From 3582e177e2769524b539c08ac1f76024f26a929e Mon Sep 17 00:00:00 2001
From: =?utf8?q?Paul=20H=C3=A4nsch?= <paul@plutz.net>
Date: Mon, 12 Jun 2023 13:38:47 +0200
Subject: [PATCH] Bugfix: file uploads got NULL characters converted to
 Linefeeds when using busybox sed

---
 multipart.sh | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/multipart.sh b/multipart.sh
index 09e3ca8..7c0d5dd 100755
--- a/multipart.sh
+++ b/multipart.sh
@@ -53,8 +53,9 @@ multipart(){
       ;;
     "${CR}")
       if [ $state = dheader ]; then
-        sed -n "/--${multipart_boundary}\(--\)\?${CR}/q; p;" \
-        | head -c-2
+        # Do not use `sed -n` (or busybox sed will "convert" NULL to LF)
+        sed "/--${multipart_boundary}\(--\)\?${CR}/{x;q;}" \
+        | head -c-3
         return 0;
       fi
       [ $state = header ] && state=junk
-- 
2.39.2