#include <algorithm>
#include <array>
#include <cassert>
#include <cstdint>
#include <cstring>
#include <exception>
#include <fstream>
#include <iostream>
#include <string>
#include <vector>
#include <iterator>


int main(int argc, char **argv) {
  const std::string &file_path = argv[1];
  const std::string out_path = argv[2];
  std::ifstream in_file;
  in_file.open(file_path, std::ifstream::binary);
  in_file.seekg(0, std::ios::end);
  int16_t sampleSize = in_file.tellg();
  in_file.seekg(0, in_file.beg);
  /* Length of wav file*/
  std::vector<int16_t>samples(sampleSize);
  std::vector<int16_t>dataSize(sampleSize * 2);
  /*Outfile */
  std::ofstream out_file;
  out_file.open(out_path, std::ios_base::binary);
  /* Read in the header information and Data Size information */
  in_file.read(reinterpret_cast<char *>(samples.data()), 44);
  in_file.read(reinterpret_cast<char *>(dataSize.data()), sampleSize);
  /* Output file */
  out_file.write(reinterpret_cast<char *>(samples.data()), 44);
  std::reverse(std::begin(dataSize), std::end(dataSize));
  out_file.write(reinterpret_cast<char *>(dataSize.data()), sampleSize);
return 0;
}