Make mode always u32 and switch to has_mode for StatRes fbs (#761)

js/stat.ts

@@ -70,6 +70,7 @@ class FileInfoImpl implements FileInfo {
     const modified = this._msg.modified().toFloat64();
     const accessed = this._msg.accessed().toFloat64();
     const created = this._msg.created().toFloat64();
+    const hasMode = this._msg.hasMode();
     const mode = this._msg.mode(); // negative for invalid mode (Windows)
     
     this._isFile = this._msg.isFile();
@@ -78,8 +79,8 @@ class FileInfoImpl implements FileInfo {
     this.modified = modified ? modified : null;
     this.accessed = accessed ? accessed : null;
     this.created = created ? created : null;
-    // null if invalid mode (Windows)
-    this.mode = mode >= 0 ? mode & 0o7777 : null;
+    // null on Windows
+    this.mode = hasMode ? mode : null;
   }
 
   isFile() {

src/fs.rs

@@ -80,7 +80,7 @@ pub fn mkdir(path: &Path, perm: u32) -> std::io::Result<()> {
 #[cfg(any(unix))]
 fn set_dir_permission(builder: &mut DirBuilder, perm: u32) {
   debug!("set dir perm to {}", perm);
-  builder.mode(perm);
+  builder.mode(perm & 0o777);
 }
 
 #[cfg(not(any(unix)))]

src/handlers.rs

@@ -533,13 +533,13 @@ macro_rules! to_seconds {
 }
 
 #[cfg(any(unix))]
-fn get_mode(perm: fs::Permissions) -> i32 {
-  (perm.mode() as i32)
+fn get_mode(perm: fs::Permissions) -> u32 {
+  perm.mode()
 }
 
 #[cfg(not(any(unix)))]
-fn get_mode(_perm: fs::Permissions) -> i32 {
-  -1
+fn get_mode(_perm: fs::Permissions) -> u32 {
+  0
 }
 
 fn handle_stat(_d: *const DenoC, base: &msg::Base) -> Box<Op> {
@@ -568,6 +568,7 @@ fn handle_stat(_d: *const DenoC, base: &msg::Base) -> Box<Op> {
         accessed: to_seconds!(metadata.accessed()),
         created: to_seconds!(metadata.created()),
         mode: get_mode(metadata.permissions()),
+        has_mode: cfg!(target_family = "unix"),
         ..Default::default()
       },
     );

src/msg.fbs

@@ -212,8 +212,8 @@ table StatRes {
   modified:ulong;
   accessed:ulong;
   created:ulong;
-  mode: int = -1;
-  // negative mode for invalid (Windows); default to invalid
+  mode: uint;
+  has_mode: bool; // false on windows
 }
 
 root_type Base;