1 files changed, 77 insertions, 0 deletions
diff --git a/easytool/easycard.c b/easytool/easycard.c
new file mode 100644
index 0000000..32c71f3
--- /dev/null
+++ b/easytool/easycard.c
@@ -0,0 +1,77 @@
+/* A reverse-engineered implementation of the EasyCard data format */
+
+/* (C) 2010 by Harald Welte <laforge@gnumonks.org>
+ * All Rights Reserved
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 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 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.
+ *
+ */
+
+/* System includes */
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <stdint.h>
+#include <fcntl.h>
+#include <string.h>
+#include <time.h>
+#include <errno.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/mman.h>
+#include <netinet/in.h>
+
+/* libnfc includes */
+#include <nfc/nfc-types.h>
+#include <nfc/mifaretag.h>
+
+#include "mifare_classic.h"
+
+/* Easycard specific includes */
+#include "easycard.h"
+
+time_t easy_timestamp2time(const uint8_t *easy_ts)
+{
+	return (easy_ts[2] << 16 | easy_ts[1] << 8 | easy_ts[0]) << 8;
+}
+
+/* apply a telta (positive or negative) to a EasyCard log record */
+int easy_update_log_rec(struct easy_log_rec *elr, int16_t delta)
+{
+	int32_t sum = elr->amount + delta;
+	int32_t remaining = elr->remaining = delta;
+
+	if ((sum < 0 || sum > 0xffff) ||
+	    (remaining < 0 || remaining > 0xffff))
+		return -ERANGE;
+
+	elr->amount = sum;
+	elr->remaining = remaining;
+
+	return 0;
+}
+
+static char tsbuf[64];
+char *easy_asc_timestamp(const uint8_t *timestamp)
+{
+	time_t t_time = easy_timestamp2time(timestamp);
+	struct tm *t_tm = gmtime(&t_time);
+	memset(tsbuf, 0, sizeof(tsbuf));
+	snprintf(tsbuf, sizeof(tsbuf), "%4u-%02u-%02u %02u:%02u",
+		t_tm->tm_year+1900, t_tm->tm_mon+1, t_tm->tm_mday,
+		t_tm->tm_hour, t_tm->tm_min);
+	return tsbuf;
+}
+