Code to get font names from sfnt container object

src/calibre/utils/fonts/sfnt/container.py

@@ -106,6 +106,13 @@ class Sfnt(object):
             ans[tag] = len(self[tag])
         return ans
 
+    def get_all_font_names(self):
+        name_table = self.get(b'name')
+        if name_table is None:
+            return {}
+        from calibre.utils.fonts.metadata import get_font_names2
+        return get_font_names2(name_table.raw, raw_is_table=True)
+
     def __call__(self, stream=None):
         stream = BytesIO() if stream is None else stream