compiler-rt/test/fuzzer/EquivalenceBTest.cpp

   1 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   2 // See https://llvm.org/LICENSE.txt for license information.
   3 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   4 #include <stddef.h>
   5 #include <stdint.h>
   6 #include <stdio.h>
   7
   8 // Test for libFuzzer's "equivalence" fuzzing, part B.
   9 extern "C" void LLVMFuzzerAnnounceOutput(const uint8_t *Data, size_t Size);
  10 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *Data, size_t Size) {
  11   // fprintf(stderr, "B %zd\n", Size);
  12   uint8_t Result[50];
  13   if (Size > 50) Size = 50;
  14   for (size_t i = 0; i < Size; i++)
  15     Result[Size - i - 1] = Data[i];
  16
  17   // Be a bit different from EquivalenceATest
  18   if (Size > 10 && Data[5] == 'B' && Data[6] == 'C' && Data[7] == 'D') {
  19     static int c;
  20     if (!c)
  21       fprintf(stderr, "ZZZZZZZ\n");
  22     c = 1;
  23     Result[2]++;
  24   }
  25
  26   LLVMFuzzerAnnounceOutput(Result, Size);
  27   return 0;
  28 }