Google Toolbar V3.x/4.x Pagerank Checksum Algorithm

Gavin Shaw

Sep 26 2006, 03:10 AM

Toolbar V 4.0.x Pagerank checksum caculator

CODE

#!/usr/bin/php
<?php

/*
  Google PageRank Checksum Algorithm (Toolbar 3.x/4.x)
  http://www.gamesaga.net/pagerank/
  http://www.upsdn.net/
*/

error_reporting(E_ALL);

function StrToNum($Str, $Check, $Magic)
{
    $Int32Unit = 4294967296;  // 2^32

    $length = strlen($Str);
    for ($i = 0; $i < $length; $i++) {
        $Check *= $Magic;
        //If the float is beyond the boundaries of integer (usually +/- 2.15e+9 = 2^31),
        //  the result of converting to integer is undefined
        //  refer to http://www.php.net/manual/en/language.types.integer.php
        if (is_float($Check)) {
            $Check = ($Check - $Int32Unit * (int) ($Check / $Int32Unit));
            // - 2^31
            $Check = ($Check < -2147483647) ? ($Check + $Int32Unit) : $Check;
        }
        $Check += ord($Str{$i});
    }
    return $Check;
}

function HashURL($String)
{
    $Check1 = StrToNum($String, 0x1505, 0x21);
    $Check2 = StrToNum($String, 0, 0x1003F);

    $Check1 >>= 2;
    $Check1 = (($Check1 >> 4) & 0x3FFFFC0 ) | ($Check1 & 0x3F);
    $Check1 = (($Check1 >> 4) & 0x3FFC00 ) | ($Check1 & 0x3FF);
    $Check1 = (($Check1 >> 4) & 0x3C000 ) | ($Check1 & 0x3FFF);

    $T1 = (((($Check1 & 0x3C0) << 4) | ($Check1 & 0x3C)) <<2 ) | ($Check2 & 0xF0F );
    $T2 = (((($Check1 & 0xFFFFC000) << 4) | ($Check1 & 0x3C00)) << 0xA) | ($Check2 & 0xF0F0000 );

    return ($T1 | $T2);
}

function CheckHash($Hashnum)
{
    $CheckByte = 0;
    $Flag = 0;

    $HashStr = sprintf('%u', $Hashnum);
    $length = strlen($HashStr);

    for ($i = $length - 1;  $i >= 0;  $i --) {
        $Re = $HashStr{$i};
        if (1 == ($Flag % 2)) {
            $Re += $Re;
            $Re = (int)($Re / 10) + ($Re % 10);
        }
        $CheckByte += $Re;
        $Flag ++;
    }

    $CheckByte %= 10;
    if (0 !== $CheckByte) {
        $CheckByte = 10 - $CheckByte;
        if (1 === ($Flag%2) ) {
            if (1 === ($CheckByte % 2)) {
                $CheckByte += 9;
            }
            $CheckByte >>= 1;
        }
    }

    return '7'.$CheckByte.$HashStr;
}

if ($argc == 2) {
    echo CheckHash(HashURL($argv[1]));
} else {
    exit ("please specify a URL,for example: http://www.upsdn.net/\n");
}

?>

I have tested on Debian GNU/Linux etch

QUOTE

PHP 5.1.6-1 (cli) (built: Sep 1 2006 13:52:26)

Linux sagas 2.6.16-2-686 #1 Fri Aug 18 19:01:49 UTC 2006 i686 GNU/Linux

Niru

Sep 26 2006, 09:16 AM

hey,
how can I run this script?
Is it for any webpages or some other stuff??

( Sorry to ask you such a newbie question! I'm not that much into scripting and all!

)

Quatrux

Sep 26 2006, 12:53 PM

I just looked over the script and I think you could give a description some kind of what page rank it shows? I think it won't work, from where do you get the variable $argc? and where it should check the page rank? by the letters and numbers in the domain? I think it might be just one part of the script? I don't really understand

Or it should be used somewhere I don't know? For example if a user will find this post from google search, he won't understand? Or this is just me who does not understand..

CaptainRon

Sep 26 2006, 03:08 PM

Hey why isn't even a definition of the Code snippet provided?

I can't figure out what this code would do...

Can you please elaborate would it accomplishes?

Gavin Shaw

Oct 2 2006, 01:46 AM

QUOTE(Niran @ Sep 26 2006, 09:16 AM)

hey,
how can I run this script?
Is it for any webpages or some other stuff??

( Sorry to ask you such a newbie question! I'm not that much into scripting and all!

)

This is a Command Line Script.

if you save it as pagerank.php, you can open a shell, then run the command

CODE

$php pagerank.php

2005-09-13 v0.1 first release
2005-10-21 v1.1 fix a bug for the final character
2006-09-21 v1.2 compatible with PHP 4.4/PHP 5.x
2006-09-29 v1.3 X86_64 CPU supported

Gavin Shaw

Oct 2 2006, 02:26 AM

QUOTE(Quatrux @ Sep 26 2006, 12:53 PM)

Or it should be used somewhere I don't know? For example if a user will find this post from google search, he won't understand? Or this is just me who does not understand..

Thank your reply.

The code above is a complete CLI script,which get $argc and $argv from the shell command line

please refer to
http://www.php.net/manual/en/intro-whatcando.php

Server-side scripting demo
http://pagerank.gamesaga.net/

Server-side scripting source code
http://pagerank.gamesaga.net/pagerank.php.zip

Gavin Shaw

Oct 2 2006, 02:49 AM

QUOTE(CaptainRon @ Sep 26 2006, 03:08 PM)

Hey why isn't even a definition of the Code snippet provided?

I can't figure out what this code would do...

Can you please elaborate would it accomplishes?

It's a complete scripting.

I have added comments to the source code

Server-side scripting source code
http://pagerank.gamesaga.net/pagerank.zip

CODE

/*
* convert a string to a 32-bit integer
* the string maybe is your webpage's url
*/
function StrToNum($Str, $Check, $Magic)

/*
* Genearate a hash string from a url
*/
function HashURL($String)

/*
* genearate a checksum for the hash string
*/
function CheckHash($Hashnum)

$C = "<a href=\"http://www.google.com/search?client=navclient-auto&features=Rank:&q=info:";
$E = "\">Get PageRank</a>";

if (isset ($_GET['url'])) {
echo $C.$_GET['url'].'&ch='.CheckHash(HashURL($_GET['url'])).$E;
}

If the scripting get a url parameter from your browser, it will generate a checksum for the url

Gavin Shaw

Oct 6 2006, 05:52 PM

Hi, Pagerank checksum algorithm for Python is available too
http://pagerank.gamesaga.net/

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Google Toolbar V3.x/4.x Pagerank Checksum Algorithm - compatible with PHP 4.4.x/PHP 5.x

Google Toolbar V3.x/4.x Pagerank Checksum Algorithm - compatible with PHP 4.4.x/PHP 5.x