tmp2

#include <fstream>
#include <iostream>
#include <string>
#include <vector>
#include <boost/asio.hpp>

using boost::asio::ip::tcp;

// Function to calculate file's MD5 hash... (Your implementation here)

void send_file(tcp::socket& socket, const std::string& file_name) {
    std::ifstream file(file_name, std::ios::binary);

    // Check if the file was opened successfully.
    if (!file.is_open() || file.fail()) {
        std::cerr << "Failed to open the file.\n";
        return;
    }

    // Get the file size.
    file.seekg(0, std::ios::end);
    std::streamsize size = file.tellg();
    file.seekg(0, std::ios::beg);

    // Read file into memory.
    std::vector<char> file_data(size);
    if (!file.read(file_data.data(), size)) {
        std::cerr << "Failed to read the file.\n";
        return;
    }

    // Calculate the MD5 of the file.
    std::string md5 = get_file_md5(file_name);
    std::cout << "MD5 of the file to be sent: " << md5 << std::endl;
    std::cout << "Size of the file to be sent: " << size << " bytes\n";

    // Send the MD5 to the client.
    boost::asio::write(socket, boost::asio::buffer(md5));

    // Then send the file data.
    std::size_t written = boost::asio::write(socket, boost::asio::buffer(file_data));

    std::cout << "Written bytes: " << written << "\n";
}