Move core pieces of geolocation from chrome to content....

chrome/browser/geolocation/wifi_data_provider_mac.cc

-// 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.
-
-// For OSX 10.5 we use the system API function WirelessScanSplit. This function
-// is not documented or included in the SDK, so we use a reverse-engineered
-// header, osx_wifi_.h. This file is taken from the iStumbler project
-// (http://www.istumbler.net).
-
-#include "chrome/browser/geolocation/wifi_data_provider_mac.h"
-
-#include <dlfcn.h>
-#include <stdio.h>
-#include "base/utf_string_conversions.h"
-#include "chrome/browser/geolocation/osx_wifi.h"
-#include "chrome/browser/geolocation/wifi_data_provider_common.h"
-
-namespace {
-// The time periods, in milliseconds, between successive polls of the wifi data.
-const int kDefaultPollingInterval = 120000;  // 2 mins
-const int kNoChangePollingInterval = 300000;  // 5 mins
-const int kTwoNoChangePollingInterval = 600000;  // 10 mins
-const int kNoWifiPollingIntervalMilliseconds = 20 * 1000; // 20s
-
-// Provides the wifi API binding for use when running on OSX 10.5 machines using
-// the Apple80211 framework.
-class Apple80211Api : public WifiDataProviderCommon::WlanApiInterface {
- public:
-  Apple80211Api();
-  virtual ~Apple80211Api();
-
-  // Must be called before any other interface method. Will return false if the
-  // Apple80211 framework cannot be initialized (e.g. running on post-10.5 OSX),
-  // in which case no other method may be called.
-  bool Init();
-
-  // WlanApiInterface
-  virtual bool GetAccessPointData(WifiData::AccessPointDataSet* data);
-
- private:
-  // Handle, context and function pointers for Apple80211 library.
-  void* apple_80211_library_;
-  WirelessContext* wifi_context_;
-  WirelessAttachFunction WirelessAttach_function_;
-  WirelessScanSplitFunction WirelessScanSplit_function_;
-  WirelessDetachFunction WirelessDetach_function_;
-
-  WifiData wifi_data_;
-
-  DISALLOW_COPY_AND_ASSIGN(Apple80211Api);
-};
-
-Apple80211Api::Apple80211Api()
-    : apple_80211_library_(NULL), wifi_context_(NULL),
-      WirelessAttach_function_(NULL), WirelessScanSplit_function_(NULL),
-      WirelessDetach_function_(NULL) {
-}
-
-Apple80211Api::~Apple80211Api() {
-  if (WirelessDetach_function_)
-    (*WirelessDetach_function_)(wifi_context_);
-  dlclose(apple_80211_library_);
-}
-
-bool Apple80211Api::Init() {
-  DVLOG(1) << "Apple80211Api::Init";
-  apple_80211_library_ = dlopen(
-      "/System/Library/PrivateFrameworks/Apple80211.framework/Apple80211",
-      RTLD_LAZY);
-  if (!apple_80211_library_) {
-    DLOG(WARNING) << "Could not open Apple80211 library";
-    return false;
-  }
-  WirelessAttach_function_ = reinterpret_cast<WirelessAttachFunction>(
-      dlsym(apple_80211_library_, "WirelessAttach"));
-  WirelessScanSplit_function_ = reinterpret_cast<WirelessScanSplitFunction>(
-      dlsym(apple_80211_library_, "WirelessScanSplit"));
-  WirelessDetach_function_ = reinterpret_cast<WirelessDetachFunction>(
-      dlsym(apple_80211_library_, "WirelessDetach"));
-  DCHECK(WirelessAttach_function_);
-  DCHECK(WirelessScanSplit_function_);
-  DCHECK(WirelessDetach_function_);
-
-  if (!WirelessAttach_function_ || !WirelessScanSplit_function_ ||
-      !WirelessDetach_function_) {
-    DLOG(WARNING) << "Symbol error. Attach: " << !!WirelessAttach_function_
-        << " Split: " << !!WirelessScanSplit_function_
-        << " Detach: " << !!WirelessDetach_function_;
-    return false;
-  }
-
-  WIErr err = (*WirelessAttach_function_)(&wifi_context_, 0);
-  if (err != noErr) {
-    DLOG(WARNING) << "Error attaching: " << err;
-    return false;
-  }
-  return true;
-}
-
-bool Apple80211Api::GetAccessPointData(WifiData::AccessPointDataSet* data) {
-  DVLOG(1) << "Apple80211Api::GetAccessPointData";
-  DCHECK(data);
-  DCHECK(WirelessScanSplit_function_);
-  CFArrayRef managed_access_points = NULL;
-  CFArrayRef adhoc_access_points = NULL;
-  // Arrays returned here are owned by the caller.
-  WIErr err = (*WirelessScanSplit_function_)(wifi_context_,
-                                             &managed_access_points,
-                                             &adhoc_access_points,
-                                             0);
-  if (err != noErr) {
-    DLOG(WARNING) << "Error spliting scan: " << err;
-    return false;
-  }
-
-  if (managed_access_points == NULL) {
-    DLOG(WARNING) << "managed_access_points == NULL";
-    return false;
-  }
-
-  int num_access_points = CFArrayGetCount(managed_access_points);
-  DVLOG(1) << "Found " << num_access_points << " managed access points";
-  for (int i = 0; i < num_access_points; ++i) {
-    const WirelessNetworkInfo* access_point_info =
-        reinterpret_cast<const WirelessNetworkInfo*>(
-        CFDataGetBytePtr(
-        reinterpret_cast<const CFDataRef>(
-        CFArrayGetValueAtIndex(managed_access_points, i))));
-
-    // Currently we get only MAC address, signal strength, channel
-    // signal-to-noise and SSID
-    AccessPointData access_point_data;
-    access_point_data.mac_address =
-        MacAddressAsString16(access_point_info->macAddress);
-    // WirelessNetworkInfo::signal appears to be signal strength in dBm.
-    access_point_data.radio_signal_strength = access_point_info->signal;
-    access_point_data.channel = access_point_info->channel;
-    // WirelessNetworkInfo::noise appears to be noise floor in dBm.
-    access_point_data.signal_to_noise = access_point_info->signal -
-                                        access_point_info->noise;
-    if (!UTF8ToUTF16(reinterpret_cast<const char*>(access_point_info->name),
-                     access_point_info->nameLen,
-                     &access_point_data.ssid)) {
-      access_point_data.ssid.clear();
-    }
-    data->insert(access_point_data);
-  }
-
-  if (managed_access_points)
-    CFRelease(managed_access_points);
-  if (adhoc_access_points)
-    CFRelease(adhoc_access_points);
-
-  return true;
-}
-}  // namespace
-
-// static
-template<>
-WifiDataProviderImplBase* WifiDataProvider::DefaultFactoryFunction() {
-  return new MacWifiDataProvider();
-}
-
-MacWifiDataProvider::MacWifiDataProvider() {
-}
-
-MacWifiDataProvider::~MacWifiDataProvider() {
-}
-
-MacWifiDataProvider::WlanApiInterface* MacWifiDataProvider::NewWlanApi() {
-  // Try and find a API binding that works: first try the officially supported
-  // CoreWLAN API, and if this fails (e.g. on OSX 10.5) fall back to the reverse
-  // engineered Apple80211 API.
-  MacWifiDataProvider::WlanApiInterface* core_wlan_api = NewCoreWlanApi();
-  if (core_wlan_api)
-    return core_wlan_api;
-
-  scoped_ptr<Apple80211Api> wlan_api(new Apple80211Api);
-  if (wlan_api->Init())
-    return wlan_api.release();
-
-  DVLOG(1) << "MacWifiDataProvider : failed to initialize any wlan api";
-  return NULL;
-}
-
-PollingPolicyInterface* MacWifiDataProvider::NewPollingPolicy() {
-  return new GenericPollingPolicy<kDefaultPollingInterval,
-                                  kNoChangePollingInterval,
-                                  kTwoNoChangePollingInterval,
-                                  kNoWifiPollingIntervalMilliseconds>;
-}