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<?php
/**
* License Information:
*
* Net_DNS: A resolver library for PHP
* Copyright (c) 2002-2003 Eric Kilfoil eric@ypass.net
* Maintainers:
* Marco Kaiser <bate@php.net>
* Florian Anderiasch <fa@php.net>
* Ian Pye <ianbara@imap.cc>
*
* PHP versions 4 and 5
*
* LICENSE: This source file is subject to version 3.01 of the PHP license
* that is available through the world-wide-web at the following URI:
* http://www.php.net/license/3_01.txt. If you did not receive a copy of
* the PHP License and are unable to obtain it through the web, please
* send a note to license@php.net so we can mail you a copy immediately.
*
* A representation of a resource record of type <b>LOC</b>
*
* @category Networking
* @package Net_DNS
* @author Ian Pye <ianbara@imap.cc>
* @license 3.01 PHP license
* @link http://pear.php.net/package/Net_DNS
* @see http://en.wikipedia.org/wiki/LOC_record
*/
class Net_DNS_RR_LOC extends Net_DNS_RR
{
/* class variable definitions {{{ */
// Static constants
// Reference altitude in centimeters (see RFC 1876).
var $reference_alt = 10000000;
// Reference lat/lon (see RFC 1876).
var $reference_latlon = 2147483648; // pow(2, 31);
// Conversions to/from thousandths of a degree.
var $conv_sec = 1000; // 1000 milisecs.
var $conv_min = 60000; // sec * 60
var $conv_deg = 3600000; // min * 60
// Defaults (from RFC 1876, Section 3).
var $default_min = 0;
var $default_sec = 0;
var $default_size = 1;
var $default_horiz_pre = 10000;
var $default_vert_pre = 10;
var $data; // Contains packed binary data in the LOC format.
var $offset; // Offset to start reading the data.
// Variables read directs from the raw data.
var $raw_latitude;
var $raw_longitude;
var $raw_alt;
var $size;
var $hp;
var $vp;
// Variables set by parsing the raw data.
var $altitude;
var $degree_latitude;
var $degree_longitude;
var $min_latitude;
var $min_longitude;
var $sec_latitude;
var $sec_longitude;
var $ns_hem;
var $ew_hem;
// Complete string representation of the data.
var $pretty_print_string;
// Has the raw data been parsed yet?
var $parsed;
// What version of the protocol are we using?
var $version;
/* }}} */
/**
* class constructor - RR(&$rro, $data, $offset = '')
*
* Usage:
* $rr = new Net_DNS_RR_LOC($rro, $data, $offset);
* $rr->parse();
*
* @param $rro
* @param string $data String to parse
* @param int $offset
*/
function Net_DNS_RR_LOC($rro, $data, $offset = 0)
{
// Keep all of the common fields.
$this->name = $rro->name;
$this->type = $rro->type;
$this->class = $rro->class;
$this->ttl = $rro->ttl;
$this->rdlength = $rro->rdlength;
$this->rdata = $rro->rdata;
// And keep the actual data.
$this->data = $data;
$this->offset = $offset;
}
/**
* Net_DNS_RR_LOC::parse()
* Parses the $data field set in the constructor.
*/
function parse() {
if (isset($this->offset) && isset($this->data) && !($this->parsed)) {
if ($this->rdlength > 0) {
$off = $this->offset;
$a = unpack(
"@$off/Cversion/Csize/Choriz_pre/Cvert_pre/Nlat/Nlong/Nalt",
$this->data
);
$this->version = $a['version'];
$this->size = $this->precsize_ntoval($a['size']);
$this->hp = $this->precsize_ntoval($a['horiz_pre']);
$this->vp = $this->precsize_ntoval($a['vert_pre']);
// If these are all 0, use the defaults.
if (!$this->size) {
$this->size = $this->default_size;
}
if (!$this->hp) {
$this->hp = $this->default_horiz_pre;
}
if (!$this->vp) {
$this->vp = $this->default_vert_pre;
}
$this->raw_latitude = $a['lat'];
$this->raw_longitude = $a['long'];
$this->raw_alt = $a['alt'];
$this->altitude = ($this->raw_alt - $this->reference_alt) / 100;
$this->pretty_print_string =
$this->latlon2dms($this->raw_latitude, "NS", true) . ' ' .
$this->latlon2dms($this->raw_longitude, "EW", false) . ' ' .
$this->altitude . 'm ' .
$this->size . 'm ' .
$this->hp . 'm ' .
$this->vp . 'm';
$this->parsed = true;
}
}
}
/**
* @return string
*/
function rdatastr()
{
if (!$this->parsed) {
$this->parse_data();
}
if ($this->pretty_print_string) {
return $this->pretty_print_string;
}
return '; no data';
}
/**
* @param $packet
* @param $offset
*
* @return string
*/
function rr_rdata($packet, $offset)
{
if (!$this->parsed) {
$this->parse_data();
}
$rdata = "";
if (isset($this->version)) {
$rdata .= pack("C", $this->version);
if ($this->version == 0) {
$rdata .= pack(
"C3", $this->precsize_valton($this->size),
$this->precsize_valton($this->hp),
$this->precsize_valton($this->vp)
);
$rdata .= pack(
"N3",
$this->raw_latitude,
$this->raw_longitude,
$this->raw_alt
);
} else {
// We don't know how to handle other versions.
}
}
return $rdata;
}
/**
* @param $prec
* @return int
*/
function precsize_ntoval($prec)
{
$mantissa = (($prec >> 4) & 0x0f) % 10;
$exponent = ($prec & 0x0f) % 10;
return $mantissa * $poweroften[$exponent];
}
/**
* @param int $val
* @return int
*/
function precsize_valton($val)
{
$exponent = 0;
while ($val >= 10) {
$val /= 10;
++$exponent;
}
return (intval($val) << 4) | ($exponent & 0x0f);
}
/**
* Now with added side effects, setting values for the class,
* while returning a formatted string.
* Net_DNS_RR_LOC::latlon2dms($rawmsec, $hems, $is_lat) {{{
*
* @todo This should not change class state
*
* @param $rawmsec
* @param $hems
* @param bool $is_lat
*/
function latlon2dms($rawmsec, $hems, $is_lat = false)
{
// Adjust for hemisphere problems (E and N can have negative values,
// which need to be corrected for).
$flipped = false;
if ($rawmsec < 0) {
$rawmsec = -1 * $rawmsec;
$flipped = true;
}
$abs = abs($rawmsec - $this->reference_latlon);
$deg = intval($abs / $this->conv_deg);
$abs -= $deg * $this->conv_deg;
$min = intval($abs / $this->conv_min);
$abs -= $min * $this->conv_min;
$sec = intval($abs / $this->conv_sec);
$abs -= $sec * $this->conv_sec;
$msec = $abs;
$hem = substr($hems, (($rawmsec >= $this->reference_latlon) ? 0 : 1), 1);
if ($flipped) {
$hem = substr($hems, (($rawmsec >= $this->reference_latlon) ? 1 : 0), 1);
}
// Save the results.
if ($is_lat) {
$this->degree_latitude = $deg;
$this->min_latitude = $min;
$this->sec_latitude = $sec;
$this->ns_hem = $hem;
} else {
$this->degree_longitude = $deg;
$this->min_longitude = $min;
$this->sec_longitude = $sec;
$this->ew_hem = $hem;
}
return sprintf("%d %02d %02d.%03d %s", $deg, $min, $sec, $msec, $hem);
}
}
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