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

content/browser/geolocation/wifi_data_provider_win.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.
 
 // Windows Vista uses the Native Wifi (WLAN) API for accessing WiFi cards. See
 // http://msdn.microsoft.com/en-us/library/ms705945(VS.85).aspx. Windows XP
 // Service Pack 3 (and Windows XP Service Pack 2, if upgraded with a hot fix)
 // also support a limited version of the WLAN API. See
 // http://msdn.microsoft.com/en-us/library/bb204766.aspx. The WLAN API uses
 // wlanapi.h, which is not part of the SDK used by Gears, so is replicated
@@ skipping 135 matching lines @@
 int PerformQuery(HANDLE adapter_handle,
                  BYTE* buffer,
                  DWORD buffer_size,
                  DWORD* bytes_out);
 bool ResizeBuffer(int requested_size, scoped_ptr_malloc<BYTE>* buffer);
 // Gets the system directory and appends a trailing slash if not already
 // present.
 bool GetSystemDirectory(string16* path);
 }  // namespace
 
-template<>
 WifiDataProviderImplBase* WifiDataProvider::DefaultFactoryFunction() {
   return new Win32WifiDataProvider();
 }
 
 Win32WifiDataProvider::Win32WifiDataProvider() {
 }
 
 Win32WifiDataProvider::~Win32WifiDataProvider() {
 }
 
@@ skipping 10 matching lines @@
 PollingPolicyInterface* Win32WifiDataProvider::NewPollingPolicy() {
   return new GenericPollingPolicy<kDefaultPollingInterval,
                                   kNoChangePollingInterval,
                                   kTwoNoChangePollingInterval,
                                   kNoWifiPollingIntervalMilliseconds>;
 }
 
 // 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) {
   GetWLANFunctions(library_);
 }
 
 WindowsWlanApi::~WindowsWlanApi() {
   FreeLibrary(library_);
 }
 
@@ skipping 401 matching lines @@
 
   path->assign(buffer.get(), characters_written);
 
   if (*path->rbegin() != L'\\') {
     path->append(L"\\");
   }
   DCHECK_EQ(L'\\', *path->rbegin());
   return true;
 }
 }  // namespace