efi/file: fixup dir/file name

Fat filename can be 12, that is filename with length of 8 and extension
name with length of 3 and a separator like '.'. But directory name
length limits to 11. That's say some name can't be shown correctly. For
that case, we can do a fixup to give a correct name to userspace.

Fixes: #261
Signed-off-by: Jianyong Wu <[email protected]>

src/efi/file.rs

@@ -106,7 +106,7 @@ pub extern "efiapi" fn read(file: *mut FileProtocol, size: *mut usize, buf: *mut
             Err(_) => return Status::DEVICE_ERROR,
         };
 
-        let (node, name) = match d.next_node() {
+        let (node, mut name) = match d.next_node() {
             Ok(node) => node,
             Err(crate::fat::Error::EndOfFile) => {
                 unsafe { *size = 0 };
@@ -115,6 +115,17 @@ pub extern "efiapi" fn read(file: *mut FileProtocol, size: *mut usize, buf: *mut
             Err(_) => return Status::DEVICE_ERROR,
         };
 
+        // Fixup for Director or file name, when the length of its name and extend name equals 11. There maybe no
+        // separation between them. If so, add it.
+        if name[10] >= b'a' && name[10] <= b'z'
+            || name[10] >= b'A' && name[10] <= b'Z' && name[7] != b' ' && name[7] != b'.'
+        {
+            name[11] = name[10];
+            name[10] = name[9];
+            name[9] = name[8];
+            name[8] = b'.';
+        }
+
         let attribute = match &node {
             crate::fat::Node::Directory(_) => r_efi::protocols::file::DIRECTORY,
             crate::fat::Node::File(_) => r_efi::protocols::file::ARCHIVE,

src/fat.rs

@@ -403,9 +403,9 @@ impl<'a> Directory<'a> {
         }
     }
 
-    pub fn next_node(&mut self) -> Result<(Node, [u8; 11]), Error> {
+    pub fn next_node(&mut self) -> Result<(Node, [u8; 12]), Error> {
         let de = self.next_entry()?;
-        let mut name = [0_u8; 11];
+        let mut name = [0_u8; 12];
         name_to_str(core::str::from_utf8(&de.name).unwrap(), &mut name);
 
         match de.file_type {