- /* Fixed length bytes is only empty if its length is fixed
- * as 0. Which would be pretty strange, but we can check
- * it anyway. */
- return field->data_size == 0;
+ if (PB_LTYPE(field->type) == PB_LTYPE_BYTES)
+ {
+ const pb_bytes_array_t *bytes = (const pb_bytes_array_t*)pData;
+ return bytes->size == 0;
+ }
+ else if (PB_LTYPE(field->type) == PB_LTYPE_STRING)
+ {
+ return *(const char*)pData == '\0';
+ }
+ else if (PB_LTYPE(field->type) == PB_LTYPE_FIXED_LENGTH_BYTES)
+ {
+ /* Fixed length bytes is only empty if its length is fixed
+ * as 0. Which would be pretty strange, but we can check
+ * it anyway. */
+ return field->data_size == 0;
+ }
+ else if (PB_LTYPE(field->type) == PB_LTYPE_SUBMESSAGE)
+ {
+ /* Check all fields in the submessage to find if any of them
+ * are non-zero. The comparison cannot be done byte-per-byte
+ * because the C struct may contain padding bytes that must
+ * be skipped.
+ */
+ pb_field_iter_t iter;
+ if (pb_field_iter_begin(&iter, (const pb_field_t*)field->ptr, pb_const_cast(pData)))
+ {
+ do
+ {
+ if (!pb_check_proto3_default_value(iter.pos, iter.pData))
+ {
+ return false;
+ }
+ } while (pb_field_iter_next(&iter));
+ }
+ return true;
+ }