53 lines
1.1 KiB
JavaScript
53 lines
1.1 KiB
JavaScript
'use strict';
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/*
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Encode functions adapted from:
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Version 1.0 12/25/99 Copyright (C) 1999 Masanao Izumo <iz@onicos.co.jp>
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http://www.onicos.com/staff/iz/amuse/javascript/expert/base64.txt
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*/
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const Stream = require('stream');
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const internals = {};
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exports.encode = function (buffer) {
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return Buffer.from(buffer.toString('base64'));
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};
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exports.Encoder = class Encoder extends Stream.Transform {
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constructor() {
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super();
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this._reminder = null;
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}
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_transform(chunk, encoding, callback) {
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let part = this._reminder ? Buffer.concat([this._reminder, chunk]) : chunk;
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const remaining = part.length % 3;
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if (remaining) {
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this._reminder = part.slice(part.length - remaining);
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part = part.slice(0, part.length - remaining);
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}
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else {
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this._reminder = null;
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}
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this.push(exports.encode(part));
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return callback();
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}
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_flush(callback) {
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if (this._reminder) {
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this.push(exports.encode(this._reminder));
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}
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return callback();
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}
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};
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