Index: sources/storage/FileHandler.h
===================================================================
diff -u -r6c6f1f5d466badd9b4fd67be7c907234c342b2a2 -r5687815256ae070a9a207107088e3f72dd464da0
--- sources/storage/FileHandler.h	(.../FileHandler.h)	(revision 6c6f1f5d466badd9b4fd67be7c907234c342b2a2)
+++ sources/storage/FileHandler.h	(.../FileHandler.h)	(revision 5687815256ae070a9a207107088e3f72dd464da0)
@@ -1,30 +1,26 @@
 /*!
  *
- * Copyright (c) 2020-2023 Diality Inc. - All Rights Reserved.
+ * Copyright (c) 2020-2024 Diality Inc. - All Rights Reserved.
  * \copyright
  * THIS CODE MAY NOT BE COPIED OR REPRODUCED IN ANY FORM, IN PART OR IN
  * WHOLE, WITHOUT THE EXPLICIT PERMISSION OF THE COPYRIGHT OWNER.
  *
  * \file    FileHandler.h
- * \author  (last)      Vy
- * \date    (last)      02-Jun-2023
+ * \author  (last)      Behrouz NematiPour
+ * \date    (last)      04-Apr-2024
  * \author  (original)  Behrouz NematiPour
  * \date    (original)  26-Aug-2020
  *
  */
 #pragma once
 
 // Qt
-#include <QString>
-#include <QStringList>
-#include <QJsonObject>
-#include <QJsonDocument>
-#include <QFileInfoList>
-
 #include <QDebug>
 #include <QDir>
-#include <QFile>
 
+// forward declarations
+class tst_fileHandler;
+
 class QDate;
 
 namespace Storage {
@@ -38,6 +34,8 @@
  */
 class FileHandler
 {
+    // friends
+    friend class ::tst_fileHandler;
 
 public:
     enum FileCopyError_Enums {
@@ -52,6 +50,7 @@
         eDstOpenError           ,
 
         eSrcReadError           ,
+        eSrcSymlinkError        ,
         eDstWriteError          ,
         eDstFlushError          ,
     };
@@ -61,8 +60,8 @@
 
     static bool write       (const QString &vFileName, const QString &vContent, bool vAppend = true );
     static bool read        (const QString &vFileName,       QString &vContent, bool vAppend = false);
-    static bool read        (const QString &vFileName,   QJsonObject &vContent, QJsonParseError *error = nullptr);
 
+    static int  backupFile  (const QString     &vSource);
     static int  copyFolder  (const QString     &vSource , const QString     &vDestination);
     static int  moveFolder  (const QString     &vSource , const QString     &vDestination);
     static int  removeFolder(const QString     &vFolder);
@@ -80,6 +79,9 @@
 
     static bool isPathSymLink(const QString &vFilePath);
 
+    static QString sha256sum( QString vFileName, bool *vOk = nullptr );
+
+
     /*!
      * \brief   FileHandler::copyFile
      * \details Copies a file chunk by chunk
@@ -100,7 +102,7 @@
 
         static quint8 mO_CopyPercent   = 0; quint8 mC_CopyPercent   = 0;
 
-        if ( isPathSymLink(vSource + vFileName) )                               { return eOK                 ;            } // skipping the file
+        if ( isPathSymLink(vSource + vFileName) )                               { err = eSrcSymlinkError     ; goto lErr; }
         if ( ! srcDir .exists() )                                               { err = eSrcFolderNotExist   ; goto lErr; }
         if ( ! srcFile.exists() )                                               { err = eSrcFileNotExist     ; goto lErr; }