function InStream(){ 
stream.Readable.call(this); 
} 
module.exports = InStream; 
var util = require("util"); 
var stream = require("stream"); 
util.inherits(InStream, stream.Readable); 
InStream.prototype._read = function (size){ 
} 
; 
InStream.prototype.addData = function (data){ 
this.push(data); 
} 
; 
InStream.prototype.end = function (){ 
this.push(null ); 
} 
;