@runejs/common/crc32/crc32.js

Common logging, networking, compression, and other miscellaneous functionality for RuneJS.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.Crc32 = void 0;
class Crc32 {
    static update(offset, size, data) {
        let crc = -1;
        for (let currentByte = offset; currentByte < size; currentByte++) {
            const tableIndex = 0xff & (crc ^ data[currentByte]);
            crc = this.crcLookupTable[tableIndex] ^ crc >>> 8;
        }
        crc ^= 0xffffffff;
        return crc;
    }
    static init() {
        for (let i = 0; i < 256; i++) {
            let currentByte = i;
            for (let bit = 0; bit < 8; bit++) {
                if ((currentByte & 0x1) !== 1) {
                    currentByte >>>= 1;
                }
                else {
                    currentByte = -306674912 ^ currentByte >>> 1;
                }
            }
            this.crcLookupTable[i] = currentByte;
        }
    }
}
exports.Crc32 = Crc32;
Crc32.crcLookupTable = new Array(256);
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