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galaxyproject · Nov 4, 2024 · 7197e5f · 7197e5f
1 parent 27a6a01
commit 7197e5f
Showing 1 changed file with 4 additions and 1 deletion.
diff --git a/lib/galaxy/datatypes/xml.py b/lib/galaxy/datatypes/xml.py
@@ -303,4 +303,7 @@ def sniff_prefix(self, file_prefix: FilePrefix) -> bool:
         >>> Vtu().sniff( fname )
         False
         """
-        return self._has_root_element_in_prefix(file_prefix, "VTKFile") and b'type="UnstructuredGrid"' in file_prefix.string_io.read(100)
+        if not self._has_root_element_in_prefix(file_prefix, "VTKFile"):
+            return False
+        header = file_prefix.bytes[:100]
+        return b'type="UnstructuredGrid"' in header