From c518f2dd7040eca7591d3cacffe3646d8f54ac7c Mon Sep 17 00:00:00 2001
From: Lukas Kalbertodt <lukas.kalbertodt@gmail.com>
Date: Thu, 14 Mar 2019 13:27:49 +0100
Subject: Overwrite Cursor's `Seek::stream_{len, position}` for performance

---
 src/libstd/io/cursor.rs | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'src/libstd')

diff --git a/src/libstd/io/cursor.rs b/src/libstd/io/cursor.rs
index 873da0898c7..247d45c3ec9 100644
--- a/src/libstd/io/cursor.rs
+++ b/src/libstd/io/cursor.rs
@@ -212,6 +212,14 @@ impl<T> io::Seek for Cursor<T> where T: AsRef<[u8]> {
                            "invalid seek to a negative or overflowing position"))
         }
     }
+
+    fn stream_len(&mut self) -> io::Result<u64> {
+        Ok(self.inner.as_ref().len() as u64)
+    }
+
+    fn stream_position(&mut self) -> io::Result<u64> {
+        Ok(self.pos)
+    }
 }
 
 #[stable(feature = "rust1", since = "1.0.0")]
-- 
cgit 1.4.1-3-g733a5