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43 lines
1.1 KiB
JavaScript
Executable File
43 lines
1.1 KiB
JavaScript
Executable File
/* -*- Mode: js; js-indent-level: 2; -*- */
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/*
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* Copyright 2011 Mozilla Foundation and contributors
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* Licensed under the New BSD license. See LICENSE or:
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* http://opensource.org/licenses/BSD-3-Clause
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*/
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if (typeof define !== 'function') {
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var define = require('amdefine')(module, require);
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}
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define(function (require, exports, module) {
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var charToIntMap = {};
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var intToCharMap = {};
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'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/'
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.split('')
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.forEach(function (ch, index) {
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charToIntMap[ch] = index;
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intToCharMap[index] = ch;
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});
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/**
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* Encode an integer in the range of 0 to 63 to a single base 64 digit.
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*/
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exports.encode = function base64_encode(aNumber) {
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if (aNumber in intToCharMap) {
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return intToCharMap[aNumber];
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}
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throw new TypeError("Must be between 0 and 63: " + aNumber);
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};
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/**
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* Decode a single base 64 digit to an integer.
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*/
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exports.decode = function base64_decode(aChar) {
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if (aChar in charToIntMap) {
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return charToIntMap[aChar];
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}
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throw new TypeError("Not a valid base 64 digit: " + aChar);
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};
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});
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