import { crcTable } from "./table" ; export class CRC { static computeCRC ( str ) { let crc = 0xffff ; let j , i ; for ( i = 0 ; i < str . length ; i ++ ) { const c = str . charCodeAt ( i ) ; if ( c > 255 ) throw new RangeError ( ) ; j = ( c ^ ( crc >> 8 ) ) & 0xff ; crc = crcTable [ j ] ^ ( crc << 8 ) ; } return ( ( ( crc ^ 0 ) & 0xffff ) . toString ( 16 ) . toUpperCase ( ) ) . padStart ( 4 , "0" ) ; } }