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| 1 // Copyright (c) 2010 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "content/browser/geolocation/wifi_data_provider_common_win.h" |
| 6 |
| 7 #include <assert.h> |
| 8 #include <stdint.h> |
| 9 |
| 10 #include "base/strings/utf_string_conversions.h" |
| 11 #include "content/browser/geolocation/wifi_data_provider_common.h" |
| 12 |
| 13 namespace content { |
| 14 |
| 15 bool ConvertToAccessPointData(const NDIS_WLAN_BSSID& data, |
| 16 AccessPointData *access_point_data) { |
| 17 // Currently we get only MAC address, signal strength and SSID. |
| 18 // TODO(steveblock): Work out how to get age, channel and signal-to-noise. |
| 19 DCHECK(access_point_data); |
| 20 access_point_data->mac_address = MacAddressAsString16(data.MacAddress); |
| 21 access_point_data->radio_signal_strength = data.Rssi; |
| 22 // Note that _NDIS_802_11_SSID::Ssid::Ssid is not null-terminated. |
| 23 base::UTF8ToUTF16(reinterpret_cast<const char*>(data.Ssid.Ssid), |
| 24 data.Ssid.SsidLength, |
| 25 &access_point_data->ssid); |
| 26 return true; |
| 27 } |
| 28 |
| 29 int GetDataFromBssIdList(const NDIS_802_11_BSSID_LIST& bss_id_list, |
| 30 int list_size, |
| 31 WifiData::AccessPointDataSet* data) { |
| 32 // Walk through the BSS IDs. |
| 33 int found = 0; |
| 34 const uint8_t* iterator = |
| 35 reinterpret_cast<const uint8_t*>(&bss_id_list.Bssid[0]); |
| 36 const uint8_t* end_of_buffer = |
| 37 reinterpret_cast<const uint8_t*>(&bss_id_list) + list_size; |
| 38 for (int i = 0; i < static_cast<int>(bss_id_list.NumberOfItems); ++i) { |
| 39 const NDIS_WLAN_BSSID *bss_id = |
| 40 reinterpret_cast<const NDIS_WLAN_BSSID*>(iterator); |
| 41 // Check that the length of this BSS ID is reasonable. |
| 42 if (bss_id->Length < sizeof(NDIS_WLAN_BSSID) || |
| 43 iterator + bss_id->Length > end_of_buffer) { |
| 44 break; |
| 45 } |
| 46 AccessPointData access_point_data; |
| 47 if (ConvertToAccessPointData(*bss_id, &access_point_data)) { |
| 48 data->insert(access_point_data); |
| 49 ++found; |
| 50 } |
| 51 // Move to the next BSS ID. |
| 52 iterator += bss_id->Length; |
| 53 } |
| 54 return found; |
| 55 } |
| 56 |
| 57 } // namespace content |
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