Add simple check for password protected pdf's (poppler only)

common/http_worker.h

@@ -0,0 +1,32 @@
+#ifndef __HTTP_WORKER_H
+#define __HTTP_WORKER_H
+
+#include <QWidget>
+#include <QByteArray>
+#include <QThread>
+#include <QUrl>
+#include "yacreader_global.h"
+
+ class HttpWorker : public QThread
+ {
+		 Q_OBJECT
+	public:
+		HttpWorker(const QString & urlString);
+	public slots:
+		void get();
+		QByteArray getResult();
+		bool wasValid();
+		bool wasTimeout();
+	private:
+		void run();
+		QUrl url;
+		int httpGetId;
+		QByteArray result;
+		bool _error;
+		bool _timeout;
+	signals:
+		void dataReady(const QByteArray &);
+		void timeout();
+ };
+
+#endif