Move most of the plugin code from epan to wsutil and remove all

knowledge of particular types of plugins.  Instead, let particular types
of plugins register with the common plugin code, giving a name and a
routine to recognize that type of plugin.

In particular applications, only process the relevant plugin types.

Add a Makefile.common to the codecs directory.

svn path=/trunk/; revision=53710

1 files changed, 71 insertions, 2 deletions

diff --git a/epan/tap.c b/epan/tap.c
index 7ac5e54bc6..f4036afdb6 100644
--- a/epan/tap.c
+++ b/epan/tap.c
@@ -77,6 +77,77 @@ typedef struct _tap_listener_t {
 } tap_listener_t;
 static volatile tap_listener_t *tap_listener_queue=NULL;
 
+#ifdef HAVE_PLUGINS
+
+#include <gmodule.h>
+
+#include <wsutil/plugins.h>
+
+/*
+ * List of tap plugins.
+ */
+typedef struct {
+	void (*register_tap_listener_fn)(void);   /* routine to call to register tap listener */
+} tap_plugin;
+
+static GSList *tap_plugins = NULL;
+
+/*
+ * Callback for each plugin found.
+ */
+static gboolean
+check_for_tap_plugin(GModule *handle)
+{
+	gpointer gp;
+	void (*register_tap_listener_fn)(void);
+	tap_plugin *plugin;
+
+	/*
+	 * Do we have a register_tap_listener routine?
+	 */
+	if (!g_module_symbol(handle, "plugin_register_tap_listener", &gp)) {
+		/* No, so this isn't a tap plugin. */
+		return FALSE;
+	}
+
+	/*
+	 * Yes - this plugin includes one or more taps.
+	 */
+	register_tap_listener_fn = (void (*)(void))gp;
+
+	/*
+	 * Add this one to the list of tap plugins.
+	 */
+	plugin = (tap_plugin *)g_malloc(sizeof (tap_plugin));
+	plugin->register_tap_listener_fn = register_tap_listener_fn;
+	tap_plugins = g_slist_append(tap_plugins, plugin);
+	return TRUE;
+}
+
+void
+register_tap_plugin_type(void)
+{
+	add_plugin_type("tap", check_for_tap_plugin);
+}
+
+static void
+register_tap_plugin_listener(gpointer data, gpointer user_data _U_)
+{
+	tap_plugin *plugin = (tap_plugin *)data;
+
+	(plugin->register_tap_listener_fn)();
+}
+
+/*
+ * For all tap plugins, call their register routines.
+ */
+void
+register_all_plugin_tap_listeners(void)
+{
+	g_slist_foreach(tap_plugins, register_tap_plugin_listener, NULL);
+}
+#endif /* HAVE_PLUGINS */
+
 /* **********************************************************************
  * Init routine only called from epan at application startup
  * ********************************************************************** */
@@ -87,8 +158,6 @@ void
 tap_init(void)
 {
 	tap_packet_index=0;
-
-	return;
 }
 
 /* **********************************************************************