Example: io_compress_example

C++ example source code:

/* +------------------------------------------------------------------------+
   |                     Mobile Robot Programming Toolkit (MRPT)            |
   |                          https://www.mrpt.org/                         |
   |                                                                        |
   | Copyright (c) 2005-2021, Individual contributors, see AUTHORS file     |
   | See: https://www.mrpt.org/Authors - All rights reserved.               |
   | Released under BSD License. See: https://www.mrpt.org/License          |
   +------------------------------------------------------------------------+ */

#include <mrpt/core/exceptions.h>
#include <mrpt/core/format.h>
#include <mrpt/io/vector_loadsave.h>
#include <mrpt/io/zip.h>
#include <mrpt/system/CTicTac.h>

#include <cstdio>
#include <iostream>

using namespace mrpt;
using namespace std;

// ------------------------------------------------------
//                      MAIN
// ------------------------------------------------------
int main(int argc, char** argv)
{
    try
    {
        if (argc < 2)
        {
            cerr << "Usage: test-compress <input_file> [compression level 1-9]"
                 << endl;
            return -1;
        }

        std::vector<uint8_t> buf;

        if (!mrpt::io::loadBinaryFile(buf, argv[1]))
        {
            cerr << "Error loading file: " << argv[1] << endl;
            return -1;
        }

        string gzfile = format("%s.gz", argv[1]);
        int compress_level = 9;
        if (argc >= 3) { compress_level = atoi(argv[2]); }
        mrpt::system::CTicTac tictac;

        tictac.Tic();

        if (!mrpt::io::zip::compress_gz_file(gzfile, buf, compress_level))
        {
            cerr << "Error writing compressing file: " << gzfile << endl;
            return -1;
        }

        double t = tictac.Tac();
        cout << format(
                    "Compressed %s (compress level=%i) in %.04f seconds.",
                    gzfile.c_str(), compress_level, t)
             << endl;

        return 0;
    }
    catch (const std::exception& e)
    {
        std::cerr << "MRPT error: " << mrpt::exception_to_str(e) << std::endl;
        return -1;
    }
}