--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mupdf-source/thirdparty/harfbuzz/src/failing-alloc.c	Mon Sep 15 11:43:07 2025 +0200
@@ -0,0 +1,65 @@
+/*
+ * Copyright © 2020  Ebrahim Byagowi
+ *
+ *  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.
+ */
+
+#include <stdlib.h>
+#include <stdio.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+int alloc_state = 0;
+
+__attribute__((no_sanitize("integer")))
+static int fastrand ()
+{
+  if (!alloc_state) return 1;
+  /* Based on https://software.intel.com/content/www/us/en/develop/articles/fast-random-number-generator-on-the-intel-pentiumr-4-processor.html */
+  alloc_state = (214013 * alloc_state + 2531011);
+  return (alloc_state >> 16) & 0x7FFF;
+}
+
+void* hb_malloc_impl (size_t size)
+{
+  return (fastrand () % 16) ? malloc (size) : NULL;
+}
+
+void* hb_calloc_impl (size_t nmemb, size_t size)
+{
+  return (fastrand () % 16) ? calloc (nmemb, size) : NULL;
+}
+
+void* hb_realloc_impl (void *ptr, size_t size)
+{
+  return (fastrand () % 16) ? realloc (ptr, size) : NULL;
+}
+
+void  hb_free_impl (void *ptr)
+{
+  return free (ptr);
+}
+
+#ifdef __cplusplus
+}
+#endif