From bc0053a2e73d5f8b537a2389a8f67b1b684c67be Mon Sep 17 00:00:00 2001
From: KAMADA Ken'ichi <kamada@nanohz.org>
Date: Wed, 5 Feb 2020 23:05:10 +0900
Subject: [PATCH] Use Vec::drain to avoid an extra memory allocation.

---
 src/jpeg.rs | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/jpeg.rs b/src/jpeg.rs
index 5a5e73c..01fab5f 100644
--- a/src/jpeg.rs
+++ b/src/jpeg.rs
@@ -92,7 +92,8 @@ fn get_exif_attr_sub<R>(reader: &mut R)
         let mut seg = Vec::new();
         reader.by_ref().take(seglen as u64 - 2).read_to_end(&mut seg)?;
         if code == marker::APP1 && seg.starts_with(&EXIF_ID) {
-            return Ok(seg.split_off(EXIF_ID.len()));
+            seg.drain(..EXIF_ID.len());
+            return Ok(seg);
         }
         if code == marker::SOS {
             // Skipping the scan data is handled in the main loop,