'use strict'; var $ = require('../internals/export'); var global = require('../internals/global'); var uncurryThis = require('../internals/function-uncurry-this'); var anObjectOrUndefined = require('../internals/an-object-or-undefined'); var anUint8Array = require('../internals/an-uint8-array'); var base64Map = require('../internals/base64-map'); var getAlphabetOption = require('../internals/get-alphabet-option'); var base64Alphabet = base64Map.i2c; var base64UrlAlphabet = base64Map.i2cUrl; var Uint8Array = global.Uint8Array; var charAt = uncurryThis(''.charAt); // `Uint8Array.prototype.toBase64` method // https://github.com/tc39/proposal-arraybuffer-base64 if (Uint8Array) $({ target: 'Uint8Array', proto: true, forced: true }, { toBase64: function toBase64(/* options */) { var array = anUint8Array(this); var options = arguments.length ? anObjectOrUndefined(arguments[0]) : undefined; var alphabet = getAlphabetOption(options) === 'base64' ? base64Alphabet : base64UrlAlphabet; var result = ''; var i = 0; var length = array.length; var triplet; var at = function (shift) { return charAt(alphabet, (triplet >> (6 * shift)) & 63); }; for (; i + 2 < length; i += 3) { triplet = (array[i] << 16) + (array[i + 1] << 8) + array[i + 2]; result += at(3) + at(2) + at(1) + at(0); } if (i + 2 === length) { triplet = (array[i] << 16) + (array[i + 1] << 8); result += at(3) + at(2) + at(1) + '='; } else if (i + 1 === length) { triplet = array[i] << 16; result += at(3) + at(2) + '=='; } return result; } });