feyd | Please use
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hi @ all
Based on the checksum-algorythm i wrote an own class to calculate the pagerank.
It worked fine and gived me what i wanted. But as soon i uploaded the class to my webserver, the checksum of the same page was changed.
So i searched first for errors in my class. But after i don't found any errors, i tried different classes and functions to get the pagerank and all the tried things fail on the server. (still i get a wrong checksum)
The used php-version is 4.4.2-1 (Debian) and 5.1 (debian - cgi).
Now i searched for errors and found following differences between the online / offline version:
function mix second call for zerofill:
$c -= $a; $c -= $b; $c ^= (zeroFill($b,13));
Offline i get: 315672
Online: 257898
From now all other things have to go wrong...
The function mix called in GoogleCH() inside a while. And there is the place where the second call of mix() give a wrong number back.
Anyone an idea why this happens and why only online with php 4.4.2-1 and not with 4.3.11 ?
(here the complete function without many changes)Code: Select all
define('GOOGLE_MAGIC', 0xE6359A60);
//unsigned shift right
if (isset($_POST['send'])):
function zeroFill($a, $b)
{
$z = hexdec(80000000);
if ($z & $a)
{
$a = ($a>>1);
$a &= (~$z);
$a |= 0x40000000;
$a = ($a>>($b-1));
}
else
{
$a = ($a>>$b);
}
echo '<pre>1:<br />';
print_r($a);
echo '</pre>';
return $a;
}
function mix($a,$b,$c) {
$a -= $b; $a -= $c; $a ^= (zeroFill($c,13));
$b -= $c; $b -= $a; $b ^= ($a<<8);
$c -= $a; $c -= $b; $c ^= (zeroFill($b,13));
$a -= $b; $a -= $c; $a ^= (zeroFill($c,12));
$b -= $c; $b -= $a; $b ^= ($a<<16);
$c -= $a; $c -= $b; $c ^= (zeroFill($b,5));
$a -= $b; $a -= $c; $a ^= (zeroFill($c,3));
$b -= $c; $b -= $a; $b ^= ($a<<10);
$c -= $a; $c -= $b; $c ^= (zeroFill($b,15));
echo '<pre>2:<br />';
print_r($a);
echo '</pre>';
echo '<pre>3:<br />';
print_r($b);
echo '</pre>';
echo '<pre>4:<br />';
print_r($c);
echo '</pre>';
return array($a,$b,$c);
}
function GoogleCH($url, $length=null, $init=GOOGLE_MAGIC) {
if(is_null($length)) {
$length = sizeof($url);
}
$a = $b = 0x9E3779B9;
$c = $init;
$k = 0;
$len = $length;
while($len >= 12) {
$a += ($url[$k+0] +($url[$k+1]<<8) +($url[$k+2]<<16) +($url[$k+3]<<24));
$b += ($url[$k+4] +($url[$k+5]<<8) +($url[$k+6]<<16) +($url[$k+7]<<24));
$c += ($url[$k+8] +($url[$k+9]<<8) +($url[$k+10]<<16)+($url[$k+11]<<24));
$mix = mix($a,$b,$c);
$a = $mix[0]; $b = $mix[1]; $c = $mix[2];
$k += 12;
$len -= 12;
}
$c += $length;
switch($len) /* all the case statements fall through */
{
case 11: $c+=($url[$k+10]<<24);
case 10: $c+=($url[$k+9]<<16);
case 9 : $c+=($url[$k+8]<<8);
/* the first byte of c is reserved for the length */
case 8 : $b+=($url[$k+7]<<24);
case 7 : $b+=($url[$k+6]<<16);
case 6 : $b+=($url[$k+5]<<8);
case 5 : $b+=($url[$k+4]);
case 4 : $a+=($url[$k+3]<<24);
case 3 : $a+=($url[$k+2]<<16);
case 2 : $a+=($url[$k+1]<<8);
case 1 : $a+=($url[$k+0]);
/* case 0: nothing left to add */
}
$mix = mix($a,$b,$c);
echo '<pre>5:<br />';
print_r($mix);
echo '</pre>';
/*-------------------------------------------- report the result */
return $mix[2];
}
//converts a string into an array of integers containing the numeric value of the char
function strord($string) {
for($i=0;$i<strlen($string);$i++) {
$result[$i] = ord($string{$i});
}
return $result;
}
$url = 'info:' . addslashes($_POST['url']);
$ch = GoogleCH(strord($url));
printf("ch:\t6%u\n",$ch);feyd | Please use
Code: Select all
andCode: Select all
tags where appropriate when posting code. Read: [url=http://forums.devnetwork.net/viewtopic.php?t=21171]Posting Code in the Forums[/url][/color]