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/wifi_data_provider_common.h"
11
12namespace content {
13
14bool ConvertToAccessPointData(const NDIS_WLAN_BSSID& data,
15                              AccessPointData *access_point_data) {
16  // Currently we get only MAC address, signal strength and SSID.
17  // TODO(steveblock): Work out how to get age, channel and signal-to-noise.
18  DCHECK(access_point_data);
19  access_point_data->mac_address = MacAddressAsString16(data.MacAddress);
20  access_point_data->radio_signal_strength = data.Rssi;
21  // Note that _NDIS_802_11_SSID::Ssid::Ssid is not null-terminated.
22  base::UTF8ToUTF16(reinterpret_cast<const char*>(data.Ssid.Ssid),
23                    data.Ssid.SsidLength,
24                    &access_point_data->ssid);
25  return true;
26}
27
28int GetDataFromBssIdList(const NDIS_802_11_BSSID_LIST& bss_id_list,
29                         int list_size,
30                         WifiData::AccessPointDataSet* data) {
31  // Walk through the BSS IDs.
32  int found = 0;
33  const uint8 *iterator = reinterpret_cast<const uint8*>(&bss_id_list.Bssid[0]);
34  const uint8 *end_of_buffer =
35      reinterpret_cast<const uint8*>(&bss_id_list) + list_size;
36  for (int i = 0; i < static_cast<int>(bss_id_list.NumberOfItems); ++i) {
37    const NDIS_WLAN_BSSID *bss_id =
38        reinterpret_cast<const NDIS_WLAN_BSSID*>(iterator);
39    // Check that the length of this BSS ID is reasonable.
40    if (bss_id->Length < sizeof(NDIS_WLAN_BSSID) ||
41        iterator + bss_id->Length > end_of_buffer) {
42      break;
43    }
44    AccessPointData access_point_data;
45    if (ConvertToAccessPointData(*bss_id, &access_point_data)) {
46      data->insert(access_point_data);
47      ++found;
48    }
49    // Move to the next BSS ID.
50    iterator += bss_id->Length;
51  }
52  return found;
53}
54
55}  // namespace content
56