// ***************************************************************** -*- C++ -*-

// mmap-test.cpp

// Simple mmap tests

#include <exiv2/exiv2.hpp>

#include <iostream>

#include <cstring>

using namespace Exiv2;

int main(int argc, char* const argv[])

try {

    if (argc != 2) {

        std::cout << "Usage: " << argv[0] << " file\n";

        return 1;

    }

    const char* path = argv[1];

    FileIo file(path);

    // Open the file in read mode

    if (file.open("rb") != 0) {

        throw Error(kerFileOpenFailed, path, "rb", strError());

    }

    // Map it to memory

    const Exiv2::byte* pData = file.mmap();

    long size = (long)file.size();

    DataBuf buf(size);

    // Read from the memory mapped region

    memcpy(buf.pData_, pData, buf.size_);

    // Reopen file in write mode and write to it

    file.write(buf.pData_, buf.size_);

    // Read from the mapped region again

    memcpy(buf.pData_, pData, buf.size_);

    file.close();

    return 0;

}

catch (const AnyError& e) {

    std::cout << e << "\n";

}