Use READ BINARY to read more than 256 bytes

Question

I am trying to read a smartcard(German Gesundheitskarte) using javax.smartcardio

In the definition of the EF \"PD\" its length is specified as 850 bytes. The conten

Answer 1

I tried the above exemple to read the DG2 file of a passport, but at the end, i was unable to get the image file. here is what i did in kotlin:

do {
            val offsetStart = (offset shr 8) and 0xFF
            val offsetEnd = offset and 0xFF

            LogUtils.d(offsetStart)
            LogUtils.d(offsetEnd)
            var offsetStartString = if(offsetStart < 10){
                "0$offsetStart"
            }else {
                "$offsetStart"
            }
            val offsetEndString = if(offsetEnd < 10){
                "0$offsetEnd"
            }else {
                "$offsetEnd"
            }
            LogUtils.d(offsetStartString)
            LogUtils.d("00B0${offsetStartString}${offsetEndString}00")
            val commandByte = toByteArray("00B0${offsetStartString}${offsetEndString}00")
            resultCommand = this.nfc.transmit(commandByte,commandByte.size)
            val resultHex = StringUtil.toHexString(resultCommand)
            LogUtils.d(resultHex)
            baos.write(resultCommand)
            offset += 1
            LogUtils.d(resultCommand.size)
        } while (resultCommand.size > 4)