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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif
#include "chrome/browser/mac/bluetooth_utility.h"
#import <Foundation/Foundation.h>
#import <IOBluetooth/IOBluetooth.h>
#include <IOKit/IOKitLib.h>
#include "base/apple/bridging.h"
#include "base/apple/foundation_util.h"
#include "base/mac/mac_util.h"
#include "base/mac/scoped_ioobject.h"
namespace bluetooth_utility {
BluetoothAvailability GetBluetoothAvailability() {
base::apple::ScopedCFTypeRef<CFMutableDictionaryRef> matching_dict(
IOServiceMatching("IOBluetoothHCIController"));
if (!matching_dict)
return BLUETOOTH_AVAILABILITY_ERROR;
// IOServiceGetMatchingServices takes ownership of matching_dict.
io_iterator_t iter;
int kr = IOServiceGetMatchingServices(kIOMainPortDefault,
matching_dict.release(), &iter);
if (kr != KERN_SUCCESS)
return BLUETOOTH_NOT_AVAILABLE;
base::mac::ScopedIOObject<io_iterator_t> scoped_iter(iter);
int bluetooth_available = false;
base::mac::ScopedIOObject<io_service_t> device;
while (device.reset(IOIteratorNext(scoped_iter.get())), device) {
bluetooth_available = true;
base::apple::ScopedCFTypeRef<CFMutableDictionaryRef> dict;
kr = IORegistryEntryCreateCFProperties(device.get(), dict.InitializeInto(),
kCFAllocatorDefault, kNilOptions);
if (kr != KERN_SUCCESS)
continue;
NSDictionary* objc_dict = base::apple::CFToNSPtrCast(dict.get());
NSNumber* lmp_version =
base::apple::ObjCCast<NSNumber>(objc_dict[@"LMPVersion"]);
if (!lmp_version)
continue;
// The LMP version is too low to support Bluetooth LE.
if ([lmp_version intValue] < 6)
continue;
NSData* data =
base::apple::ObjCCast<NSData>(objc_dict[@"HCISupportedFeatures"]);
NSUInteger supported_features_index = 4;
NSUInteger length = [data length];
if (length < supported_features_index + 1)
continue;
// The bytes are indexed in reverse order.
NSUInteger index = length - supported_features_index - 1;
const unsigned char* bytes =
static_cast<const unsigned char*>([data bytes]);
const unsigned char byte = bytes[index];
bool le_supported = byte & kBluetoothFeatureLESupportedController;
if (le_supported)
return BLUETOOTH_AVAILABLE_WITH_LE;
}
return bluetooth_available ? BLUETOOTH_AVAILABLE_WITHOUT_LE
: BLUETOOTH_AVAILABILITY_ERROR;
}
} // namespace bluetooth_utility
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