--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/mujs/utf.h	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,48 @@
+/*
+ * The authors of this software are Rob Pike and Ken Thompson.
+ *              Copyright (c) 2002 by Lucent Technologies.
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose without fee is hereby granted, provided that this entire notice
+ * is included in all copies of any software which is or includes a copy
+ * or modification of this software and in all copies of the supporting
+ * documentation for such software.
+ * THIS SOFTWARE IS BEING PROVIDED "AS IS", WITHOUT ANY EXPRESS OR IMPLIED
+ * WARRANTY.  IN PARTICULAR, NEITHER THE AUTHORS NOR LUCENT TECHNOLOGIES MAKE
+ * ANY REPRESENTATION OR WARRANTY OF ANY KIND CONCERNING THE MERCHANTABILITY
+ * OF THIS SOFTWARE OR ITS FITNESS FOR ANY PARTICULAR PURPOSE.
+ */
+#ifndef js_utf_h
+#define js_utf_h
+
+typedef int Rune;	/* 32 bits */
+
+#define chartorune	jsU_chartorune
+#define runetochar	jsU_runetochar
+#define runelen		jsU_runelen
+
+#define isalpharune	jsU_isalpharune
+#define islowerrune	jsU_islowerrune
+#define isupperrune	jsU_isupperrune
+#define tolowerrune	jsU_tolowerrune
+#define toupperrune	jsU_toupperrune
+
+enum
+{
+	UTFmax		= 4,		/* maximum bytes per rune */
+	Runesync	= 0x80,		/* cannot represent part of a UTF sequence (<) */
+	Runeself	= 0x80,		/* rune and UTF sequences are the same (<) */
+	Runeerror	= 0xFFFD,	/* decoding error in UTF */
+	Runemax		= 0x10FFFF,	/* maximum rune value */
+};
+
+int	chartorune(Rune *rune, const char *str);
+int	runetochar(char *str, const Rune *rune);
+int	runelen(int c);
+
+int		isalpharune(Rune c);
+int		islowerrune(Rune c);
+int		isupperrune(Rune c);
+Rune		tolowerrune(Rune c);
+Rune		toupperrune(Rune c);
+
+#endif