Ref T258, added compress utils for better encapsulation

src/blackmisc/compressutils.h

@@ -0,0 +1,43 @@
+/* Copyright (C) 2018
+ * swift project Community / Contributors
+ *
+ * This file is part of swift project. It is subject to the license terms in the LICENSE file found in the top-level
+ * directory of this distribution and at http://www.swift-project.org/license.html. No part of swift project,
+ * including this file, may be copied, modified, propagated, or distributed except according to the terms
+ * contained in the LICENSE file.
+ */
+
+//! \file
+
+#ifndef BLACKMISC_COMPRESSUTILS_H
+#define BLACKMISC_COMPRESSUTILS_H
+
+#include "blackmisc/blackmiscexport.h"
+#include <QByteArray>
+#include <QStringList>
+
+namespace BlackMisc
+{
+    //! Compress utilities
+    class BLACKMISC_EXPORT CCompressUtils
+    {
+    public:
+        //! Length header
+        //! \remark 4 bytes -> 32bit
+        static QByteArray lengthHeader(qint32 size);
+
+        //! Unzip my using 7zip
+        //! \remark relies on external 7zip command line
+        static bool zip7Uncompress(const QString &file, const QString &directory, bool wait, QStringList *stdOutAndError = nullptr);
+
+        //! External program existing?
+        //! \remark relies on external 7zip command line
+        static bool hasZip7();
+
+    private:
+        //! Ctor
+        CCompressUtils() {}
+    };
+} // ns
+
+#endif // guard