<?php

class ip
{
	public $fp;
	public $firstip;
	public $lastip;
	public $totalip;

	public function ip($datfile = IPDATA)
	{
		$this->fp = fopen($datfile, 'rb');
		$this->firstip = $this->get4b();
		$this->lastip = $this->get4b();
		$this->totalip = ($this->lastip - $this->firstip) / 7;
		register_shutdown_function(array($this, 'closefp'));
	}

	public function closefp()
	{
		fclose($this->fp);
	}

	public function get4b()
	{
		$str = unpack('V', fread($this->fp, 4));
		return $str[1];
	}

	public function getoffset()
	{
		$str = unpack('V', fread($this->fp, 3) . chr(0));
		return $str[1];
	}

	public function getstr()
	{
		$split = fread($this->fp, 1);

		while (ord($split) != 0) {
			$str .= $split;
			$split = fread($this->fp, 1);
		}

		return $str;
	}

	public function iptoint($ip)
	{
		return pack('N', intval(ip2long($ip)));
	}

	public function readaddress()
	{
		$now_offset = ftell($this->fp);
		$flag = $this->getflag();

		switch (ord($flag)) {
		case 0:
			$address = '';
			break;

		case 1:
		case 2:
			fseek($this->fp, $this->getoffset());
			$address = $this->getstr();
			break;

		default:
			fseek($this->fp, $now_offset);
			$address = $this->getstr();
			break;
		}

		return $address;
	}

	public function getflag()
	{
		return fread($this->fp, 1);
	}

	public function searchip($ip)
	{
		$ip = gethostbyname($ip);
		$ip_offset['ip'] = $ip;
		$ip = $this->iptoint($ip);
		$firstip = 0;
		$lastip = $this->totalip;
		$ipoffset = $this->lastip;

		while ($firstip <= $lastip) {
			$i = floor(($firstip + $lastip) / 2);
			fseek($this->fp, $this->firstip + $i * 7);
			$startip = strrev(fread($this->fp, 4));

			if ($ip < $startip) {
				$lastip = $i - 1;
			}
			else {
				fseek($this->fp, $this->getoffset());
				$endip = strrev(fread($this->fp, 4));

				if ($endip < $ip) {
					$firstip = $i + 1;
				}
				else {
					$ip_offset['offset'] = $this->firstip + $i * 7;
					break;
				}
			}
		}

		return $ip_offset;
	}

	public function getaddress($ip)
	{
		$ip_offset = $this->searchip($ip);
		$ipoffset = $ip_offset['offset'];
		$address['ip'] = $ip_offset['ip'];
		fseek($this->fp, $ipoffset);
		$address['startip'] = long2ip($this->get4b());
		$address_offset = $this->getoffset();
		fseek($this->fp, $address_offset);
		$address['endip'] = long2ip($this->get4b());
		$flag = $this->getflag();

		switch (ord($flag)) {
		case 1:
			$address_offset = $this->getoffset();
			fseek($this->fp, $address_offset);
			$flag = $this->getflag();

			switch (ord($flag)) {
			case 2:
				fseek($this->fp, $this->getoffset());
				$address['area1'] = $this->getstr();
				fseek($this->fp, $address_offset + 4);
				$address['area2'] = $this->readaddress();
				break;

			default:
				fseek($this->fp, $address_offset);
				$address['area1'] = $this->getstr();
				$address['area2'] = $this->readaddress();
				break;
			}

			break;

		case 2:
			$address1_offset = $this->getoffset();
			fseek($this->fp, $address1_offset);
			$address['area1'] = $this->getstr();
			fseek($this->fp, $address_offset + 8);
			$address['area2'] = $this->readaddress();
			break;

		default:
			fseek($this->fp, $address_offset + 4);
			$address['area1'] = $this->getstr();
			$address['area2'] = $this->readaddress();
			break;
		}

		if (strpos($address['area1'], 'CZ88.NET') != false) {
			$address['area1'] = '';
		}

		if (strpos($address['area2'], 'CZ88.NET') != false) {
			$address['area2'] = '';
		}

		return $address;
	}
}

!defined('IN_MYMPS') && exit('Access Denied');
define('IPDATA', MYMPS_DATA . '/ipdat/ipdata.dat');

?>