diff --git a/sources/FastSerializer.cpp b/sources/FastSerializer.cpp
index 28610680..5cdfd0da 100644
--- a/sources/FastSerializer.cpp
+++ b/sources/FastSerializer.cpp
@@ -19,10 +19,10 @@ static_assert(
     sizeof(bool) == 1,
     "Unsupported platform, sizeof(bool) should be 1!");
 
-FastSerializer::FastSerializer()
+FastSerializer::FastSerializer(int size)
     : index_(0)
 {
-    data_.resize(DEFAULT_SIZE);
+    data_.resize(size);
 }
 
 FastSerializer::~FastSerializer()
diff --git a/sources/FastSerializer.h b/sources/FastSerializer.h
index 8ce8e899..be7ec8b2 100644
--- a/sources/FastSerializer.h
+++ b/sources/FastSerializer.h
@@ -15,7 +15,7 @@ class FastSerializer
         const T& value);
 public:
     static const int DEFAULT_SIZE = 32 * 1024 * 1024;
-    FastSerializer();
+    FastSerializer(int size = DEFAULT_SIZE);
     ~FastSerializer();
 
     void ResetIndex()
diff --git a/sources/MapEditor.cpp b/sources/MapEditor.cpp
index 4471d70f..b3163a62 100644
--- a/sources/MapEditor.cpp
+++ b/sources/MapEditor.cpp
@@ -288,13 +288,21 @@ void MapEditor::LoadMapgen(const QString& name)
 void MapEditor::fix_borders(int *posx, int *posy)
 {
     if (*posx < 0)
+    {
         *posx = 0;
+    }
     if (*posx >= static_cast<int>(editor_map_.size()))
+    {
         *posx = static_cast<int>(editor_map_.size()) - 1;
+    }
     if (*posy < 0)
+    {
         *posy = 0;
+    }
     if (*posy >= static_cast<int>(editor_map_[0].size()))
+    {
         *posy = static_cast<int>(editor_map_[0].size()) - 1;
+    }
 }
 
 void MapEditor::SetPointer(int posx, int posy)
diff --git a/sources/MapEditor.h b/sources/MapEditor.h
index 096e3070..2744cdc5 100644
--- a/sources/MapEditor.h
+++ b/sources/MapEditor.h
@@ -13,6 +13,8 @@
 #include <QKeyEvent>
 #include <QVector>
 
+typedef std::map<QString, QByteArray> MapgenVariablesType;
+
 class MapEditor: public QObject
 {
     Q_OBJECT
@@ -23,7 +25,7 @@ class MapEditor: public QObject
 
         QString item_type;
 
-        std::map<QString, QString> variables;
+        MapgenVariablesType variables;
 
         QGraphicsPixmapItem* pixmap_item;
     };
diff --git a/sources/core/ObjectFactory.cpp b/sources/core/ObjectFactory.cpp
index 921391ad..7dd4719d 100644
--- a/sources/core/ObjectFactory.cpp
+++ b/sources/core/ObjectFactory.cpp
@@ -11,6 +11,8 @@
 #include "net/NetworkMessagesTypes.h"
 #include "AutogenMetadata.h"
 
+#include "MapEditor.h"
+
 ObjectFactory::ObjectFactory(IGame* game)
 {
     objects_table_.resize(100);
@@ -94,7 +96,7 @@ void ObjectFactory::SaveMapHeader(FastSerializer& savefile)
     savefile << game_->GetMap().GetDepth();
 
     // Save player table
-    savefile << players_table_.size();
+    savefile << static_cast<quint32>(players_table_.size());
     for (auto it = players_table_.begin(); it != players_table_.end(); ++it)
     {
         savefile << it->first;
@@ -264,7 +266,7 @@ void ObjectFactory::LoadFromMapGen(const QString& name)
         }
         //qDebug() << "Success!";
 
-        std::map<QString, QByteArray> variables;
+        MapgenVariablesType variables;
         WrapReadMessage(ss, variables);
 
         for (auto it = variables.begin(); it != variables.end(); ++it)
diff --git a/sources/core/StreamWrapper.h b/sources/core/StreamWrapper.h
index a91d868c..0d75b968 100644
--- a/sources/core/StreamWrapper.h
+++ b/sources/core/StreamWrapper.h
@@ -21,7 +21,7 @@ inline FastSerializer& WrapWriteMessage(
         FastSerializer& file,
         std::map<KeyType, ValueType>& to_write)
 {
-    file << to_write.size();
+    file << static_cast<quint32>(to_write.size());
     for (auto it = to_write.begin(); it != to_write.end(); ++it)
     {
         WrapWriteMessage(file, it->first);
diff --git a/sources/core/objects/Projectiles.cpp b/sources/core/objects/Projectiles.cpp
index dc7a3170..ef3cbd6d 100644
--- a/sources/core/objects/Projectiles.cpp
+++ b/sources/core/objects/Projectiles.cpp
@@ -3,7 +3,7 @@
 
 FastSerializer& operator<<(FastSerializer& file, const std::vector<Dir>& s)
 {
-    file << s.size();
+    file << static_cast<quint32>(s.size());
     for (auto it : s)
     {
         file << it;
diff --git a/sources/core/objects/Tile.h b/sources/core/objects/Tile.h
index 8245d30d..82ad8d2c 100644
--- a/sources/core/objects/Tile.h
+++ b/sources/core/objects/Tile.h
@@ -10,7 +10,7 @@
 template<class T>
 FastSerializer& operator<<(FastSerializer& file, const std::vector<IdPtr<T>>& content)
 {
-    file << content.size();
+    file << static_cast<quint32>(content.size());
     for (auto it = content.begin(); it != content.end(); ++it)
     {
         file << it->Id();
diff --git a/sources/representation/ViewInfo.cpp b/sources/representation/ViewInfo.cpp
index aced477a..410aa8e4 100644
--- a/sources/representation/ViewInfo.cpp
+++ b/sources/representation/ViewInfo.cpp
@@ -6,13 +6,13 @@ FastSerializer& operator<<(FastSerializer& file, ViewInfo& view_info)
 {
     WrapWriteMessage(file, view_info.base_frameset_);
 
-    file << view_info.underlays_.size();
+    file << static_cast<quint32>(view_info.underlays_.size());
     for (auto it = view_info.underlays_.begin(); it != view_info.underlays_.end(); ++it)
     {
             WrapWriteMessage(file, *it);
     }
 
-    file << view_info.overlays_.size();
+    file << static_cast<quint32>(view_info.overlays_.size());
     for (auto it = view_info.overlays_.begin(); it != view_info.overlays_.end(); ++it)
     {
             WrapWriteMessage(file, *it);
diff --git a/sources/representation/qt/mapeditorform.cpp b/sources/representation/qt/mapeditorform.cpp
index 2ea6f6b7..a782ee38 100644
--- a/sources/representation/qt/mapeditorform.cpp
+++ b/sources/representation/qt/mapeditorform.cpp
@@ -347,20 +347,21 @@ void MapEditorForm::on_listWidgetVariables_itemSelectionChanged()
         return;
     }
 
-    QString& variable_value = ee->variables[ui->listWidgetVariables->currentItem()->text()];
+    QByteArray& variable_value = ee->variables[ui->listWidgetVariables->currentItem()->text()];
 
-    ui->lineEditRaw->setText(variable_value);
+    ui->lineEditRaw->setText(variable_value.toHex());
 
-    std::stringstream ss;
-    ss << variable_value.toStdString();
+    // TODO: As string
+
+    // FastDeserializer deserializer(variable_value.data(), variable_value.size());
 
-    QString parsed_value;
-    if (WrapReadMessage(ss, parsed_value).fail())
+    /*QString parsed_value;
+    if (WrapReadMessage(deserializer, parsed_value))
     {
         parsed_value = "PARSING_ERROR";
     }
 
-    ui->lineEditAsString->setText(parsed_value);
+    ui->lineEditAsString->setText(parsed_value);*/
 }
 
 void MapEditorForm::on_lineEditRaw_returnPressed()
@@ -378,9 +379,9 @@ void MapEditorForm::on_lineEditRaw_returnPressed()
 
 
 
-    QString& variable_value = ee->variables[ui->listWidgetVariables->currentItem()->text()];
+    QByteArray& variable_value = ee->variables[ui->listWidgetVariables->currentItem()->text()];
 
-    variable_value = ui->lineEditRaw->text();
+    variable_value = QByteArray::fromHex(ui->lineEditRaw->text().toUtf8());
 
     on_listWidgetVariables_itemSelectionChanged();
     UpdateVariablesColor(*ee);
@@ -401,7 +402,8 @@ void MapEditorForm::on_lineEditAsString_returnPressed()
         return;
     }
 
-    QString& variable_value = ee->variables[ui->listWidgetVariables->currentItem()->text()];
+    // TODO: reimplement this
+    /*QString& variable_value = ee->variables[ui->listWidgetVariables->currentItem()->text()];
 
     std::stringstream ss;
     QString loc = ui->lineEditAsString->text();
@@ -410,7 +412,7 @@ void MapEditorForm::on_lineEditAsString_returnPressed()
     variable_value = QString::fromStdString(ss.str());
 
     on_listWidgetVariables_itemSelectionChanged();
-    UpdateVariablesColor(*ee);
+    UpdateVariablesColor(*ee);*/
 }
 
 void MapEditorForm::on_listWidgetTurf_clicked(const QModelIndex&index)
diff --git a/sources/representation/qt/mapeditorform.h b/sources/representation/qt/mapeditorform.h
index 1efa1aa5..0fb28c12 100644
--- a/sources/representation/qt/mapeditorform.h
+++ b/sources/representation/qt/mapeditorform.h
@@ -8,6 +8,7 @@
 #include <vector>
 
 #include "MapEditor.h"
+#include "FastSerializer.h"
 
 namespace Ui {
 class MapEditorForm;
@@ -82,6 +83,8 @@ private slots:
     std::vector<QString> types_;
     std::vector<QString> turf_types_;
 
+    FastSerializer serializer_;
+
     Ui::MapEditorForm *ui;
 };