diff --git a/utils.hpp b/utils.hpp
index fecf12e..db49f51 100644
--- a/utils.hpp
+++ b/utils.hpp
@@ -77,13 +77,14 @@
 /** @brief Convert effecter data to structure of set_effecter_state_field
  *
  *  @param[in] effecterData - the date of effecter
- *  @param[out] effecter_id - a handle that is used to identify and access the
- * effecter
- *  @param[out] stateField - structure of set_effecter_state_field
+ *  @param[in] effecterCount - the number of individual sets of effecter
+ *                              information
+ *  @return[out] parse success and get a valid set_effecter_state_field
+ *               structure, return nullopt means parse failed
  */
-bool decodeEffecterData(const std::vector<uint8_t>& effecterData,
-                        uint16_t& effecter_id,
-                        std::vector<set_effecter_state_field>& stateField);
+std::optional<std::vector<set_effecter_state_field>>
+    parseEffecterData(const std::vector<uint8_t>& effecterData,
+                      uint8_t effecterCount);
 
 /**
  *  @brief creates an error log