X-Git-Url: http://git.rot13.org/?a=blobdiff_plain;f=src%2Frfid_proto_mifare_classic.c;h=e98dc28e33a3e193de34c225a2902b46e84f724e;hb=683a381a3ef8d2c1c1f0c47337808d6a72e1309f;hp=4032b8013917df1a28c4fc26ae1934ad3568f5b5;hpb=3703fbd7ddc9068bddc59dc9096affda5ecb170d;p=librfid

diff --git a/src/rfid_proto_mifare_classic.c b/src/rfid_proto_mifare_classic.c
index 4032b80..e98dc28 100644
--- a/src/rfid_proto_mifare_classic.c
+++ b/src/rfid_proto_mifare_classic.c
@@ -82,7 +82,7 @@ mfcl_write(struct rfid_protocol_handle *ph, unsigned int page,
 	unsigned int i;
 	unsigned char tx[18];
 	unsigned char rx[1];
-	unsigned int rx_len;
+	unsigned int rx_len = sizeof(rx);
 	int ret;
 
 	if (page > MIFARE_CL_PAGE_MAX)
@@ -140,6 +140,35 @@ mfcl_write(struct rfid_protocol_handle *ph, unsigned int page,
 	return ret;
 }
 
+static int 
+mfcl_getopt(struct rfid_protocol_handle *ph, int optname, void *optval,
+	    unsigned int *optlen)
+{
+	int ret = -EINVAL;
+	u_int16_t atqa;
+	unsigned int atqa_size = sizeof(atqa);
+	unsigned int *size = optval;
+
+	switch (optname) {
+	case RFID_OPT_PROTO_SIZE:
+		if (*optlen < sizeof(*size))
+			return -EINVAL;
+		*optlen = sizeof(*size);
+		ret = 0;
+		rfid_layer2_getopt(ph->l2h, RFID_OPT_14443A_ATQA,
+				   (void *) &atqa, &atqa_size);
+		if (atqa == 0x0004)
+			*size = 1024;
+		else if (atqa == 0x0002)
+			*size = 4096;
+		else
+			ret = -EIO;
+		break;
+	}
+
+	return ret;
+}
+
 static struct rfid_protocol_handle *
 mfcl_init(struct rfid_layer2_handle *l2h)
 {
@@ -169,6 +198,7 @@ const struct rfid_protocol rfid_protocol_mfcl = {
 		.read		= &mfcl_read,
 		.write 		= &mfcl_write,
 		.fini		= &mfcl_fini,
+		.getopt		= &mfcl_getopt,
 	},
 };