--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/harfbuzz/src/test-gsub-would-substitute.cc	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,67 @@
+/*
+ * Copyright © 2010,2011  Google, Inc.
+ *
+ *  This is part of HarfBuzz, a text shaping library.
+ *
+ * Permission is hereby granted, without written agreement and without
+ * license or royalty fees, to use, copy, modify, and distribute this
+ * software and its documentation for any purpose, provided that the
+ * above copyright notice and the following two paragraphs appear in
+ * all copies of this software.
+ *
+ * IN NO EVENT SHALL THE COPYRIGHT HOLDER BE LIABLE TO ANY PARTY FOR
+ * DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES
+ * ARISING OUT OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN
+ * IF THE COPYRIGHT HOLDER HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH
+ * DAMAGE.
+ *
+ * THE COPYRIGHT HOLDER SPECIFICALLY DISCLAIMS ANY WARRANTIES, INCLUDING,
+ * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
+ * FITNESS FOR A PARTICULAR PURPOSE.  THE SOFTWARE PROVIDED HEREUNDER IS
+ * ON AN "AS IS" BASIS, AND THE COPYRIGHT HOLDER HAS NO OBLIGATION TO
+ * PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
+ *
+ * Google Author(s): Behdad Esfahbod
+ */
+
+#include "hb.hh"
+
+#include "hb.h"
+#include "hb-ot.h"
+
+#ifdef HAVE_FREETYPE
+#include "hb-ft.h"
+#endif
+
+#ifdef HB_NO_OPEN
+#define hb_blob_create_from_file_or_fail(x)  hb_blob_get_empty ()
+#endif
+
+int
+main (int argc, char **argv)
+{
+  if (argc != 4 && argc != 5) {
+    fprintf (stderr, "usage: %s font-file lookup-index first-glyph [second-glyph]\n", argv[0]);
+    exit (1);
+  }
+
+  /* Create the face */
+  hb_blob_t *blob = hb_blob_create_from_file_or_fail (argv[1]);
+  assert (blob);
+  hb_face_t *face = hb_face_create (blob, 0 /* first face */);
+  hb_blob_destroy (blob);
+  blob = nullptr;
+
+  hb_font_t *font = hb_font_create (face);
+#ifdef HAVE_FREETYPE
+  hb_ft_font_set_funcs (font);
+#endif
+
+  unsigned int len = argc - 3;
+  hb_codepoint_t glyphs[2];
+  if (!hb_font_glyph_from_string (font, argv[3], -1, &glyphs[0]) ||
+      (argc > 4 &&
+       !hb_font_glyph_from_string (font, argv[4], -1, &glyphs[1])))
+    return 2;
+  return !hb_ot_layout_lookup_would_substitute (face, strtol (argv[2], nullptr, 0), glyphs, len, false);
+}