crc
Version:
Module for calculating Cyclic Redundancy Check (CRC) for Node.js and the browser.
17 lines (16 loc) • 501 B
JavaScript
const crc16xmodem = (current, previous) => {
let crc = typeof previous !== 'undefined' ? ~~previous : 0x0;
for (let index = 0; index < current.length; index++) {
let code = (crc >>> 8) & 0xff;
code ^= current[index] & 0xff;
code ^= code >>> 4;
crc = (crc << 8) & 0xffff;
crc ^= code;
code = (code << 5) & 0xffff;
crc ^= code;
code = (code << 7) & 0xffff;
crc ^= code;
}
return crc;
};
export default crc16xmodem;