bluetooth: Create pa_bluetooth_discovery for BlueZ 5

pa_bluetooth_discovery is the struct that holds information about known
Bluetooth audio devices and other information about the Bluetooth stack.

This commit also creates bluez5-util.[ch], which will hold a lot of
utility functions to help with the BlueZ 5 support.

src/modules/bluetooth/bluez5-util.c

@@ -0,0 +1,74 @@
+/***
+  This file is part of PulseAudio.
+
+  Copyright 2008-2013 João Paulo Rechi Vita
+
+  PulseAudio 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.
+
+  PulseAudio 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 PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <pulse/xmalloc.h>
+
+#include <pulsecore/core.h>
+#include <pulsecore/macro.h>
+#include <pulsecore/refcnt.h>
+#include <pulsecore/shared.h>
+
+#include "bluez5-util.h"
+
+struct pa_bluetooth_discovery {
+    PA_REFCNT_DECLARE;
+
+    pa_core *core;
+};
+
+pa_bluetooth_discovery* pa_bluetooth_discovery_get(pa_core *c) {
+    pa_bluetooth_discovery *y;
+
+    if ((y = pa_shared_get(c, "bluetooth-discovery")))
+        return pa_bluetooth_discovery_ref(y);
+
+    y = pa_xnew0(pa_bluetooth_discovery, 1);
+    PA_REFCNT_INIT(y);
+    y->core = c;
+
+    pa_shared_set(c, "bluetooth-discovery", y);
+
+    return y;
+}
+
+pa_bluetooth_discovery* pa_bluetooth_discovery_ref(pa_bluetooth_discovery *y) {
+    pa_assert(y);
+    pa_assert(PA_REFCNT_VALUE(y) > 0);
+
+    PA_REFCNT_INC(y);
+
+    return y;
+}
+
+void pa_bluetooth_discovery_unref(pa_bluetooth_discovery *y) {
+    pa_assert(y);
+    pa_assert(PA_REFCNT_VALUE(y) > 0);
+
+    if (PA_REFCNT_DEC(y) > 0)
+        return;
+
+    pa_shared_remove(y->core, "bluetooth-discovery");
+    pa_xfree(y);
+}