Add caching to security descriptor lookups (#35)

dissect/ntfs/secure.py

@@ -1,6 +1,7 @@
 from __future__ import annotations
 
 import io
+from functools import lru_cache
 from typing import BinaryIO, Iterator
 from uuid import UUID
 
@@ -38,6 +39,8 @@ def __init__(self, record: MftRecord = None, sds: BinaryIO = None):
         if not hasattr(self.sds, "size"):
             self.sds.size = self.sds.seek(0, io.SEEK_END)
 
+        self.lookup = lru_cache(4096)(self.lookup)
+
     def _iter_entries(self, offset: int = 0) -> Iterator[c_ntfs._SECURITY_DESCRIPTOR_HEADER]:
         """Iterate over all SDS entries, optionally starting from a specific offset.