diff --git a/LedOK/gutil/cpp.h b/LedOK/gutil/cpp.h
index 2b333c0..2a36e87 100644
--- a/LedOK/gutil/cpp.h
+++ b/LedOK/gutil/cpp.h
@@ -2,19 +2,18 @@
 #define CPP_H
 
 #include <chrono>
-#include <memory>
 #include <unordered_map>
 
-inline long long steady_milli() {
+inline int64_t steady_milli() {
     return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::steady_clock::now().time_since_epoch()).count();
 }
-inline long long system_milli() {
+inline int64_t system_milli() {
     return std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::system_clock::now().time_since_epoch()).count();
 }
-inline long long steady_micro() {
+inline int64_t steady_micro() {
     return std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::steady_clock::now().time_since_epoch()).count();
 }
-inline long long system_micro() {
+inline int64_t system_micro() {
     return std::chrono::duration_cast<std::chrono::microseconds>(std::chrono::system_clock::now().time_since_epoch()).count();
 }
 
@@ -195,7 +194,7 @@ public:
 
     LinkedMap() {}
     LinkedMap(std::initializer_list<std::pair<K, V>> pairs) : _pri{new LinkedMapPri<K, V>} {
-        for(auto pair : pairs) insert(pair.first, pair.second);
+        for(auto &pair : pairs) insert(pair.first, pair.second);
     }
     LinkedMap(std::unordered_map<K, Node*> &&map) : _pri{new LinkedMapPri<K, V>{0, 0, map}} {
         _pri->next = _pri->prev = _pri;
@@ -269,6 +268,20 @@ public:
         } else pair.first->second->value.second = v;
         return *this;
     }
+    V remove(const K& k) {
+        if(_pri==0) return V();
+        auto it = _pri->map.find(k);
+        if(it==_pri->map.end()) return V();
+        auto node = it->second;
+        _pri->map.erase(it);
+        node->prev->next = node->next;
+        node->next->prev = node->prev;
+        node->next = 0;
+        node->prev = 0;
+        auto v = node->value.second;
+        delete node;
+        return v;
+    }
     void erase(const K& k) {
         if(_pri==0) return;
         auto it = _pri->map.find(k);
diff --git a/LedOK/gutil/qcore.h b/LedOK/gutil/qcore.h
index bf21dcc..385c6c5 100644
--- a/LedOK/gutil/qcore.h
+++ b/LedOK/gutil/qcore.h
@@ -27,10 +27,10 @@ inline QString gUrlSuffix(const QString &url, int size, bool withDot = false) {
 }
 
 inline QString byteSizeStr(double size) {
-    const char *units[]{"B", "KB", "MB", "GB", "TB", "PB"};
+    const char *units[]{"B", "KB", "MB", "GB", "TB", "PB", "EB"};
     auto i = 0;
-    for(; size >= 1024 && i < 5; i++) size /= 1024;
-    return QString::number(size, 'g', 3)+" "+units[i];
+    for(; size >= 1024 && i < 7; i++) size /= 1024;
+    return (size > 99 ? QString::number(size, 'f', 0) : QString::number(size, 'g', 3))+" "+units[i];
 }
 
 inline void wait(int msec, QEventLoop::ProcessEventsFlags flags = QEventLoop::AllEvents) {
diff --git a/LedOK/gutil/qgui.cpp b/LedOK/gutil/qgui.cpp
index 9d777e1..07f1ef1 100644
--- a/LedOK/gutil/qgui.cpp
+++ b/LedOK/gutil/qgui.cpp
@@ -36,12 +36,13 @@ bool TreeWidget::eventFilter(QObject *watched, QEvent *event) {
         if(event->type()==QEvent::Resize) {
             auto eve = (QResizeEvent *) event;
             if(eve->size().width() != eve->oldSize().width()) adjSections(-1, 0);
+            return true;
         } else if(isSectionResized && event->type()==QEvent::Leave) {
             isSectionResized = false;
             auto item = headerItem();
             for(int cc=0; cc<columnCount(); cc++) if(item->data(cc, WidthRole).isValid()) item->setData(cc, WidthRole, header()->sectionSize(cc));
+            return true;
         }
-        return true;
     }
     return QTreeWidget::eventFilter(watched, event);
 }
@@ -214,12 +215,13 @@ bool TableWidget::eventFilter(QObject *watched, QEvent *event) {
         if(event->type()==QEvent::Resize) {
             auto eve = (QResizeEvent *) event;
             if(eve->size().width() != eve->oldSize().width()) adjSections(-1, 0);
+            return true;
         } else if(isSectionResized && event->type()==QEvent::Leave) {
             isSectionResized = false;
             QTableWidgetItem *item;
             for(int cc=0; cc<columnCount(); cc++) if((item = horizontalHeaderItem(cc)) && item->data(WidthRole).isValid()) item->setData(WidthRole, horizontalHeader()->sectionSize(cc));
+            return true;
         }
-        return true;
     }
     return QTableWidget::eventFilter(watched, event);
 }
diff --git a/LedOK/gutil/qgui.h b/LedOK/gutil/qgui.h
index 62e8032..30e72ae 100644
--- a/LedOK/gutil/qgui.h
+++ b/LedOK/gutil/qgui.h
@@ -147,9 +147,9 @@ public:
     Grid(QSplitter *splitter) : QGridLayout(new QWidget) {
         splitter->addWidget(parentWidget());
     };
-    QLabel *addLabel(const QString& text) {
+    QLabel *addLabel(const QString& text, int row, int column, Qt::Alignment align = Qt::Alignment()) {
         auto lb = new QLabel(text);
-        addWidget(lb);
+        addWidget(lb, row, column, align);
         return lb;
     }
 };
@@ -274,6 +274,7 @@ public:
     int sizeHintForColumn(int column) const override {
         return QTreeWidget::sizeHintForColumn(column);
     }
+    bool adjSections(int index, int size);
 signals:
     void updGeos();
 protected:
@@ -285,7 +286,6 @@ protected:
     void rowsInserted(const QModelIndex &parent, int start, int end) override;
     void drawRow(QPainter *painter, const QStyleOptionViewItem &options, const QModelIndex &index) const override;
     void onSectionResized(int logicalIndex, int oldSize, int newSize);
-    bool adjSections(int index, int size);
     bool noStretch = true;
     bool noMargin = true;
     bool isSectionResized = false;
diff --git a/LedOK/gutil/qjson.cpp b/LedOK/gutil/qjson.cpp
index ed6e8c4..574a13e 100644
--- a/LedOK/gutil/qjson.cpp
+++ b/LedOK/gutil/qjson.cpp
@@ -16,10 +16,10 @@ JValue JParser::readValue() {
             while(ch==',');
             if(ch=='}') return obj;
             QString key;
-            if(ch == '"') key = readStr();
+            if(ch=='"') key = readStr();
             else if(ch!='n' || readOne()!='u' || readOne()!='l' || readOne()!='l') throw QString("Unexpected char ")+(char)ch+" (code "+QString::number(ch)+"): was expecting double-quote to start field name or null";
             skipSpace();
-            if(ch != ':') throw QString("Unexpected char ")+(char)ch+" (code "+QString::number(ch)+"): was expecting a colon to separate field name and value";
+            if(ch!=':') throw QString("Unexpected char ")+(char)ch+" (code "+QString::number(ch)+"): was expecting a colon to separate field name and value";
             skipSpace();
             obj.insert(key, readValue());
             skipSpace(); //ch有两种可能
diff --git a/LedOK/gutil/qjson.h b/LedOK/gutil/qjson.h
index be89662..08d49d8 100644
--- a/LedOK/gutil/qjson.h
+++ b/LedOK/gutil/qjson.h
@@ -5,6 +5,7 @@
 #include "QtCore/qhashfunctions.h"
 #include <QDataStream>
 #include <QTextStream>
+
 class JValue;
 using JObj = LinkedMap<QString, JValue>;
 using JArray = Vector<JValue>;
@@ -13,7 +14,7 @@ QDebug operator<<(QDebug debug, const JValue &val);
 
 class JValue {
 public:
-    long long data = 0;
+    int64_t data = 0;
     enum Type {
         Null, Long, Ulong, Double, Bool, Obj, Array, Str
     };
@@ -119,10 +120,17 @@ public:
     const JValue operator[](const QString &key) const {
         return type==Obj ? (*(const JObj*) &data)[key] : JValue();
     }
-    const JValue operator[](int i) const {
+    const JValue operator[](uint64_t i) const {
         return type==Array ? (*(const JArray*) &data)[i] : JValue();
     }
 
+    JValue &ref(const QString &key) {
+        return (*(JObj*) &data)[key];
+    }
+    JValue &ref(uint64_t i) {
+        return (*(JArray*) &data)[i];
+    }
+
     JArray::iterator begin() const noexcept {
         return type==Array ? ((const JArray*) &data)->begin() : JArray::iterator();
     }
@@ -167,6 +175,7 @@ private:
 class JParser {
 public:
     JParser(QDataStream &in) : in(in) {}
+
     JValue read() {
         in >> ch;
         if(ch==0) throw "Unexpected end-of-input";
@@ -182,6 +191,7 @@ protected:
         in >> ch;
         return ch;
     }
+
     QDataStream &in;
     unsigned char ch{0}, bk{0};
 };