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diff --git a/runtime/lookup.h b/runtime/lookup.h
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+++ b/runtime/lookup.h
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+/* header for lookup.c
+ *
+ * Copyright 2013-2023 Adiscon GmbH.
+ *
+ * This file is part of the rsyslog runtime library.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *       http://www.apache.org/licenses/LICENSE-2.0
+ *       -or-
+ *       see COPYING.ASL20 in the source distribution
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+#ifndef INCLUDED_LOOKUP_H
+#define INCLUDED_LOOKUP_H
+#include <libestr.h>
+
+#define STRING_LOOKUP_TABLE 1
+#define ARRAY_LOOKUP_TABLE 2
+#define SPARSE_ARRAY_LOOKUP_TABLE 3
+#define STUBBED_LOOKUP_TABLE 4
+
+#define LOOKUP_KEY_TYPE_STRING 1
+#define LOOKUP_KEY_TYPE_UINT 2
+#define LOOKUP_KEY_TYPE_NONE 3
+
+struct lookup_tables_s {
+	lookup_ref_t *root;	/* the root of the template list */
+	lookup_ref_t *last;	/* points to the last element of the template list */
+};
+
+struct lookup_array_tab_s {
+	uint32_t first_key;
+	uchar **interned_val_refs;
+};
+
+struct lookup_sparseArray_tab_entry_s {
+	uint32_t key;
+	uchar *interned_val_ref;
+};
+
+struct lookup_sparseArray_tab_s {
+	lookup_sparseArray_tab_entry_t *entries;
+};
+
+struct lookup_string_tab_entry_s {
+	uchar *key;
+	uchar *interned_val_ref;
+};
+
+struct lookup_string_tab_s {
+	lookup_string_tab_entry_t *entries;
+};
+
+struct lookup_ref_s {
+	pthread_rwlock_t rwlock;	/* protect us in case of dynamic reloads */
+	uchar *name;
+	uchar *filename;
+	lookup_t *self;
+	lookup_ref_t *next;
+	/* reload specific attributes */
+	pthread_mutex_t reloader_mut; /* signaling + access to reload-flow variables*/
+	/* rwlock(above) may be acquired inside critical-section reloader_mut guards */
+	pthread_cond_t run_reloader;
+	pthread_t reloader;
+	pthread_attr_t reloader_thd_attr;
+	uchar *stub_value_for_reload_failure;
+	uint8_t do_reload;
+	uint8_t do_stop;
+	uint8_t reload_on_hup;
+};
+
+typedef es_str_t* (lookup_fn_t)(lookup_t*, lookup_key_t);
+
+/* a single lookup table */
+struct lookup_s {
+	uint32_t nmemb;
+	uint8_t type;
+	uint8_t key_type;
+	union {
+		lookup_string_tab_t *str;
+		lookup_array_tab_t *arr;
+		lookup_sparseArray_tab_t *sprsArr;
+	} table;
+	uint32_t interned_val_count;
+	uchar **interned_vals;
+	uchar *nomatch;
+	lookup_fn_t *lookup;
+};
+
+union lookup_key_u {
+	uchar* k_str;
+	uint32_t k_uint;
+};
+
+/* prototypes */
+void lookupInitCnf(lookup_tables_t *lu_tabs);
+rsRetVal lookupTableDefProcessCnf(struct cnfobj *o);
+lookup_ref_t *lookupFindTable(uchar *name);
+es_str_t * lookupKey(lookup_ref_t *pThis, lookup_key_t key);
+void lookupDestroyCnf(void);
+void lookupClassExit(void);
+void lookupDoHUP(void);
+rsRetVal lookupReload(lookup_ref_t *pThis, const uchar *stub_value_if_reload_fails);
+uint lookupPendingReloadCount(void);
+rsRetVal lookupClassInit(void);
+void lookupActivateConf(void);
+
+#endif /* #ifndef INCLUDED_LOOKUP_H */