Allow saving unknown files with raw data

When a file has no custom encoder, the decode path returns {'raw': ...}
but the encode path raised NotImplementedError. Add a fallback in all
encoder methods to return the raw data directly when present in the
abstract_data dict, allowing unknown files to round-trip.

pySim/filesystem.py

@@ -863,6 +863,8 @@ class TransparentEF(CardEF):
             t = self._tlv() if inspect.isclass(self._tlv) else self._tlv
             t.from_dict(abstract_data)
             return t.to_tlv()
+        if 'raw' in abstract_data:
+            return h2b(abstract_data['raw'])
         raise NotImplementedError(
             "%s encoder not yet implemented. Patches welcome." % self)
 
@@ -892,6 +894,8 @@ class TransparentEF(CardEF):
             t = self._tlv() if inspect.isclass(self._tlv) else self._tlv
             t.from_dict(abstract_data)
             return b2h(t.to_tlv())
+        if 'raw' in abstract_data:
+            return abstract_data['raw']
         raise NotImplementedError(
             "%s encoder not yet implemented. Patches welcome." % self)
 
@@ -1166,6 +1170,8 @@ class LinFixedEF(CardEF):
             t = self._tlv() if inspect.isclass(self._tlv) else self._tlv
             t.from_dict(abstract_data)
             return b2h(t.to_tlv())
+        if 'raw' in abstract_data:
+            return abstract_data['raw']
         raise NotImplementedError(
             "%s encoder not yet implemented. Patches welcome." % self)
 
@@ -1195,6 +1201,8 @@ class LinFixedEF(CardEF):
             t = self._tlv() if inspect.isclass(self._tlv) else self._tlv
             t.from_dict(abstract_data)
             return t.to_tlv()
+        if 'raw' in abstract_data:
+            return h2b(abstract_data['raw'])
         raise NotImplementedError(
             "%s encoder not yet implemented. Patches welcome." % self)
 
@@ -1386,6 +1394,8 @@ class TransRecEF(TransparentEF):
             t = self._tlv() if inspect.isclass(self._tlv) else self._tlv
             t.from_dict(abstract_data)
             return b2h(t.to_tlv())
+        if 'raw' in abstract_data:
+            return abstract_data['raw']
         raise NotImplementedError(
             "%s encoder not yet implemented. Patches welcome." % self)
 
@@ -1415,6 +1425,8 @@ class TransRecEF(TransparentEF):
             t = self._tlv() if inspect.isclass(self._tlv) else self._tlv
             t.from_dict(abstract_data)
             return t.to_tlv()
+        if 'raw' in abstract_data:
+            return h2b(abstract_data['raw'])
         raise NotImplementedError(
             "%s encoder not yet implemented. Patches welcome." % self)