acosj.java

package de.tsenger.u2f;

import javacard.framework.APDU;
import javacard.framework.Applet;
import javacard.framework.ISO7816;

public class AcosJPatch {
	public static short getOffsetCdata(APDU apdu) {
		byte[] buffer = apdu.getBuffer();
		short offset = apdu.getOffsetCdata();
		if (offset == ISO7816.OFFSET_EXT_CDATA) {
			try {
				short lc = apdu.getIncomingLength();
				short blc = (short)(0x00FF & buffer[ISO7816.OFFSET_LC]);
				if (lc <= 0xFF) {
					if (blc == lc) {
						return ISO7816.OFFSET_CDATA;
					}
				}
			} finally {
				// nothing to do
			}
			return ISO7816.OFFSET_EXT_CDATA;
		} else {
			return ISO7816.OFFSET_CDATA;
		}
	}
}