mobdb/dist/Base64.js

MarsDB is a lightweight client-side MongoDB-like database, Promise based, written in ES6

'use strict';

Object.defineProperty(exports, "__esModule", {
  value: true
});

var _createClass = function () { function defineProperties(target, props) { for (var i = 0; i < props.length; i++) { var descriptor = props[i]; descriptor.enumerable = descriptor.enumerable || false; descriptor.configurable = true; if ("value" in descriptor) descriptor.writable = true; Object.defineProperty(target, descriptor.key, descriptor); } } return function (Constructor, protoProps, staticProps) { if (protoProps) defineProperties(Constructor.prototype, protoProps); if (staticProps) defineProperties(Constructor, staticProps); return Constructor; }; }();

function _classCallCheck(instance, Constructor) { if (!(instance instanceof Constructor)) { throw new TypeError("Cannot call a class as a function"); } }

/**
 * Based on Meteor's Base64 package.
 * Rewrite with ES6 and better formated for passing
 * linter
 */
var BASE_64_CHARS = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/';
var BASE_64_VALS = {};

(function setupBase64Vals() {
  for (var j = 0; j < BASE_64_CHARS.length; j++) {
    BASE_64_VALS[BASE_64_CHARS.charAt(j)] = j;
  }
})();

var getChar = function getChar(val) {
  return BASE_64_CHARS.charAt(val);
};

var getVal = function getVal(ch) {
  if (ch === '=') {
    return -1;
  }
  return BASE_64_VALS[ch];
};

// Base 64 encoding

var Base64 = exports.Base64 = function () {
  function Base64() {
    _classCallCheck(this, Base64);
  }

  _createClass(Base64, [{
    key: 'encode',
    value: function encode(array) {
      if (typeof array === 'string') {
        var str = array;
        array = this.newBinary(str.length);
        for (var i = 0; i < str.length; i++) {
          var ch = str.charCodeAt(i);
          if (ch > 0xFF) {
            throw new Error('Not ascii. Base64.encode can only take ascii strings.');
          }
          array[i] = ch;
        }
      }

      var answer = [];
      var a = null;
      var b = null;
      var c = null;
      var d = null;
      for (var _i = 0; _i < array.length; _i++) {
        switch (_i % 3) {
          case 0:
            a = array[_i] >> 2 & 0x3F;
            b = (array[_i] & 0x03) << 4;
            break;
          case 1:
            b |= array[_i] >> 4 & 0xF;
            c = (array[_i] & 0xF) << 2;
            break;
          case 2:
            c |= array[_i] >> 6 & 0x03;
            d = array[_i] & 0x3F;
            answer.push(getChar(a));
            answer.push(getChar(b));
            answer.push(getChar(c));
            answer.push(getChar(d));
            a = null;
            b = null;
            c = null;
            d = null;
            break;
        }
      }
      if (a != null) {
        answer.push(getChar(a));
        answer.push(getChar(b));
        if (c == null) {
          answer.push('=');
        } else {
          answer.push(getChar(c));
        }
        if (d == null) {
          answer.push('=');
        }
      }
      return answer.join('');
    }
  }, {
    key: 'decode',
    value: function decode(str) {
      var len = Math.floor(str.length * 3 / 4);
      if (str.charAt(str.length - 1) == '=') {
        len--;
        if (str.charAt(str.length - 2) == '=') {
          len--;
        }
      }
      var arr = this.newBinary(len);

      var one = null;
      var two = null;
      var three = null;

      var j = 0;

      for (var i = 0; i < str.length; i++) {
        var c = str.charAt(i);
        var v = getVal(c);
        switch (i % 4) {
          case 0:
            if (v < 0) {
              throw new Error('invalid base64 string');
            }
            one = v << 2;
            break;
          case 1:
            if (v < 0) {
              throw new Error('invalid base64 string');
            }
            one |= v >> 4;
            arr[j++] = one;
            two = (v & 0x0F) << 4;
            break;
          case 2:
            if (v >= 0) {
              two |= v >> 2;
              arr[j++] = two;
              three = (v & 0x03) << 6;
            }
            break;
          case 3:
            if (v >= 0) {
              arr[j++] = three | v;
            }
            break;
        }
      }
      return arr;
    }
  }, {
    key: 'newBinary',
    value: function newBinary(len) {
      if (typeof Uint8Array === 'undefined' || typeof ArrayBuffer === 'undefined') {
        var ret = [];
        for (var i = 0; i < len; i++) {
          ret.push(0);
        }
        ret.$Uint8ArrayPolyfill = true;
        return ret;
      }
      return new Uint8Array(new ArrayBuffer(len));
    }
  }]);

  return Base64;
}();

exports.default = new Base64();