Конвертировать файл в 10-ю систему счисления и обратно

#include <algorithm>
#include <fstream>
#include <iostream>
#include <iterator>
#include <vector>
 
std::vector<char> deconvert_from_bin(const char* filename)
{
    std::ifstream ifs(filename, std::ios::binary);
    std::vector<char> vec (
        (std::istreambuf_iterator<char>(ifs)),
        (std::istreambuf_iterator<char>()));
    return vec;
}
 
void convert_to_dec(const std::vector<char>& vec, const char* filename)
{
    std::ofstream ofs(filename);
    std::copy(vec.begin(), vec.end(), std::ostream_iterator<int>(ofs, "\n"));
}
 
std::vector<char> deconvert_from_dec(const char* filename)
{
    std::ifstream ifs(filename);
    std::vector<char> vec;
    int num;
    while (!ifs.eof())
    {
        ifs >> num;
        vec.push_back((char)num);
    }
    return vec;
}
 
void convert_to_bin(const std::vector<char>& vec, const char* filename)
{
    std::ofstream ofs(filename, std::ios::binary);
    std::copy(vec.begin(), vec.end(), std::ostream_iterator<char>(ofs));
}
 
int main()
{
    const char* filename = "C:\\1.txt";
    std::vector<char> vec = deconvert_from_bin("C:\\appbar.acorn.png");
    convert_to_dec(vec, filename);
    vec = deconvert_from_dec(filename);
    convert_to_bin(vec, "C:\\test.png");
    return 0;
}