/*--
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Copyright 2009-2010 by Stefan Rusterholz.
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All rights reserved.
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You can choose between MIT and BSD-3-Clause license. License file will be added later.
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--*/
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var misc = require('../core/utils/misc');
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var strValue = misc.BASE64_VALUES;
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/**
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* mixin cc.Codec.Base64
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*/
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var Base64 = {name:'Jacob__Codec__Base64'};
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/**
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* <p>
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* cc.Codec.Base64.decode(input[, unicode=false]) -> String (http://en.wikipedia.org/wiki/Base64).
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* </p>
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* @function
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* @param {String} input The base64 encoded string to decode
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* @return {String} Decodes a base64 encoded String
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* @example
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* //decode string
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* cc.Codec.Base64.decode("U29tZSBTdHJpbmc="); // => "Some String"
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*/
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Base64.decode = function Jacob__Codec__Base64__decode(input) {
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var output = [],
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chr1, chr2, chr3,
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enc1, enc2, enc3, enc4,
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i = 0;
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input = input.replace(/[^A-Za-z0-9\+\/\=]/g, "");
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while (i < input.length) {
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enc1 = strValue[input.charCodeAt(i++)];
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enc2 = strValue[input.charCodeAt(i++)];
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enc3 = strValue[input.charCodeAt(i++)];
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enc4 = strValue[input.charCodeAt(i++)];
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chr1 = (enc1 << 2) | (enc2 >> 4);
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chr2 = ((enc2 & 15) << 4) | (enc3 >> 2);
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chr3 = ((enc3 & 3) << 6) | enc4;
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output.push(String.fromCharCode(chr1));
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if (enc3 !== 64) {
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output.push(String.fromCharCode(chr2));
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}
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if (enc4 !== 64) {
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output.push(String.fromCharCode(chr3));
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}
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}
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output = output.join('');
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return output;
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};
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/**
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* <p>
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* Converts an input string encoded in base64 to an array of integers whose<br/>
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* values represent the decoded string's characters' bytes.
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* </p>
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* @function
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* @param {String} input The String to convert to an array of Integers
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* @param {Number} bytes
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* @return {Array}
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* @example
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* //decode string to array
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* var decodeArr = cc.Codec.Base64.decodeAsArray("U29tZSBTdHJpbmc=");
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*/
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Base64.decodeAsArray = function Jacob__Codec__Base64___decodeAsArray(input, bytes) {
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var dec = this.decode(input),
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ar = [], i, j, len;
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for (i = 0, len = dec.length / bytes; i < len; i++) {
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ar[i] = 0;
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for (j = bytes - 1; j >= 0; --j) {
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ar[i] += dec.charCodeAt((i * bytes) + j) << (j * 8);
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}
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}
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return ar;
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};
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module.exports = Base64;
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