feat: dos header的读取写完了。

src-tauri/src/services/file.rs

@@ -1,15 +1,12 @@
 use memmap::*;
 
 // TODO: 打开文件，并将文件映射到内存
-pub fn mmap_mut_file(file_path: &str) -> Result<MmapMut, std::io::Error> {
-    let file = std::fs::OpenOptions::new()
-        .read(true)
-        .write(true)
-        .open(file_path)?;
+pub fn mmap_mut_file(file_path: &str) -> Result<Mmap, std::io::Error> {
+    let file = std::fs::OpenOptions::new().read(true).open(file_path)?;
 
     unsafe {
         MmapOptions::new()
-            .map_mut(&file)
+        .map(&file)
             .map_err(|e| std::io::Error::new(std::io::ErrorKind::Other, e.to_string()))
     }
 }