[wasm/mg3d] feat #3: expose mg3d to wasm glue

um_wasm/src/exports/mg3d.rs

@@ -0,0 +1,30 @@
+use umc_mg3d::{guess_key, Decipher};
+use wasm_bindgen::prelude::wasm_bindgen;
+use wasm_bindgen::JsError;
+
+/// Migu3D MG3D file decipher.
+#[wasm_bindgen(js_name=Migu3D)]
+pub struct JsMigu3D(Decipher);
+
+#[wasm_bindgen(js_class=Migu3D)]
+impl JsMigu3D {
+    /// Create a new decipher and guess its key from first 0x100 bytes.
+    #[wasm_bindgen(js_name=fromHeader)]
+    pub fn from_header(header: &[u8]) -> Result<JsMigu3D, JsError> {
+        let key = guess_key(header).ok_or_else(|| JsError::new("failed to guess key"))?;
+        let decipher = Decipher::new_from_final_key(&key)?;
+        Ok(JsMigu3D(decipher))
+    }
+
+    /// Create a new decipher from file_key
+    #[wasm_bindgen(js_name=fromFileKey)]
+    pub fn from_file_key(file_key: &str) -> Result<JsMigu3D, JsError> {
+        let decipher = Decipher::new_from_file_key(file_key)?;
+        Ok(JsMigu3D(decipher))
+    }
+
+    /// Decrypt encrypted buffer part.
+    pub fn decrypt(&self, buffer: &mut [u8], offset: usize) {
+        self.0.decrypt(buffer, offset)
+    }
+}

um_wasm/src/exports/mod.rs

@@ -2,6 +2,7 @@ pub mod audio;
 pub mod joox;
 pub mod kgm;
 pub mod kuwo;
+pub mod mg3d;
 pub mod ncm;
 pub mod qmc;
 pub mod qtfm;