ft8d/crc10.c

static unsigned short table[256] =
{
    0x0000, 0x048f, 0x091e, 0x0d91, 0x123c, 0x16b3, 0x1b22, 0x1fad,
    0x24f7, 0x2078, 0x2de9, 0x2966, 0x36cb, 0x3244, 0x3fd5, 0x3b5a,
    0x49ee, 0x4d61, 0x40f0, 0x447f, 0x5bd2, 0x5f5d, 0x52cc, 0x5643,
    0x6d19, 0x6996, 0x6407, 0x6088, 0x7f25, 0x7baa, 0x763b, 0x72b4,
    0x93dc, 0x9753, 0x9ac2, 0x9e4d, 0x81e0, 0x856f, 0x88fe, 0x8c71,
    0xb72b, 0xb3a4, 0xbe35, 0xbaba, 0xa517, 0xa198, 0xac09, 0xa886,
    0xda32, 0xdebd, 0xd32c, 0xd7a3, 0xc80e, 0xcc81, 0xc110, 0xc59f,
    0xfec5, 0xfa4a, 0xf7db, 0xf354, 0xecf9, 0xe876, 0xe5e7, 0xe168,
    0x2737, 0x23b8, 0x2e29, 0x2aa6, 0x350b, 0x3184, 0x3c15, 0x389a,
    0x03c0, 0x074f, 0x0ade, 0x0e51, 0x11fc, 0x1573, 0x18e2, 0x1c6d,
    0x6ed9, 0x6a56, 0x67c7, 0x6348, 0x7ce5, 0x786a, 0x75fb, 0x7174,
    0x4a2e, 0x4ea1, 0x4330, 0x47bf, 0x5812, 0x5c9d, 0x510c, 0x5583,
    0xb4eb, 0xb064, 0xbdf5, 0xb97a, 0xa6d7, 0xa258, 0xafc9, 0xab46,
    0x901c, 0x9493, 0x9902, 0x9d8d, 0x8220, 0x86af, 0x8b3e, 0x8fb1,
    0xfd05, 0xf98a, 0xf41b, 0xf094, 0xef39, 0xebb6, 0xe627, 0xe2a8,
    0xd9f2, 0xdd7d, 0xd0ec, 0xd463, 0xcbce, 0xcf41, 0xc2d0, 0xc65f,
    0x4ee1, 0x4a6e, 0x47ff, 0x4370, 0x5cdd, 0x5852, 0x55c3, 0x514c,
    0x6a16, 0x6e99, 0x6308, 0x6787, 0x782a, 0x7ca5, 0x7134, 0x75bb,
    0x070f, 0x0380, 0x0e11, 0x0a9e, 0x1533, 0x11bc, 0x1c2d, 0x18a2,
    0x23f8, 0x2777, 0x2ae6, 0x2e69, 0x31c4, 0x354b, 0x38da, 0x3c55,
    0xdd3d, 0xd9b2, 0xd423, 0xd0ac, 0xcf01, 0xcb8e, 0xc61f, 0xc290,
    0xf9ca, 0xfd45, 0xf0d4, 0xf45b, 0xebf6, 0xef79, 0xe2e8, 0xe667,
    0x94d3, 0x905c, 0x9dcd, 0x9942, 0x86ef, 0x8260, 0x8ff1, 0x8b7e,
    0xb024, 0xb4ab, 0xb93a, 0xbdb5, 0xa218, 0xa697, 0xab06, 0xaf89,
    0x69d6, 0x6d59, 0x60c8, 0x6447, 0x7bea, 0x7f65, 0x72f4, 0x767b,
    0x4d21, 0x49ae, 0x443f, 0x40b0, 0x5f1d, 0x5b92, 0x5603, 0x528c,
    0x2038, 0x24b7, 0x2926, 0x2da9, 0x3204, 0x368b, 0x3b1a, 0x3f95,
    0x04cf, 0x0040, 0x0dd1, 0x095e, 0x16f3, 0x127c, 0x1fed, 0x1b62,
    0xfa0a, 0xfe85, 0xf314, 0xf79b, 0xe836, 0xecb9, 0xe128, 0xe5a7,
    0xdefd, 0xda72, 0xd7e3, 0xd36c, 0xccc1, 0xc84e, 0xc5df, 0xc150,
    0xb3e4, 0xb76b, 0xbafa, 0xbe75, 0xa1d8, 0xa557, 0xa8c6, 0xac49,
    0x9713, 0x939c, 0x9e0d, 0x9a82, 0x852f, 0x81a0, 0x8c31, 0x88be
};

short crc10(unsigned char const *data, int length)
{
    unsigned short remainder = 0;
    unsigned char index;
    int i;

    for(i = 0; i < length; ++i)
    {
        index = remainder >> 2;
        remainder <<= 8;
        remainder |= data[i];
        remainder ^= table[index];
    }

    return remainder & 0x03ff;
}

short crc10_check(unsigned char const *data, int length)
{
    return !crc10(data, length);
}