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<?php

/* geoipcity.inc
 *
 * Copyright (C) 2013 MaxMind, Inc.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307    USA
 */

define("FULL_RECORD_LENGTH", 50);

require_once 'geoip.inc';
require_once 'geoipregionvars.php';

class geoiprecord
{
    public $country_code;
    public $country_code3;
    public $country_name;
    public $region;
    public $city;
    public $postal_code;
    public $latitude;
    public $longitude;
    public $area_code;
    public $dma_code; # metro and dma code are the same. use metro_code
    public $metro_code;
    public $continent_code;
}

function _get_record_v6($gi, $ipnum)
{
    $seek_country = _geoip_seek_country_v6($gi, $ipnum);
    if ($seek_country == $gi->databaseSegments) {
        return null;
    }
    return _common_get_record($gi, $seek_country);
}

function _common_get_record($gi, $seek_country)
{
    // workaround php's broken substr, strpos, etc handling with
    // mbstring.func_overload and mbstring.internal_encoding
    $mbExists = extension_loaded('mbstring');
    if ($mbExists) {
        $enc = mb_internal_encoding();
        mb_internal_encoding('ISO-8859-1');
    }

$record_pointer = $seek_country + (2 * $gi->record_length - 1) * $gi->databaseSegments;

if ($gi->flags & GEOIP_MEMORY_CACHE) {
        $record_buf = substr($gi->memory_buffer, $record_pointer, FULL_RECORD_LENGTH);
    } elseif ($gi->flags & GEOIP_SHARED_MEMORY) {
        $record_buf = _sharedMemRead($gi, $record_pointer, FULL_RECORD_LENGTH);
    } else {
        fseek($gi->filehandle, $record_pointer, SEEK_SET);
        $record_buf = fread($gi->filehandle, FULL_RECORD_LENGTH);
    }
    $record = new geoiprecord;
    $record_buf_pos = 0;
    $char = ord(substr($record_buf, $record_buf_pos, 1));
    $record->country_code = $gi->GEOIP_COUNTRY_CODES[$char];
    $record->country_code3 = $gi->GEOIP_COUNTRY_CODES3[$char];
    $record->country_name = $gi->GEOIP_COUNTRY_NAMES[$char];
    $record->continent_code = $gi->GEOIP_CONTINENT_CODES[$char];
    $record_buf_pos++;
    $str_length = 0;

// Get region
    $char = ord(substr($record_buf, $record_buf_pos + $str_length, 1));
    while ($char != 0) {
        $str_length++;
        $char = ord(substr($record_buf, $record_buf_pos + $str_length, 1));
    }
    if ($str_length > 0) {
        $record->region = substr($record_buf, $record_buf_pos, $str_length);
    }
    $record_buf_pos += $str_length + 1;
    $str_length = 0;
    // Get city
    $char = ord(substr($record_buf, $record_buf_pos + $str_length, 1));
    while ($char != 0) {
        $str_length++;
        $char = ord(substr($record_buf, $record_buf_pos + $str_length, 1));
    }
    if ($str_length > 0) {
        $record->city = substr($record_buf, $record_buf_pos, $str_length);
    }
    $record_buf_pos += $str_length + 1;
    $str_length = 0;
    // Get postal code
    $char = ord(substr($record_buf, $record_buf_pos + $str_length, 1));
    while ($char != 0) {
        $str_length++;
        $char = ord(substr($record_buf, $record_buf_pos + $str_length, 1));
    }
    if ($str_length > 0) {
        $record->postal_code = substr($record_buf, $record_buf_pos, $str_length);
    }
    $record_buf_pos += $str_length + 1;

// Get latitude and longitude
    $latitude = 0;
    $longitude = 0;
    for ($j = 0; $j < 3; ++$j) {
        $char = ord(substr($record_buf, $record_buf_pos++, 1));
        $latitude += ($char << ($j * 8));
    }
    $record->latitude = ($latitude / 10000) - 180;
    for ($j = 0; $j < 3; ++$j) {
        $char = ord(substr($record_buf, $record_buf_pos++, 1));
        $longitude += ($char << ($j * 8));
    }
    $record->longitude = ($longitude / 10000) - 180;
    if (GEOIP_CITY_EDITION_REV1 == $gi->databaseType) {
        $metroarea_combo = 0;
        if ($record->country_code == "US") {
            for ($j = 0; $j < 3; ++$j) {
                $char = ord(substr($record_buf, $record_buf_pos++, 1));
                $metroarea_combo += ($char << ($j * 8));
            }
            $record->metro_code = $record->dma_code = floor($metroarea_combo / 1000);
            $record->area_code = $metroarea_combo % 1000;
        }
    }
    if ($mbExists) {
        mb_internal_encoding($enc);
    }
    return $record;
}

function GeoIP_record_by_addr_v6($gi, $addr)
{
    if ($addr == null) {
        return 0;
    }
    $ipnum = inet_pton($addr);
    return _get_record_v6($gi, $ipnum);
}

function _get_record($gi, $ipnum)
{
    $seek_country = _geoip_seek_country($gi, $ipnum);
    if ($seek_country == $gi->databaseSegments) {
        return null;
    }
    return _common_get_record($gi, $seek_country);
}

function GeoIP_record_by_addr($gi, $addr)
{
    if ($addr == null) {
        return 0;
    }
    $ipnum = ip2long($addr);
    return _get_record($gi, $ipnum);
}

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