| // 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 "device/geolocation/wifi_data_provider_common_win.h" |
| |
| #include <assert.h> |
| #include <stdint.h> |
| |
| #include "base/strings/utf_string_conversions.h" |
| #include "device/geolocation/wifi_data_provider_common.h" |
| |
| namespace device { |
| |
| 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. |
| base::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_t* iterator = |
| reinterpret_cast<const uint8_t*>(&bss_id_list.Bssid[0]); |
| const uint8_t* end_of_buffer = |
| reinterpret_cast<const uint8_t*>(&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; |
| } |
| |
| } // namespace device |