base64-u8array-arraybuffer/dist/base64-u8array-arraybuffer.esm.js

A simple, lightweight, and efficient JavaScript library to manage encoding/decoding between base64 data, Uint8Arrays, and ArrayBuffers

/*! base64-u8array-arraybuffer v1.0.3 | MIT */
const runningOnBrowser = typeof window !== 'undefined';

const base64urlToBase64 = base64UrlString => {
  // Replace non-url compatible chars with base64 standard chars
  const base64 = base64UrlString
    .replace(/-/g, '+')
    .replace(/_/g, '/');

  // Pad out with standard base64 required padding characters if missing
  const missingPadding = '='.repeat((4 - base64.length % 4) % 4);

  return base64 + missingPadding
};

const base64Decode = data => {
  if (runningOnBrowser) {
    return atob(data)
  }
  // atob polyfill for Node
  return Buffer.from(data, 'base64').toString('binary')
};

const base64Encode = data => {
  if (runningOnBrowser) {
    return btoa(data)
  }
  // btoa polyfill for Node
  return Buffer.from(data).toString('base64')
};

const base64ToUint8Array = base64String => {
  // base64 sanitizing
  const base64 = base64urlToBase64(base64String);

  // base64 decoding
  const rawData = base64Decode(base64);

  // Converting raw data to Uint8Array
  return Uint8Array.from(rawData, char => char.charCodeAt(0))
};

const typedArrayToBase64 = typedArray => {
  const string = typedArray.reduce((data, byte) => {
    return data + String.fromCharCode(byte)
  }, '');
  return base64Encode(string)
};

const uint8ArrayToBase64 = typedArrayToBase64;

const typedArrayToArrayBuffer = typedArray => {
  return typedArray.buffer
};

const uint8ArrayToArrayBuffer = typedArrayToArrayBuffer;

const arrayBufferToUint8Array = arrayBuffer => {
  return new Uint8Array(arrayBuffer)
};

const base64ToArrayBuffer = base64String => {
  const uint8Array = base64ToUint8Array(base64String);
  return uint8ArrayToArrayBuffer(uint8Array)
};

const arrayBufferToBase64 = arrayBuffer => {
  const uint8Array = arrayBufferToUint8Array(arrayBuffer);
  return uint8ArrayToBase64(uint8Array)
};

export { arrayBufferToBase64, arrayBufferToUint8Array, base64ToArrayBuffer, base64ToUint8Array, typedArrayToArrayBuffer, typedArrayToBase64, uint8ArrayToArrayBuffer, uint8ArrayToBase64 };