feat: add kgm v5 (kgg) support.

um_wasm/src/exports/kgm.rs

@@ -2,18 +2,55 @@ 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 JsKuGouHdr(Header);
+
+#[wasm_bindgen(js_class=KuGouHeader)]
+impl JsKuGouHdr {
+    /// Parse the KuGou header (0x400 bytes recommended).
+    #[wasm_bindgen(constructor)]
+    pub fn new(header: &[u8]) -> Result<Self, JsError> {
+        let header = Header::from_buffer(header).map_err(JsError::from)?;
+        Ok(Self(header))
+    }
+
+    /// Get the audio hash (kgm v5).
+    #[wasm_bindgen(getter, js_name = "audioHash")]
+    pub fn get_audio_hash(&self) -> String {
+        self.0.audio_hash.clone()
+    }
+
+    /// Get version
+    #[wasm_bindgen(getter, js_name = "version")]
+    pub fn get_crypto_version(&self) -> u32 {
+        self.0.crypto_version
+    }
+
+    /// Get offset to encrypted data
+    #[wasm_bindgen(getter, js_name = "offsetToData")]
+    pub fn get_offset_to_data(&self) -> u32 {
+        self.0.offset_to_data as u32
+    }
+}
+
 /// KuGou KGM file decipher.
 #[wasm_bindgen(js_name=KuGou)]
 pub struct JsKuGou(Decipher);
 
-#[wasm_bindgen(js_class = KuGou)]
+#[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)?;
+    /// Parse the KuGou header (0x400 bytes recommended).
+    pub fn from_header(header: &[u8]) -> Result<Self, JsError> {
+        let header = JsKuGouHdr::new(header)?;
+        Self::from_header_v5(&header, None)
+    }
 
-        Ok(JsKuGou(decipher))
+    /// Parse the KuGou header (0x400 bytes recommended).
+    #[wasm_bindgen(js_name=fromHeaderV5)]
+    pub fn from_header_v5(header: &JsKuGouHdr, ekey: Option<String>) -> Result<Self, JsError> {
+        let decipher = Decipher::new_v5(&header.0, ekey).map_err(JsError::from)?;
+        Ok(Self(decipher))
     }
 
     /// Decrypt a buffer.