[ADD] enforce that gzipped nifti files have the suffix: ".nii.gz"

src/dataHandler/WLoaderManager.cpp

@@ -44,6 +44,11 @@ void WLoaderManager::load( std::string fileName, boost::shared_ptr< WDataHandler
 
     if( suffix == ".nii" || suffix == ".gz" )
     {
+        // enforce that a gzipped file is has also a "nii" sub suffix
+        boost::filesystem::path p( fileName );
+        p.replace_extension( "" );
+        suffix = getSuffix( p.string() );
+        assert( suffix == ".nii" && "currently only nii files may be gzipped" );
         WLoaderNIfTI niiLoader( fileName, dataHandler );
         boost::thread loaderThread( niiLoader );
     }