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// 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 { mul32 } from "./util.ts";
const offset32 = 2166136261;const prime32 = 16777619;
abstract class Fnv32Base<T> {  #state: number;
  constructor() {    this.#state = offset32;  }
  protected _updateState(newState: number): void {    this.#state = newState;  }
  reset(): void {    this.#state = offset32;  }
  abstract write(data: Uint8Array): T;
  size(): number {    return 4;  }
  blockSize(): number {    return 1;  }
  sum32(): number {    return this.#state;  }
  sum(): Uint8Array {    return Uint8Array.from([      (this.#state >> 24) & 0xff,      (this.#state >> 16) & 0xff,      (this.#state >> 8) & 0xff,      this.#state & 0xff,    ]);  }}
/** Fnv32 hash */export class Fnv32 extends Fnv32Base<Fnv32> {  write(data: Uint8Array): Fnv32 {    let hash = this.sum32();
    data.forEach((c) => {      hash = mul32(hash, prime32);      hash ^= c;    });
    this._updateState(hash);    return this;  }}
/** Fnv32a hash */export class Fnv32a extends Fnv32Base<Fnv32a> {  write(data: Uint8Array): Fnv32a {    let hash = this.sum32();
    data.forEach((c) => {      hash ^= c;      hash = mul32(hash, prime32);    });
    this._updateState(hash);    return this;  }}