Reverse Engineer Packer javascript
June 11th, 2009 Filed Under Good to know, Javascript, Tips & Tricks, browser, debuggers, firefox, gyan
Have you ever seen a code something like this:
eval(function(p,a,c,k,e,r){e=funct.... etc....
And you suffer reading the encoded code. No suffers now; because I am going to tell you a trick that will convert your packer code in a readable script.
And it is really simple …. just replace the eval word with alert and refresh your page. You can now copy the code from the alert box.
If you face the problem of copying it from the alert box then open firefox browser with firebug pre-installed.
Open the console using F12 key and paste the code in the editable window.
Now replace the first word “eval” with “console.log” and hit run.
Probably you would need Javascript Tidy to make it properly readable.
Enjoy Madi!!
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Firefox eats lot of memory?
April 2nd, 2009 Filed Under Good to know, Patch, Tips & Tricks, browser, firefox
Great!! that you came across the same road where I was chuckling for a while thinking and getting annoyed…
No doubt its a great browser; But the plugins eat a lots and tonnes of memory of your system and also by default it stores a lots of history for you…
So to lessload its history go to the Tools>Options>Privacy and reduce the history from 90(default) to 10 or less days.
But still, when you open multiple tabs you still find it hogging your system memory. To work with a different memory expensive application like Photoshop or Outlook or Eclipse.. you need a lot of memory…
So what to do?
No worries… open your firefox browser… type “about:config” (without quotes) in the address bar.
Hit enter. Now right click on the white space somewhere and choose New>Boolean…
An input box will appear..
Put “config.trim_on_minimize” (without quotes)…. Hit enter
Now choose “true” from the list and hit enter.Restart your browser… it will only hog the memory when you are using firefox… otherwise when you minimize it… the system memory hogged by firefox is released.
Check the status of your memory by using the Windows Task Manager. Enjoy the great browser and its plugins.
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javascript object looping
February 2nd, 2009 Filed Under Good to know, Javascript, Tips & Tricks, gyan
In javascript generally all of us must have seen the following construct.
for(i=0; i<arrayObj.length; i++)
{
// then the code
}
But more than 50% of the time you loop through some javascript object or some javascript array.
So in order to write less and convenient code, you can also write the same for in the following fashion
for(i in arrayObj)
{
//then the code
}
It pretty much does the same job of looping. The only difference is that it takes the help of the object to be looped through for looping.
And that means you cannot use this stylish construct for an artificial looping, because the for(i=0; i< ….. construct is nothing but artificial looping.
Someone will ask then how do we get the loop index. It is pretty straight forward to get the index in case of simple array. The “i” will always return the current index.
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Ajax Data - HTML vs. XML vs. JSON
December 19th, 2008 Filed Under Good to know, Javascript, Thinking Out Loud, Tips & Tricks, gyan, json
Ever wondered why Ajax stands for ‘Asynchronous Javascript And Xml’? I was thinking about it and realized that the ‘x’ is never used or let us say of almost no use.
Classically when introduced by Microsoft, xmlhttprequest object might have been thought to transport XML for the data transfers, as that was the most popular format which was known as the lightest in weight. But they forgot about the json.
Moreover, the scenario where we are standing today is really different than what had been thought earlier.
What was needed classically was to make a hidden request - get the response - inject in html - and show the result. But for this people started using the xmlhttp object as htmlhttp object. I mean rather than only transporting data, they are using HTML strings attached with the data(or the other way round).
I will show how can we make the request and response lighter and show results faster on the page so that the users don’t have to wait even on the dial up connections.
First let us compare the strings that are sent in a response in different formats.
HTML: <div class=”resultArea”><h3>This is the result of your query</h3><p><span>Request Num:</span>4564545<br/><span>Status:</span>Pending</p></div>
XML:
<resultArea>
<heading>This is the result of your query</heading>
<requestNum>4564545</requestNum>
<status>Pending</status>
</resultArea>
JSON:
{heading:”This is the result of your query”, requestNum:”4564545″, status:”Pending”}
Clearly you can see which one uses less number of characters.
Not only that, you are only an eval() away from start using the object with the luxury of (.) dot notations. What else do you need?
Had we been using HTML, we would have transported unnecessary HTML text along with the pure data to the browser. Just imagine the amount of repetitive HTML in case of a tabular data.
Using XML is also not so convinient because besides being bulky with its starting and ending tags, it is also needed to read via the DOM to traverse through the XML, which is time consuming, resource hungry and inconvinient code.
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Live TV on the internet
November 27th, 2008 Filed Under Good to know, utilities
Ever wanted to watch live TV with your broadband internet? Your will has come to reality.
Now you can watch live tv on a client software which can be downloaded from http://www.livestation.com/ for free.
I really enjoy watching BBC World News and other news channels. This is also good for the people who do not like to watch TV soaps with their better halves. Now no need to have a separate connection for just watching your TV.
Get connected and get updated.
Thanks to livestation.
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