Only warn on stitching function's sub function with wrong arity

Sub functions that make up a stitching function can be evaluated with
the wrong number of inputs/outputs, so it is not necessary to throw an
exception if the number of inputs/outputs do not match when loading
sub functions.

1 files changed, 6 insertions, 5 deletions

diff --git a/pdf/pdf_function.c b/pdf/pdf_function.c
index 18c16669..590ca626 100644
--- a/pdf/pdf_function.c
+++ b/pdf/pdf_function.c
@@ -1256,16 +1256,17 @@ load_stitching_func(pdf_function *func, pdf_document *xref, pdf_obj *dict)
 			sub = pdf_array_get(obj, i);
 			funcs[i] = pdf_load_function(xref, sub, 1, func->n);
 			/* RJW: "cannot load sub function %d (%d %d R)", i, pdf_to_num(sub), pdf_to_gen(sub) */
-			if (funcs[i]->m != 1 || funcs[i]->n != funcs[0]->n)
-				fz_throw(ctx, "sub function %d /Domain or /Range mismatch", i);
 			func->size += pdf_function_size(funcs[i]);
 			func->u.st.k ++;
-		}
 
-		if (func->n != funcs[0]->n)
-			fz_throw(ctx, "sub function /Domain or /Range mismatch");
+			if (funcs[i]->m != func->m)
+				fz_warn(ctx, "sub function %d has too few/many inputs", i);
+			if (funcs[i]->n != func->n)
+				fz_warn(ctx, "sub function %d has too few/many outputs", i);
+		}
 	}
 
+
 	obj = pdf_dict_gets(dict, "Bounds");
 	if (!pdf_is_array(obj))
 		fz_throw(ctx, "stitching function has no bounds");