new file mode 100644
--- /dev/null
+++ b/src/http/v3/ngx_http_v3_tables.h
@@ -0,0 +1,52 @@
+
+/*
+ * Copyright (C) Roman Arutyunyan
+ * Copyright (C) Nginx, Inc.
+ */
+
+
+#ifndef _NGX_HTTP_V3_TABLES_H_INCLUDED_
+#define _NGX_HTTP_V3_TABLES_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_http.h>
+
+
+typedef struct {
+    ngx_str_t                     name;
+    ngx_str_t                     value;
+} ngx_http_v3_header_t;
+
+
+typedef struct {
+    ngx_http_v3_header_t        **elts;
+    ngx_uint_t                    nelts;
+    ngx_uint_t                    base;
+    size_t                        size;
+    size_t                        capacity;
+} ngx_http_v3_dynamic_table_t;
+
+
+ngx_int_t ngx_http_v3_ref_insert(ngx_connection_t *c, ngx_uint_t dynamic,
+    ngx_uint_t index, ngx_str_t *value);
+ngx_int_t ngx_http_v3_insert(ngx_connection_t *c, ngx_str_t *name,
+    ngx_str_t *value);
+ngx_int_t ngx_http_v3_set_capacity(ngx_connection_t *c, ngx_uint_t capacity);
+ngx_int_t ngx_http_v3_duplicate(ngx_connection_t *c, ngx_uint_t index);
+ngx_int_t ngx_http_v3_ack_header(ngx_connection_t *c, ngx_uint_t stream_id);
+ngx_int_t ngx_http_v3_inc_insert_count(ngx_connection_t *c, ngx_uint_t inc);
+ngx_int_t ngx_http_v3_lookup_static(ngx_connection_t *c, ngx_uint_t index,
+    ngx_str_t *name, ngx_str_t *value);
+ngx_int_t ngx_http_v3_lookup(ngx_connection_t *c, ngx_uint_t index,
+    ngx_str_t *name, ngx_str_t *value);
+ngx_int_t ngx_http_v3_decode_insert_count(ngx_connection_t *c,
+    ngx_uint_t *insert_count);
+ngx_int_t ngx_http_v3_check_insert_count(ngx_connection_t *c,
+    ngx_uint_t insert_count);
+ngx_int_t ngx_http_v3_set_param(ngx_connection_t *c, uint64_t id,
+    uint64_t value);
+
+
+#endif /* _NGX_HTTP_V3_TABLES_H_INCLUDED_ */