Don't throw an error on variable sized members.

This just means that the whole struct doesn't have a fixed size.

diff --git a/binary-types.lisp b/binary-types.lisp
index 72300c3..b540d74 100644 (file)
--- a/binary-types.lisp
+++ b/binary-types.lisp
@@ -672,6 +672,14 @@ read are returned."
               ',type-name)))))))
   
 
+(defun calculate-sizeof (slot-types)
+  (loop
+    for slot-type in slot-types
+    for sizeof = (sizeof slot-type)
+    when (null sizeof)
+      do (return)
+    sum sizeof))
+
 (defmacro define-binary-struct (name-and-options dummy-options &rest doc-slot-descriptions)
   (declare (ignore dummy-options))     ; clisp seems to require this..
   (let (embedded-declarations)
@@ -732,7 +740,7 @@ read are returned."
             (setf (find-binary-type ',type-name)
               (make-instance 'binary-struct
                 'name ',type-name
-                'sizeof (loop for s in ',slot-types sum (sizeof s))
+                'sizeof (calculate-sizeof ',slot-types)
                 'slots ',binslots
                 'offset 0
                 'constructor (find-symbol (format nil "~A-~A" '#:make ',type-name))))