pwabuilder-lib/lib/manifestTools/manifestCreator/scrapers/icojs/src/utils/bit-array.js

PWA Builder Core Library

'use strict';

var bitArray = {
  /**
   * convert ArrayBuffer to 1bit Array
   * @access private
   * @param {ArrayBuffer} buffer buffer
   * @returns {Array} bits array
   */
  of1: function(buffer) {
    var buff = new Uint8Array(buffer);
    var bit = '';
    for (var i = 0; i < buff.byteLength; i++) {
      bit += ('000000000' + buff[i].toString(2)).slice(-8);
    }
    return bit.split('').map(function(el) { return parseInt(el, 2); });
  },
  /**
   * convert ArrayBuffer to 4bit Array
   * @access private
   * @param {ArrayBuffer} buffer buffer
   * @returns {Array} bits array
   */
  of4: function(buffer) {
    var buff = new Uint8Array(buffer);
    var bit = '';
    for (var i = 0; i < buff.byteLength; i++) {
      bit += ('00' + buff[i].toString(16)).slice(-2);
    }
    return bit.split('').map(function(el) { return parseInt(el, 16); });
  },
  /**
   * convert ArrayBuffer to 8bit Array
   * @access private
   * @param {ArrayBuffer} buffer buffer
   * @returns {Array} bits array
   */
  of8: function(buffer) {
    var buff = new Uint8Array(buffer);
    var bit = [];
    for (var i = 0; i < buff.byteLength; i++) {
      bit.push(buff[i]);
    }
    return bit;
  }
};

module.exports = bitArray;