libbase64

2019-02-14 admin

libbase64是什么

什么是libbase64,Encode and decode base64 encoded strings

libbase64使用教程帮助文档

libbase64

Encode and decode base64 strings.

Usage

Install with npm

npm install libbase64

Require in your script

const libbase64 = require('libbase64');

Encode values

Encode Buffer objects or unicode strings with

libbase64.encode(val) → String

Where

  • val is a Buffer or an unicode string

Example

libbase64.encode('jõgeva');
// asO1Z2V2YQ==

Wrap encoded values

To enforce soft line breaks on lines longer than selected amount of characters, use wrap

libbase64.wrap(str[, lineLength]) → String

Where

  • str is a base64 encoded string
  • lineLength (defaults to 76) is the maximum allowed line length

Example

libbase64.wrap('asO1Z2V2asO1Z2V2asO1Z2V2YQ==', 10);
// asO1Z2V2as\r\n
// O1Z2V2asO1\r\n
// Z2V2YQ==

Transform Streams

libbase64 makes it possible to encode and decode streams with libbase64.Encoder and libbase64.Decoder constructors.

Encoder Stream

Create new Encoder Stream with

const encoder = new libbase64.Encoder([options])

Where

  • options is the optional stream options object with an additional option lineLength if you want to use any other line length than the default 76 characters (or set to false to turn the soft wrapping off completely)

Example

The following example script reads in a file, encodes it to base64 and saves the output to a file.

const libbase64 = require('libbase64');
const fs = require('fs');
const source = fs.createReadStream('source.txt');
const encoded = fs.createReadStream('encoded.txt');
const encoder = new libbase64.Encoder();

source.pipe(encoder).pipe(encoded);

Decoder Stream

Create new Decoder Stream with

const decoder = new libbase64.Decoder([options])

Where

  • options is the optional stream options object

Example

The following example script reads in a file in base64 encoding, decodes it and saves the output to a file.

const libbase64 = require('libbase64');
const fs = require('fs');
const encoded = fs.createReadStream('encoded.txt');
const dest = fs.createReadStream('dest.txt');
const decoder = new libbase64.Decoder();

encoded.pipe(decoder).pipe(dest);

License

MIT

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