@dash0/sdk-web/dist/modules/utils/crc32.js

Dash0's Web SDK to collect telemetry from end-users' web browsers

const POLYNOMIAL = 0xedb88320; // This is the standard polynomial used in IEEE 802.3 and must be in sync with the one we are using in the backend.
const TABLE = new Uint32Array(256);
for (let i = 0; i < 256; i++) {
    let c = i;
    for (let k = 0; k < 8; k++) {
        c = c & 1 ? POLYNOMIAL ^ (c >>> 1) : c >>> 1;
    }
    TABLE[i] = c >>> 0;
}
export function crc32(hexStr) {
    const bytes = new Uint8Array(hexStr.length / 2);
    for (let i = 0; i < hexStr.length; i += 2) {
        bytes[i / 2] = parseInt(hexStr.substring(i, i + 2), 16);
    }
    let crc = 0xffffffff;
    for (let i = 0; i < bytes.length; i++) {
        const byte = bytes[i];
        crc = (crc >>> 8) ^ TABLE[(crc ^ byte) & 0xff];
    }
    return (crc ^ 0xffffffff) >>> 0;
}