From e62b4df7edd8806932237e15b1d243bfdfdd1b4f Mon Sep 17 00:00:00 2001
From: Steven Fackler <sfackler@gmail.com>
Date: Fri, 12 Jun 2015 00:44:51 -0700
Subject: [PATCH] Optimize copy_in a bit

io::copy has to first copy onto the stack and then into the writer, but
we can just explicitly call read_to_end which knows it's dealing with a
Vec.
---
 src/lib.rs | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/lib.rs b/src/lib.rs
index 83ea6850..04541bf8 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -1577,12 +1577,12 @@ impl<'conn> Statement<'conn> {
 
         let mut buf = vec![];
         loop {
-            match std::io::copy(&mut r.take(16 * 1024), &mut buf) {
+            match r.take(16 * 1024).read_to_end(&mut buf) {
                 Ok(0) => break,
-                Ok(len) => {
+                Ok(_) => {
                     try_desync!(conn, conn.stream.write_message(
                         &CopyData {
-                            data: &buf[..len as usize],
+                            data: &buf,
                         }));
                     buf.clear();
                 }