191 lines
4.8 KiB
C++
191 lines
4.8 KiB
C++
/*
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* This file is part of the Owl Positioning System (OwlPS).
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* OwlPS is a project of the University of Franche-Comté
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* (Université de Franche-Comté), France.
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*/
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#include "posutil.hh"
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#include "posexcept.hh"
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#include "stock.hh"
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#include "measurement.hh"
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#include <owlps.h>
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#include <cmath>
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using namespace std ;
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using std::tr1::unordered_map ;
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/* *** Maths *** */
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double PosUtil::rad2deg(const double &radians)
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{
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return radians * (180.0 / M_PI) ;
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}
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/* *** Measurements *** */
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/**
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* APs that have not captured a Request must not have too much weight in
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* the computation. Thus, in the measurements lists we compare, we add
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* missing APs with a very low SS value.
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*
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* Both lists can be completed, depending of the APs they contain.
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* Both lists must initially contain at least one measurement.
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*/
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void PosUtil::complete_with_dummy_measurements(
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unordered_map<string, Measurement> &measurements1,
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unordered_map<string, Measurement> &measurements2)
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{
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assert(! measurements1.empty()) ;
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assert(! measurements2.empty()) ;
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Measurement dummy ;
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dummy.add_ss(-98) ; // FIXME: should be the smallest possible value
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for (unordered_map<string, Measurement>::const_iterator i =
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measurements1.begin() ; i != measurements1.end() ; ++i)
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if (measurements2.find(i->first) == measurements2.end())
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{
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dummy.set_ap(&Stock::get_ap(i->first)) ;
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measurements2[i->first] = dummy ;
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}
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for (unordered_map<string, Measurement>::const_iterator i =
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measurements2.begin() ; i != measurements2.end() ; ++i)
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if (measurements1.find(i->first) == measurements1.end())
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{
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dummy.set_ap(&Stock::get_ap(i->first)) ;
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measurements1[i->first] = dummy ;
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}
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}
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/**
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* Both lists must have the same size and contain the same keys:
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* you should call complete_with_dummy_measurements() before
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* compute_ss_square_distance().
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*/
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float PosUtil::ss_square_distance(
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unordered_map<string, Measurement> &measurements1,
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unordered_map<string, Measurement> &measurements2)
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{
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assert(measurements1.size() == measurements2.size()) ;
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float distance = 0 ;
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for (unordered_map<string, Measurement>::const_iterator i1 =
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measurements1.begin() ; i1 != measurements1.end() ; ++i1)
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{
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unordered_map<string, Measurement>::const_iterator i2 =
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measurements2.find(i1->first) ;
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assert(i2 != measurements2.end()) ;
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distance += i1->second.ss_square_distance(
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i2->second) ;
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}
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return distance ;
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}
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/* *** Wi-Fi *** */
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/**
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* @param channel A IEEE 802.11 channel or frequency in MHz or in Hz.
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* @return The frequency in Hz.
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* @throw malformed_input_data if \em channel is not a valid channel or
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* frequency value.
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*/
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unsigned long PosUtil::wifi_channel_to_hz(const unsigned long &channel)
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{
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switch (channel)
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{
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case 1:
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case OWL_80211_MHZ_CHANNEL_1:
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case OWL_80211_HZ_CHANNEL_1:
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return OWL_80211_HZ_CHANNEL_1 ;
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case 2:
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case OWL_80211_MHZ_CHANNEL_2:
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case OWL_80211_HZ_CHANNEL_2:
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return OWL_80211_HZ_CHANNEL_2 ;
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case 3:
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case OWL_80211_MHZ_CHANNEL_3:
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case OWL_80211_HZ_CHANNEL_3:
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return OWL_80211_HZ_CHANNEL_3 ;
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case 4:
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case OWL_80211_MHZ_CHANNEL_4:
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case OWL_80211_HZ_CHANNEL_4:
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return OWL_80211_HZ_CHANNEL_4 ;
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case 5:
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case OWL_80211_MHZ_CHANNEL_5:
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case OWL_80211_HZ_CHANNEL_5:
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return OWL_80211_HZ_CHANNEL_5 ;
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case 6:
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case OWL_80211_MHZ_CHANNEL_6:
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case OWL_80211_HZ_CHANNEL_6:
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return OWL_80211_HZ_CHANNEL_6 ;
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case 7:
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case OWL_80211_MHZ_CHANNEL_7:
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case OWL_80211_HZ_CHANNEL_7:
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return OWL_80211_HZ_CHANNEL_7 ;
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case 8:
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case OWL_80211_MHZ_CHANNEL_8:
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case OWL_80211_HZ_CHANNEL_8:
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return OWL_80211_HZ_CHANNEL_8 ;
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case 9:
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case OWL_80211_MHZ_CHANNEL_9:
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case OWL_80211_HZ_CHANNEL_9:
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return OWL_80211_HZ_CHANNEL_9 ;
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case 10:
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case OWL_80211_MHZ_CHANNEL_10:
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case OWL_80211_HZ_CHANNEL_10:
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return OWL_80211_HZ_CHANNEL_10 ;
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case 11:
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case OWL_80211_MHZ_CHANNEL_11:
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case OWL_80211_HZ_CHANNEL_11:
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return OWL_80211_HZ_CHANNEL_11 ;
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case 12:
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case OWL_80211_MHZ_CHANNEL_12:
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case OWL_80211_HZ_CHANNEL_12:
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return OWL_80211_HZ_CHANNEL_12 ;
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case 13:
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case OWL_80211_MHZ_CHANNEL_13:
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case OWL_80211_HZ_CHANNEL_13:
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return OWL_80211_HZ_CHANNEL_13 ;
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case 14:
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case OWL_80211_MHZ_CHANNEL_14:
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case OWL_80211_HZ_CHANNEL_14:
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return OWL_80211_HZ_CHANNEL_14 ;
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}
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// Error: wrong channel value
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throw bad_channel(channel) ;
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}
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/* *** Strings *** */
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string PosUtil::int_to_mac(const uint32_t source)
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{
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uint8_t bytes[6] ;
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memset(bytes, 0, 6) ;
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for (int i = 0 ; i < 4 ; ++i)
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bytes[i+2] = reinterpret_cast<const uint8_t*>(&source)[i] ;
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char mac_cstr[OWL_ETHER_ADDR_STRLEN] ;
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owl_mac_bytes_to_string_r(bytes, mac_cstr) ;
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string mac(mac_cstr) ;
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to_upper(mac) ;
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return mac ;
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}
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