@technobuddha/library/crc32/crc32.cjs

A large library of useful functions

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
exports.crc32 = void 0;
var isEmpty_1 = __importDefault(require("lodash/isEmpty"));
var crcTable = [];
/**
 * Compute the CRC32 checksum for a string
 *
 * @param input The string
 * @return the CRC32 checksum
 */
function crc32(input) {
    if (isEmpty_1.default(crcTable)) {
        for (var n = 0; n < 256; ++n) {
            var c = n;
            for (var k = 0; k < 8; ++k)
                c = ((c & 1) ? (0xEDB88320 ^ (c >>> 1)) : (c >>> 1));
            crcTable[n] = c;
        }
    }
    var crc = -1;
    for (var i = 0; i < input.length; ++i)
        crc = (crc >>> 8) ^ crcTable[(crc ^ input.charCodeAt(i)) & 0xFF];
    return (crc ^ -1) >>> 0;
}
exports.crc32 = crc32;
exports.default = crc32;