Implement BluetoothRemoteGattServiceWin and related unit tests

device/bluetooth/bluetooth_low_energy_win.cc

 // Copyright 2014 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/bluetooth/bluetooth_low_energy_win.h"
 
 #include "base/files/file.h"
 #include "base/logging.h"
 #include "base/macros.h"
 #include "base/strings/sys_string_conversions.h"
@@ skipping 632 matching lines @@
 }
 
 BluetoothLowEnergyDeviceInfo::BluetoothLowEnergyDeviceInfo()
     : visible(false), authenticated(false), connected(false) {
   address.ullLong = BLUETOOTH_NULL_ADDRESS;
 }
 
 BluetoothLowEnergyDeviceInfo::~BluetoothLowEnergyDeviceInfo() {
 }
 
-bool IsBluetoothLowEnergySupported() {
-  return base::win::GetVersion() >= base::win::VERSION_WIN8;
-}
-
 bool ExtractBluetoothAddressFromDeviceInstanceIdForTesting(
     const std::string& instance_id,
     BLUETOOTH_ADDRESS* btha,
     std::string* error) {
   return ExtractBluetoothAddressFromDeviceInstanceId(instance_id, btha, error);
 }
 
 BluetoothLowEnergyWrapper* BluetoothLowEnergyWrapper::GetInstance() {
   if (g_instance_ == nullptr) {
     g_instance_ = new BluetoothLowEnergyWrapper();
   }
   return g_instance_;
 }
 
 void BluetoothLowEnergyWrapper::DeleteInstance() {
   delete g_instance_;
   g_instance_ = nullptr;
 }
 
 void BluetoothLowEnergyWrapper::SetInstanceForTest(
     BluetoothLowEnergyWrapper* instance) {
   delete g_instance_;
   g_instance_ = instance;
 }
 
 BluetoothLowEnergyWrapper::BluetoothLowEnergyWrapper() {}
 BluetoothLowEnergyWrapper::~BluetoothLowEnergyWrapper() {}
 
+bool BluetoothLowEnergyWrapper::IsBluetoothLowEnergySupported() {
+  return base::win::GetVersion() >= base::win::VERSION_WIN8;
+}
+
 bool BluetoothLowEnergyWrapper::EnumerateKnownBluetoothLowEnergyDevices(
     ScopedVector<BluetoothLowEnergyDeviceInfo>* devices,
     std::string* error) {
   if (!IsBluetoothLowEnergySupported()) {
     *error = kPlatformNotSupported;
     return false;
   }
 
   return EnumerateKnownBLEOrBLEGattServiceDevices(
       GUID_BLUETOOTHLE_DEVICE_INTERFACE, devices, error);
@@ skipping 17 matching lines @@
     ScopedVector<BluetoothLowEnergyServiceInfo>* services,
     std::string* error) {
   if (!IsBluetoothLowEnergySupported()) {
     *error = kPlatformNotSupported;
     return false;
   }
 
   return CollectBluetoothLowEnergyDeviceServices(device_path, services, error);
 }
 
+HRESULT BluetoothLowEnergyWrapper::ReadCharacteristicsOfAService(
+    base::FilePath& service_path,
+    const PBTH_LE_GATT_SERVICE service,
+    scoped_ptr<BTH_LE_GATT_CHARACTERISTIC>* out_included_characteristics,
+    USHORT* out_counts) {
+  base::File file(service_path, base::File::FLAG_OPEN | base::File::FLAG_READ);
+  if (!file.IsValid())
+    return HRESULT_FROM_WIN32(ERROR_OPEN_FAILED);
+
+  USHORT required_length = 0;
+  HRESULT hr = BluetoothGATTGetCharacteristics(file.GetPlatformFile(), service,
+                                               0, NULL, &required_length,
+                                               BLUETOOTH_GATT_FLAG_NONE);
+  if (hr != HRESULT_FROM_WIN32(ERROR_MORE_DATA))
+    return hr;
+
+  out_included_characteristics->reset(
+      new BTH_LE_GATT_CHARACTERISTIC[required_length]);
+  USHORT actual_length = required_length;
+  hr = BluetoothGATTGetCharacteristics(
+      file.GetPlatformFile(), service, actual_length,
+      out_included_characteristics->get(), &required_length,
+      BLUETOOTH_GATT_FLAG_NONE);
+  if (SUCCEEDED(hr) && required_length != actual_length) {
+    LOG(ERROR) << "Retrieved charactersitics is not equal to expected"
+               << " actual_length " << actual_length << " required_length "
+               << required_length;
+    hr = HRESULT_FROM_WIN32(ERROR_INVALID_USER_BUFFER);
+  }
+  *out_counts = actual_length;
+
+  if (FAILED(hr)) {
+    out_included_characteristics->reset(nullptr);
+    *out_counts = 0;
+  }
+  return hr;
+}
+
 }  // namespace win
 }  // namespace device