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#ifndef EASYCARD_H
#define EASYCARD_H
#include <nfc/nfc-types.h>
#include <nfc/mifaretag.h>
#include "utils.h"
#define EASY_TT_MRT_ENTER 0x00
#define EASY_TT_BUS 0x01
#define EASY_TT_MRT_REENTER 0x80
#define EASY_TT_MRT_EXIT 0x11
#define EASY_TT_PURCHASE 0x20
#define EASY_TT_RECHARGE 0x30
extern const struct value_string easy_tt_names[];
extern const struct value_string taipei_mrt_stn_id[];
/* Block 0 of Sector 2 seems to contain manufacturing timestamp */
struct easy_sect2blk0 {
uint8_t unknown[6];
uint8_t timestamp[3];
uint8_t unknown2[7];
} __attribute__ ((packed));
/* Block 2 of Sector 15 */
struct easy_sect15blk2 {
uint8_t unknown[11];
uint8_t day_of_month;
uint8_t unknown2; /* always 0x3d? */
uint16_t sum_of_day; /* sum of all shop purchases on a day */
uint8_t unknown3;
} __attribute__ ((packed));
/* Sector 7 */
struct easy_sect7blk {
uint8_t unknown[3];
uint8_t value1;
uint8_t station_code;
uint8_t unknown2[5];
uint8_t timestamp[3];
uint8_t unknown3[3];
} __attribute__ ((packed));
/* storage of a transaction log record on the transponder itself */
struct easy_log_rec {
uint8_t trans_id;
uint8_t unknown;
uint8_t timestamp[3]; /* seconds since January 1st 1970 / 256 */
uint8_t trans_type;
uint16_t amount; /* transaction amount / value */
uint16_t remaining; /* remaining value on card _after_ trans */
uint8_t unknown2;
uint8_t station_code; /* MRT station code */
uint16_t reader_code; /* unique code of RFID reader */
uint8_t unknown3[2];
} __attribute__ ((packed));
/* functions for data format conversion */
time_t easy_timestamp2time(const uint8_t *easy_ts);
char *easy_asc_timestamp(const uint8_t *timestamp);
/* functions to make a change to individual portions of the card */
/* apply a delta (positive or negative) to a EasyCard log record */
int easy_update_log_rec(struct easy_log_rec *elr, int16_t delta);
/* 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);
/* functions to make a comprehensive change, leave all card state in
* a consistent state */
/* positive value: make it more expensive. negative: cheaper */
int easy_alter_last_purchase(mifare_tag *mft, int16_t delta);
/* positive value: make it more expensive. negative: cheaper */
int easy_alter_last_recharge(mifare_tag *mft, int16_t delta);
/* functions to dump the transaction log */
/* dump a single log record */
void easy_dump_log_rec(const struct easy_log_rec *elr);
/* dump the entire transaction log */
void easy_dump_log(mifare_tag *mft);
#endif /* EASYCARD_H */
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