Use statically known types, use hash for formats

[babeltrace.git] / formats / registry.c

diff --git a/formats/registry.c b/formats/registry.c
new file mode 100644 (file)
index 0000000..83e0aa0
--- /dev/null
+++ b/formats/registry.c
@@ -0,0 +1,69 @@
+/*
+ * BabelTrace
+ *
+ * Format Registry
+ *
+ * Copyright (c) 2010 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include <glib.h>
+#include <errno.h>
+
+static int init_done;
+void __attribute__((constructor)) format_init(void);
+void __attribute__((destructor)) format_finalize(void);
+
+/*
+ * Format registry hash table contains the registered formats. Format
+ * registration is typically performed by a format plugin.
+ * TODO: support plugin unload (unregistration of formats).
+ */
+GHashTable *format_registry;
+
+struct format *bt_lookup_format(GQuark qname)
+{
+       if (!init_done)
+               return NULL;
+       return g_hash_table_lookup(format_registry,
+                                  (gconstpointer) (unsigned long) qname)
+}
+
+int bt_register_format(const struct format *format)
+{
+       if (!init_done)
+               format_init();
+
+       if (bt_lookup_format(qname))
+               return -EEXIST;
+
+       g_hash_table_insert(format_registry,
+                           (gconstpointer) (unsigned long) format->name,
+                           format);
+       return 0;
+}
+
+void format_init(void)
+{
+       format_registry = g_hash_table_new(g_direct_hash, g_direct_equal);
+       assert(format_registry);
+       init_done = 1;
+}
+
+int format_finalize(void)
+{
+       g_hash_table_destroy(format_registry);
+}