From 758d3e8cf9dea57265db436cdc8e709f05e9596d Mon Sep 17 00:00:00 2001
From: Roman Timushev <rtimush@gmail.com>
Date: Tue, 14 May 2024 16:50:56 +0200
Subject: [PATCH] backport: improve BufList::copy_to_bytes if len == remaining

---
 src/collect.rs | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/src/collect.rs b/src/collect.rs
index b0b0f0d..0d0d9ae 100644
--- a/src/collect.rs
+++ b/src/collect.rs
@@ -209,9 +209,15 @@ impl<T: Buf> Buf for BufList<T> {
             }
             Some(front) if front.remaining() > len => front.copy_to_bytes(len),
             _ => {
-                assert!(len <= self.remaining(), "`len` greater than remaining");
+                let rem = self.remaining();
+                assert!(len <= rem, "`len` greater than remaining");
                 let mut bm = BytesMut::with_capacity(len);
-                bm.put(self.take(len));
+                if rem == len {
+                    // .take() costs a lot more, so skip it if we don't need it
+                    bm.put(self);
+                } else {
+                    bm.put(self.take(len));
+                }
                 bm.freeze()
             }
         }