get-bits

get-bits v1.0.1

Use this when you need to get/slice some bits at an arbitrary bit index from a byte or Uint8Array. This is something like a bit-array, bit vector, bit string, bit set, or whatever they are called. Should work equally well in browser or in node. These are only getters.

Usage

Install

If you're using Node.js type:

npm install --save get-bits

or

yarn add get-bits

Require

const { getBytes } = require('get-bits')

or

import { getUint32 } from 'get-bits'

const data = new Uint8Array([
  72, 87, 162, 219, 72, 0, 1, 233, 250, 17, 8, 242, 212, 110, 88, 191, 252, 101, 222, 0, 6])
getUint32(data, 0, 6) // 18
getUint32(data, 8, 30) // 367572690

API

subByte(num, start, length)

Bits from a number. Assuming you're working with an 8 bit number.

subByteLE(num, start, length)

Bits from a number Little Endian. Assuming you're working with an 8 bit number.

getUint32(Uint8Array, start, length)

getDataView(Uint8Array, start, length)

getBytes(Uint8Array, start, length)

get6Array()

Handy for Base64 encoding/decoding.

getIntOrBytes(Uint8Array, start, length, [get6=false])

getUint32LE()