- use C99 compiler flags

[librfid] / src / rfid_scan.c

diff --git a/src/rfid_scan.c b/src/rfid_scan.c
new file mode 100644 (file)
index 0000000..1abb4df
--- /dev/null
+++ b/src/rfid_scan.c
@@ -0,0 +1,113 @@
+/* RFID scanning implementation
+ *
+ * (C) 2006 by Harald Welte <laforge@gnumonks.org>
+ *
+ */
+
+/*
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License version 2 
+ *  as published by the Free Software Foundation
+ *
+ *  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 General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <librfid/rfid.h>
+#include <librfid/rfid_layer2.h>
+#include <librfid/rfid_reader.h>
+#include <librfid/rfid_protocol.h>
+
+static struct rfid_layer2_handle *
+rfid_layer2_scan1(struct rfid_reader_handle *rh, int l2)
+{
+       struct rfid_layer2_handle *l2h;
+
+       if (rh->reader->l2_supported & (1 << l2)) {
+               l2h = rfid_layer2_init(rh, l2);
+               if (!l2h)
+                       return NULL;
+               if (rfid_layer2_open(l2h) < 0) {
+                       rfid_layer2_fini(l2h);
+                       return NULL;
+               } else 
+                       return l2h;
+       }
+
+       return NULL;
+}
+
+static struct rfid_layer2_handle *
+rfid_layer2_scan(struct rfid_reader_handle *rh)
+{
+       struct rfid_layer2_handle *l2h;
+       int i;
+
+#define RFID_LAYER2_MAX 16
+       for (i = 0; i < RFID_LAYER2_MAX; i++) {
+               l2h = rfid_layer2_scan1(rh, i);
+               if (l2h)
+                       return l2h;
+       }
+
+       return NULL;
+}
+
+static struct rfid_protocol_handle *
+rfid_protocol_scan1(struct rfid_layer2_handle *l2h, int proto)
+{
+       struct rfid_protocol_handle *ph;
+
+       if (l2h->rh->reader->proto_supported & (1 << proto) &&
+           l2h->proto_supported & (1 << proto)) {
+               ph = rfid_protocol_init(l2h, proto);
+               if (!ph)
+                       return NULL;
+               if (rfid_protocol_open(ph) < 0) {
+                       rfid_protocol_fini(ph);
+                       return NULL;
+               } else
+                       return ph;
+       }
+
+       return NULL;
+}
+
+static struct rfid_protocol_handle *
+rfid_protocol_scan(struct rfid_layer2_handle *l2h)
+{
+       struct rfid_protocol_handle *ph;
+       int i;
+
+#define RFID_PROTOCOL_MAX 16
+       for (i = 0; i < RFID_PROTOCOL_MAX; i++) {
+               ph = rfid_protocol_scan1(l2h, i);
+               if (ph)
+                       return ph;
+       }
+
+       return NULL;
+}
+
+/* Scan for any RFID transponder within range of the given reader.
+ * Abort after the first successfully found transponder. */
+int rfid_scan(struct rfid_reader_handle *rh,
+             struct rfid_layer2_handle **l2h,
+             struct rfid_protocol_handle **ph)
+{
+       *l2h = rfid_layer2_scan(rh);
+       if (!*l2h)
+               return 0;
+       
+       *ph = rfid_protocol_scan(l2h);
+       if (!*ph)
+               return 2;
+       
+       return 3;
+}