Fix audio and movie unpack issue

src/utils/xored_stream.rs

@@ -57,3 +57,73 @@ impl<T: std::fmt::Debug> std::fmt::Debug for XoredStream<T> {
             .finish()
     }
 }
+
+/// A stream that XORs data with a repeating key based on the current position.
+pub struct XoredKeyStream<T> {
+    inner: T,
+    key: Vec<u8>,
+    base_position: u64,
+}
+
+impl<T> XoredKeyStream<T> {
+    pub fn new(inner: T, key: Vec<u8>, base_position: u64) -> Self {
+        XoredKeyStream {
+            inner,
+            key,
+            base_position,
+        }
+    }
+}
+
+impl<T: Read + Seek> Read for XoredKeyStream<T> {
+    fn read(&mut self, buf: &mut [u8]) -> std::io::Result<usize> {
+        let key_len = self.key.len();
+        let start_pos =
+            ((self.inner.stream_position()? + self.base_position) % (key_len as u64)) as usize;
+        let readed = self.inner.read(buf)?;
+        for i in 0..readed {
+            buf[i] ^= self.key[(start_pos + i) % key_len];
+        }
+        Ok(readed)
+    }
+}
+
+impl<T: Seek> Seek for XoredKeyStream<T> {
+    fn seek(&mut self, pos: std::io::SeekFrom) -> std::io::Result<u64> {
+        self.inner.seek(pos)
+    }
+
+    fn rewind(&mut self) -> std::io::Result<()> {
+        self.inner.rewind()
+    }
+
+    fn stream_position(&mut self) -> std::io::Result<u64> {
+        self.inner.stream_position()
+    }
+}
+
+impl<T: Write + Seek> Write for XoredKeyStream<T> {
+    fn write(&mut self, buf: &[u8]) -> std::io::Result<usize> {
+        let key_len = self.key.len();
+        let start_pos =
+            ((self.inner.stream_position()? + self.base_position) % (key_len as u64)) as usize;
+        let mut encrypted_buf = buf.to_vec();
+        for i in 0..buf.len() {
+            encrypted_buf[i] ^= self.key[(start_pos + i) % key_len];
+        }
+        self.inner.write(&encrypted_buf)
+    }
+
+    fn flush(&mut self) -> std::io::Result<()> {
+        self.inner.flush()
+    }
+}
+
+impl<T: std::fmt::Debug> std::fmt::Debug for XoredKeyStream<T> {
+    fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
+        f.debug_struct("XoredKeyStream")
+            .field("inner", &self.inner)
+            .field("base_position", &self.base_position)
+            .finish()
+    }
+}