maraiah: add open_mac_file function

maraiah/file.rs

@@ -1,8 +1,7 @@
 //! File utilities.
 
-use crate::err::*;
-use std::fs;
-use std::io::{SeekFrom, prelude::*};
+use crate::{err::*, machdr};
+use std::{fs, path::Path, io::{SeekFrom, prelude::*}};
 
 /// Confirms that the path `p` is a folder.
 pub fn validate_folder_path(p: &str) -> ResultS<()>
@@ -15,6 +14,16 @@ pub fn validate_folder_path(p: &str) -> ResultS<()>
    }
 }
 
+/// Opens the file at `path` and skips past any macintosh headers.
+pub fn open_mac_file<P: AsRef<Path>>(path: P) -> ResultS<fs::File>
+{
+   let mut fp = fs::File::open(path)?;
+
+   machdr::skip_mac_header(&mut fp);
+
+   Ok(fp)
+}
+
 impl<T> Drop for SeekBackToStart<T>
    where T: Seek
 {