wrong length from nsIInputStream ??

[Marek Lewczuk]

I want to download file (synchronously) and something is wrong with 
nsIInputStream.available() - it returns wrong values.

var nsIIOService = 
Components.classes["@mozilla.org/network/io-service;1"].getService(Components.interfaces.nsIIOService);
var channel = nsIIOService.newChannelFromURI(nsIURI);
var iStream = channel.open();
var nsIScriptableInputStream = 
Components.classes["@mozilla.org/scriptableinputstream;1"].createInstance(Components.interfaces.nsIScriptableInputStream);
nsIScriptableInputStream.init(iStream);
alert(nsIScriptableInputStream.available()) - return 3450
alert(nsIScriptableInputStream.available()) - return 12345

What is wrong ?
Thanks in advance.
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