[libFuzzer] add a tiny and surprisingly hard puzzle

llvm-svn: 336229

compiler-rt/test/fuzzer/ThreeBytes.cpp

@@ -0,0 +1,14 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+// Find FUZ
+#include <cstddef>
+#include <cstdint>
+#include <cstdlib>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  if (Size < 3) return 0;
+  uint32_t x = Data[0] + 251 * Data[1] + 251 * 251 * Data[2];
+  if (x == 'F' + 251 * 'U' + 251 * 251 * 'Z')     abort();
+  return 0;
+}