<?
/* Storeip -storeip.php-

NOTICE1: Don't use this class with MYSQL >=2.23
use inet_aton() and inet_ntoa() instead.
See: php_and_mysql.txt

There are network addresses types in PostgreSQL too.
See: http://developer.postgresql.org/docs/postgres/datatype-net-types.html

NOTICE2: Don't use this class with PHP >=4.0
use long2ip() and ip2long() instead.
See: php_and_mysql.txt

 To Store ip-addresses in a database, you will
 need a field type of Char(15).
 This class let's you store the ipnumbers as
 an integer ( between -2139062144 and 2139062143)

 This class has two functions
 1) decode ip->number
 2) encode number->ip

 Both functions return false for empty or wrong ip-numbers

 While using this class you will spare typical 11 bytes
 for every ipnumber you store.
 Char(15) needs 15 Bytes
 SIGNED INT(10) needs 4 Bytes

   Version 0.1a
   Last change: 2002/09/22
   copyrigth 2002 Email Communications, http://www.emailcommunications.nl/
   written by Bas Jobsen (hide@address.com)

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2, or (at your option)
   any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software Foundation,
   Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/

class storeip
{
 function decode(&$ip)
 {
 $partjes=explode('.',$ip);
 $ip=0;
 if(count($partjes)!=4) {$ip=false; return;}
 for($x=0; $x<4; $x++)
 {
 if(!is_numeric($partjes[$x])||$partjes[$x]>255 || $partjes[$x]<0) {$ip=false; return;}
 $ip+=$partjes[$x] << ($x*8);
 }
 }


 function encode(&$decode_ip)
 {
 if(!is_numeric($decode_ip)){$decode_ip=false; return;}
 $ip_string='';
 for($i=0; $i<4; $i++)
 {
	if($i>0)$ip_string.='.';
	$c=($decode_ip & (255 << ($i*8))) >> ($i*8);
	if($c<0)$c+=256;
	if($c<0 || $c>255){$decode_ip=false; return;}
	$ip_string.=$c;
 }
 $decode_ip=$ip_string;
 } 

 function get_decoded($ip)
 {
  $this->decode($ip);
  return $ip;
 }

 function get_encoded($ip)
 {
  $this->encode($ip);
  return $ip;
 }


}
?>