Function LLVMFuzzerTestOneInput

extern/re2/re2/fuzzing/re2_fuzzer.cc:136–171

// Entry point for libFuzzer.
extern "C" int LLVMFuzzerTestOneInput(const uint8_t* data, size_t size) {
  // An input larger than 4 KiB probably isn't interesting. (This limit
  // allows for fdp.ConsumeRandomLengthString()'s backslash behaviour.)
  if (size == 0 || size > 4096)
    return 0;

  FuzzedDataProvider fdp(data, size);

  // The convention here is that fdp.ConsumeBool() returning false sets
  // the default value whereas returning true sets the alternate value:
  // most options default to false and so can be set directly; encoding
  // defaults to UTF-8; case_sensitive defaults to true. We do NOT want
  // to log errors. max_mem is 64 MiB because we can afford to use more
  // RAM in exchange for (hopefully) faster fuzzing.
  RE2::Options options;
  options.set_encoding(fdp.ConsumeBool() ? RE2::Options::EncodingLatin1
                                         : RE2::Options::EncodingUTF8);
  options.set_posix_syntax(fdp.ConsumeBool());
  options.set_longest_match(fdp.ConsumeBool());
  options.set_log_errors(false);
  options.set_max_mem(64 << 20);
  options.set_literal(fdp.ConsumeBool());
  options.set_never_nl(fdp.ConsumeBool());
  options.set_dot_nl(fdp.ConsumeBool());
  options.set_never_capture(fdp.ConsumeBool());
  options.set_case_sensitive(!fdp.ConsumeBool());
  options.set_perl_classes(fdp.ConsumeBool());
  options.set_word_boundary(fdp.ConsumeBool());
  options.set_one_line(fdp.ConsumeBool());

  std::string pattern = fdp.ConsumeRandomLengthString(999);
  std::string text = fdp.ConsumeRandomLengthString(999);

  TestOneInput(pattern, options, text);
  return 0;
}