Port the gears geolocation network provider to Chromium...

chrome/browser/geolocation/geoposition.cc

+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "chrome/browser/geolocation/geoposition.h"
+
+namespace {
+// Sentinel values to mark invalid data. (WebKit carries companion is_valid
+// bools for this purpose; we may eventually follow that approach, but
+// sentinels worked OK in the gears code this is based on.)
+const double kBadLatLng = 200;
+// Lowest point on land is at approximately -400 metres.
+const int kBadAltitude = -1000;
+const int kBadAccuracy = -1;  // Accuracy must be non-negative.
+const int64 kBadTimestamp = kint64min;
+}
+
+Position::Position()
+    : latitude(kBadLatLng),
+      longitude(kBadLatLng),
+      altitude(kBadAltitude),
+      accuracy(kBadAccuracy),
+      altitude_accuracy(kBadAccuracy),
+      timestamp(kBadTimestamp),
+      error_code(ERROR_CODE_NONE) {
+}
+
+bool Position::is_valid_latlong() const {
+  return latitude >= -90.0 && latitude <= 90.0 &&
+         longitude >= -180.0 && longitude <= 180.0;
+}
+
+bool Position::is_valid_altitude() const {
+  return altitude > kBadAltitude;
+}
+
+bool Position::is_valid_accuracy() const {
+  return accuracy >= 0.0;
+}
+
+bool Position::is_valid_altitude_accuracy() const {
+  return altitude_accuracy >= 0.0;
+}
+
+bool Position::is_valid_timestamp() const {
+  return timestamp != kBadTimestamp;
+}
+
+bool Position::IsValidFix() const {
+  return is_valid_latlong() && is_valid_accuracy() && is_valid_timestamp();
+}
+
+bool Position::IsInitialized() const {
+  return error_code != ERROR_CODE_NONE || IsValidFix();
+}