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/* 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;
}
/* apply a delta to the 'sum of day' record in Sector 15 Block 2 */
int easy_update_sum_of_day(struct easy_sect15blk2 *s15b2, int16_t delta)
{
int32_t sum = s15b2->sum_of_day + delta;
if (sum < 0 || sum > 0xffff)
return -ERANGE;
s15b2->sum_of_day = sum;
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;
}
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