Подскажите библиотеку или может готовую функцию для копирования

#include <iostream>
#include <copyfile.h>
#include <sys/stat.h>
 
using namespace std;
 
int copy_callback(int what, int stage, copyfile_state_t state, const char *src, const char *dst, void *ctx) {
    off_t bcount;
    struct stat *st = (struct stat *) ctx;
    copyfile_state_get(state, COPYFILE_STATE_COPIED, &bcount);
    cout << src << ": " << bcount << " bytes copied. "
         << (size_t) ((bcount / (double) st->st_size) * 100.0) << "%" << endl;
    return COPYFILE_CONTINUE;
}
 
int main()
{
    const char *from = "vbox/Debian/Debian.vdi";
    struct stat st;
 
    stat(from, &st);
 
    cout << st.st_size << endl;
 
    copyfile_state_t state = copyfile_state_alloc();
 
    copyfile_state_set(state, COPYFILE_STATE_STATUS_CB, (const void *) &copy_callback);
    copyfile_state_set(state, COPYFILE_STATE_STATUS_CTX, (const void *) &st);
 
    if (copyfile(from, "fileto", state, COPYFILE_ALL) != 0) {
        cerr << "copy failed" << endl;
    }
 
    copyfile_state_free(state);
 
    return 0;
}