Bytes Utils

Cross-platform utility library for working with byte-arrays and moving between formats.

Installation

1<script src="https://unpkg.com/@cmdcode/bytes-utils">

1yarn add @cmdcode/bytes-utils | npm install @cmdcode/bytes-utils

How to Use

1/* Buff class extends Uint8Array object
2 * and provides simple format conversion. 
3 */
4import { Buff } from '@cmdcode/bytes-utils'
5
6Buff
7  .str(strData)    => Buff<Uint8Array>
8  .hex(hexData)    => Buff<Uint8Array>
9  .num(numData)    => Buff<Uint8Array>
10  .big(bigData)    => Buff<Uint8Array>
11  .buff(buffer)    => Buff<Uint8Array>
12  .json(jsonData)  => Buff<Uint8Array>
13  .bech32(strData) => Buff<Uint8Array>
14  .base58(strData) => Buff<Uint8Array>
15  .base64(strData) => Buff<Uint8Array>
16
17new Buff(data: ArrayBufferLike, size: number)
18  .toStr()    => string
19  .toHex()    => hexstring
20  .toNum()    => number
21  .toBig()    => bigint
22  .toBytes()  => Uint8Array
23  .toJson()   => object
24  .toBech32() => b32string
25  .toBase58() => b58string
26  .toBase64() => b64string

1/* Bytes class extends the Buff object
2 * even further, adds byte manipualtion. 
3 */
4import { Bytes } from '@cmdcode/bytes-utils'
5
6Bytes
7  .varint(num: number)     => bytes // Returns a byte array of the varint.
8  .join(arr: Uint8Array[]) => bytes // Returns a concatenated byte array.    
9
10new Bytes(data: ArrayBufferLike, size: number)
11  .prepend(bytes: Uint8Array) => bytes // Returns prepended byte array.
12  .append(bytes: Uint8Array)  => bytes // Returns appended byte array.
13  .varint(num: number)        => bytes // Returns appended byte array.

1/* Stream class reads from a Uint8Array,
2 * and consumes the data on each read.
3 */
4import { Stream } from '@cmdcode/bytes-utils'
5
6new Stream(data: ArrayBufferLike)
7  .peek(len: number) => bytes // Reads the array, does not consume.
8  .read(len: number) => bytes // Reads the array, shrinks the array.
9  .varint() => number // Reads the next byte as varint, returns number.

1/* Type class is an extention of 'typeof',
2 * tries to determine a 'type' to any data.
3 */
4import { Type } from '@cmdcode/bytes-utils'
5
6Type.of(data: any) => string [
7  'undefined'
8  'infinity'
9  'null'
10  'hex'
11  'string'
12  'bigint'
13  'number'
14  'array'
15  'uint8'
16  'uint16'
17  'uint32'
18  'buffer'
19  'object'
20  'unknown'
21]

Issues

Please feel free to post any questions or bug reports on the issues page!

This library is currently in heavy development. Watch out for dragons!

Testing

This project uses tape for writing unit tests. I have a script that scans the API of each library and tries to import tests dynamically. The benefit of this is I can run the same tests on any bundle of the source code, so all bundle targets are tested (except cjs, gotta figure out one out).

There's also a test/index.html that will launch testing for the browser bundle, and test within the browser. Pretty neat!

Development

This project uses the following development tools:

• ESLint : For linting and catching linter errors.
• Prettier : For enforcing standard code formatting.
• Nyc : For test code coverage and reports.
• Rollup : Bundling/optimizing code for different platforms.
• Tape : A simple, easy to use testing library.
• Typescript : Type-checking and generating declaration files.

It should be straight-forward to setup a development environment:

1yarn install | npm install

Contributions

All contributions are welcome!