add Cristal in the Loader factory method

cdiutils/load/loader.py

@@ -56,21 +56,24 @@ def from_setup(cls, beamline_setup: str, metadata: dict) -> "Loader":
         Returns:
             Loader: the subclass loader according to the provided name.
         """
-        if beamline_setup == "ID01BLISS":
+        if beamline_setup.lower() == "id01bliss":
             from . import BlissLoader
             return BlissLoader(**metadata)
-        if beamline_setup == "ID01SPEC":
+        if beamline_setup.lower() == "id01spec":
             from . import SpecLoader
             return SpecLoader(**metadata)
-        if beamline_setup == "SIXS2022":
+        if beamline_setup.lower() == "sixs2022":
             from . import SIXS2022Loader
             return SIXS2022Loader(**metadata)
-        if "P10" in beamline_setup:
+        if "p10" in beamline_setup.lower():
             from . import P10Loader
-            if beamline_setup == "P10EH2":
+            if beamline_setup.lower() == "p10eh2":
                 return P10Loader(hutch="EH2", **metadata)
             else:
                 return P10Loader(**metadata)
+        if beamline_setup.lower == "cristal":
+            from . import CristalLoader
+            return CristalLoader(**metadata)
         raise ValueError(f"Invalid beamline setup: {beamline_setup}")
 
     @staticmethod
@@ -93,7 +96,14 @@ def _check_load(data_or_path: np.ndarray | str) -> np.ndarray:
                 return np.load(data_or_path)
             if data_or_path.endswith(".npz"):
                 with np.load(data_or_path, "r") as file:
-                    return file["arr_0"]
+                    for possible_key in (
+                            "arr_0", "data", "mask", "flatfield", "flat_field"
+                    ):
+                        if possible_key in file.keys():
+                            return file[possible_key]
+                        raise KeyError(
+                            f"Unvalid file provided containing {file.keys()}."
+                        )
         elif data_or_path is None or isinstance(data_or_path, np.ndarray):
             return data_or_path
         raise ValueError(