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Description
===========

A very fast streaming multipart parser for node.js.

Benchmarks can be found [here](https://github.com/mscdex/dicer/wiki/Benchmarks).

Requirements
============

* [node.js](http://nodejs.org/) -- v10.0.0 or newer

Install
============

npm install dicer

Examples
========

* Parse an HTTP form upload

```js
const { inspect } = require('util');
const http = require('http');

const Dicer = require('dicer');

// Quick and dirty way to parse multipart boundary
const RE_BOUNDARY =
  /^multipart\/.+?(?:; boundary=(?:(?:"(.+)")|(?:([^\s]+))))$/i;
const HTML = Buffer.from(`
  <html><head></head><body>
    <form method="POST" enctype="multipart/form-data">
      <input type="text" name="textfield"><br />
      <input type="file" name="filefield"><br />
      <input type="submit">
    </form>
  </body></html>
`);
const PORT = 8080;

http.createServer((req, res) => {
  let m;
  if (req.method === 'POST'
      && req.headers['content-type']
      && (m = RE_BOUNDARY.exec(req.headers['content-type']))) {
    const d = new Dicer({ boundary: m[1] || m[2] });

d.on('part', (p) => {
      console.log('New part!');
      p.on('header', (header) => {
        for (const h in header) {
          console.log(
            `Part header: k: ${inspect(h)}, v: ${inspect(header[h])}`
          );
        }
      });
      p.on('data', (data) => {
        console.log(`Part data: ${inspect(data.toString())}`);
      });
      p.on('end', () => {
        console.log('End of part\n');
      });
    });
    d.on('finish', () => {
      console.log('End of parts');
      res.writeHead(200);
      res.end('Form submission successful!');
    });
    req.pipe(d);
  } else if (req.method === 'GET' && req.url === '/') {
    res.writeHead(200);
    res.end(HTML);
  } else {
    res.writeHead(404);
    res.end();
  }
}).listen(PORT, () => {
  console.log(`Listening for requests on port ${PORT}`);
});
```

API
===

_Dicer_ is a _Writable_ stream

Dicer (special) events
----------------------

* **finish**() - Emitted when all parts have been parsed and the Dicer instance has been ended.

* **part**(< _PartStream_ >stream) - Emitted when a new part has been found.

* **preamble**(< _PartStream_ >stream) - Emitted for preamble if you should happen to need it (can usually be ignored).

* **trailer**(< _Buffer_ >data) - Emitted when trailing data was found after the terminating boundary (as with the preamble, this can usually be ignored too).

Dicer methods
-------------

* **(constructor)**(< _object_ >config) - Creates and returns a new Dicer instance with the following valid `config` settings:

* **boundary** - _string_ - This is the boundary used to detect the beginning of a new part.

* **headerFirst** - _boolean_ - If true, preamble header parsing will be performed first.

* **maxHeaderPairs** - _integer_ - The maximum number of header key=>value pairs to parse **Default:** 2000 (same as node's http).

* **setBoundary**(< _string_ >boundary) - _(void)_ - Sets the boundary to use for parsing and performs some initialization needed for parsing. You should only need to use this if you set `headerFirst` to true in the constructor and are parsing the boundary from the preamble header.

_PartStream_ is a _Readable_ stream

PartStream (special) events
---------------------------

* **header**(< _object_ >header) - An object containing the header for this particular part. Each property value is an _array_ of one or more string values.

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