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export function crc32(arr: Uint8Array | string): string {  if (typeof arr === "string") {    arr = new TextEncoder().encode(arr);  }  let crc = -1, i, j, l, temp, poly = 0xEDB88320;
  for (i = 0, l = arr.length; i < l; i += 1) {    temp = (crc ^ arr[i]) & 0xff;    for (j = 0; j < 8; j += 1) {      if ((temp & 1) === 1) {        temp = (temp >>> 1) ^ poly;      } else {        temp = (temp >>> 1);      }    }    crc = (crc >>> 8) ^ temp;  }
  return numberToHex(crc ^ -1);}
export class Crc32Stream {  private bytes: number[] = [];  private poly = 0xEDB88320;  private crc = 0 ^ -1;  private encoder = new TextEncoder();  #crc32: string = "";
  constructor() {    this.reset();  }
  get crc32(): string {    return this.#crc32;  }
  reset(): void {    this.#crc32 = "";    this.crc = 0 ^ -1;
    for (let n = 0; n < 256; n += 1) {      let c = n;      for (let k = 0; k < 8; k += 1) {        if (c & 1) {          c = this.poly ^ (c >>> 1);        } else {          c = c >>> 1;        }      }      this.bytes[n] = c >>> 0;    }  }
  append(arr: Uint8Array | string): string {    if (typeof arr === "string") {      arr = this.encoder.encode(arr);    }
    let crc = this.crc;
    for (let i = 0, l = arr.length; i < l; i += 1) {      crc = (crc >>> 8) ^ this.bytes[(crc ^ arr[i]) & 0xff];    }
    this.crc = crc;    this.#crc32 = numberToHex(crc ^ -1);    return this.#crc32;  }}
export function numberToHex(n: number): string {  return (n >>> 0).toString(16);}
export function hexToUint8Array(str: string): Uint8Array {  if (str.length === 0 || str.length % 2 !== 0) {    throw new Error(`The string "${str}" is not valid hex.`);  }  return new Uint8Array(    str.match(/.{1,2}/g)!.map((byte) => parseInt(byte, 16)),  );}
export function uint8ArrayToHex(bytes: Uint8Array): string {  return bytes.reduce(    (str, byte) => str + byte.toString(16).padStart(2, "0"),    "",  );}