probe: infrastructure for run-time features probing

[vlc] / include / vlc_probe.h

diff --git a/include/vlc_probe.h b/include/vlc_probe.h
new file mode 100644 (file)
index 0000000..227889b
--- /dev/null
+++ b/include/vlc_probe.h
@@ -0,0 +1,70 @@
+/*****************************************************************************
+ * vlc_probe.h: service probing interface
+ *****************************************************************************
+ * Copyright (C) 2009 Rémi Denis-Courmont
+ *
+ * This program 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 program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
+ *****************************************************************************/
+
+#ifndef VLC_PROBE_H
+# define VLC_PROBE_H 1
+
+# include <stdlib.h>
+
+/**
+ * \file
+ * This file defines functions and structures to run-time probe VLC extensions
+ */
+
+# ifdef __cplusplus
+extern "C" {
+# endif
+
+VLC_EXPORT(void *, vlc_probe, (vlc_object_t *, const char *,
+                               size_t *restrict));
+#define vlc_probe(obj, cap, pcount) \
+        vlc_probe(VLC_OBJECT(obj), cap, pcount)
+
+struct vlc_probe_t
+{
+    VLC_COMMON_MEMBERS
+
+    void  *list;
+    size_t count;
+};
+
+typedef struct vlc_probe_t vlc_probe_t;
+
+static inline int vlc_probe_add(vlc_probe_t *obj, const void *data,
+                                size_t len)
+{
+    char *tab = (char *)realloc (obj->list, (obj->count + 1) * len);
+
+    if (unlikely(tab == NULL))
+        return VLC_ENOMEM;
+    memcpy(tab + (obj->count * len), data, len);
+    obj->list = tab;
+    obj->count++;
+    return VLC_SUCCESS;
+}
+
+# define VLC_PROBE_CONTINUE VLC_EGENERIC
+# define VLC_PROBE_STOP     VLC_SUCCESS
+
+# ifdef __cplusplus
+}
+# endif
+
+#endif