//-----------------------------------------------------------------------------
// Merlok - June 2011
// Gerhard de Koning Gans - May 2008
// Hagen Fritsch - June 2010
//
// This code is licensed to you under the terms of the GNU GPL, version 2 or,
// at your option, any later version. See the LICENSE.txt file for the text of
// the license.
//-----------------------------------------------------------------------------
// Routines to support ISO 14443 type A.
//-----------------------------------------------------------------------------

#ifndef __ISO14443A_H
#define __ISO14443A_H

#ifdef __cplusplus
extern "C" {
#endif

#include "usb_cmd.h"
#include "cmd.h"
#include "apps.h"
#include "util.h"
#include "string.h"
#include "crc16.h"
#include "mifaresniff.h"
#include "crapto1/crapto1.h"
#include "mifareutil.h"
#include "parity.h"
#include "mifare.h"  // structs

// When the PM acts as tag and is receiving it takes
// 2 ticks delay in the RF part (for the first falling edge),
// 3 ticks for the A/D conversion,
// 8 ticks on average until the start of the SSC transfer,
// 8 ticks until the SSC samples the first data
// 7*16 ticks to complete the transfer from FPGA to ARM
// 8 ticks until the next ssp_clk rising edge
// 4*16 ticks until we measure the time
// - 8*16 ticks because we measure the time of the previous transfer
#define DELAY_AIR2ARM_AS_TAG (2 + 3 + 8 + 8 + 7*16 + 8 + 4*16 - 8*16)

typedef struct {
    enum {
        DEMOD_UNSYNCD,
        // DEMOD_HALF_SYNCD,
        // DEMOD_MOD_FIRST_HALF,
        // DEMOD_NOMOD_FIRST_HALF,
        DEMOD_MANCHESTER_DATA
    } state;
    uint16_t twoBits;
    uint16_t highCnt;
    uint16_t bitCount;
    uint16_t collisionPos;
    uint16_t syncBit;
    uint8_t  parityBits;
    uint8_t  parityLen;
    uint16_t shiftReg;
    uint16_t samples;
    uint16_t len;
    uint32_t startTime, endTime;
    uint8_t  *output;
    uint8_t  *parity;
} tDemod;
/*
typedef enum {
    MOD_NOMOD = 0,
    MOD_SECOND_HALF,
    MOD_FIRST_HALF,
    MOD_BOTH_HALVES
    } Modulation_t;
*/

typedef struct {
    enum {
        STATE_UNSYNCD,
        STATE_START_OF_COMMUNICATION,
        STATE_MILLER_X,
        STATE_MILLER_Y,
        STATE_MILLER_Z,
        // DROP_NONE,
        // DROP_FIRST_HALF,
    } state;
    uint16_t shiftReg;
    int16_t bitCount;
    uint16_t len;
    //uint16_t byteCntMax;
    uint16_t posCnt;
    uint16_t syncBit;
    uint8_t  parityBits;
    uint8_t  parityLen;
    uint32_t fourBits;
    uint32_t startTime, endTime;
    uint8_t *output;
    uint8_t *parity;
} tUart;

#ifndef AddCrc14A
# define AddCrc14A(data, len) compute_crc(CRC_14443_A, (data), (len), (data)+(len), (data)+(len)+1)
#endif

#ifndef AddCrc14B
# define AddCrc14B(data, len) compute_crc(CRC_14443_B, (data), (len), (data)+(len), (data)+(len)+1)
#endif

#ifndef CheckCrc14A
# define	CheckCrc14A(data, len)	check_crc(CRC_14443_A, (data), (len))
#endif

void GetParity(const uint8_t *pbtCmd, uint16_t len, uint8_t *par);

tDemod *GetDemod(void);
void DemodReset(void);
void DemodInit(uint8_t *data, uint8_t *par);
tUart *GetUart(void);
void UartReset(void);
void UartInit(uint8_t *data, uint8_t *par);
RAMFUNC bool MillerDecoding(uint8_t bit, uint32_t non_real_time);
RAMFUNC int ManchesterDecoding(uint8_t bit, uint16_t offset, uint32_t non_real_time);

void RAMFUNC SniffIso14443a(uint8_t param);
void SimulateIso14443aTag(int tagType, int flags, uint8_t *data);
void iso14443a_antifuzz(uint32_t flags);
void ReaderIso14443a(UsbCommand *c);
void ReaderTransmit(uint8_t *frame, uint16_t len, uint32_t *timing);
void ReaderTransmitBitsPar(uint8_t *frame, uint16_t bits, uint8_t *par, uint32_t *timing);
void ReaderTransmitPar(uint8_t *frame, uint16_t len, uint8_t *par, uint32_t *timing);
int ReaderReceive(uint8_t *receivedAnswer, uint8_t *par);

void iso14443a_setup(uint8_t fpga_minor_mode);
int iso14_apdu(uint8_t *cmd, uint16_t cmd_len, bool send_chaining, void *data, uint8_t *res);
int iso14443a_select_card(uint8_t *uid_ptr, iso14a_card_select_t *p_card, uint32_t *cuid_ptr, bool anticollision, uint8_t num_cascades, bool no_rats);
int iso14443a_fast_select_card(uint8_t *uid_ptr, uint8_t num_cascades);
void iso14a_set_trigger(bool enable);

int EmSendPrecompiledCmd(tag_response_info_t *response_info);
int EmSendCmd14443aRaw(uint8_t *resp, uint16_t respLen);
int EmSend4bit(uint8_t resp);
int EmSendCmd(uint8_t *resp, uint16_t respLen);
int EmSendCmdEx(uint8_t *resp, uint16_t respLen, bool collision);
int EmGetCmd(uint8_t *received, uint16_t *len, uint8_t *par);
int EmSendCmdPar(uint8_t *resp, uint16_t respLen, uint8_t *par);
int EmSendCmdParEx(uint8_t *resp, uint16_t respLen, uint8_t *par, bool collision);
int EmSendPrecompiledCmd(tag_response_info_t *response_info);

void EmLogTraceReader(void);

bool prepare_allocated_tag_modulation(tag_response_info_t *response_info, uint8_t **buffer, size_t *max_buffer_size);

bool EmLogTrace(uint8_t *reader_data, uint16_t reader_len, uint32_t reader_StartTime, uint32_t reader_EndTime, uint8_t *reader_Parity,
                uint8_t *tag_data, uint16_t tag_len, uint32_t tag_StartTime, uint32_t tag_EndTime, uint8_t *tag_Parity);

void ReaderMifare(bool first_try, uint8_t block, uint8_t keytype);
void DetectNACKbug();

void AppendCrc14443a(uint8_t *data, int len);

#ifdef __cplusplus
}
#endif

#endif /* __ISO14443A_H */