Reading a TPad

src/rootfilespec/bootstrap/TList.py

@@ -46,14 +46,10 @@ def update_members(cls, members: Members, buffer: ReadBuffer):
                 msg = f"Expected TObject but got {item!r}"
                 raise ValueError(msg)
             # No idea why there is a null pad byte here
-            pad, buffer = buffer.consume(1)
-            if pad != b"\x00":
-                if pad == b"\x01":
-                    # TODO: understand this case (e.g. uproot-issue-350.root)
-                    (mystery,), buffer = buffer.unpack(">B")
-                else:
-                    msg = f"Unexpected pad byte in TList: {pad!r}"
-                    raise ValueError(msg)
+            (pad,), buffer = buffer.unpack(">B")
+            if pad != 0:
+                # TODO: understand this case (e.g. uproot-issue-350.root)
+                mystery, buffer = buffer.consume(pad)
             items.append(item)
         members["items"] = items
         return members, buffer

src/rootfilespec/bootstrap/TObject.py

@@ -50,6 +50,17 @@ class TObjFlag(IntFlag):
     """TStreamerElement status bit or kInvalidObject"""
     kListOfRules = 0x4000
     """The schema evolution rules stored at the end of the streamer info"""
+    kMysteryCanvas1 = 0x100000
+    """Appears in some TCanvas objects, not sure what it means."""
+    kMysteryCanvas2 = 0x200000
+    """Appears in some TCanvas objects, not sure what it means."""
+    kMysteryPad1 = 0x200
+    """Appears in some TCanvas objects, not sure what it means."""
+    kMysteryPad2 = 0x400
+    """Appears in some TCanvas objects, not sure what it means."""
+    kMysteryPad3 = 0x800
+    """Appears in some TCanvas objects, not sure what it means."""
+    # TODO: there are too many of these mystery bits, we should remove invalid bit checks
 
     # TODO: validate on initialization that no bits are set that are not defined in this class
     def __repr__(self):

src/rootfilespec/bootstrap/__init__.py

@@ -18,6 +18,7 @@
     RooLinkedList,
     TAtt3D,
     TFormula,
+    TQObject,
     TVirtualIndex,
     Uninterpreted,
 )
@@ -75,6 +76,7 @@
     "TNamed",
     "TObjArray",
     "TObject",
+    "TQObject",
     "TSeqCollection",
     "TStreamerBase",
     "TStreamerBasicPointer",

src/rootfilespec/bootstrap/assumed.py

@@ -140,3 +140,18 @@ def update_members(cls, members: Members, buffer: ReadBuffer):
 
 
 DICTIONARY["TFormula"] = TFormula
+
+
+@serializable
+class TQObject(ROOTSerializable):
+    """Qt object communication object for ROOT GUIs
+
+    Nothing is serialized
+    """
+
+    @classmethod
+    def update_members(cls, members: Members, buffer: ReadBuffer):
+        return members, buffer
+
+
+DICTIONARY["TQObject"] = TQObject