bryc

/*
    Optimized CRC-16 for 0x1021 (unreflected)
    ----

    With this code, (5) CRC-16 variants can be modelled:

    crc=0x0000, xorout=0x0000 = CRC-16/XMODEM (default)
    crc=0xFFFF, xorout=0x0000 = CRC-16/IBM-3740
    crc=0xFFFF, xorout=0xFFFF = CRC-16/GENIBUS
    crc=0x0000, xorout=0xFFFF = CRC-16/GSM