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# engine.io-parser
[![Build Status](https://secure.travis-ci.org/socketio/engine.io-parser.svg)](http://travis-ci.org/socketio/engine.io-parser)
[![NPM version](https://badge.fury.io/js/engine.io-parser.svg)](http://badge.fury.io/js/engine.io-parser)
This is the JavaScript parser for the engine.io protocol encoding,
shared by both
[engine.io-client](https://github.com/socketio/engine.io-client) and
[engine.io](https://github.com/socketio/engine.io).
## How to use
### Standalone
The parser can encode/decode packets, payloads, and payloads as binary
with the following methods: `encodePacket`, `decodePacket`, `encodePayload`,
`decodePayload`, `encodePayloadAsBinary`, `decodePayloadAsBinary`.
The browser-side parser also includes `encodePayloadAsArrayBuffer` and `encodePayloadAsBlob`.
Example:
```js
var parser = require('engine.io-parser');
var data = new Buffer(5);
for (var i = 0; i < data.length; i++) { data[i] = i; }
parser.encodePacket({ type: 'message', data: data }, function(encoded) {
var decodedData = parser.decodePacket(encoded); // { type: 'message', data: data }
});
```
### With browserify
Engine.IO Parser is a commonjs module, which means you can include it by using
`require` on the browser and package using [browserify](http://browserify.org/):
1. install the parser package
```shell
npm install engine.io-parser
```
1. write your app code
```js
var parser = require('engine.io-parser');
var testBuffer = new Int8Array(10);
for (var i = 0; i < testBuffer.length; i++) testBuffer[i] = i;
var packets = [{ type: 'message', data: testBuffer.buffer }, { type: 'message', data: 'hello' }];
parser.encodePayload(packets, function(encoded) {
parser.decodePayload(encoded,
function(packet, index, total) {
var isLast = index + 1 == total;
if (!isLast) {
var buffer = new Int8Array(packet.data); // testBuffer
} else {
var message = packet.data; // 'hello'
}
});
});
```
1. build your app bundle
```bash
$ browserify app.js > bundle.js
```
1. include on your page
```html
<script src="/path/to/bundle.js"></script>
```
## Features
- Runs on browser and node.js seamlessly
- Runs inside HTML5 WebWorker
- Can encode and decode packets
- Encodes from/to ArrayBuffer or Blob when in browser, and Buffer or ArrayBuffer in Node
## API
Note: `cb(type)` means the type is a callback function that contains a parameter of type `type` when called.
### Node
- `encodePacket`
- Encodes a packet.
- **Parameters**
- `Object`: the packet to encode, has `type` and `data`.
- `data`: can be a `String`, `Number`, `Buffer`, `ArrayBuffer`
- `Boolean`: optional, binary support
- `Function`: callback, returns the encoded packet (`cb(String)`)
- `decodePacket`
- Decodes a packet. Data also available as an ArrayBuffer if requested.
- Returns data as `String` or (`Blob` on browser, `ArrayBuffer` on Node)
- **Parameters**
- `String` | `ArrayBuffer`: the packet to decode, has `type` and `data`
- `String`: optional, the binary type
- `encodeBase64Packet`
- Encodes a packet with binary data in a base64 string (`String`)
- **Parameters**
- `Object`: the packet to encode, has `type` and `data`
- `Function`: callback, returns the base64 encoded message (`cb(String)`)
- `decodeBase64Packet`
- Decodes a packet encoded in a base64 string.
- **Parameters**
- `String`: the base64 encoded message
- `String`: optional, the binary type
- `encodePayload`
- Encodes multiple messages (payload).
- If any contents are binary, they will be encoded as base64 strings. Base64
encoded strings are marked with a b before the length specifier
- **Parameters**
- `Array`: an array of packets
- `Boolean`: optional, binary support
- `Function`: callback, returns the encoded payload (`cb(String)`)
- `decodePayload`
- Decodes data when a payload is maybe expected. Possible binary contents are
decoded from their base64 representation.
- **Parameters**
- `String`: the payload
- `String`: optional, the binary type
- `Function`: callback, returns (cb(`Object`: packet, `Number`:packet index, `Number`:packet total))
- `encodePayloadAsBinary`
- Encodes multiple messages (payload) as binary.
- **Parameters**
- `Array`: an array of packets
- `Function`: callback, returns the encoded payload (`cb(Buffer)`)
- `decodePayloadAsBinary`
- Decodes data when a payload is maybe expected. Strings are decoded by
interpreting each byte as a key code for entries marked to start with 0. See
description of encodePayloadAsBinary.
- **Parameters**
- `Buffer`: the buffer
- `String`: optional, the binary type
- `Function`: callback, returns the decoded packet (`cb(Object)`)
### Browser
- `encodePayloadAsArrayBuffer`
- Encodes multiple messages (payload) as binary.
- **Parameters**
- `Array`: an array of packets
- `Function`: callback, returns the encoded payload (`cb(ArrayBuffer)`)
- `encodePayloadAsBlob`
- Encodes multiple messages (payload) as blob.
- **Parameters**
- `Array`: an array of packets
- `Function`: callback, returns the encoded payload (`cb(Blob)`)
## Tests
Standalone tests can be run with `make test` which will run both node.js and browser tests.
Browser tests are run using [zuul](https://github.com/defunctzombie/zuul).
(You must have zuul setup with a saucelabs account.)
You can run the tests locally using the following command:
```
./node_modules/.bin/zuul --local 8080 -- test/index.js
```
## Support
The support channels for `engine.io-parser` are the same as `socket.io`:
- irc.freenode.net **#socket.io**
- [Google Groups](http://groups.google.com/group/socket_io)
- [Website](http://socket.io)
## Development
To contribute patches, run tests or benchmarks, make sure to clone the
repository:
```bash
git clone git://github.com/LearnBoost/engine.io-parser.git
```
Then:
```bash
cd engine.io-parser
npm install
```
See the `Tests` section above for how to run tests before submitting any patches.
## License
MIT

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