compiler-rt/test/fuzzer/EquivalenceBTest.cpp

// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
#include <stddef.h>
#include <stdint.h>
#include <stdio.h>

// Test for libFuzzer's "equivalence" fuzzing, part B.
extern "C" void LLVMFuzzerAnnounceOutput(const uint8_t *Data, size_t Size);
extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  // fprintf(stderr, "B %zd\n", Size);
  uint8_t Result[50];
  if (Size > 50) Size = 50;
  for (size_t i = 0; i < Size; i++)
    Result[Size - i - 1] = Data[i];

  // Be a bit different from EquivalenceATest
  if (Size > 10 && Data[5] == 'B' && Data[6] == 'C' && Data[7] == 'D') {
    static int c;
    if (!c)
      fprintf(stderr, "ZZZZZZZ\n");
    c = 1;
    Result[2]++;
  }

  LLVMFuzzerAnnounceOutput(Result, Size);
  return 0;
}