1 files changed, 63 insertions, 0 deletions
diff --git a/src/lib/dispatch/dispatch_naming.c b/src/lib/dispatch/dispatch_naming.c
new file mode 100644
index 0000000000..83d9a2d604
--- /dev/null
+++ b/src/lib/dispatch/dispatch_naming.c
@@ -0,0 +1,63 @@
+/* Copyright (c) 2001, Matej Pfajfar.
+ * Copyright (c) 2001-2004, Roger Dingledine.
+ * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
+ * Copyright (c) 2007-2018, The Tor Project, Inc. */
+/* See LICENSE for licensing information */
+
+#include "orconfig.h"
+
+#include "lib/cc/compat_compiler.h"
+
+#include "lib/dispatch/dispatch_naming.h"
+#include "lib/dispatch/msgtypes.h"
+
+#include "lib/container/namemap.h"
+#include "lib/container/namemap_st.h"
+
+#include "lib/log/util_bug.h"
+#include "lib/log/log.h"
+
+#include <stdlib.h>
+
+/** Global namemap for message IDs. */
+static namemap_t message_id_map = NAMEMAP_INIT();
+/** Global namemap for subsystem IDs. */
+static namemap_t subsys_id_map = NAMEMAP_INIT();
+/** Global namemap for channel IDs. */
+static namemap_t channel_id_map = NAMEMAP_INIT();
+/** Global namemap for message type IDs. */
+static namemap_t msg_type_id_map = NAMEMAP_INIT();
+
+void
+dispatch_naming_init(void)
+{
+}
+
+/* Helper macro: declare functions to map IDs to and from names for a given
+ * type in a namemap_t.
+ */
+#define DECLARE_ID_MAP_FNS(type)                                        \
+  type##_id_t                                                           \
+  get_##type##_id(const char *name)                                     \
+  {                                                                     \
+    unsigned u = namemap_get_or_create_id(&type##_id_map, name);        \
+    tor_assert(u != NAMEMAP_ERR);                                       \
+    tor_assert(u != ERROR_ID);                                          \
+    return (type##_id_t) u;                                             \
+  }                                                                     \
+  const char *                                                          \
+  get_##type##_id_name(type##_id_t id)                                  \
+  {                                                                     \
+    return namemap_fmt_name(&type##_id_map, id);                        \
+  }                                                                     \
+  size_t                                                                \
+  get_num_##type##_ids(void)                                            \
+  {                                                                     \
+    return namemap_get_size(&type##_id_map);                            \
+  }                                                                     \
+  EAT_SEMICOLON
+
+DECLARE_ID_MAP_FNS(message);
+DECLARE_ID_MAP_FNS(channel);
+DECLARE_ID_MAP_FNS(subsys);
+DECLARE_ID_MAP_FNS(msg_type);