/* 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 dataLength = data.indexOf('=') - offset; if (dataLength < 0) { dataLength = data.length - offset; } /* Every four characters is 3 resulting numbers */ const resultLength = (dataLength >> 2) * 3 + Math.floor((dataLength % 4) / 1.5); const result = new Array(resultLength); // 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 */