Google PR查询接口checksum新算法

// url get method macro.
define('G_PR_GET_TYPE_FILE',1); // use fopen() function
define('G_PR_GET_TYPE_SOCKET',2); // use standard fsocketopen function
// main function to be called
function getPR($_url,$gettype=G_PR_GET_TYPE_SOCKET){
$url = 'info:'.$_url;
$ch = GCH(strord($url));
$ch = NewGCH($ch);
$url=str_replace("_","%5F",'info:'.urlencode($_url));
$googlePRUrl =
"http://toolbarqueries.google.com/search?client=navclient-auto&ch=6"
.$ch."&ie=UTF-8&oe=UTF-8&features=Rank&q=".$url;
$pr_str = retrieveURLContent($googlePRUrl,$gettype);
return substr($pr_str,strrpos($pr_str,":")+1);
}
//unsigned shift right
function zeroFill($a,$b){
$z = hexdec('8'.implode('',array_fill(0,PHP_INT_SIZE*2-1,'0')));
if ($z & $a){
$a = ($a>>1);
$a &= (~$z);
$a |= hexdec('4'.implode('','0')));
$a = ($a>>($b-1));
}
else{
$a = ($a>>$b);
}
return $a;
}
// discard bits beyonds 32 bit.
function trunkbitForce32bit($n){
if(PHP_INT_SIZE <= 4){
settype($n,'float');
if ( $n < 0 ) $n += 4294967296;
return $n;
}
else{
$clearbit = '';
for($i=0;$i$clearbit .= '00';
}
for($i=0;$i<4;$i++){
$clearbit .= 'ff';
}
return ($n & hexdec($clearbit));
}
}
function bigxor($m,$n){
//if(function_exists('gmp_init')){
// return floatval(gmp_strval(gmp_xor($m,$n)));
//}
//else{
return $m ^ $n;
//}
}
function mix($a,$b,$c){
$a = trunkbitForce32bit($a);
$b = trunkbitForce32bit($b);
$c = trunkbitForce32bit($c);
$a -= $b; $a = trunkbitForce32bit($a);
$a -= $c; $a = trunkbitForce32bit($a);
$a = bigxor($a,(zeroFill($c,13))); $a = trunkbitForce32bit($a);
$b -= $c; $b = trunkbitForce32bit($b);
$b -= $a; $b = trunkbitForce32bit($b);
$b = bigxor($b,trunkbitForce32bit($a<<8)); $b = trunkbitForce32bit($b);
$c -= $a; $c = trunkbitForce32bit($c);
$c -= $b; $c = trunkbitForce32bit($c);
$c = bigxor($c,(zeroFill($b,13))); $c = trunkbitForce32bit($c);
$a -= $b;$a = trunkbitForce32bit($a);
$a -= $c;$a = trunkbitForce32bit($a);
$a = bigxor($a,12)));$a = trunkbitForce32bit($a);
$b -= $c;$b = trunkbitForce32bit($b);
$b -= $a;$b = trunkbitForce32bit($b);
$b = bigxor($b,trunkbitForce32bit($a<<16));
$c -= $a; $c = trunkbitForce32bit($c);
$c -= $b; $c = trunkbitForce32bit($c);
$c = bigxor($c,5))); $c = trunkbitForce32bit($c);
$a -= $b;$a = trunkbitForce32bit($a);
$a -= $c;$a = trunkbitForce32bit($a);
$a = bigxor($a,3)));$a = trunkbitForce32bit($a);
$b -= $c;$b = trunkbitForce32bit($b);
$b -= $a;$b = trunkbitForce32bit($b);
$b = bigxor($b,trunkbitForce32bit($a<<10));
$c -= $a; $c = trunkbitForce32bit($c);
$c -= $b; $c = trunkbitForce32bit($c);
$c = bigxor($c,15))); $c = trunkbitForce32bit($c);
return array($a,$c);
}
function NewGCH($ch){
$ch = ( trunkbitForce32bit( ( $ch / 7 ) << 2 ) |
( ( myfmod( $ch,13 ) ) & 7 ) );
$prbuf = array();
$prbuf[0] = $ch;
for( $i = 1; $i < 20; $i++ )
{
$prbuf[$i] = $prbuf[$i-1] - 9;
}
$ch = GCH( c32to8bit( $prbuf ) );
return $ch;
}
function myfmod($x,$y){
$i = floor( $x / $y );
return ( $x - $i * $y );
}
function c32to8bit($arr32){
$arr8 = array();
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 $arr8;
}
function GCH($url,$length=null){
if(is_null($length)) {
$length = sizeof($url);
}
$init = 0xE6359A60;
$a = 0x9E3779B9;
$b = 0x9E3779B9;
$c = 0xE6359A60;
$k = 0;
$len = $length;
$mixo = array();
while( $len >= 12 ){
$a += ($url[$k+0] +trunkbitForce32bit($url[$k+1]<<8)
+trunkbitForce32bit($url[$k+2]<<16)
+trunkbitForce32bit($url[$k+3]<<24));
$b += ($url[$k+4] +trunkbitForce32bit($url[$k+5]<<8)
+trunkbitForce32bit($url[$k+6]<<16)
+trunkbitForce32bit($url[$k+7]<<24));
$c += ($url[$k+8] +trunkbitForce32bit($url[$k+9]<<8)
+trunkbitForce32bit($url[$k+10]<<16)
+trunkbitForce32bit($url[$k+11]<<24));
$mixo = mix($a,$c);
$a = $mixo[0]; $b = $mixo[1]; $c = $mixo[2];
$k += 12;
$len -= 12;
}
$c += $length;
switch( $len ) {
case 11:
$c += trunkbitForce32bit($url[$k+10]<<24);
case 10:
$c+=trunkbitForce32bit($url[$k+9]<<16);
case 9 :
$c+=trunkbitForce32bit($url[$k+8]<<8);
case 8 :
$b+=trunkbitForce32bit($url[$k+7]<<24);
case 7 :
$b+=trunkbitForce32bit($url[$k+6]<<16);
case 6 :
$b+=trunkbitForce32bit($url[$k+5]<<8);
case 5 :
$b+=trunkbitForce32bit($url[$k+4]);
case 4 :
$a+=trunkbitForce32bit($url[$k+3]<<24);
case 3 :
$a+=trunkbitForce32bit($url[$k+2]<<16);
case 2 :
$a+=trunkbitForce32bit($url[$k+1]<<8);
case 1 :
$a+=trunkbitForce32bit($url[$k+0]);
}
$mixo = mix( $a,$c );
$mixo[2] = trunkbitForce32bit($mixo[2]);
if( $mixo[2] < 0 ){
return (
hexdec('1'.
implode('',
array_fill(0,PHP_INT_SIZE*2,'0')))
+ $mixo[2] );
}
else{
return $mixo[2];
}
}
// converts a string into an array of integers
// containing the numeric value of the char
function strord($string){
for($i=0;$i$result[$i] = ord($string{$i});
}
return $result;
}
// return url page content or false if failed.
function retrieveURLContent($url,$gettype){
switch($gettype){
case G_PR_GET_TYPE_FILE:
return retrieveURLContentByFile($url);
break;
default:
return retrieveURLContentBySocket($url);
break;
}
}
function retrieveURLContentByFile($url){
$fd = @fopen($url,"r");
if(!$fd){
return false;
}
$result = "";
while($buffer = fgets($fd,4096)) {
$result .= $buffer;
}
fclose($fd);
return $result;
}
function retrieveURLContentBySocket($url,
$host="",
$port=80,
$timeout=30){
if($host == ""){
if(!($pos = strpos($url,'://'))){
return false;
}
$host = substr( $url,
$pos+3,
strpos($url,'/',$pos+3) - $pos - 3);
$uri = substr($url,strpos($url,$pos+3));
}
else{
$uri = $url;
}
$request = "GET ".$uri." HTTP/1.0rn"
."Host: ".$host."rn"
."Accept: */*rn"
."User-Agent: ZealGetrn"
."rn";
$sHnd = @fsockopen ($host,$port,$errno,$errstr,$timeout);
if(!$sHnd){
return false;
}
@fputs ($sHnd,$request);
// Get source
$result = "";
while (!feof($sHnd)){
$result .= fgets($sHnd,4096);
}
fclose($sHnd);
$headerend = strpos($result,"rnrn");
if (is_bool($headerend))
{
return $result;
}
else{
return substr($result,$headerend+4);
}
}