Index: sources/storage/FileHandler.h
===================================================================
diff -u -r14c541d2b780b0a244bc84860aa565cf8dd7fe4b -ra3030123e885fb9f22dea5839c4e988896a257e4
--- sources/storage/FileHandler.h	(.../FileHandler.h)	(revision 14c541d2b780b0a244bc84860aa565cf8dd7fe4b)
+++ sources/storage/FileHandler.h	(.../FileHandler.h)	(revision a3030123e885fb9f22dea5839c4e988896a257e4)
@@ -16,8 +16,11 @@
 
 // Qt
 #include <QString>
+#include <QStringList>
 #include <QJsonObject>
 #include <QJsonDocument>
+#include <QFileInfoList>
+
 class QDate;
 
 namespace Storage {
@@ -36,11 +39,15 @@
 public:
     static bool write      (const QString &vFileName, const QString &vContent, bool vAppend = true);
     static bool read       (const QString &vFileName,       QString &vContent);
-    static bool readJSON   (const QString &vFileName,   QJsonObject &vContent);
+    static bool read       (const QString &vFileName,   QJsonObject &vContent, QJsonParseError *error = nullptr);
 
     static int  copyFolder (const QString     &vSource , const QString     &vDestination);
     static int  removeFiles(const QStringList &vFolders, const QStringList &vNameFilter, const QDate &vDateOlderThan);
     static bool makeFolder (const QString     &vFolder);
     static bool isMounted  (const QString     &vPath, bool *vIsReadOnly = nullptr);
+
+    static QFileInfoList find(const QString &vPath, QStringList vNameFilter, quint8 vRetainPercent);
+    static QFileInfoList find(const QString &vPath, QStringList vNameFilter);
+    static quint64  totalSize(const QFileInfoList &vFileInfoList);
 };
 }