Fix reading.

src/io.rs

@@ -1,6 +1,6 @@
 use std::fs::{File, OpenOptions};
 use std::io::{self, Seek, SeekFrom};
-use std::os::unix::fs::{FileExt, OpenOptionsExt};
+use std::os::unix::fs::OpenOptionsExt;
 
 use crate::cli::CONFIG;
 
@@ -23,7 +23,7 @@ pub fn get_stream_length<S: Seek>(stream: &mut S) -> io::Result<u64> {
 pub fn load_input() -> anyhow::Result<File> {
     OpenOptions::new()
         .read(true)
-        //.custom_flags(libc::O_DIRECT)
+        .custom_flags(libc::O_DIRECT)
         .open(&CONFIG.input)
         .with_context(|| format!("Failed to open input file: {}", &CONFIG.input.display()))