@balena/node-crc-utils

Node CRC32 Utils
==============

Combines two or more CRC32 checksums into new one.

##How to install:

``
npm install @balena/node-crc-utils
`

##How to build:

Install emscripten, clone this repo then
`
npm run build
`

##Example:

`javascript
const crcUtils = require('@balena/node-crc-utils');

// for crc32 checksum use lib: https://github.com/brianloveswords/buffer-crc32/
const crc32 = require('buffer-crc32');

const foo = Buffer.from('foo');
const bar = Buffer.from('bar');

const fooCrc32 = crc32(foo); //
const barCrc32 = crc32(bar); //

const foobar = Buffer.from('foobar');
const foobarCrc32 = crc32(foobar);

crcUtils.ready.then(() => {
const foobarCrc32Combined = crcUtils.crc32_combine(
fooCrc32.readUInt32BE(0),
barCrc32.readUInt32BE(0),
bar.length
);

// CRC32 are the same but Endianness is prepared for GZIP format
console.log(foobarCrc32); //
console.log(foobarCrc32Combined); //
});
``