tolerate duplicate enum values, keep first name that was seen

Author: Valentin Obst

volatility3/framework/objects/__init__.py

@@ -593,17 +593,19 @@ def _generate_inverse_choices(cls, choices: Dict[str, int]) -> Dict[int, str]:
         inverse_choices: Dict[int, str] = {}
         for k, v in choices.items():
             if v in inverse_choices:
-                # Technically this shouldn't be a problem, but since we inverse cache
-                # and can't map one value to two possibilities we throw an exception during build
-                # We can remove/work around this if it proves a common issue
-                raise ValueError(
-                    f"Enumeration value {v} duplicated as {k} and {inverse_choices[v]}"
+                vollog.log(
+                    constants.LOGLEVEL_VVV,
+                    f"Enumeration value {v} duplicated as {k}. Keeping name {inverse_choices[v]}",
                 )
+                continue
             inverse_choices[v] = k
         return inverse_choices
 
     def lookup(self, value: int = None) -> str:
-        """Looks up an individual value and returns the associated name."""
+        """Looks up an individual value and returns the associated name.
+
+        If multiple identifiers map to the same value, the first matching identifier will be returned
+        """
         if value is None:
             return self.lookup(self)
         if value in self._inverse_choices:
@@ -640,7 +642,10 @@ class VolTemplateProxy(interfaces.objects.ObjectInterface.VolTemplateProxy):
 
         @classmethod
         def lookup(cls, template: interfaces.objects.Template, value: int) -> str:
-            """Looks up an individual value and returns the associated name."""
+            """Looks up an individual value and returns the associated name.
+
+            If multiple identifiers map to the same value, the first matching identifier will be returned
+            """
             _inverse_choices = Enumeration._generate_inverse_choices(
                 template.vol["choices"]
             )