text: // Copyright (c) 2019, 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.
  
  #include <stdint.h>
  #include <stddef.h>
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <errno.h>
  #include "crypto/hash-ops.h"
  
  extern volatile int use_v4_jit_flag;
  
  static int test(const uint8_t *data, size_t len, uint64_t height)
  {
    char hash0[32], hash1[32];
    use_v4_jit_flag = 0;
    cn_slow_hash(data, len, hash0, 4, 0, height);
    use_v4_jit_flag = 1;
    cn_slow_hash(data, len, hash1, 4, 0, height);
    return memcmp(hash0, hash1, 32);
  }
  
  int main(int argc, char **argv)
  {
    uint8_t data[64];
    uint64_t start_height = 1788000;
    uint64_t end_height = 1788001;
  
    if (argc != 1 && argc != 2 && argc != 3)
    {
      fprintf(stderr, "usage: %s [<start_height> [<end_height>]]\n", argv[0]);
      return 1;
    }
    if (argc > 1)
    {
      errno = 0;
      start_height = strtoull(argv[1], NULL, 10);
      if ((start_height == 0 && errno) || start_height == ULLONG_MAX)
      {
        fprintf(stderr, "invalid start_height\n");
        return 1;
      }
      end_height = start_height;
      if (argc > 2)
      {
        errno = 0;
        end_height = strtoull(argv[2], NULL, 10);
        if ((end_height == 0 && errno) || end_height == ULLONG_MAX)
        {
          fprintf(stderr, "invalid end_height\n");
          return 1;
        }
      }
    }
  
    if (start_height == end_height)
    {
      uint64_t counter = 0;
      while (1)
      {
        printf("\r%llu", (unsigned long long)counter);
        fflush(stdout);
        size_t offset = 0;
        while (offset + 8 < sizeof(data))
        {
          memcpy(data + offset, &counter, sizeof(counter));
          offset += 8;
        }
        if (test(data, sizeof(data), start_height))
        {
          fprintf(stderr, "\nFailure at height %llu, counter %llu\n", (unsigned long long)start_height, (unsigned long long)counter);
          return 0;
        }
        ++counter;
      }
    }
  
    memset(data, 0x42, sizeof(data));
    for (uint64_t h = start_height; h < end_height; ++h)
    {
      printf("\r%llu/%llu", (unsigned long long)(h-start_height), (unsigned long long)(end_height-start_height));
      fflush(stdout);
      if (test(data, sizeof(data), h))
      {
        fprintf(stderr, "\nFailure at height %llu\n", (unsigned long long)h);
        return 0;
      }
    }
  
    printf("\r");
  
    return 0;
  }
  