text: // Copyright (c) 2014-2016, The Monero Project
  // 
  // All rights reserved.
  // 
  // Redistribution and use in source and binary forms, with or without modification, are
  // permitted provided that the following conditions are met:
  // 
  // 1. Redistributions of source code must retain the above copyright notice, this list of
  //    conditions and the following disclaimer.
  // 
  // 2. Redistributions in binary form must reproduce the above copyright notice, this list
  //    of conditions and the following disclaimer in the documentation and/or other
  //    materials provided with the distribution.
  // 
  // 3. Neither the name of the copyright holder nor the names of its contributors may be
  //    used to endorse or promote products derived from this software without specific
  //    prior written permission.
  // 
  // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
  // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
  // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
  // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
  // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
  // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  // 
  // Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers
  
  #include <cstddef>
  #include <cstdint>
  #include <fstream>
  #include <iostream>
  #include <vector>
  #include <algorithm>
  
  #include "cryptonote_config.h"
  #include "cryptonote_basic/difficulty.h"
  
  using namespace std;
  
  #define DEFAULT_TEST_DIFFICULTY_TARGET        120
  
  int main(int argc, char *argv[]) {
      if (argc != 2) {
          cerr << "Wrong arguments" << endl;
          return 1;
      }
      vector<uint64_t> timestamps, cumulative_difficulties;
      fstream data(argv[1], fstream::in);
      data.exceptions(fstream::badbit);
      data.clear(data.rdstate());
      uint64_t timestamp, difficulty, cumulative_difficulty = 0;
      size_t n = 0;
      while (data >> timestamp >> difficulty) {
          size_t begin, end;
          if (n < DIFFICULTY_WINDOW + DIFFICULTY_LAG) {
              begin = 0;
              end = min(n, (size_t) DIFFICULTY_WINDOW);
          } else {
              end = n - DIFFICULTY_LAG;
              begin = end - DIFFICULTY_WINDOW;
          }
          uint64_t res = cryptonote::next_difficulty(
              vector<uint64_t>(timestamps.begin() + begin, timestamps.begin() + end),
              vector<uint64_t>(cumulative_difficulties.begin() + begin, cumulative_difficulties.begin() + end), DEFAULT_TEST_DIFFICULTY_TARGET);
          if (res != difficulty) {
              cerr << "Wrong difficulty for block " << n << endl
                  << "Expected: " << difficulty << endl
                  << "Found: " << res << endl;
              return 1;
          }
          timestamps.push_back(timestamp);
          cumulative_difficulties.push_back(cumulative_difficulty += difficulty);
          ++n;
      }
      if (!data.eof()) {
          data.clear(fstream::badbit);
      }
      return 0;
  }
  