$ java -cp . NfcRaw --debug 0x7fffffffffffffff
Converting 9223372036854775807 (0x7fffffffffffffff)
ffff00ff03ffffff (-280379692941313)
tj@hephaestion:~/Hacking$ java -cp . NfcRaw --debug 0x0000ffffffffffff
Converting 281474976710655 (0x0000ffffffffffff)
ffff003f03ffffff (-281204326662145)
tj@hephaestion:~/Hacking$ java -cp . NfcRaw --debug --from 0xffff003f03ffffff
Exception in thread "main" java.lang.NumberFormatException: For input string: "ffff003f03ffffff"
at java.lang.NumberFormatException.forInputString(NumberFormatException.java:65)
at java.lang.Long.parseLong(Long.java:592)
at NfcRaw.main(NfcRaw.java:84)