wifi_data_provider_common_win.cc revision 868fa2fe829687343ffae624259930155e16dbd8 
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
9#include "base/strings/utf_string_conversions.h"
10#include "content/browser/geolocation/device_data_provider.h"
11#include "content/browser/geolocation/wifi_data_provider_common.h"
12
13namespace content {
14
15bool 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  UTF8ToUTF16(reinterpret_cast<const char*>(data.Ssid.Ssid),
24              data.Ssid.SsidLength,
25              &access_point_data->ssid);
26  return true;
27}
28
29int 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 *iterator = reinterpret_cast<const uint8*>(&bss_id_list.Bssid[0]);
35  const uint8 *end_of_buffer =
36      reinterpret_cast<const uint8*>(&bss_id_list) + list_size;
37  for (int i = 0; i < static_cast<int>(bss_id_list.NumberOfItems); ++i) {
38    const NDIS_WLAN_BSSID *bss_id =
39        reinterpret_cast<const NDIS_WLAN_BSSID*>(iterator);
40    // Check that the length of this BSS ID is reasonable.
41    if (bss_id->Length < sizeof(NDIS_WLAN_BSSID) ||
42        iterator + bss_id->Length > end_of_buffer) {
43      break;
44    }
45    AccessPointData access_point_data;
46    if (ConvertToAccessPointData(*bss_id, &access_point_data)) {
47      data->insert(access_point_data);
48      ++found;
49    }
50    // Move to the next BSS ID.
51    iterator += bss_id->Length;
52  }
53  return found;
54}
55
56}  // namespace content
57