#include "Crc16.h"

Crc16Class::Crc16Class() { }

unsigned short Crc16Class::ComputeChecksum(byte *data, int start, int length) {
    ushort fcs = 0xffff;
    for (int i = start; i < (start + length); i++)
    {
        byte index = (fcs ^ data[i]) & 0xff;
        fcs = (ushort)((fcs >> 8) ^ crc16_ccitt_table_reverse[index]);
    }
    fcs ^= 0xffff;
    return fcs;
}