chore: Add missing ZipFileData::is_dir() method

src/types.rs

@@ -362,6 +362,14 @@ pub struct ZipFileData {
 }
 
 impl ZipFileData {
+    #[allow(dead_code)]
+    pub fn is_dir(&self) -> bool {
+        self.file_name
+            .chars()
+            .next_back()
+            .map_or(false, |c| c == '/' || c == '\\')
+    }
+
     pub fn file_name_sanitized(&self) -> PathBuf {
         let no_null_filename = match self.file_name.find('\0') {
             Some(index) => &self.file_name[0..index],