text: // Copyright (c) 2011-2016 The Cryptonote developers
  // Copyright (c) 2014-2016 SDN developers
  // Distributed under the MIT/X11 software license, see the accompanying
  // file COPYING or http://www.opensource.org/licenses/mit-license.php.
  
  #include <cstdint>
  #include <cstdlib>
  #include <cstring>
  #include <limits>
  #include "crypto/hash.h"
  #include "CryptoNoteCore/Difficulty.h"
  
  using namespace std;
  using CryptoNote::check_hash;
  
  int main(int argc, char *argv[]) {
    Crypto::Hash h;
    for (uint64_t diff = 1;; diff += 1 + (diff >> 8)) {
      for (int b = 0; b < 256; b++) {
        memset(&h, b, sizeof(Crypto::Hash));
        if (check_hash(h, diff) != (b == 0 || diff <= 255 / b)) {
          return 1;
        }
        if (b > 0) {
          memset(&h, 0, sizeof(Crypto::Hash));
          ((char *) &h)[31] = b;
          if (check_hash(h, diff) != (diff <= 255 / b)) {
            return 1;
          }
        }
      }
      if (diff < numeric_limits<uint64_t>::max() / 256) {
        uint64_t val = 0;
        for (int i = 31; i >= 0; i--) {
          val = val * 256 + 255;
          ((char *) &h)[i] = static_cast<char>(val / diff);
          val %= diff;
        }
        if (check_hash(h, diff) != true) {
          return 1;
        }
        if (diff > 1) {
          for (int i = 0;; i++) {
            if (i >= 32) {
              abort();
            }
            if (++((char *) &h)[i] != 0) {
              break;
            }
          }
          if (check_hash(h, diff) != false) {
            return 1;
          }
        }
      }
      if (diff + 1 + (diff >> 8) < diff) {
        break;
      }
    }
    return 0;
  }
  