spwan blocking task only for checksum update

1 files changed, 4 insertions, 3 deletions

diff --git a/src/lib.rs b/src/lib.rs
index 8dab917..698cf31 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -91,20 +91,21 @@ async fn file_checksum(path: PathBuf) -> std::io::Result<String> {
 
     let file = File::open(path)?;
     let mut reader = BufReader::new(file);
-    let mut buf = vec![0; BUF_SIZE];
     loop {
+        let mut buf = vec![0; BUF_SIZE];
         let n = reader.read(&mut buf)?;
         if n == 0 {
             break;
         }
-        update_checksum(&mut hasher, &buf[..n]);
+        hasher = tokio::task::spawn_blocking(move || update_checksum(hasher, &buf[..n])).await?;
     }
     let hash = hasher.finalize();
     Ok(format!("{:x}", hash))
 }
 
-fn update_checksum(hasher: &mut Sha256, data: &[u8]) {
+fn update_checksum(mut hasher: Sha256, data: &[u8]) -> Sha256 {
     hasher.update(data);
+    hasher
 }
 
 mod mode {