1 files changed, 31 insertions, 0 deletions
diff --git a/test/fuzzer/RepeatedBytesTest.cpp b/test/fuzzer/RepeatedBytesTest.cpp
new file mode 100644
index 0000000000000..31868cf8c540a
--- /dev/null
+++ b/test/fuzzer/RepeatedBytesTest.cpp
@@ -0,0 +1,31 @@
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+
+// Simple test for a fuzzer. The fuzzer must find repeated bytes.
+#include <assert.h>
+#include <cstddef>
+#include <cstdint>
+#include <cstdlib>
+#include <iostream>
+#include <ostream>
+
+extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
+  assert(Data);
+  // Looking for AAAAAAAAAAAAAAAAAAAAAA or some such.
+  size_t CurA = 0, MaxA = 0;
+  for (size_t i = 0; i < Size; i++) {
+    // Make sure there are no conditionals in the loop so that
+    // coverage can't help the fuzzer.
+    int EQ = Data[i] == 'A';
+    CurA = EQ * (CurA + 1);
+    int GT = CurA > MaxA;
+    MaxA = GT * CurA + (!GT) * MaxA;
+  }
+  if (MaxA >= 20) {
+    std::cout << "BINGO; Found the target (Max: " << MaxA << "), exiting\n"
+              << std::flush;
+    exit(0);
+  }
+  return 0;
+}
+