From 80e9d1ffbd54126246be1a59f762f09997936234 Mon Sep 17 00:00:00 2001
From: Nick Wellnhofer <wellnhofer@aevum.de>
Date: Tue, 23 Apr 2024 19:52:09 +0200
Subject: [PATCH] utf8: Fix encoding of U+FFFE and U+FFFF

Fixes #548.
---
 src/utf8.c          | 6 ------
 test/regression.txt | 8 ++++++++
 2 files changed, 8 insertions(+), 6 deletions(-)

diff --git a/src/utf8.c b/src/utf8.c
index 95f87e58c..48697c77d 100644
--- a/src/utf8.c
+++ b/src/utf8.c
@@ -199,12 +199,6 @@ void cmark_utf8proc_encode_char(int32_t uc, cmark_strbuf *buf) {
     dst[0] = (uint8_t)(0xC0 + (uc >> 6));
     dst[1] = 0x80 + (uc & 0x3F);
     len = 2;
-  } else if (uc == 0xFFFF) {
-    dst[0] = 0xFF;
-    len = 1;
-  } else if (uc == 0xFFFE) {
-    dst[0] = 0xFE;
-    len = 1;
   } else if (uc < 0x10000) {
     dst[0] = (uint8_t)(0xE0 + (uc >> 12));
     dst[1] = 0x80 + ((uc >> 6) & 0x3F);
diff --git a/test/regression.txt b/test/regression.txt
index 71efb24e6..75196d48d 100644
--- a/test/regression.txt
+++ b/test/regression.txt
@@ -275,3 +275,11 @@ Case fold test
 .
 <p><a href="/url">link</a></p>
 ````````````````````````````````
+
+https://github.com/commonmark/cmark/issues/548
+```````````````````````````````` example
+(&#xFFFE;&#xFFFF;)
+.
+<p>(￾￿)</p>
+````````````````````````````````
+