How to let APDU buffer accept 200 bytes of data

[Asineshjil]

According to the javadoc:

The APDU class maintains a byte array buffer which is used to transfer incoming APDU header and data bytes as well as outgoing data. The buffer length must be at least 133 bytes ( 5 bytes of header and 128 bytes of data ).

I need the buffer read and store the data with length 200 bytes. But the APDU buffer only accepts the first 128 bytes of the data.

What can I do now to let the buffer accept the rest bytes of data?
What is the specific meaning of this sentence "The buffer length must be at least 133 bytes ( 5 bytes of header and 128 bytes of data )."? Hope someone help me out.

[Larson]

To read incoming data more than 128 bytes you may need to call APDU.receiveBytes() to accept the rest vytes of data.

Similarly, for sending data, APDU.sendBytes() might be needed to send longer data.

[Bob2002]

Code: Select all

     /**
     * 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 );
    }

[Bob2002]

Code: Select all

       ...
　　byte[] buffer = apdu.getBuffer();
　　short bytes_left = (short) buffer[ISO.OFFSET_LC];
　　short readCount = apdu.setIncomingAndReceive();
　　while (bytes_left > 0) {
　　// Process received data in buffer; copy chunk to temp buf.
　　Util.arrayCopy(buffer, ISO.OFFSET_CDATA, tbuf, 0, readCount);
　　bytes_left -= readCount;
　　// Get more data
　　readCount = apdu.receiveBytes(ISO.OFFSET_CDDATA);
　　}
　　...
　　

[Asineshjil]

Use these two methods :receiveBytes() and sendBytes() can solve my problem. I got it. Thanks for all the kind help.

[Hernrye]

Use these two methods :receiveBytes() and sendBytes() can solve my problem. I got it. Thanks for all the kind help.

[Hernrye]

Use these two methods :receiveBytes() and sendBytes() can solve my problem. I got it. Thanks for all the kind help.