dom/geolocation/nsGeoPositionIPCSerialiser.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #ifndef dom_src_geolocation_IPC_serialiser
   8 #define dom_src_geolocation_IPC_serialiser
   9
  10 #include "ipc/IPCMessageUtils.h"
  11 #include "mozilla/dom/GeolocationPosition.h"
  12 #include "nsIDOMGeoPosition.h"
  13
  14 namespace IPC {
  15
  16 template <>
  17 struct ParamTraits<nsIDOMGeoPositionCoords*> {
  18   // Function to serialize a geoposition
  19   static void Write(MessageWriter* aWriter, nsIDOMGeoPositionCoords* aParam) {
  20     bool isNull = !aParam;
  21     WriteParam(aWriter, isNull);
  22     // If it is a null object, then we are done
  23     if (isNull) return;
  24
  25     double coordData;
  26
  27     aParam->GetLatitude(&coordData);
  28     WriteParam(aWriter, coordData);
  29
  30     aParam->GetLongitude(&coordData);
  31     WriteParam(aWriter, coordData);
  32
  33     aParam->GetAltitude(&coordData);
  34     WriteParam(aWriter, coordData);
  35
  36     aParam->GetAccuracy(&coordData);
  37     WriteParam(aWriter, coordData);
  38
  39     aParam->GetAltitudeAccuracy(&coordData);
  40     WriteParam(aWriter, coordData);
  41
  42     aParam->GetHeading(&coordData);
  43     WriteParam(aWriter, coordData);
  44
  45     aParam->GetSpeed(&coordData);
  46     WriteParam(aWriter, coordData);
  47   }
  48
  49   // Function to de-serialize a geoposition
  50   static bool Read(MessageReader* aReader,
  51                    RefPtr<nsIDOMGeoPositionCoords>* aResult) {
  52     // Check if it is the null pointer we have transfered
  53     bool isNull;
  54     if (!ReadParam(aReader, &isNull)) return false;
  55
  56     if (isNull) {
  57       *aResult = nullptr;
  58       return true;
  59     }
  60
  61     double latitude;
  62     double longitude;
  63     double altitude;
  64     double accuracy;
  65     double altitudeAccuracy;
  66     double heading;
  67     double speed;
  68
  69     // It's not important to us where it fails, but rather if it fails
  70     if (!(ReadParam(aReader, &latitude) && ReadParam(aReader, &longitude) &&
  71           ReadParam(aReader, &altitude) && ReadParam(aReader, &accuracy) &&
  72           ReadParam(aReader, &altitudeAccuracy) &&
  73           ReadParam(aReader, &heading) && ReadParam(aReader, &speed)))
  74       return false;
  75
  76     // We now have all the data
  77     *aResult = new nsGeoPositionCoords(latitude,         /* aLat     */
  78                                        longitude,        /* aLong    */
  79                                        altitude,         /* aAlt     */
  80                                        accuracy,         /* aHError  */
  81                                        altitudeAccuracy, /* aVError  */
  82                                        heading,          /* aHeading */
  83                                        speed             /* aSpeed   */
  84     );
  85     return true;
  86   }
  87 };
  88
  89 template <>
  90 struct ParamTraits<nsIDOMGeoPosition*> {
  91   // Function to serialize a geoposition
  92   static void Write(MessageWriter* aWriter, nsIDOMGeoPosition* aParam) {
  93     bool isNull = !aParam;
  94     WriteParam(aWriter, isNull);
  95     // If it is a null object, then we are done
  96     if (isNull) return;
  97
  98     EpochTimeStamp timeStamp;
  99     aParam->GetTimestamp(&timeStamp);
 100     WriteParam(aWriter, timeStamp);
 101
 102     nsCOMPtr<nsIDOMGeoPositionCoords> coords;
 103     aParam->GetCoords(getter_AddRefs(coords));
 104     WriteParam(aWriter, coords);
 105   }
 106
 107   // Function to de-serialize a geoposition
 108   static bool Read(MessageReader* aReader, RefPtr<nsIDOMGeoPosition>* aResult) {
 109     // Check if it is the null pointer we have transfered
 110     bool isNull;
 111     if (!ReadParam(aReader, &isNull)) return false;
 112
 113     if (isNull) {
 114       *aResult = nullptr;
 115       return true;
 116     }
 117
 118     EpochTimeStamp timeStamp;
 119     RefPtr<nsIDOMGeoPositionCoords> coords;
 120
 121     // It's not important to us where it fails, but rather if it fails
 122     if (!ReadParam(aReader, &timeStamp) || !ReadParam(aReader, &coords)) {
 123       return false;
 124     }
 125
 126     *aResult = new nsGeoPosition(coords, timeStamp);
 127
 128     return true;
 129   };
 130 };
 131
 132 }  // namespace IPC
 133
 134 #endif