prevent json file read error

RedPandaIDE/autolinkmanager.cpp

@@ -81,7 +81,9 @@ void AutolinkManager::load()
 #endif
     }
     if (file.open(QFile::ReadOnly)) {
-        QByteArray content = file.readAll();
+        QByteArray content = file.readAll().trimmed();
+        if (content.isEmpty())
+            return;
         QJsonDocument doc(QJsonDocument::fromJson(content));
         fromJson(doc.array());
         file.close();

RedPandaIDE/codesnippetsmanager.cpp

@@ -82,7 +82,9 @@ void CodeSnippetsManager::loadSnippets()
         return;
     }
 
-    QByteArray json = file.readAll();
+    QByteArray json = file.readAll().trimmed();
+    if (json.isEmpty())
+        return;
     QJsonParseError error;
     QJsonDocument doc = QJsonDocument::fromJson(json,&error);
     if (error.error != QJsonParseError::NoError) {

RedPandaIDE/colorscheme.cpp

@@ -68,7 +68,9 @@ PColorScheme ColorScheme::load(const QString &filename)
         qDebug()<<QObject::tr("Can't open file '%1' for read").arg(file.fileName());
         return PColorScheme();
     }
-    QByteArray content = file.readAll();
+    QByteArray content = file.readAll().trimmed();
+    if (content.isEmpty())
+        return PColorScheme();
     QJsonParseError error;
     QJsonDocument doc = QJsonDocument::fromJson(content,&error);
     if (error.error!=QJsonParseError::NoError) {

RedPandaIDE/iconsmanager.cpp

@@ -381,7 +381,9 @@ QList<PIconSet> IconsManager::listIconSets()
             pSet->displayName = pSet->name;
             QFile infoFile(includeTrailingPathDelimiter(fileInfo.absoluteFilePath())+"info.json");
             if (infoFile.exists() && infoFile.open(QFile::ReadOnly)) {
-                QByteArray content = infoFile.readAll();
+                QByteArray content = infoFile.readAll().trimmed();
+                if (content.isEmpty())
+                    return result;
                 QJsonParseError error;
                 QJsonDocument doc(QJsonDocument::fromJson(content,&error));
                 if (error.error  == QJsonParseError::NoError) {

RedPandaIDE/project.cpp

@@ -1928,7 +1928,9 @@ QHash<QString, PProjectEditorLayout> Project::loadLayout()
     QFile file(jsonFilename);
     if (!file.open(QIODevice::ReadOnly))
         return layouts;
-    QByteArray content = file.readAll();
+    QByteArray content = file.readAll().trimmed();
+    if (content.isEmpty())
+        return layouts;
     QJsonParseError parseError;
     QJsonDocument doc(QJsonDocument::fromJson(content,&parseError));
     file.close();

RedPandaIDE/shortcutmanager.cpp

@@ -46,7 +46,9 @@ void ShortcutManager::load()
         return;
     }
 
-    QByteArray json = file.readAll();
+    QByteArray json = file.readAll().trimmed();
+    if (json.isEmpty())
+        return;
     QJsonParseError error;
     QJsonDocument doc = QJsonDocument::fromJson(json,&error);
     if (error.error != QJsonParseError::NoError) {

RedPandaIDE/symbolusagemanager.cpp

@@ -42,7 +42,9 @@ void SymbolUsageManager::load()
                               tr("Can't open symbol usage file '%1' for read.")
                               .arg(filename));
     }
-    QByteArray contents = file.readAll();
+    QByteArray contents = file.readAll().trimmed();
+    if (contents.isEmpty())
+        return;
     QJsonParseError error;
     QJsonDocument doc = QJsonDocument::fromJson(contents,&error);
     if (error.error != QJsonParseError::NoError) {

RedPandaIDE/thememanager.cpp

@@ -204,7 +204,9 @@ AppTheme::AppTheme(const QString &filename, ThemeType type, QObject *parent):QOb
                         .arg(filename));
     }
     if (file.open(QFile::ReadOnly)) {
-        QByteArray content = file.readAll();
+        QByteArray content = file.readAll().trimmed();
+        if (content.isEmpty())
+            return;
         QJsonObject obj;
 
         switch (type) {

RedPandaIDE/toolsmanager.cpp

@@ -69,7 +69,9 @@ void ToolsManager::load()
         return;
     }
 
-    QByteArray json = file.readAll();
+    QByteArray json = file.readAll().trimmed();
+    if (json.isEmpty())
+        return;
     QJsonParseError error;
     QJsonDocument doc = QJsonDocument::fromJson(json,&error);
     if (error.error != QJsonParseError::NoError) {

RedPandaIDE/visithistorymanager.cpp

@@ -96,8 +96,11 @@ PVisitHistory VisitHistoryManager::doLoad(const QString &filename, qint64 criter
     QFile file(filename);
     if (!file.open(QFile::ReadOnly))
         return pHistory;
+    QByteArray content = file.readAll().trimmed();
+    if (content.isEmpty())
+        return pHistory;
     QJsonParseError error;
-    QJsonDocument doc=QJsonDocument::fromJson(file.readAll(),&error);
+    QJsonDocument doc=QJsonDocument::fromJson(content, &error);
     if (error.error!=QJsonParseError::NoError)
         return pHistory;
     bool ok;

RedPandaIDE/widgets/ojproblemsetmodel.cpp

@@ -174,7 +174,9 @@ void OJProblemSetModel::loadFromFile(const QString &fileName, int& currentIndex)
 {
     QFile file(fileName);
     if (file.open(QFile::ReadOnly)) {
-        QByteArray content = file.readAll();
+        QByteArray content = file.readAll().trimmed();
+        if (content.isEmpty())
+            return;
         QJsonParseError error;
         QJsonDocument doc(QJsonDocument::fromJson(content,&error));
         if (error.error!=QJsonParseError::NoError) {