Qt: Fix DataPrinter hex conversions.

Add casts so that we call the unsigned version of QString::arg. We
aren't modifying the byte array and want to avoid deep copies so
constify it.

Change-Id: I2dcdeeab87bb0f810ffd4d36d41d1e47256d487e
Reviewed-on: https://code.wireshark.org/review/24901
Reviewed-by: Gerald Combs <gerald@wireshark.org>
Petri-Dish: Gerald Combs <gerald@wireshark.org>
Tested-by: Petri Dish Buildbot
Reviewed-by: Michael Mann <mmann78@netscape.net>

ui/qt/utils/data_printer.cpp

@@ -25,7 +25,7 @@ DataPrinter::DataPrinter(QObject * parent)
 
 void DataPrinter::toClipboard(DataPrinter::DumpType type, IDataPrintable * printable)
 {
-    QByteArray printData = printable->printableData();
+    const QByteArray printData = printable->printableData();
 
     QString clipboard_text;
 
@@ -40,7 +40,7 @@ void DataPrinter::toClipboard(DataPrinter::DumpType type, IDataPrintable * print
         break;
     case DP_HexStream:
         for (int i = 0; i < printData.length(); i++)
-            clipboard_text += QString("%1").arg(printData[i], 2, 16, QChar('0'));
+            clipboard_text += QString("%1").arg((uint8_t) printData[i], 2, 16, QChar('0'));
         break;
     case DP_EscapedString:
         // Beginning quote
@@ -54,7 +54,7 @@ void DataPrinter::toClipboard(DataPrinter::DumpType type, IDataPrintable * print
             if (i % 16 == 0 && i != 0 && i != printData.length() - 1) {
                 clipboard_text += QString("\" \\\n\"");
             }
-            clipboard_text += QString("\\x%1").arg(printData[i], 2, 16, QChar('0'));
+            clipboard_text += QString("\\x%1").arg((uint8_t) printData[i], 2, 16, QChar('0'));
         }
         // End quote
         clipboard_text += QString("\"\n");
@@ -77,7 +77,7 @@ void DataPrinter::toClipboard(DataPrinter::DumpType type, IDataPrintable * print
     }
 }
 
-void DataPrinter::binaryDump(QByteArray printData)
+void DataPrinter::binaryDump(const QByteArray printData)
 {
     if (!printData.isEmpty()) {
         QMimeData *mime_data = new QMimeData;
@@ -110,7 +110,7 @@ int DataPrinter::hexChars()
     return (row_width * chars_per_byte) + ((row_width - 1) / separatorInterval());
 }
 
-QString DataPrinter::hexTextDump(QByteArray printData, bool showText)
+QString DataPrinter::hexTextDump(const QByteArray printData, bool showText)
 {
     QString clipboard_text;
 

ui/qt/utils/data_printer.h

@@ -23,7 +23,7 @@ class IDataPrintable
 public:
     virtual ~IDataPrintable() {}
 
-    virtual QByteArray printableData() = 0;
+    virtual const QByteArray printableData() = 0;
 };
 
 class DataPrinter : public QObject
@@ -51,8 +51,8 @@ public:
     static int hexChars();
 
 private:
-    QString hexTextDump(QByteArray printData, bool append_text);
-    void binaryDump(QByteArray printData);
+    QString hexTextDump(const QByteArray printData, bool append_text);
+    void binaryDump(const QByteArray printData);
 
     int byteLineLength_;
 };

ui/qt/utils/field_information.cpp

@@ -174,7 +174,7 @@ FieldInformation::Position FieldInformation::appendix() const
     return pos;
 }
 
-QByteArray FieldInformation::printableData()
+const QByteArray FieldInformation::printableData()
 {
     QByteArray data;
 

ui/qt/utils/field_information.h

@@ -61,7 +61,7 @@ public:
     const QString moduleName();
     QString url();
 
-    QByteArray printableData();
+    const QByteArray printableData();
 
 private:
 

ui/qt/utils/frame_information.cpp

@@ -96,7 +96,7 @@ int FrameInformation::frameNum() const
     return fi_->num;
 }
 
-QByteArray FrameInformation::printableData()
+const QByteArray FrameInformation::printableData()
 {
     QByteArray data;
 

ui/qt/utils/frame_information.h

@@ -51,7 +51,7 @@ public:
     frame_data * frameData() const;
     int frameNum() const;
 
-    QByteArray printableData();
+    const QByteArray printableData();
 
 private: