifndef _NGX_EVENT_QUIC_FRAMES_H_INCLUDED_
+#define _NGX_EVENT_QUIC_FRAMES_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+typedef ngx_int_t (*ngx_quic_frame_handler_pt)(ngx_connection_t *c,
+    ngx_quic_frame_t *frame, void *data);
+
+
+ngx_quic_frame_t *ngx_quic_alloc_frame(ngx_connection_t *c);
+void ngx_quic_free_frame(ngx_connection_t *c, ngx_quic_frame_t *frame);
+void ngx_quic_free_frames(ngx_connection_t *c, ngx_queue_t *frames);
+void ngx_quic_queue_frame(ngx_quic_connection_t *qc, ngx_quic_frame_t *frame);
+ngx_int_t ngx_quic_split_frame(ngx_connection_t *c, ngx_quic_frame_t *f,
+    size_t len);
+
+ngx_chain_t *ngx_quic_alloc_buf(ngx_connection_t *c);
+ngx_chain_t *ngx_quic_copy_buf(ngx_connection_t *c, u_char *data,
+    size_t len);
+ngx_chain_t *ngx_quic_copy_chain(ngx_connection_t *c, ngx_chain_t *in,
+    size_t limit);
+
+ngx_int_t ngx_quic_handle_ordered_frame(ngx_connection_t *c,
+    ngx_quic_frames_stream_t *fs, ngx_quic_frame_t *frame,
+    ngx_quic_frame_handler_pt handler, void *data);
+
+#if (NGX_DEBUG)
+void ngx_quic_log_frame(ngx_log_t *log, ngx_quic_frame_t *f, ngx_uint_t tx);
+#else
+#define ngx_quic_log_frame(log, f, tx)
+#endif
+
+#endif /* _NGX_EVENT_QUIC_FRAMES_H_INCLUDED_ */