Revert 76228 - Move core pieces of geolocation from chrome to content.This is...

content/browser/geolocation/wifi_data_provider_corewlan_mac.mm

-// 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.
-
-// Implements a WLAN API binding for CoreWLAN, as available on OSX 10.6
-
-#include "content/browser/geolocation/wifi_data_provider_mac.h"
-
-#include <dlfcn.h>
-#import <Foundation/Foundation.h>
-
-#include "base/mac/scoped_nsautorelease_pool.h"
-#include "base/scoped_nsobject.h"
-#include "base/sys_string_conversions.h"
-
-// Define a subset of the CoreWLAN interfaces we require. We can't depend on
-// CoreWLAN.h existing as we need to build on 10.5 SDKs. We can't just send
-// messages to an untyped id due to the build treating warnings as errors,
-// hence the reason we need class definitions.
-// TODO(joth): When we build all 10.6 code exclusively 10.6 SDK (or later)
-// tidy this up to use the framework directly. See http://crbug.com/37703
-
-@interface CWInterface : NSObject
-+ (CWInterface*)interface;
-+ (CWInterface*)interfaceWithName:(NSString*)name;
-+ (NSArray*)supportedInterfaces;
-- (NSArray*)scanForNetworksWithParameters:(NSDictionary*)parameters
-                                    error:(NSError**)error;
-@end
-
-@interface CWNetwork : NSObject <NSCopying, NSCoding>
-@property (nonatomic, readonly) NSString* ssid;
-@property (nonatomic, readonly) NSString* bssid;
-@property (nonatomic, readonly) NSData* bssidData;
-@property (nonatomic, readonly) NSNumber* securityMode;
-@property (nonatomic, readonly) NSNumber* phyMode;
-@property (nonatomic, readonly) NSNumber* channel;
-@property (nonatomic, readonly) NSNumber* rssi;
-@property (nonatomic, readonly) NSNumber* noise;
-@property (nonatomic, readonly) NSData* ieData;
-@property (nonatomic, readonly) BOOL isIBSS;
-- (BOOL)isEqualToNetwork:(CWNetwork*)network;
-@end
-
-class CoreWlanApi : public WifiDataProviderCommon::WlanApiInterface {
- public:
-  CoreWlanApi() {}
-
-  // Must be called before any other interface method. Will return false if the
-  // CoreWLAN framework cannot be initialized (e.g. running on pre-10.6 OSX),
-  // in which case no other method may be called.
-  bool Init();
-
-  // WlanApiInterface
-  virtual bool GetAccessPointData(WifiData::AccessPointDataSet* data);
-
- private:
-  scoped_nsobject<NSBundle> bundle_;
-  scoped_nsobject<NSString> merge_key_;
-
-  DISALLOW_COPY_AND_ASSIGN(CoreWlanApi);
-};
-
-bool CoreWlanApi::Init() {
-  // As the WLAN api binding runs on its own thread, we need to provide our own
-  // auto release pool. It's simplest to do this as an automatic variable in
-  // each method that needs it, to ensure the scoping is correct and does not
-  // interfere with any other code using autorelease pools on the thread.
-  base::mac::ScopedNSAutoreleasePool auto_pool;
-  bundle_.reset([[NSBundle alloc]
-      initWithPath:@"/System/Library/Frameworks/CoreWLAN.framework"]);
-  if (!bundle_) {
-    DVLOG(1) << "Failed to load the CoreWLAN framework bundle";
-    return false;
-  }
-
-  // Dynamically look up the value of the kCWScanKeyMerge (i.e. without build
-  // time dependency on the 10.6 specific library).
-  void* dl_handle = dlopen([[bundle_ executablePath] fileSystemRepresentation],
-                           RTLD_LAZY | RTLD_LOCAL);
-  if (dl_handle) {
-    NSString* key = *reinterpret_cast<NSString**>(dlsym(dl_handle,
-                                                        "kCWScanKeyMerge"));
-    if (key)
-      merge_key_.reset([key copy]);
-  }
-  // "Leak" dl_handle rather than dlclose it, to ensure |merge_key_|
-  // remains valid.
-  if (!merge_key_.get()) {
-    // Fall back to a known-working value should the lookup fail (if
-    // this value is itself wrong it's not the end of the world, we might just
-    // get very slightly lower quality location fixes due to SSID merges).
-    DLOG(WARNING) << "Could not dynamically load the CoreWLAN merge key";
-    merge_key_.reset([@"SCAN_MERGE" retain]);
-  }
-
-  return true;
-}
-
-bool CoreWlanApi::GetAccessPointData(WifiData::AccessPointDataSet* data) {
-  base::mac::ScopedNSAutoreleasePool auto_pool;
-  // Initialize the scan parameters with scan key merging disabled, so we get
-  // every AP listed in the scan without any SSID de-duping logic.
-  NSDictionary* params =
-      [NSDictionary dictionaryWithObject:[NSNumber numberWithBool:NO]
-                                  forKey:merge_key_.get()];
-
-  Class cw_interface_class = [bundle_ classNamed:@"CWInterface"];
-  NSArray* supported_interfaces = [cw_interface_class supportedInterfaces];
-  uint interface_error_count = 0;
-  for (NSString* interface_name in supported_interfaces) {
-    CWInterface* corewlan_interface =
-        [cw_interface_class interfaceWithName:interface_name];
-    if (!corewlan_interface) {
-      DLOG(WARNING) << interface_name << ": initWithName failed";
-      ++interface_error_count;
-      continue;
-    }
-
-    NSError* err = nil;
-    NSArray* scan = [corewlan_interface scanForNetworksWithParameters:params
-                                                                error:&err];
-    const int error_code = [err code];
-    const int count = [scan count];
-    // We could get an error code but count != 0 if the scan was interrupted,
-    // for example. For our purposes this is not fatal, so process as normal.
-    if (error_code && count == 0) {
-      DLOG(WARNING) << interface_name << ": CoreWLAN scan failed with error "
-                    << error_code;
-      ++interface_error_count;
-      continue;
-    }
-    DVLOG(1) << interface_name << ": found " << count << " wifi APs";
-
-    for (CWNetwork* network in scan) {
-      DCHECK(network);
-      AccessPointData access_point_data;
-      NSData* mac = [network bssidData];
-      DCHECK([mac length] == 6);
-      access_point_data.mac_address = MacAddressAsString16(
-          static_cast<const uint8*>([mac bytes]));
-      access_point_data.radio_signal_strength = [[network rssi] intValue];
-      access_point_data.channel = [[network channel] intValue];
-      access_point_data.signal_to_noise =
-          access_point_data.radio_signal_strength - [[network noise] intValue];
-      access_point_data.ssid = base::SysNSStringToUTF16([network ssid]);
-      data->insert(access_point_data);
-    }
-  }
-  // Return true even if some interfaces failed to scan, so long as at least
-  // one interface did not fail.
-  return interface_error_count == 0 ||
-         [supported_interfaces count] > interface_error_count;
-}
-
-WifiDataProviderCommon::WlanApiInterface* NewCoreWlanApi() {
-  scoped_ptr<CoreWlanApi> self(new CoreWlanApi);
-  if (self->Init())
-    return self.release();
-
-  return NULL;
-}