Add the QStorageInfo class

Allows to retrieve information about mounted volumes such as label,
total/available size, filesystem type and so on.
Possible use cases are:
- allows to do checks about filesystem before performing actual
  operation (such as available/maximum volume size)
- allows to retrive information about volume that can be shown in file
  dialogs
- allows to retrieve volume for specific path and check if two or more
  paths belong to the same volume or not

[ChangeLog][QtCore] Added QStorageInfo class to retrive information
about mounted volumes and drives

Change-Id: Ibf9c2e6b53ef39c5605894a4422acdbbca4030c4
Reviewed-by: Shawn Rutledge <shawn.rutledge@digia.com>

1 files changed, 122 insertions, 0 deletions

diff --git a/src/corelib/io/qstorageinfo.h b/src/corelib/io/qstorageinfo.h
new file mode 100644
index 0000000000..0a4a620205
--- /dev/null
+++ b/src/corelib/io/qstorageinfo.h
@@ -0,0 +1,122 @@
+/****************************************************************************
+**
+** Copyright (C) 2014 Ivan Komissarov <ABBAPOH@gmail.com>
+** Contact: http://www.qt-project.org/legal
+**
+** This file is part of the QtCore module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** 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 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: 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.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#ifndef QSTORAGEINFO_H
+#define QSTORAGEINFO_H
+
+#include <QtCore/qbytearray.h>
+#include <QtCore/qdir.h>
+#include <QtCore/qlist.h>
+#include <QtCore/qmetatype.h>
+#include <QtCore/qstring.h>
+#include <QtCore/qshareddata.h>
+
+QT_BEGIN_NAMESPACE
+
+class QStorageInfoPrivate;
+class Q_CORE_EXPORT QStorageInfo
+{
+public:
+    QStorageInfo();
+    explicit QStorageInfo(const QString &path);
+    explicit QStorageInfo(const QDir &dir);
+    QStorageInfo(const QStorageInfo &other);
+    ~QStorageInfo();
+
+    QStorageInfo &operator=(const QStorageInfo &other);
+#ifdef Q_COMPILER_RVALUE_REFS
+    inline QStorageInfo &operator=(QStorageInfo &&other)
+    { qSwap(d, other.d); return *this; }
+#endif
+
+    inline void swap(QStorageInfo &other)
+    { qSwap(d, other.d); }
+
+    void setPath(const QString &path);
+
+    QString rootPath() const;
+    QByteArray device() const;
+    QByteArray fileSystemType() const;
+    QString name() const;
+    QString displayName() const;
+
+    qint64 bytesTotal() const;
+    qint64 bytesFree() const;
+    qint64 bytesAvailable() const;
+
+    inline bool isRoot() const;
+    bool isReadOnly() const;
+    bool isReady() const;
+    bool isValid() const;
+
+    void refresh();
+
+    static QList<QStorageInfo> mountedVolumes();
+    static QStorageInfo root();
+
+private:
+    friend class QStorageInfoPrivate;
+    friend bool operator==(const QStorageInfo &first, const QStorageInfo &second);
+    QExplicitlySharedDataPointer<QStorageInfoPrivate> d;
+};
+
+inline bool operator==(const QStorageInfo &first, const QStorageInfo &second)
+{
+    if (first.d == second.d)
+        return true;
+    return first.device() == second.device();
+}
+
+inline bool operator!=(const QStorageInfo &first, const QStorageInfo &second)
+{
+    return !(first == second);
+}
+
+inline bool QStorageInfo::isRoot() const
+{ return *this == QStorageInfo::root(); }
+
+Q_DECLARE_SHARED(QStorageInfo)
+
+QT_END_NAMESPACE
+
+Q_DECLARE_METATYPE(QStorageInfo)
+
+#endif // QSTORAGEINFO_H