2 files changed, 3 insertions, 5 deletions
diff --git a/core/qthelper.cpp b/core/qthelper.cpp
index e7bf7dcf4..0029ca13a 100644
--- a/core/qthelper.cpp
+++ b/core/qthelper.cpp
@@ -1149,15 +1149,12 @@ QByteArray hashFile(const QString filename)
 	}
 }
 
-void learnHash(struct picture *picture, QByteArray hash)
+void learnHash(const struct picture *picture, QByteArray hash)
 {
 	if (hash.isNull())
 		return;
-	if (picture->hash)
-		free(picture->hash);
 	QMutexLocker locker(&hashOfMutex);
 	hashOf[QString(picture->filename)] = hash;
-	picture->hash = strdup(hash.toHex());
 }
 
 static bool haveHash(const QString &filename)
diff --git a/core/qthelper.h b/core/qthelper.h
index f84c74d2b..a71960c86 100644
--- a/core/qthelper.h
+++ b/core/qthelper.h
@@ -37,9 +37,10 @@ QByteArray hashFile(const QString filename);
 void learnImages(const QDir dir, int max_recursions);
 void add_hash(const QString filename, QByteArray hash);
 void hashPicture(struct picture *picture);
+extern "C" char *hashstring(const char *filename);
 QString localFilePath(const QString originalFilename);
 QString fileFromHash(const char *hash);
-void learnHash(struct picture *picture, QByteArray hash);
+void learnHash(const struct picture *picture, QByteArray hash);
 weight_t string_to_weight(const char *str);
 depth_t string_to_depth(const char *str);
 pressure_t string_to_pressure(const char *str);