Add fuzzing harness for g_utf8_normalize()

fuzzing/fuzz_utf8_normalize.c

@@ -0,0 +1,48 @@
+/*
+ * Copyright 2023 Todd Carson
+ *
+ * SPDX-License-Identifier: LGPL-2.1-or-later
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * This library is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with this library; if not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include "fuzz.h"
+
+int
+LLVMFuzzerTestOneInput (const unsigned char *data, size_t size)
+{
+  char *bounded, *terminated, *buf;
+
+  fuzz_set_logging_func ();
+
+  buf = g_malloc (size + 1);
+  memcpy (buf, data, size);
+  buf[size] = '\0';
+
+  terminated = g_utf8_normalize (buf, -1, G_NORMALIZE_ALL);
+  g_free (buf);
+
+  bounded = g_utf8_normalize ((const char *) data, size, G_NORMALIZE_ALL);
+
+  if (terminated && bounded)
+    {
+      g_assert (strcmp (terminated, bounded) == 0);
+      g_free (terminated);
+      g_free (bounded);
+    }
+  else
+    g_assert (!(terminated || bounded));
+
+  return 0;
+}

fuzzing/meson.build

@@ -33,6 +33,7 @@ fuzz_targets = [
   'fuzz_uri_escape',
   'fuzz_uri_parse',
   'fuzz_uri_parse_params',
+  'fuzz_utf8_normalize',
   'fuzz_utf8_validate',
   'fuzz_uuid_string_is_valid',
   'fuzz_variant_binary',