<?php
/*
        Written and contributed by
        Alex Stapleton,
        Andy Doctorow,
        Tarakan,
        Bill Zeller,
        Vijay "Cyberax" Bhatter
        traB
    This code is released into the public domain
*/
//header("Content-Type: text/plain; charset=utf-8");
define('GOOGLE_MAGIC', 0xE6359A60);

function obtainPR($data)
{
     $ret = array();

     $parser = xml_parser_create();
     xml_parser_set_option($parser,XML_OPTION_CASE_FOLDING,0);
     xml_parser_set_option($parser,XML_OPTION_SKIP_WHITE,1);
     xml_parse_into_struct($parser,$data,$values,$tags);
     xml_parser_free($parser);

     $hash_stack = array();

     foreach ($values as $key => $val)
     {
         switch ($val['type'])
         {
           case 'complete':
               array_push($hash_stack, $val['tag']);
               $type = implode($hash_stack, "][");
               if ($type == "RK")
               {
               		$PageRank = $val[value];
               }
               array_pop($hash_stack);
           break;
         }//swhitch
     }//foreach
     
     return $PageRank;
}//obtainPR


//unsigned shift right
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);
        }
        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));
  
  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);
    /*-------------------------------------------- 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;
}


// converts an array of 32 bit integers into an array with 8 bit values. Equivalent to (BYTE *)arr32

function c32to8bit($arr32) {
    for($i=0;$i<count($arr32);$i++) {
        for ($bitOrder=$i*4;$bitOrder<=$i*4+3;$bitOrder++) {
            $arr8[$bitOrder]=$arr32[$i]&255;
            $arr32[$i]=zeroFill($arr32[$i], 8);
        }    
    }
    return $arr8;
}


// http://www.example.com/ - Checksum: 6540747202

print("<b>URL .... $url</b>n");
$url = 'info:' . $url;
$ch = GoogleCH(strord($url));
$url_to_parse = sprintf ("http://toolbarqueries.google.com/search?client=navclient-auto&ch=6%u&ie=UTF-8&oe=UTF-8&q=%s", $ch, $url);
$value = obtainPR(file_get_contents($url_to_parse));
printf("<li> <u>Checksum <2.0.114:</u> ..... 6%u ...... <A href=$url_to_parse>link</A> .... PR = $valuen",$ch);

$ch=sprintf("%u", $ch);
// new since Toolbar 2.0.114

$ch = ((($ch/7) << 2) | (((int)fmod($ch,13))&7));

$prbuf = array();
$prbuf[0] = $ch;
for($i = 1; $i < 20; $i++) {
      $prbuf[$i] = $prbuf[$i-1]-9;
}
$ch = GoogleCH(c32to8bit($prbuf), 80);
$url_to_parse = sprintf ("http://toolbarqueries.google.com/search?client=navclient-auto&ch=6%u&ie=UTF-8&oe=UTF-8&q=%s", $ch, $url);
$value = obtainPR(file_get_contents($url_to_parse));
//
printf("<li> <u>Checksum >=2.0.114:</u> ..... 6%u ...... <A href=$url_to_parse>link</A> .... PR = $valuen",$ch);

?>