stream-pkg

#Stream-pkg

Stream-pkg is a simple tool for packages that transfered on stream-based API.
As we known, stream API is a good thing of Node.js and we could compose different applications by stream-based API conventionally. But package may be splited into small chunks when it transfered on stream-based API such as socket. We have to recompose the chunks into package when we receive them. And stream-pkg could do it for you.

##Installation
``
npm install stream-pkg
`

##Usage
` javascript
var Composer = require('stream-pkg');

var src = 'Hello world.';
var comp = new Composer();
// package to data
var res = comp.compose(src);

// data to package
comp.on('data', function(data) {
var str = data.toString('utf-8');
str.should.equal(src);
done();
});
comp.feed(res);
``

##API
###composer.compose(pkg)
Compose package into byte data.
####Arguments
+ pkg - String or Buffer. Package data.
+ return - Buffer that fill with package data.

###composer.feed(data, [offset], [end])
Feed data into composer.
####Arguments
+ data - Buffer. Next chunnk of data receive from stream.
+ offset - Number. Optional. Offset index of buffer that start to feed. Default is 0.
+ end - Number. Optional. End index (not includ) of buffer that stop to feed. Default is data.length.

##Event
###'data'(pkg)
Emit package by data event when the package has finished.
###'length_limit'(composer, data, offset)