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nodered/rootfs/data/node_modules/libbase64/README.md
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# libbase64
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Encode and decode base64 strings.
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## Usage
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Install with npm
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npm install libbase64
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Require in your script
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```javascript
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const libbase64 = require('libbase64');
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```
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### Encode values
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Encode Buffer objects or unicode strings with
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libbase64.encode(val) → String
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Where
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- **val** is a Buffer or an unicode string
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**Example**
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```javascript
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libbase64.encode('jõgeva');
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// asO1Z2V2YQ==
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```
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### Wrap encoded values
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To enforce soft line breaks on lines longer than selected amount of characters, use `wrap`
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libbase64.wrap(str[, lineLength]) → String
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Where
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- **str** is a base64 encoded string
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- **lineLength** (defaults to 76) is the maximum allowed line length
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**Example**
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```javascript
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libbase64.wrap('asO1Z2V2asO1Z2V2asO1Z2V2YQ==', 10);
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// asO1Z2V2as\r\n
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// O1Z2V2asO1\r\n
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// Z2V2YQ==
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```
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### Transform Streams
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`libbase64` makes it possible to encode and decode streams with `libbase64.Encoder` and `libbase64.Decoder` constructors.
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### Encoder Stream
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Create new Encoder Stream with
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const encoder = new libbase64.Encoder([options])
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Where
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- **options** is the optional stream options object
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- **options.lineLength** (Number) if you want to use any other line length than the default 76
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characters (or set to `false` to turn the soft wrapping off completely)
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- **options.skipStartBytes** (Number) Optional. How many bytes to skip from output (default to 0)
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- **options.limitOutbutBytes** (Number) Optional. How many bytes to return (defaults to all bytes)
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- **options.startPadding** (String) Optional. Fills first line with provided padding string. Usually goes together with skipStartBytes to get line folding correct.
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**Example**
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The following example script reads in a file, encodes it to base64 and saves the output to a file.
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```javascript
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const libbase64 = require('libbase64');
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const fs = require('fs');
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const source = fs.createReadStream('source.txt');
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const encoded = fs.createReadStream('encoded.txt');
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const encoder = new libbase64.Encoder();
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source.pipe(encoder).pipe(encoded);
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```
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### Decoder Stream
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Create new Decoder Stream with
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const decoder = new libbase64.Decoder([options])
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Where
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- **options** is the optional stream options object
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**Example**
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The following example script reads in a file in base64 encoding, decodes it and saves the output to a file.
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```javascript
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const libbase64 = require('libbase64');
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const fs = require('fs');
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const encoded = fs.createReadStream('encoded.txt');
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const dest = fs.createReadStream('dest.txt');
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const decoder = new libbase64.Decoder();
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encoded.pipe(decoder).pipe(dest);
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```
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## License
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**MIT**
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