Download a binary file using sockets without known length

Hi all

I am trying to download a binary (.exe) file using the socket, where the length of the file is not known. Please take a look at the code I use:

var readBin = socketBin.read ();

<-here's the code that checks the http Content-length header field

; If the field length of the content is available, then I will use it to download files, otherwise continue with the following code-->

"pBar.reset (download plugin..", null); pBar.hit (readBin.length);

While (1)

{

binFil.write (readBin);     'binFil' is the file in which the uploaded file is written.

readBin = socketBin.read ();

pBar.hit (readBin.length);

If (socketBin.eof | readBin.length < = 0) {}

Break ;}

}

binFil.write (readBin);

binFil.close ();

socketBin.close ();

Problem is: I am able to download files within 10 seconds when the content length is known. But when the content length is not known, its about 1 and a half minute to download, also the progress bar gets hit for much of the time.

FYI: socket is opened in binary mode, file is downloaded correctly (even if it takes abt a minute). BTW Im using extendscript CS5.5

I am not able to understand where is the bug.

Hi, Srikanth:

Several points.

#1 during the validation of code, please use the web interface and the > icon and choose syntax highlighting > Java. Otherwise your code is simply too difficult to read and gets the poster.

#2 #1 apropos, your script, as written does not work, because this line:

url=url.replace(/([a-z]*):\/\/([-\._a-z0-9A-Z]*)(:[0-9]*)?\/?(.*)/,"$ 1/$2/$3/$4");

has an extra $ 1 space and should be this:

url=url.replace(/([a-z]*):\/\/([-\._a-z0-9A-Z]*)(:[0-9]*)?\/?(.*)/,"$1/$2/$3/$4");

Please take an extra moment to ensure that when ask you for help, you do so in a way that makes sense. Otherwise, it takes too much effort to help you, and it's frustrating.

#3 If equip them us your script by adding a line to the loop while():

            while (1)
            {
                binFil.write(readBin);
                readBin = socketBin.read();
                $.writeln(Date()+" Read "+readBin.length+" chars, eof is "+socketBin.eof);
                if(  readBin.length<=0){         break;}
            }

We get the output like this:

Mon Jul 11 2011 12:06:56 GMT-0400 Read 1024 chars, eof is false
Mon Jul 11 2011 12:06:56 GMT-0400 Read 1024 chars, eof is false
Mon Jul 11 2011 12:06:56 GMT-0400 Read 1024 chars, eof is false
Mon Jul 11 2011 12:06:56 GMT-0400 Read 631 chars, eof is false
Mon Jul 11 2011 12:07:06 GMT-0400 Read 0 chars, eof is false
Result: undefined

So, we can reasonably conclude that the last reading at the end of the stream returns a short read when the other side blocks.

Unfortunately, this is clearly insufficient since you can get short readings all the time.

I don't know why you say we do not know the length of the file, HTTP, it provides you the Content Length of the response field.

But the easy answer is to get the server to close for you. It's easy enough, with connection: close. Why were specify you

Connection: keep-alive, what? :

            var requestBin =
            "GET /" + parsedURLBin.path + " HTTP/1.1\n" +
            "Host: " + parsedURLBin.address + "\n" +
            "User-Agent: InDesign ExtendScript\n" +
            "Accept: */*\n" +
            //"Connection: keep-alive\n\n";
            "Connection: close\n"+
            "\n";

This gives a nice tidy:

Mon Jul 11 2011 12:26:19 GMT-0400 Read 1024 chars, eof is false
Mon Jul 11 2011 12:26:19 GMT-0400 Read 1024 chars, eof is false
Mon Jul 11 2011 12:26:19 GMT-0400 Read 1024 chars, eof is false
Mon Jul 11 2011 12:26:19 GMT-0400 Read 735 chars, eof is true
Mon Jul 11 2011 12:26:19 GMT-0400 Read 0 chars, eof is true

I suspect, you are better to use something like socketBin.read(64*1024) for a 64 k buffer size, but it doesn't seem to affect the on-the-wire protocol, so maybe its not so important.

If you do not want to answer on the server

Tags: InDesign

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