fix(zip): handle ZIP64 files missing indicators of ZIP64.

Sometimes large zip files created with 7z are missing indicators that they're
ZIP64 (see is_zip64() implementation for details on heuristics we use to
detect ZIP64).

Since we can't rely on our heuristics, we simply fallback to ZIP64 if we
can't find ZIP32 EOCDs.

unblob/handlers/archive/zip.py

@@ -188,7 +188,8 @@ def calculate_chunk(self, file: File, start_offset: int) -> Optional[ValidChunk]
             if offset == end_of_central_directory_offset:
                 break
         else:
-            raise InvalidInputFormat("Missing EOCD record header in ZIP chunk.")
+            # if we can't find 32bit ZIP EOCD, we fall back to ZIP64
+            end_of_central_directory = self._parse_zip64(file, start_offset, offset)
 
         has_encrypted_files = self.has_encrypted_files(
             file, start_offset, end_of_central_directory