fuzzers/suggestions_fuzzer.cc

#include <fuzzer/FuzzedDataProvider.h>

#include <array>
#include <string>

#include "base/commandlineflags.h"
#include "devtools/build/runtime/get_runfiles_dir.h"
#include "third_party/absl/strings/str_cat.h"
#include "third_party/absl/strings/string_view.h"
#include "third_party/hunspell/src/hunspell/hunspell.hxx"

DEFINE_string(hunspell_dicts_dir, "/dicts",
              "Directory containing the dictionary for the specified language");
// Note: moved English first to make the conversion of existing crash samples
// easier.
static const char *kLanguages[] = {
    "en", "af", "an", "ar", "bg", "ca", "cs", "da", "de", "el", "eo",
    "es", "et", "eu", "fa", "fi", "fo", "fr", "ga", "gd", "gl", "gv",
    "he", "hr", "hu", "hy", "it", "kk", "ko", "ku", "lt", "lv", "ml",
    "nb", "ne", "nl", "nn", "no", "pl", "pt", "ro", "ru", "se", "sh",
    "sk", "sl", "sr", "sv", "sw", "th", "tl", "uz", "vi"};

static Hunspell *CreateHunspell(absl::string_view language) {
  std::string common_path =
      absl::StrCat(devtools_build::GetRunfilesDir(), "/",
                   FLAGS_hunspell_dicts_dir, "/", language);
  std::string affix_filepath(common_path + ".aff");
  std::string dic_filepath(common_path + ".dic");
  fprintf(stderr, "Hunspell(%s,%s)\n", affix_filepath.c_str(),
          dic_filepath.c_str());
  return new Hunspell(affix_filepath.c_str(), dic_filepath.c_str());
}

extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
  FuzzedDataProvider fdp(data, size);
  static Hunspell *hunspell = CreateHunspell(fdp.PickValueInArray(kLanguages));

  std::string s = fdp.ConsumeRemainingBytesAsString();
  hunspell->spell(s.c_str());

  // Search suggestions
  char **suggestions = nullptr;
  int suggestions_len = hunspell->suggest(&suggestions, s.c_str());
  hunspell->free_list(&suggestions, suggestions_len);

  // Morphological analysis
  char **results = nullptr;
  suggestions_len = hunspell->analyze(&suggestions, s.c_str());
  int results_len = hunspell->stem(&results, suggestions, suggestions_len);
  hunspell->free_list(&suggestions, suggestions_len);
  hunspell->free_list(&results, results_len);

  return 0;
}