123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657585960616263646566676869707172737475767778798081828384858687888990
// Ported from Go:// https://github.com/golang/go/tree/go1.13.10/src/hash/fnv/fnv.go// Copyright 2011 The Go Authors. All rights reserved. BSD license.// https://github.com/golang/go/blob/master/LICENSE// Copyright 2018-2021 the Deno authors. All rights reserved. MIT license.
import { mul64 } from "./util.ts";
const offset64Lo = 2216829733;const offset64Hi = 3421674724;const prime64Lo = 435;const prime64Hi = 256;
abstract class Fnv64Base<T> {  #stateHi: number;  #stateLo: number;
  constructor() {    this.#stateHi = offset64Hi;    this.#stateLo = offset64Lo;  }
  protected _updateState([newStateHi, newStateLo]: [number, number]): void {    this.#stateHi = newStateHi;    this.#stateLo = newStateLo;  }
  reset(): void {    this.#stateHi = offset64Hi;    this.#stateLo = offset64Lo;  }
  abstract write(data: Uint8Array): T;
  size(): number {    return 8;  }
  blockSize(): number {    return 1;  }
  sum64(): [number, number] {    return [this.#stateHi, this.#stateLo];  }
  sum(): Uint8Array {    return Uint8Array.from([      (this.#stateHi >> 24) & 0xff,      (this.#stateHi >> 16) & 0xff,      (this.#stateHi >> 8) & 0xff,      this.#stateHi & 0xff,      (this.#stateLo >> 24) & 0xff,      (this.#stateLo >> 16) & 0xff,      (this.#stateLo >> 8) & 0xff,      this.#stateLo & 0xff,    ]);  }}
/** Fnv64 hash */export class Fnv64 extends Fnv64Base<Fnv64> {  write(data: Uint8Array): Fnv64 {    let [hashHi, hashLo] = this.sum64();
    data.forEach((c) => {      [hashHi, hashLo] = mul64([hashHi, hashLo], [prime64Hi, prime64Lo]);      hashLo ^= c;    });
    this._updateState([hashHi, hashLo]);    return this;  }}
/** Fnv64a hash */export class Fnv64a extends Fnv64Base<Fnv64a> {  write(data: Uint8Array): Fnv64 {    let [hashHi, hashLo] = this.sum64();
    data.forEach((c) => {      hashLo ^= c;      [hashHi, hashLo] = mul64([hashHi, hashLo], [prime64Hi, prime64Lo]);    });
    this._updateState([hashHi, hashLo]);    return this;  }}