struct cackey_slot {
	int active;

	char *pcsc_reader;

	int pcsc_card_connected;
	SCARDHANDLE pcsc_card;

	int transaction_depth;
};

typedef enum {
	CACKEY_TLV_APP_GENERIC = 0x01,
	CACKEY_TLV_APP_SKI     = 0x02,
	CACKEY_TLV_APP_PKI     = 0x04
} cackey_tlv_apptype;

		if (scard_conn_ret != SCARD_S_SUCCESS) {
			CACKEY_DEBUG_PRINTF("Connection to card failed, returning in failure (SCardConnect() = %s/%li)", CACKEY_DEBUG_FUNC_SCARDERR_TO_STR(scard_conn_ret), (long) scard_conn_ret);

			return(CACKEY_PCSC_E_GENERIC);
		}

		slot->pcsc_card_connected = 1;
		slot->transaction_depth = 0;
	}

	return(CACKEY_PCSC_S_OK);
}

/*
 * SYNPOSIS

	cackey_conn_ret = cackey_connect_card(slot);
	if (cackey_conn_ret != CACKEY_PCSC_S_OK) {
		CACKEY_DEBUG_PRINTF("Unable to connect to card, returning in error");

		return(CACKEY_PCSC_E_GENERIC);
	}

	slot->transaction_depth++;

	if (slot->transaction_depth > 1) {
		CACKEY_DEBUG_PRINTF("Already in a transaction, performing no action (new depth = %i)", slot->transaction_depth);

		return(CACKEY_PCSC_S_OK);
	}

	scard_trans_ret = SCardBeginTransaction(slot->pcsc_card);
	if (scard_trans_ret != SCARD_S_SUCCESS) {
		CACKEY_DEBUG_PRINTF("Unable to begin transaction, returning in error");

		return(CACKEY_PCSC_E_GENERIC);
	}

	CACKEY_DEBUG_PRINTF("Sucessfully began transaction on slot (%s)", slot->pcsc_reader);

	return(CACKEY_PCSC_S_OK);
}

/*
 * SYNPOSIS
 *     cackey_ret cackey_end_transaction(struct cackey_slot *slot);

	CACKEY_DEBUG_PRINTF("Called.");

	if (!slot->pcsc_card_connected) {
		CACKEY_DEBUG_PRINTF("Card is not connected, unable to end transaction");

		return(CACKEY_PCSC_E_GENERIC);
	}

	if (slot->transaction_depth == 0) {
		CACKEY_DEBUG_PRINTF("Terminating a transaction that has not begun!");

		return(CACKEY_PCSC_E_GENERIC);
	}

	slot->transaction_depth--;

	if (slot->transaction_depth > 0) {
		CACKEY_DEBUG_PRINTF("Transactions still in progress, not terminating on-card Transaction (current depth = %i)", slot->transaction_depth);

		return(CACKEY_PCSC_E_GENERIC);
	}

	scard_trans_ret = SCardEndTransaction(slot->pcsc_card, SCARD_LEAVE_CARD);
	if (scard_trans_ret != SCARD_S_SUCCESS) {
		CACKEY_DEBUG_PRINTF("Unable to end transaction, returning in error");

		return(CACKEY_PCSC_E_GENERIC);
	}

	CACKEY_DEBUG_PRINTF("Sucessfully terminated transaction on slot (%s)", slot->pcsc_reader);

	return(CACKEY_PCSC_S_OK);
}

/* APDU Related Functions */
/*
 * SYNPOSIS

			xmit_buf[xmit_len++] = data[idx];
		}
	}

	if (le != 0x00) {
		xmit_buf[xmit_len++] = le;
	}

	/* Begin Smartcard Transaction */
	cackey_begin_transaction(slot);

	CACKEY_DEBUG_PRINTBUF("Sending APDU:", xmit_buf, xmit_len);

	recv_len = sizeof(recv_buf);
	scard_xmit_ret = SCardTransmit(slot->pcsc_card, SCARD_PCI_T0, xmit_buf, xmit_len, SCARD_PCI_T1, recv_buf, &recv_len);
	if (scard_xmit_ret != SCARD_S_SUCCESS) {
		CACKEY_DEBUG_PRINTF("Failed to send APDU to card (SCardTransmit() = %s/%lx)", CACKEY_DEBUG_FUNC_SCARDERR_TO_STR(scard_xmit_ret), (unsigned long) scard_xmit_ret);

		slot->transaction_depth = 0;

		if (scard_xmit_ret == SCARD_W_RESET_CARD) {
			CACKEY_DEBUG_PRINTF("Reset required, please hold...");

			scard_reconn_ret = SCardReconnect(slot->pcsc_card, SCARD_SHARE_SHARED, SCARD_PROTOCOL_T0, SCARD_RESET_CARD, &protocol);
			if (scard_reconn_ret == SCARD_S_SUCCESS) {
				/* Re-establish transaction, if it was present */
				if (slot->transaction_depth > 0) {
					slot->transaction_depth--;
					cackey_begin_transaction(slot);
				}

				CACKEY_DEBUG_PRINTF("Reset successful, retransmitting");
				scard_xmit_ret = SCardTransmit(slot->pcsc_card, SCARD_PCI_T0, xmit_buf, xmit_len, SCARD_PCI_T0, recv_buf, &recv_len);

				if (scard_xmit_ret != SCARD_S_SUCCESS) {
					CACKEY_DEBUG_PRINTF("Retransmit failed, returning in failure after disconnecting the card (SCardTransmit = %s/%li)", CACKEY_DEBUG_FUNC_SCARDERR_TO_STR(scard_xmit_ret), (long) scard_xmit_ret);

					SCardDisconnect(slot->pcsc_card, SCARD_RESET_CARD);
					slot->pcsc_card_connected = 0;

					/* End Smartcard Transaction */
					slot->transaction_depth = 1;
					cackey_end_transaction(slot);

					return(CACKEY_PCSC_E_GENERIC);
				}
			} else {
				CACKEY_DEBUG_PRINTF("Disconnecting card");

				SCardDisconnect(slot->pcsc_card, SCARD_RESET_CARD);
				slot->pcsc_card_connected = 0;

				/* End Smartcard Transaction */
				slot->transaction_depth = 1;
				cackey_end_transaction(slot);

				CACKEY_DEBUG_PRINTF("Returning in failure");
				return(CACKEY_PCSC_E_GENERIC);
			}
		} else {
			CACKEY_DEBUG_PRINTF("Disconnecting card");

			SCardDisconnect(slot->pcsc_card, SCARD_RESET_CARD);
			slot->pcsc_card_connected = 0;

			/* End Smartcard Transaction */
			slot->transaction_depth = 1;
			cackey_end_transaction(slot);

			CACKEY_DEBUG_PRINTF("Returning in failure");
			return(CACKEY_PCSC_E_GENERIC);
		}
	}

	CACKEY_DEBUG_PRINTBUF("Returned Value:", recv_buf, recv_len);

	if (recv_len < 2) {
		/* Minimal response length is 2 bytes, returning in failure */
		CACKEY_DEBUG_PRINTF("Response too small, returning in failure (recv_len = %lu)", (unsigned long) recv_len);

		/* End Smartcard Transaction */
		cackey_end_transaction(slot);

		return(CACKEY_PCSC_E_GENERIC);
	}

	/* Determine result code */
	major_rc = recv_buf[recv_len - 2];
	minor_rc = recv_buf[recv_len - 1];

	if (major_rc == 0x61) {
		/* We need to READ */
		CACKEY_DEBUG_PRINTF("Buffer read required");

		pcsc_getresp_ret = cackey_send_apdu(slot, GSCIS_CLASS_ISO7816, GSCIS_INSTR_GET_RESPONSE, 0x00, 0x00, 0, NULL, minor_rc, respcode, respdata, &tmp_respdata_len);
		if (pcsc_getresp_ret != CACKEY_PCSC_S_OK) {
			CACKEY_DEBUG_PRINTF("Buffer read failed!  Returning in failure");

			/* End Smartcard Transaction */
			cackey_end_transaction(slot);

			return(CACKEY_PCSC_E_GENERIC);
		}

		if (respdata_len) {
			*respdata_len += tmp_respdata_len;
		}

		/* End Smartcard Transaction */
		cackey_end_transaction(slot);

		CACKEY_DEBUG_PRINTF("Returning in success (buffer read complete)");
		return(CACKEY_PCSC_S_OK);
	}

	/* End Smartcard Transaction */
	cackey_end_transaction(slot);

	if (major_rc == 0x90) {
		/* Success */
		CACKEY_DEBUG_PRINTF("Returning in success (major_rc = 0x90)");

		return(CACKEY_PCSC_S_OK);
	}

 */
static struct cackey_pcsc_identity *cackey_read_certs(struct cackey_slot *slot, struct cackey_pcsc_identity *certs, unsigned long *count) {
	struct cackey_pcsc_identity *curr_id;
	struct cackey_tlv_entity *ccc_tlv, *ccc_curr, *app_tlv, *app_curr;
	unsigned char ccc_aid[] = {GSCIS_AID_CCC};
	unsigned char curr_aid[7];
	unsigned long outidx = 0;
	cackey_ret transaction_ret;
	int certs_resizable;
	int send_ret, select_ret;

	CACKEY_DEBUG_PRINTF("Called.");

	if (count == NULL) {
		CACKEY_DEBUG_PRINTF("count is NULL, returning in failure");

		return(NULL);
	}

	if (*count == 0) {
		if (certs != NULL) {
			CACKEY_DEBUG_PRINTF("Requested we return 0 objects, short-circuit");

			return(certs);
		}
	}

	/* Begin a SmartCard transaction */
	transaction_ret = cackey_begin_transaction(slot);
	if (transaction_ret != CACKEY_PCSC_S_OK) {
		CACKEY_DEBUG_PRINTF("Unable begin transaction, returning in failure");

		return(NULL);
	}

	if (certs == NULL) {
		certs = malloc(sizeof(*certs) * 5);
		*count = 5;
		certs_resizable = 1;
	} else {
		certs_resizable = 0;