fuzzing: Add fuzz tests for GUri parsing and escaping

Signed-off-by: Philip Withnall <withnall@endlessm.com>

Helps: #110

fuzzing/fuzz_uri_escape.c

@@ -0,0 +1,29 @@
+#include "fuzz.h"
+
+int
+LLVMFuzzerTestOneInput (const unsigned char *data, size_t size)
+{
+  GBytes *unescaped_bytes = NULL;
+  gchar *escaped_string = NULL;
+
+  fuzz_set_logging_func ();
+
+  if (size > G_MAXSSIZE)
+    return 0;
+
+  unescaped_bytes = g_uri_unescape_bytes ((const gchar *) data, (gssize) size);
+  if (unescaped_bytes == NULL)
+    return 0;
+
+  escaped_string = g_uri_escape_bytes (g_bytes_get_data (unescaped_bytes, NULL),
+                                       g_bytes_get_size (unescaped_bytes),
+                                       NULL);
+  g_bytes_unref (unescaped_bytes);
+
+  if (escaped_string == NULL)
+    return 0;
+
+  g_free (escaped_string);
+
+  return 0;
+}