Return the hexadecimal WKB of every type as its string alone

builder/build_pymeos_functions.py

@@ -487,6 +487,16 @@ def build_function_string(function_name: str, return_type: ReturnType, parameter
         function_return_type = "bytes"
         result_manipulation = f"    return bytes(_ffi.buffer(result, {size}[0])) if result != _ffi.NULL else None"
         out_params = []
+    # A string MEOS returns with its length written through a size_t pointer (the
+    # hexadecimal WKB and EWKB of every type) is the string alone: the length is the
+    # string's own, as GoMEOS's tools/objectgen.py and MEOS.NET's method_for drop it.
+    elif (
+        result_param is None
+        and return_type.ctype.replace(" ", "") == "char*"
+        and len(out_params) == 1
+        and out_params[0].ctype.replace(" ", "") == "size_t*"
+    ):
+        out_params = []
     out_types = [p.get_ptype_without_pointers() for p in out_params]
     out_values = [f"{p.name}[0]" for p in out_params]
 

builder/smoke_test.py

@@ -37,10 +37,18 @@
     ann = inspect.signature(getattr(f, name)).return_annotation
     assert ann in (bytes, "bytes"), f"{name} returns {ann}, not bytes"
 
+# A function returning a string and its length through a size_t output parameter
+# returns the string alone: the hexadecimal WKB and EWKB of every type.
+for name in ("set_as_hexwkb", "temporal_as_hexwkb", "tspatial_as_hexewkb", "npoint_as_hexwkb", "pose_as_hexewkb"):
+    ann = inspect.signature(getattr(f, name)).return_annotation
+    assert "tuple" not in str(ann), f"{name} returns {ann}, not the string alone"
+
 # Live initialisation check: the standard happy-path cycle works, and a WKB
-# encoding comes back as bytes.
+# encoding comes back as bytes and its hexadecimal form as their string.
 meos_initialize("UTC")
 wkb = f.set_as_wkb(f.intset_in("{1, 2, 3}"), 4)
 assert isinstance(wkb, bytes) and len(wkb) > 0, f"set_as_wkb returned {type(wkb)}"
+hexwkb = f.set_as_hexwkb(f.intset_in("{1, 2, 3}"), 4)
+assert isinstance(hexwkb, str) and bytes.fromhex(hexwkb) == wkb, f"set_as_hexwkb returned {hexwkb!r}"
 meos_finalize()
 print(f"PyMEOS CFFI build + shape smoke test OK on {label}")