[wasm/kgm] refactor: simplify kgm interface

um_wasm/src/exports/kgm.rs

@@ -2,32 +2,18 @@ use umc_kgm::{header::Header, Decipher};
 use wasm_bindgen::prelude::wasm_bindgen;
 use wasm_bindgen::JsError;
 
-/// KuGou KGM file header.
-#[wasm_bindgen(js_name=KuGouHeader)]
-pub struct JsKuGouHeader(Header);
-
-#[wasm_bindgen(js_class = KuGouHeader)]
-impl JsKuGouHeader {
-    /// Parse the KuGou header (0x400 bytes)
-    pub fn parse(header: &[u8]) -> Result<JsKuGouHeader, JsError> {
-        Ok(JsKuGouHeader(
-            Header::from_buffer(header).map_err(JsError::from)?,
-        ))
-    }
-}
-
 /// KuGou KGM file decipher.
-#[wasm_bindgen(js_name=KuGouDecipher)]
-pub struct JsKuGouDecipher(Decipher);
+#[wasm_bindgen(js_name=KuGou)]
+pub struct JsKuGou(Decipher);
 
-#[wasm_bindgen(js_class=KuGouDecipher)]
-impl JsKuGouDecipher {
-    /// Create an instance of cipher (decipher) for decryption
-    #[wasm_bindgen(constructor)]
-    pub fn new(header: &JsKuGouHeader) -> Result<JsKuGouDecipher, JsError> {
-        Ok(JsKuGouDecipher(
-            Decipher::new(&header.0).map_err(JsError::from)?,
-        ))
+#[wasm_bindgen(js_class = KuGou)]
+impl JsKuGou {
+    /// Parse the KuGou header (0x400 bytes)
+    pub fn from_header(header: &[u8]) -> Result<JsKuGou, JsError> {
+        let header = Header::from_buffer(header).map_err(JsError::from)?;
+        let decipher = Decipher::new(&header).map_err(JsError::from)?;
+
+        Ok(JsKuGou(decipher))
     }
 
     /// Decrypt a buffer.