/**
* Process the READ BINARY instruction (0xB0) ISO7816-4 Section 7.2.3
*
* <p>We handle only the INS == 0xB0 case.
*/
private void processReadBinary(APDU apdu) {
if (state != STATE_PERSONALISED) {
ISOException.throwIt(SW_CONDITIONS_NOT_SATISFIED);
}
byte[] buf = apdu.getBuffer();
byte p1 = buf[OFFSET_P1];
byte p2 = buf[OFFSET_P2];
short offset = 0;
short ef = -1;
if ((byte) (p1 & MASK_SFI) == MASK_SFI) {
byte sfi = (byte) (p1 & ~MASK_SFI);
if (sfi >= 0x1F) {
ISOException.throwIt(SW_INCORRECT_P1P2);
}
ef = fileSystem.findCurrentSFI(sfi);
if (ef == -1) {
ISOException.throwIt(SW_FILE_NOT_FOUND);
}
ef = fileSystem.fileStructure[ef];
offset = unsigned(p2);
} else {
ef = fileSystem.getCurrentIndex();
if (fileSystem.getFile(ef) == null) {
ISOException.throwIt(SW_COMMAND_NOT_ALLOWED);
}
offset = Util.makeShort(p1, p2);
}
byte[] file = fileSystem.getFile(ef);
if (offset > file.length) {
ISOException.throwIt(SW_INCORRECT_P1P2);
}
if (fileSystem.getPerm(ef) == FileSystem.PERM_PIN && !pin.isValidated()) {
ISOException.throwIt(SW_SECURITY_STATUS_NOT_SATISFIED);
}
short le = apdu.setOutgoing();
if (le == 0 || le == 256) {
le = (short) (file.length - offset);
if (le > 256) le = 256;
}
boolean eof = false;
if ((short) (file.length - offset) < le) {
le = (short) (file.length - offset);
eof = true;
}
apdu.setOutgoingLength(le);
apdu.sendBytesLong(file, offset, le);
if (eof) {
ISOException.throwIt(SW_END_OF_FILE);
}
}
/**
* Processes an incoming APDU.
*
* @see APDU
* @param apdu the incoming APDU
* @exception ISOException with the response bytes per ISO 7816-4
*/
public void process(APDU apdu) {
byte buffer[] = apdu.getBuffer();
short bytesRead = apdu.setIncomingAndReceive();
short echoOffset = (short) 0;
while (bytesRead > 0) {
Util.arrayCopyNonAtomic(buffer, ISO7816.OFFSET_CDATA, echoBytes, echoOffset, bytesRead);
echoOffset += bytesRead;
bytesRead = apdu.receiveBytes(ISO7816.OFFSET_CDATA);
}
apdu.setOutgoing();
apdu.setOutgoingLength((short) (echoOffset + 5));
// echo header
apdu.sendBytes((short) 0, (short) 5);
// echo data
apdu.sendBytesLong(echoBytes, (short) 0, echoOffset);
}
// Common method that sets the size of the output to the global variable size and sends the
// content of the global variable output
private void send(APDU apdu) {
apdu.setOutgoing();
apdu.setOutgoingLength(size);
apdu.sendBytesLong(output, (short) 0, size);
}