unsigned short crc16(unsigned char *data, int length) {
unsigned short crc = 0xFFFF;
int i, j;
for (i = 0; i < length; i++) {
crc ^= (unsigned short)data[i];
for (j = 0; j < 8; j++) {
if (crc & 0x0001)
crc = (crc >> 1) ^ 0xA001;
else
crc >>= 1;
}
}
return crc;
}
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