Add discovering for BLE devices on Windows

BLE devices are supported in Windows 8 and above. Windows has not
public API to discovering/pairing of BLE devices. A user shall do
it by means of standard "bluetooth" application which are inbox into
Windows. Only after that there is an opportunity to display the
discovered devices.

Change-Id: Idd3d2949456a32c8c333744205755853aef80422
Reviewed-by: Alex Blasche <alexander.blasche@theqtcompany.com>

3 files changed, 342 insertions, 2 deletions

diff --git a/src/bluetooth/windows/qwinlowenergybluetooth.cpp b/src/bluetooth/windows/qwinlowenergybluetooth.cpp
new file mode 100644
index 00000000..f4f34e42
--- /dev/null
+++ b/src/bluetooth/windows/qwinlowenergybluetooth.cpp
@@ -0,0 +1,264 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Copyright (C) 2014 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtBluetooth module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia. For licensing terms and
+** conditions see http://qt.digia.com/licensing. For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights. These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qwinlowenergybluetooth_p.h"
+
+#include <QtCore/quuid.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace WinLowEnergyBluetooth {
+
+static QString deviceRegistryProperty(
+        HDEVINFO deviceInfoHandle,
+        const PSP_DEVINFO_DATA deviceInfoData,
+        DWORD registryProperty)
+{
+    DWORD propertyRegDataType = 0;
+    DWORD propertyBufferSize = 0;
+    QByteArray propertyBuffer;
+
+    while (!::SetupDiGetDeviceRegistryProperty(
+               deviceInfoHandle,
+               deviceInfoData,
+               registryProperty,
+               &propertyRegDataType,
+               reinterpret_cast<PBYTE>(propertyBuffer.data()),
+               propertyBuffer.size(),
+               &propertyBufferSize)) {
+
+        const DWORD error = ::GetLastError();
+
+        if (error != ERROR_INSUFFICIENT_BUFFER
+                || (propertyRegDataType != REG_SZ
+                    && propertyRegDataType != REG_EXPAND_SZ)) {
+            return QString();
+        }
+
+        propertyBuffer.fill(0, propertyBufferSize * sizeof(WCHAR));
+    }
+
+    return QString::fromWCharArray(
+                reinterpret_cast<const wchar_t *>(propertyBuffer.constData()));
+}
+
+static QString deviceFriendlyName(
+        HDEVINFO deviceInfoSet, PSP_DEVINFO_DATA deviceInfoData)
+{
+    return deviceRegistryProperty(
+                deviceInfoSet, deviceInfoData, SPDRP_FRIENDLYNAME);
+}
+
+static QString deviceService(
+        HDEVINFO deviceInfoSet, PSP_DEVINFO_DATA deviceInfoData)
+{
+    return deviceRegistryProperty(
+                deviceInfoSet, deviceInfoData, SPDRP_SERVICE);
+}
+
+static QString deviceSystemPath(
+        const PSP_INTERFACE_DEVICE_DETAIL_DATA detailData)
+{
+    return QString::fromWCharArray(detailData->DevicePath);
+}
+
+static QBluetoothAddress parseRemoteAddress(const QString &devicePath)
+{
+    const int firstbound = devicePath.indexOf(QStringLiteral("dev_"));
+    const int lastbound = devicePath.indexOf(QLatin1Char('#'), firstbound);
+
+    const QString hex =
+            devicePath.mid(firstbound + 4, lastbound - firstbound - 4);
+
+    bool ok = false;
+    return QBluetoothAddress(hex.toULongLong(&ok, 16));
+}
+
+DeviceInfo::DeviceInfo(
+        const QBluetoothAddress &address,
+        const QString &name,
+        const QString &systemPath)
+    : address(address)
+    , name(name)
+    , systemPath(systemPath)
+{
+}
+
+DeviceDiscoveryResult::DeviceDiscoveryResult()
+    : error(NO_ERROR)
+{
+}
+
+static DeviceDiscoveryResult availableSystemInterfaces(
+        const GUID &deviceInterface)
+{
+    const DWORD flags = DIGCF_PRESENT | DIGCF_DEVICEINTERFACE;
+    const HDEVINFO deviceInfoHandle = ::SetupDiGetClassDevs(
+                &deviceInterface, 0, 0, flags);
+
+    DeviceDiscoveryResult result;
+
+    if (deviceInfoHandle == INVALID_HANDLE_VALUE) {
+        result.error = ::GetLastError();
+        return result;
+    }
+
+    DWORD index = 0;
+
+    forever {
+
+        SP_DEVICE_INTERFACE_DATA deviceInterfaceData;
+        ::ZeroMemory(&deviceInterfaceData, sizeof(deviceInterfaceData));
+        deviceInterfaceData.cbSize = sizeof(deviceInterfaceData);
+
+        if (!::SetupDiEnumDeviceInterfaces(
+                    deviceInfoHandle,
+                    NULL,
+                    &deviceInterface,
+                    index++,
+                    &deviceInterfaceData)) {
+
+            result.error = ::GetLastError();
+            break;
+        }
+
+        DWORD deviceInterfaceDetailDataSize = 0;
+        if (!::SetupDiGetDeviceInterfaceDetail(
+                    deviceInfoHandle,
+                    &deviceInterfaceData,
+                    NULL,
+                    deviceInterfaceDetailDataSize,
+                    &deviceInterfaceDetailDataSize,
+                    NULL)) {
+
+            const DWORD error = ::GetLastError();
+            if (error != ERROR_INSUFFICIENT_BUFFER) {
+                result.error = ::GetLastError();
+
+                break;
+            }
+        }
+
+        SP_DEVINFO_DATA deviceInfoData;
+        ::ZeroMemory(&deviceInfoData, sizeof(deviceInfoData));
+        deviceInfoData.cbSize = sizeof(deviceInfoData);
+
+        QByteArray deviceInterfaceDetailDataBuffer(
+                    deviceInterfaceDetailDataSize, 0);
+
+        PSP_INTERFACE_DEVICE_DETAIL_DATA deviceInterfaceDetailData =
+                reinterpret_cast<PSP_INTERFACE_DEVICE_DETAIL_DATA>
+                (deviceInterfaceDetailDataBuffer.data());
+
+        deviceInterfaceDetailData->cbSize =
+                sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
+
+        if (!::SetupDiGetDeviceInterfaceDetail(
+                    deviceInfoHandle,
+                    &deviceInterfaceData,
+                    deviceInterfaceDetailData,
+                    deviceInterfaceDetailDataBuffer.size(),
+                    &deviceInterfaceDetailDataSize,
+                    &deviceInfoData)) {
+            result.error = ::GetLastError();
+            break;
+        }
+
+        const QString systemPath =
+                deviceSystemPath(deviceInterfaceDetailData);
+
+        const QBluetoothAddress address = parseRemoteAddress(systemPath);
+        if (address.isNull())
+            continue;
+
+        const QString friendlyName =
+                deviceFriendlyName(deviceInfoHandle, &deviceInfoData);
+
+        const DeviceInfo info(address, friendlyName, systemPath);
+        result.devices.append(info);
+
+    }
+
+    ::SetupDiDestroyDeviceInfoList(deviceInfoHandle);
+    return result;
+}
+
+static QStringList availableSystemServices(const GUID &deviceInterface)
+{
+    const DWORD flags = DIGCF_PRESENT;
+    const HDEVINFO deviceInfoHandle = ::SetupDiGetClassDevs(
+                &deviceInterface, NULL, 0, flags);
+
+    if (deviceInfoHandle == INVALID_HANDLE_VALUE)
+        return QStringList();
+
+    SP_DEVINFO_DATA deviceInfoData;
+    ::memset(&deviceInfoData, 0, sizeof(deviceInfoData));
+    deviceInfoData.cbSize = sizeof(deviceInfoData);
+
+    DWORD index = 0;
+    QStringList result;
+
+    while (::SetupDiEnumDeviceInfo(
+               deviceInfoHandle, index++, &deviceInfoData)) {
+
+        const QString service = deviceService(deviceInfoHandle, &deviceInfoData);
+        if (service.isEmpty())
+            continue;
+
+        result.append(service);
+    }
+
+    ::SetupDiDestroyDeviceInfoList(deviceInfoHandle);
+    return result;
+}
+
+DeviceDiscoveryResult startDiscoveryOfRemoteDevices()
+{
+    return availableSystemInterfaces(
+                QUuid("781aee18-7733-4ce4-add0-91f41c67b592"));
+}
+
+bool hasLocalRadio()
+{
+    const QStringList systemServices =
+            availableSystemServices(
+                QUuid("e0cbf06c-cd8b-4647-bb8a-263b43f0f974"));
+
+    return systemServices.contains(QStringLiteral("BthLEEnum"));
+}
+
+} // namespace WinLowEnergyBluetooth
+
+QT_END_NAMESPACE
diff --git a/src/bluetooth/windows/qwinlowenergybluetooth_p.h b/src/bluetooth/windows/qwinlowenergybluetooth_p.h
new file mode 100644
index 00000000..aa9127a4
--- /dev/null
+++ b/src/bluetooth/windows/qwinlowenergybluetooth_p.h
@@ -0,0 +1,74 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Digia Plc and/or its subsidiary(-ies).
+** Copyright (C) 2014 Denis Shienkov <denis.shienkov@gmail.com>
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtBluetooth module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL21$
+** Commercial License Usage
+** Licensees holding valid commercial Qt licenses may use this file in
+** accordance with the commercial license agreement provided with the
+** Software or, alternatively, in accordance with the terms contained in
+** a written agreement between you and Digia. For licensing terms and
+** conditions see http://qt.digia.com/licensing. For further information
+** use the contact form at http://qt.digia.com/contact-us.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 or version 3 as published by the Free
+** Software Foundation and appearing in the file LICENSE.LGPLv21 and
+** LICENSE.LGPLv3 included in the packaging of this file. Please review the
+** following information to ensure the GNU Lesser General Public License
+** requirements will be met: https://www.gnu.org/licenses/lgpl.html and
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Digia gives you certain additional
+** rights. These rights are described in the Digia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QWINLOWENERGYBLUETOOTH_P_H
+#define QWINLOWENERGYBLUETOOTH_P_H
+
+#include <QtCore/qstringlist.h>
+
+#include <QtBluetooth/qbluetoothaddress.h>
+
+#include <qt_windows.h>
+#include <setupapi.h>
+
+QT_BEGIN_NAMESPACE
+
+namespace WinLowEnergyBluetooth {
+
+struct DeviceInfo
+{
+    DeviceInfo(const QBluetoothAddress &address,
+               const QString &name,
+               const QString &systemPath);
+    QBluetoothAddress address;
+    QString name;
+    QString systemPath;
+};
+
+struct DeviceDiscoveryResult
+{
+    DeviceDiscoveryResult();
+    QList<DeviceInfo> devices;
+    DWORD error;
+};
+
+bool hasLocalRadio();
+
+DeviceDiscoveryResult startDiscoveryOfRemoteDevices();
+
+} // namespace WinLowEnergyBluetooth
+
+QT_END_NAMESPACE
+
+#endif // QWINLOWENERGYBLUETOOTH_P_H
diff --git a/src/bluetooth/windows/windows.pri b/src/bluetooth/windows/windows.pri
index f08e0497..84e7200a 100644
--- a/src/bluetooth/windows/windows.pri
+++ b/src/bluetooth/windows/windows.pri
@@ -1,5 +1,7 @@
 PRIVATE_HEADERS += \
-    windows/qwinclassicbluetooth_p.h
+    windows/qwinclassicbluetooth_p.h \
+    windows/qwinlowenergybluetooth_p.h
 
 SOURCES += \
-    windows/qwinclassicbluetooth.cpp
+    windows/qwinclassicbluetooth.cpp \
+    windows/qwinlowenergybluetooth.cpp