[WIP] attempt to allow chrome OS to inject its wifi data provider

content/browser/geolocation/wifi_data_provider_win.cc

Index: content/browser/geolocation/wifi_data_provider_win.cc
diff --git a/content/browser/geolocation/wifi_data_provider_win.cc b/content/browser/geolocation/wifi_data_provider_win.cc
index 8837c2ecca4cb245cf7500aa12de5e3f55b45dde..bcd731d95d78fa208aba4e2824cdcc36c975fcb6 100644
--- a/content/browser/geolocation/wifi_data_provider_win.cc
+++ b/content/browser/geolocation/wifi_data_provider_win.cc
@@ -153,7 +153,6 @@ bool ResizeBuffer(int requested_size, scoped_ptr_malloc<BYTE>* buffer);
 bool GetSystemDirectory(string16* path);
 }  // namespace
 
-template<>
 WifiDataProviderImplBase* WifiDataProvider::DefaultFactoryFunction() {
   return new Win32WifiDataProvider();
 }
@@ -184,6 +183,47 @@ PollingPolicyInterface* Win32WifiDataProvider::NewPollingPolicy() {
 // Local classes and functions
 namespace {
 
+bool ConvertToAccessPointData(const NDIS_WLAN_BSSID& data,
+                              AccessPointData *access_point_data) {
+  // Currently we get only MAC address, signal strength and SSID.
+  // TODO(steveblock): Work out how to get age, channel and signal-to-noise.
+  DCHECK(access_point_data);
+  access_point_data->mac_address = MacAddressAsString16(data.MacAddress);
+  access_point_data->radio_signal_strength = data.Rssi;
+  // Note that _NDIS_802_11_SSID::Ssid::Ssid is not null-terminated.
+  UTF8ToUTF16(reinterpret_cast<const char*>(data.Ssid.Ssid),
+              data.Ssid.SsidLength,
+              &access_point_data->ssid);
+  return true;
+}
+
+int GetDataFromBssIdList(const NDIS_802_11_BSSID_LIST& bss_id_list,
+                         int list_size,
+                         WifiData::AccessPointDataSet* data) {
+  // Walk through the BSS IDs.
+  int found = 0;
+  const uint8 *iterator = reinterpret_cast<const uint8*>(&bss_id_list.Bssid[0]);
+  const uint8 *end_of_buffer =
+      reinterpret_cast<const uint8*>(&bss_id_list) + list_size;
+  for (int i = 0; i < static_cast<int>(bss_id_list.NumberOfItems); ++i) {
+    const NDIS_WLAN_BSSID *bss_id =
+        reinterpret_cast<const NDIS_WLAN_BSSID*>(iterator);
+    // Check that the length of this BSS ID is reasonable.
+    if (bss_id->Length < sizeof(NDIS_WLAN_BSSID) ||
+        iterator + bss_id->Length > end_of_buffer) {
+      break;
+    }
+    AccessPointData access_point_data;
+    if (ConvertToAccessPointData(*bss_id, &access_point_data)) {
+      data->insert(access_point_data);
+      ++found;
+    }
+    // Move to the next BSS ID.
+    iterator += bss_id->Length;
+  }
+  return found;
+}
+
 // WindowsWlanApi
 WindowsWlanApi::WindowsWlanApi(HINSTANCE library)
     : library_(library) {