How to know the APDU length that has been sent to the application?

[colkif]

Hi friends here. It's me again.

I wonder how to know the APDU length that has been sent to my application? Thanks.

[tomc2016]

Use the code below to know the length of data field.

Code: Select all

process(Apdu apdu)
{
    // Lc tells us the incoming apdu command length
     short bytesLeft = (short) (buffer[ISO7816.OFFSET_LC] & 0x00FF);
   // you may also use APDU class method
       short readCount = apdu.setIncomingAndReceive();
}

[Heerden]

It's better for you to look through Java card API specification.