/** @ingroup emulation
* @brief Emulate a target
* @return Returns 0 on success, otherwise returns libnfc's error code (negative value).
*
* @param pnd \a nfc_device struct pointer that represents currently used device
* @param emulator \nfc_emulator struct point that handles input/output functions
*
* If timeout equals to 0, the function blocks indefinitely (until an error is raised or function is completed)
* If timeout equals to -1, the default timeout will be used
*/
int
nfc_emulate_target(nfc_device *pnd, struct nfc_emulator *emulator, const int timeout)
{
uint8_t abtRx[ISO7816_SHORT_R_APDU_MAX_LEN];
uint8_t abtTx[ISO7816_SHORT_C_APDU_MAX_LEN];
int res;
if ((res = nfc_target_init(pnd, emulator->target, abtRx, sizeof(abtRx), timeout)) < 0) {
return res;
}
size_t szRx = res;
int io_res = res;
while (io_res >= 0) {
io_res = emulator->state_machine->io(emulator, abtRx, szRx, abtTx, sizeof(abtTx));
if (io_res > 0) {
if ((res = nfc_target_send_bytes(pnd, abtTx, io_res, timeout)) < 0) {
return res;
}
}
if (io_res >= 0) {
if ((res = nfc_target_receive_bytes(pnd, abtRx, sizeof(abtRx), timeout)) < 0) {
return res;
}
szRx = res;
}
}
return io_res;
}
bool receive_bytes (void)
{
if (!nfc_target_receive_bytes(pnd,abtRx,&szRx)) {
nfc_perror (pnd, "nfc_target_receive_bytes");
exit(EXIT_FAILURE);
}
// Show received answer
if (!quiet_output) {
printf ("Received data: ");
print_hex (abtRx, szRx);
}
// Succesful transfer
return true;
}