Store ExternalCommand output in QByteArray.

This makes it possible to run dd with ExternalCommand.

README.md

@@ -82,7 +82,7 @@ If you only want devices from the loaded backend you can call
     QList<Device*> devices = backend->scanDevices( excludeReadOnly );
 ```
 
-where bool option `excludeReadOnly` specifies whether to exclude
+where `bool` option `excludeReadOnly` specifies whether to exclude
 read only devices.
 
 #### KPMcore device scanner

src/util/externalcommand.cpp

@@ -116,7 +116,7 @@ bool ExternalCommand::run(int timeout)
 
 void ExternalCommand::onReadOutput()
 {
-    const QString s = QString::fromUtf8(readAllStandardOutput());
+    const QByteArray s = readAllStandardOutput();
 
     if(m_Output.length() > 10*1024*1024) { // prevent memory overflow for badly corrupted file systems
         if (report())
@@ -127,7 +127,7 @@ void ExternalCommand::onReadOutput()
     m_Output += s;
 
     if (report())
-        *report() << s;
+        *report() << QString::fromLocal8Bit(s);
 }
 
 void ExternalCommand::onFinished(int exitCode, QProcess::ExitStatus exitStatus)

src/util/externalcommand.h

@@ -61,7 +61,11 @@ public:
         return m_ExitCode;    /**< @return the exit code */
     }
 
-    const QString& output() const {
+    const QString output() const {
+        return QString::fromLocal8Bit(m_Output);    /**< @return the command output */
+    }
+
+    const QByteArray& rawOutput() const {
         return m_Output;    /**< @return the command output */
     }
 
@@ -83,7 +87,7 @@ private:
     QString m_Command;
     QStringList m_Args;
     int m_ExitCode;
-    QString m_Output;
+    QByteArray m_Output;
 };
 
 #endif