crc32hash

Deno module to calculate crc32 hash of a string, Uint8Array or ReadableStream.

This module exports 2 functions and 1 class:

function crc32(data: string | Uint8Array): number

function crc32Stream(stream: ReadableStream<Uint8Array>, bufferSize: number=8*1024): Promise<number>

class Crc32
{
📄 get value(): number
⚙ update(dataPart: string | Uint8Array): void
⚙ valueOf(): number
⚙ toString(): string
}

String:

import {crc32} from 'https://deno.land/x/crc32hash@v2.0.0/mod.ts';

console.log(crc32('abc'));

Uint8Array:

import {crc32} from 'https://deno.land/x/crc32hash@v2.0.0/mod.ts';

console.log(crc32(new Uint8Array([97, 98, 99])));

ReadableStream:

import {crc32Stream} from 'https://deno.land/x/crc32hash@v2.0.0/mod.ts';

const fileUrl = new URL(import.meta.url);
using fp = await Deno.open(fileUrl, {read: true});
console.log(await crc32Stream(fp.readable));

Data parts

import {crc32, Crc32} from 'https://deno.land/x/crc32hash@v2.0.0/mod.ts';
import {assertEquals} from 'https://deno.land/std@0.224.0/assert/assert_equals.ts';

const crc = new Crc32;

crc.update('Lorem ipsum ');
assertEquals(crc.value, crc32('Lorem ipsum '));

crc.update('dolor sit amet');
assertEquals(crc.value, crc32('Lorem ipsum dolor sit amet'));