// Connection management methods
private void timeTick(APDU apdu) {
// Updates the area code according to the passed parameter.
byte[] buffer = apdu.getBuffer();
byte numBytes = (byte) (buffer[ISO7816.OFFSET_LC]);
byte byteRead = (byte) (apdu.setIncomingAndReceive());
if ((numBytes != 2) || (byteRead != 2)) ISOException.throwIt(ISO7816.SW_WRONG_LENGTH);
// get area code
short newAreaCode =
(short)
((short) (buffer[ISO7816.OFFSET_CDATA] << (short) 8)
| (short) (buffer[ISO7816.OFFSET_CDATA + 1] & 0x00FF));
if (newAreaCode != INACTIVE_AREA) {
activeAreaCode[0] = newAreaCode;
} else {
resetConnection();
ISOException.throwIt(SW_NO_NETWORK);
}
short connectionType = apdu.getProtocol();
byte b = apdu.getCLAChannel();
boolean contactless = false;
if ((connectionType & 0xf0) == 0x80 // APDU.PROTOCOL_MEDIA_CONTACTLESS_TYPE_A
|| (connectionType & 0xf0) == 0x90) { // APDU.PROTOCOL_MEDIA_CONTACTLESS_TYPE_B ){
contactless = true;
}
// If a connection is active, the user account is debited.
// If user runs out of credits, the connection is terminated.
if (connectionStatus[0] == CONNECTION_INUSE) {
if (AccountAccessor.getAccount() == null) {
ISOException.throwIt(SW_NO_ACCOUNT);
}
if (AccountAccessor.getAccount().debit(activeAreaCode[0], contactless) == false) {
resetConnection();
ISOException.throwIt(SW_NEGATIVE_BALANCE);
}
}
}
private void setConnection() {
if (AccountAccessor.getAccount() == null) {
ISOException.throwIt(SW_NO_ACCOUNT);
}
if (connectionStatus[0] == CONNECTION_INUSE) {
ISOException.throwIt(SW_CONNECTION_BUSY);
}
if (activeAreaCode[0] == INACTIVE_AREA) {
ISOException.throwIt(SW_NO_NETWORK);
}
// The first time unit is charged at connection setup
if (AccountAccessor.getAccount().debit(activeAreaCode[0], false)) {
connectionStatus[0] = CONNECTION_INUSE;
} else {
ISOException.throwIt(SW_NEGATIVE_BALANCE);
}
}