2013-09-12 09:39:51 +08:00
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/*
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*
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* Licensed to the Apache Software Foundation (ASF) under one
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* or more contributor license agreements. See the NOTICE file
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* distributed with this work for additional information
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* regarding copyright ownership. The ASF licenses this file
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* to you under the Apache License, Version 2.0 (the
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* "License"); you may not use this file except in compliance
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* with the License. You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing,
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* software distributed under the License is distributed on an
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* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
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* KIND, either express or implied. See the License for the
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* specific language governing permissions and limitations
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* under the License.
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*
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*/
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2016-02-25 19:30:21 +08:00
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// jshint ignore: start
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2013-09-12 09:39:51 +08:00
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var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=',
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INVALID_CHARACTER_ERR = (function () {
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// fabricate a suitable error object
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try { document.createElement('$'); }
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catch (error) { return error; }
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}());
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// encoder
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// [https://gist.github.com/999166] by [https://github.com/nignag]
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window.btoa || (
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window.btoa = function (input) {
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for (
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// initialize result and counter
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var block, charCode, idx = 0, map = chars, output = '';
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// if the next input index does not exist:
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// change the mapping table to "="
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// check if d has no fractional digits
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input.charAt(idx | 0) || (map = '=', idx % 1) ;
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// "8 - idx % 1 * 8" generates the sequence 2, 4, 6, 8
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output += map.charAt(63 & block >> 8 - idx % 1 * 8)
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) {
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charCode = input.charCodeAt(idx += 3 / 4);
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if (charCode > 0xFF) throw INVALID_CHARACTER_ERR;
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block = block << 8 | charCode;
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}
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return output;
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});
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// decoder
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// [https://gist.github.com/1020396] by [https://github.com/atk]
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window.atob || (
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window.atob = function (input) {
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input = input.replace(/=+$/, '')
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if (input.length % 4 == 1) throw INVALID_CHARACTER_ERR;
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for (
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// initialize result and counters
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var bc = 0, bs, buffer, idx = 0, output = '';
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// get next character
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buffer = input.charAt(idx++) ;
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// character found in table? initialize bit storage and add its ascii value;
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~buffer && (bs = bc % 4 ? bs * 64 + buffer : buffer,
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// and if not first of each 4 characters,
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// convert the first 8 bits to one ascii character
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bc++ % 4) ? output += String.fromCharCode(255 & bs >> (-2 * bc & 6)) : 0
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) {
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// try to find character in table (0-63, not found => -1)
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buffer = chars.indexOf(buffer);
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}
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return output;
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});
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