buffered-reader: Use idiomatic conversion to detect truncation.

1 files changed, 4 insertions, 4 deletions

diff --git a/buffered-reader/src/file_unix.rs b/buffered-reader/src/file_unix.rs
index ee4f94d5..a95a44eb 100644
--- a/buffered-reader/src/file_unix.rs
+++ b/buffered-reader/src/file_unix.rs
@@ -155,10 +155,10 @@ impl<'a, C: fmt::Debug + Sync + Send> File<'a, C> {
         }
 
         // Be nice to 32 bit systems.
-        if length > usize::max_value() as u64 {
-            return generic(file, cookie);
-        }
-        let length = length as usize;
+        let length: usize = match length.try_into() {
+            Ok(v) => v,
+            Err(_) => return generic(file, cookie),
+        };
 
         let fd = file.as_raw_fd();
         let addr = unsafe {