Fix/support material ps3

gcode_metadata/metadata.py

@@ -194,6 +194,26 @@ def same_or_nothing(value_list):
     return value_list[0]
 
 
+def support_material_flag(value: str) -> int:
+    """Read `support_material` as 0/1 in both slicer generations.
+
+    PrusaSlicer 3.0 names the mode; any mode but `none` generates supports,
+    which is what `1` meant before 3.0.
+
+    >>> support_material_flag("1"), support_material_flag("0")
+    (1, 0)
+    >>> support_material_flag("everywhere")
+    1
+    >>> support_material_flag("enforcers_only")
+    1
+    >>> support_material_flag("none")
+    0
+    """
+    if value in ("none", "enforcers_only", "everywhere"):
+        return int(value != "none")
+    return int(value)
+
+
 def extract_data(input_string):
     """Extracts metadata from the filename
         >>> extract_data("HP_PLA,PLA_MK3SMMU3_3h22m.gcode") #doctest: +ELLIPSIS
@@ -554,7 +574,7 @@ def set_attr(self, name, value):
         "layer_height": float,
         "fill_density": str,
         "brim_width": int,
-        "support_material": int,
+        "support_material": support_material_flag,
         "ironing": int,
         "quiet_percent_present": bool,
         "quiet_left_present": bool,
@@ -603,7 +623,10 @@ def set_attr(self, name, value):
     }
 
     METADATA_START_OFFSET = 800000  # Read 800KB from the start
-    METADATA_END_OFFSET = 40000  # Read 40KB at the end of the file
+    # Read 256KB at the end of the file. PrusaSlicer 3.0 writes a JSON copy of
+    # the config (~56KB for 4 tools, growing with the tool count) between
+    # max_layer_z and the INI block, putting max_layer_z ~90KB from the end.
+    METADATA_END_OFFSET = 256000
     # Number of times the search for M73 is going to repeat if info
     # is incomplete
     MAX_M73_SEARCH_BYTES = 100000