Google PageRank Checksum Algorithm - Page 5

doctorow · 06-27-2004, 07:23 AM

alex it shouldn't matter that we are working with "minus" numbers... it is simply another way of interpreting the left-most bit. The only problem we had in php was the rightshift operator, which filled empty spaces with 1's if the number was negative. That we fixed with the zerofill() function.

When we have the final result in $eax, we can use a simple function like printf() to convert it to an unsigned integer.

alexstapleton · 06-27-2004, 07:23 AM

Thanks loads for the C code. I should be finished in 10-20 minutes at most, although I may have to add fixes for unsigned integers again.

alexstapleton · 06-27-2004, 07:36 AM

Ok. Getting minus values still. Any suggestions? Code is availible here
http://meese.ath.cx/google/googlecheck3.php

alexstapleton · 06-27-2004, 07:40 AM

my aim username is 'alex w stapleton' without the speach marks of course.

alexstapleton · 06-27-2004, 07:45 AM

Im getting minus values. And their binary equivilents are wrong! Hence it doesnt work. Someone please examine my source.

doctorow · 06-27-2004, 07:52 AM

Try it with adding

sprintf("%u",$ch);

at the end!

Unregistered · 06-27-2004, 07:53 AM

Two comments:
1) The "initval" (or "level"-value) in the Jenkins hash-algorithm is probably not the GOOGLE_MAGIC-value since initval is supposed to by a 4-byte number.
2) The "info:" of the URL-string should probably not be url-encoded (that is, the :-sign shall not be replaced with %3A).

cyberax · 06-27-2004, 07:59 AM

Hi Alex / Doctorow ... how is it going ?

Lets do it guys.. then we will try to do something about Yahoo WebRank

alexstapleton · 06-27-2004, 08:03 AM

0xE6359A60 is what the ASM code uses. (the magic value)

i fixed the info: thing

still gives wrong result with printf

alexstapleton · 06-27-2004, 08:14 AM

im gunna run a debugger over the C code to check where the values are different between versions

doctorow · 06-27-2004, 08:16 AM

alex: I cannot debug your code before tonight... will download the most current one and check it out later.

cyberax: didn't even know that yahoo had something similar

alexstapleton · 06-27-2004, 08:21 AM

After the while loop:

Code:

PHP: $c = 671391756
   C: c = 3884531380

spot the difference?

cyberax · 06-27-2004, 08:24 AM

In my opinion we need the Hash of "info%3Awww%2Eexample%2Ecom"

alexstapleton · 06-27-2004, 08:25 AM

WHOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OO
i've done it! the urlencoded() string should NOT be sent to the hash function. silly me. time for code cleanup then release.

cyberax · 06-27-2004, 08:25 AM

url: info:http://www.example.com/

540747202
00100000001110110010010111000010

should be
540747202
00100000001110110010010111000010

Did you make it ?

06-27-2004, 08:21 AM	#72
alexstapleton Enthusiast Posts: 49 Karma: 123 Join Date: Jun 2004	After the while loop: Code: PHP: $c = 671391756 C: c = 3884531380 spot the difference?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Seriously thoughtful Dekker's Algorithm help.	Catire	Lounge	13	03-19-2010 10:03 AM
Bulk Pagerank Checker Script?	SNaRe	Lounge	2	10-22-2006 04:36 PM
Google Toolbar Pagerank Checksum Revealed!	Alexander Turcic	Lounge	5	02-17-2006 08:09 AM
Google Checksum CH calculator	cyberax	Lounge	2	08-17-2004 09:37 PM

06-27-2004, 07:23 AM	#61
doctorow Guru Posts: 914 Karma: 3410461 Join Date: May 2004 Device: Kindle Touch	alex it shouldn't matter that we are working with "minus" numbers... it is simply another way of interpreting the left-most bit. The only problem we had in php was the rightshift operator, which filled empty spaces with 1's if the number was negative. That we fixed with the zerofill() function. When we have the final result in $eax, we can use a simple function like printf() to convert it to an unsigned integer.

06-27-2004, 07:36 AM	#63
alexstapleton Enthusiast Posts: 49 Karma: 123 Join Date: Jun 2004	Ok. Getting minus values still. Any suggestions? Code is availible here http://meese.ath.cx/google/googlecheck3.php

06-27-2004, 07:40 AM	#64
alexstapleton Enthusiast Posts: 49 Karma: 123 Join Date: Jun 2004	my aim username is 'alex w stapleton' without the speach marks of course.

06-27-2004, 07:45 AM	#65
alexstapleton Enthusiast Posts: 49 Karma: 123 Join Date: Jun 2004	Im getting minus values. And their binary equivilents are wrong! Hence it doesnt work. Someone please examine my source.

06-27-2004, 07:52 AM	#66
doctorow Guru Posts: 914 Karma: 3410461 Join Date: May 2004 Device: Kindle Touch	Try it with adding sprintf("%u",$ch); at the end!

06-27-2004, 07:53 AM	#67
Unregistered Nameless Being	Two comments: 1) The "initval" (or "level"-value) in the Jenkins hash-algorithm is probably not the GOOGLE_MAGIC-value since initval is supposed to by a 4-byte number. 2) The "info:" of the URL-string should probably not be url-encoded (that is, the :-sign shall not be replaced with %3A).

06-27-2004, 07:59 AM	#68
cyberax Member Posts: 22 Karma: 87 Join Date: Jun 2004 Location: India	Hi Alex / Doctorow ... how is it going ? Lets do it guys.. then we will try to do something about Yahoo WebRank

06-27-2004, 08:03 AM	#69
alexstapleton Enthusiast Posts: 49 Karma: 123 Join Date: Jun 2004	0xE6359A60 is what the ASM code uses. (the magic value) i fixed the info: thing still gives wrong result with printf

06-27-2004, 08:14 AM	#70
alexstapleton Enthusiast Posts: 49 Karma: 123 Join Date: Jun 2004	im gunna run a debugger over the C code to check where the values are different between versions

06-27-2004, 08:16 AM	#71
doctorow Guru Posts: 914 Karma: 3410461 Join Date: May 2004 Device: Kindle Touch	alex: I cannot debug your code before tonight... will download the most current one and check it out later. cyberax: didn't even know that yahoo had something similar

Advert

Advert

06-27-2004, 08:24 AM	#73
cyberax Member Posts: 22 Karma: 87 Join Date: Jun 2004 Location: India	In my opinion we need the Hash of "info%3Awww%2Eexample%2Ecom"

06-27-2004, 08:25 AM	#74
alexstapleton Enthusiast Posts: 49 Karma: 123 Join Date: Jun 2004	WHOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOOO OO i've done it! the urlencoded() string should NOT be sent to the hash function. silly me. time for code cleanup then release.