2 files changed, 8 insertions, 8 deletions
diff --git a/core/qthelper.cpp b/core/qthelper.cpp
index e03f86739..cacee776b 100644
--- a/core/qthelper.cpp
+++ b/core/qthelper.cpp
@@ -1127,7 +1127,7 @@ void write_hashes()
 	}
 }
 
-void add_hash(const QString filename, QByteArray hash)
+void add_hash(const QString &filename, const QByteArray &hash)
 {
 	if (hash.isEmpty())
 		return;
@@ -1136,7 +1136,7 @@ void add_hash(const QString filename, QByteArray hash)
 	localFilenameOf[hash] = filename;
 }
 
-QByteArray hashFile(const QString filename)
+QByteArray hashFile(const QString &filename)
 {
 	QCryptographicHash hash(QCryptographicHash::Sha1);
 	QFile imagefile(filename);
@@ -1164,7 +1164,7 @@ static bool haveHash(const QString &filename)
 	return hashOf.contains(filename);
 }
 
-QString localFilePath(const QString originalFilename)
+QString localFilePath(const QString &originalFilename)
 {
 	QMutexLocker locker(&hashOfMutex);
 
@@ -1486,7 +1486,7 @@ QByteArray getCurrentAppState()
 	return currentApplicationState;
 }
 
-void setCurrentAppState(QByteArray state)
+void setCurrentAppState(const QByteArray &state)
 {
 	currentApplicationState = state;
 }
diff --git a/core/qthelper.h b/core/qthelper.h
index 948ca234d..516990005 100644
--- a/core/qthelper.h
+++ b/core/qthelper.h
@@ -33,12 +33,12 @@ QString get_divepoint_gas_string(struct dive *d, const divedatapoint& dp);
 void read_hashes();
 void write_hashes();
 void updateHash(struct picture *picture);
-QByteArray hashFile(const QString filename);
+QByteArray hashFile(const QString &filename);
 void learnImages(const QDir dir, int max_recursions);
-void add_hash(const QString filename, QByteArray hash);
+void add_hash(const QString &filename, const QByteArray &hash);
 void hashPicture(struct picture *picture);
 extern "C" char *hashstring(const char *filename);
-QString localFilePath(const QString originalFilename);
+QString localFilePath(const QString &originalFilename);
 QString fileFromHash(const char *hash);
 void learnHash(const QString &originalName, const QString &localName, const QByteArray &hash);
 weight_t string_to_weight(const char *str);
@@ -49,7 +49,7 @@ fraction_t string_to_fraction(const char *str);
 int getCloudURL(QString &filename);
 bool parseGpsText(const QString &gps_text, double *latitude, double *longitude);
 QByteArray getCurrentAppState();
-void setCurrentAppState(QByteArray state);
+void setCurrentAppState(const QByteArray &state);
 void init_proxy();
 QString getUUID();
 QStringList imageExtensionFilters();