| /* This Source Code Form is subject to the terms of the Mozilla Public |
| * License, v. 2.0. If a copy of the MPL was not distributed with this |
| * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ |
| |
| // From: http://hg.mozilla.org/mozilla-central/raw-file/ec10630b1a54/js/src/devtools/jint/sunspider/string-base64.js |
| |
| import * as Log from './util/logging.js'; |
| |
| export default { |
| /* Convert data (an array of integers) to a Base64 string. */ |
| toBase64Table: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='.split(''), |
| base64Pad: '=', |
| |
| encode(data) { |
| "use strict"; |
| let result = ''; |
| const length = data.length; |
| const lengthpad = (length % 3); |
| // Convert every three bytes to 4 ascii characters. |
| |
| for (let i = 0; i < (length - 2); i += 3) { |
| result += this.toBase64Table[data[i] >> 2]; |
| result += this.toBase64Table[((data[i] & 0x03) << 4) + (data[i + 1] >> 4)]; |
| result += this.toBase64Table[((data[i + 1] & 0x0f) << 2) + (data[i + 2] >> 6)]; |
| result += this.toBase64Table[data[i + 2] & 0x3f]; |
| } |
| |
| // Convert the remaining 1 or 2 bytes, pad out to 4 characters. |
| const j = length - lengthpad; |
| if (lengthpad === 2) { |
| result += this.toBase64Table[data[j] >> 2]; |
| result += this.toBase64Table[((data[j] & 0x03) << 4) + (data[j + 1] >> 4)]; |
| result += this.toBase64Table[(data[j + 1] & 0x0f) << 2]; |
| result += this.toBase64Table[64]; |
| } else if (lengthpad === 1) { |
| result += this.toBase64Table[data[j] >> 2]; |
| result += this.toBase64Table[(data[j] & 0x03) << 4]; |
| result += this.toBase64Table[64]; |
| result += this.toBase64Table[64]; |
| } |
| |
| return result; |
| }, |
| |
| /* Convert Base64 data to a string */ |
| /* eslint-disable comma-spacing */ |
| toBinaryTable: [ |
| -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
| -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,-1, |
| -1,-1,-1,-1, -1,-1,-1,-1, -1,-1,-1,62, -1,-1,-1,63, |
| 52,53,54,55, 56,57,58,59, 60,61,-1,-1, -1, 0,-1,-1, |
| -1, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9,10, 11,12,13,14, |
| 15,16,17,18, 19,20,21,22, 23,24,25,-1, -1,-1,-1,-1, |
| -1,26,27,28, 29,30,31,32, 33,34,35,36, 37,38,39,40, |
| 41,42,43,44, 45,46,47,48, 49,50,51,-1, -1,-1,-1,-1 |
| ], |
| /* eslint-enable comma-spacing */ |
| |
| decode(data, offset = 0) { |
| let data_length = data.indexOf('=') - offset; |
| if (data_length < 0) { data_length = data.length - offset; } |
| |
| /* Every four characters is 3 resulting numbers */ |
| const result_length = (data_length >> 2) * 3 + Math.floor((data_length % 4) / 1.5); |
| const result = new Array(result_length); |
| |
| // Convert one by one. |
| |
| let leftbits = 0; // number of bits decoded, but yet to be appended |
| let leftdata = 0; // bits decoded, but yet to be appended |
| for (let idx = 0, i = offset; i < data.length; i++) { |
| const c = this.toBinaryTable[data.charCodeAt(i) & 0x7f]; |
| const padding = (data.charAt(i) === this.base64Pad); |
| // Skip illegal characters and whitespace |
| if (c === -1) { |
| Log.Error("Illegal character code " + data.charCodeAt(i) + " at position " + i); |
| continue; |
| } |
| |
| // Collect data into leftdata, update bitcount |
| leftdata = (leftdata << 6) | c; |
| leftbits += 6; |
| |
| // If we have 8 or more bits, append 8 bits to the result |
| if (leftbits >= 8) { |
| leftbits -= 8; |
| // Append if not padding. |
| if (!padding) { |
| result[idx++] = (leftdata >> leftbits) & 0xff; |
| } |
| leftdata &= (1 << leftbits) - 1; |
| } |
| } |
| |
| // If there are any bits left, the base64 string was corrupted |
| if (leftbits) { |
| const err = new Error('Corrupted base64 string'); |
| err.name = 'Base64-Error'; |
| throw err; |
| } |
| |
| return result; |
| } |
| }; /* End of Base64 namespace */ |