testing/libfuzzer/fuzzers/language_detection_fuzzer.cc

// Copyright (c) 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include <stdint.h>
#include <string>

#include "base/strings/string16.h"
#include "base/strings/utf_string_conversions.h"
#include "components/translate/core/language_detection/language_detection_util.h"

// Entry point for LibFuzzer.
extern "C" int LLVMFuzzerTestOneInput(const unsigned char* data, size_t size) {
  if (size == 0) {
    return 0;
  }
  uint8_t ch = data[0];
  int lang_len = ch & 0xF;
  int html_lang_len = (ch >> 4) & 0xF;
  int text_len = static_cast<int>(size) - lang_len - html_lang_len;
  if ((text_len < 0) || (text_len % 2 != 0)) {
    return 0;
  }
  std::string lang(reinterpret_cast<const char*>(data), lang_len);
  std::string html_lang(reinterpret_cast<const char*>(data + lang_len),
                        html_lang_len);
  base::string16 text(
      reinterpret_cast<const base::char16*>(data + lang_len + html_lang_len),
      text_len / 2);
  std::string cld_lang;
  bool is_cld_reliable;
  translate::DeterminePageLanguage(lang, html_lang, text, &cld_lang,
                                   &is_cld_reliable);
  return 0;
}