git.r.bdr.sh - rbdr/dotfiles/blob

   1 /* -*- Mode: js; js-indent-level: 2; -*- */
   2 /*
   3  * Copyright 2011 Mozilla Foundation and contributors
   4  * Licensed under the New BSD license. See LICENSE or:
   5  * http://opensource.org/licenses/BSD-3-Clause
   6  */
   7 if (typeof define !== 'function') {
   8     var define = require('amdefine')(module, require);
   9 }
  10 define(function (require, exports, module) {
  11
  12   var charToIntMap = {};
  13   var intToCharMap = {};
  14
  15   'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
  16     .split('')
  17     .forEach(function (ch, index) {
  18       charToIntMap[ch] = index;
  19       intToCharMap[index] = ch;
  20     });
  21
  22   /**
  23    * Encode an integer in the range of 0 to 63 to a single base 64 digit.
  24    */
  25   exports.encode = function base64_encode(aNumber) {
  26     if (aNumber in intToCharMap) {
  27       return intToCharMap[aNumber];
  28     }
  29     throw new TypeError("Must be between 0 and 63: " + aNumber);
  30   };
  31
  32   /**
  33    * Decode a single base 64 digit to an integer.
  34    */
  35   exports.decode = function base64_decode(aChar) {
  36     if (aChar in charToIntMap) {
  37       return charToIntMap[aChar];
  38     }
  39     throw new TypeError("Not a valid base 64 digit: " + aChar);
  40   };
  41
  42 });