extmod/moductypes: Make sizeof() accept "layout" parameter.

sizeof() can work in two ways: a) calculate size of already instantiated structure ("sizeof variable") - in this case we already no layout; b) size of structure decsription ("sizeof type"). In the latter case, LAYOUT_NATIVE was assumed, but there should possibility to calculate size for other layouts too. So, with this patch, there're now 2 forms: uctypes.sizeof(struct) uctypes.sizeof(struct_desc, layout)

Author: pfalcon

extmod/moductypes.c

@@ -269,7 +269,8 @@ STATIC mp_uint_t uctypes_struct_size(mp_obj_t desc_in, int layout_type, mp_uint_
  return total_size;
 }
 
-STATIC mp_obj_t uctypes_struct_sizeof(mp_obj_t obj_in) {
+STATIC mp_obj_t uctypes_struct_sizeof(size_t n_args, const mp_obj_t *args) {
+ mp_obj_t obj_in = args[0];
  mp_uint_t max_field_size = 0;
  if (MP_OBJ_IS_TYPE(obj_in, &mp_type_bytearray)) {
  return mp_obj_len(obj_in);
@@ -278,15 +279,22 @@ STATIC mp_obj_t uctypes_struct_sizeof(mp_obj_t obj_in) {
  // We can apply sizeof either to structure definition (a dict)
  // or to instantiated structure
  if (MP_OBJ_IS_TYPE(obj_in, &uctypes_struct_type)) {
+ if (n_args != 1) {
+ mp_raise_TypeError(NULL);
+ }
  // Extract structure definition
  mp_obj_uctypes_struct_t *obj = MP_OBJ_TO_PTR(obj_in);
  obj_in = obj->desc;
  layout_type = obj->flags;
+ } else {
+ if (n_args == 2) {
+ layout_type = mp_obj_get_int(args[1]);
+ }
  }
  mp_uint_t size = uctypes_struct_size(obj_in, layout_type, &max_field_size);
  return MP_OBJ_NEW_SMALL_INT(size);
 }
-STATIC MP_DEFINE_CONST_FUN_OBJ_1(uctypes_struct_sizeof_obj, uctypes_struct_sizeof);
+STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(uctypes_struct_sizeof_obj, 1, 2, uctypes_struct_sizeof);
 
 static inline mp_obj_t get_unaligned(uint val_type, byte *p, int big_endian) {
  char struct_type = big_endian ? '>' : '<';