decodeLength method
Implementation
@override
int decodeLength(IsoBuffer buffer) {
int length = 0;
for (int i = 0; i < (digits + 1) ~/ 2; i++) {
final int byte = buffer.get();
length = 100 * length + ((byte & 0xF0) >> 4) * 10 + (byte & 0x0F);
}
return length;
}