60 lines
1.1 KiB
JavaScript
60 lines
1.1 KiB
JavaScript
'use strict';
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var Enc = require('./bytes.js');
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// to Base64
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function bufToBase64(buf) {
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// we want to maintain api compatability with browser APIs,
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// so we assume that this could be a Uint8Array
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return Buffer.from(buf).toString('base64');
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}
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Enc.bufToBase64 = bufToBase64;
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Enc.strToBase64 = function(str) {
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return Buffer.from(str).toString('base64');
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};
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// from Base64
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function base64ToBuf(b64) {
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// node handles URL Safe Base64 automatically
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return Buffer.from(b64, 'base64');
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}
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Enc.base64ToBuf = base64ToBuf;
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Enc.base64ToStr = function(b64) {
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return base64ToBuf(b64).toString('utf8');
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};
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// URL Safe Base64
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Enc.urlBase64ToBase64 = function(u64) {
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var r = u64 % 4;
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if (2 === r) {
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u64 += '==';
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} else if (3 === r) {
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u64 += '=';
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}
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return u64.replace(/-/g, '+').replace(/_/g, '/');
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};
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Enc.base64ToUrlBase64 = function(b64) {
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return b64
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.replace(/\+/g, '-')
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.replace(/\//g, '_')
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.replace(/=/g, '');
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};
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Enc.bufToUrlBase64 = function(buf) {
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return Enc.base64ToUrlBase64(bufToBase64(buf));
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};
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Enc.strToUrlBase64 = function(str) {
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return Enc.base64ToUrlBase64(bufToBase64(Buffer.from(str)));
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};
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module.exports = Enc;
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