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// 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
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