From d53d2536202cd57e8e1fc64d67ba31741562b07e Mon Sep 17 00:00:00 2001
From: Alexander Zhou <Alexander.zhou.boy@gmail.com>
Date: Fri, 27 May 2022 11:49:42 +0800
Subject: [PATCH] Eliminated several seconds of delay when loading big mp4 file

---
 src/kemal/helpers/helpers.cr | 15 +--------------
 1 file changed, 1 insertion(+), 14 deletions(-)

diff --git a/src/kemal/helpers/helpers.cr b/src/kemal/helpers/helpers.cr
index bf212a2..11a6b62 100644
--- a/src/kemal/helpers/helpers.cr
+++ b/src/kemal/helpers/helpers.cr
@@ -216,20 +216,7 @@ private def multipart(file, env : HTTP::Server::Context)
     env.response.headers["Accept-Ranges"] = "bytes"
     env.response.headers["Content-Range"] = "bytes #{startb}-#{endb}/#{fileb}" # MUST
 
-    if startb > 1024
-      skipped = 0_i64
-      # file.skip only accepts values less or equal to 1024 (buffer size, undocumented)
-      until (increase_skipped = skipped + 1024_i64) > startb
-        file.skip(1024)
-        skipped = increase_skipped
-      end
-      if (skipped_minus_startb = skipped - startb) > 0
-        file.skip skipped_minus_startb
-      end
-    else
-      file.skip(startb)
-    end
-
+    file.seek(startb)
     IO.copy(file, env.response, content_length)
   else
     env.response.content_length = fileb