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- //
- // transmit_file.cpp
- // ~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
- //
- // Distributed under the Boost Software License, Version 1.0. (See accompanying
- // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
- //
- #include <ctime>
- #include <iostream>
- #include <string>
- #include <boost/bind.hpp>
- #include <boost/shared_ptr.hpp>
- #include <boost/enable_shared_from_this.hpp>
- #include <boost/asio.hpp>
- #if defined(BOOST_ASIO_HAS_WINDOWS_OVERLAPPED_PTR)
- using boost::asio::ip::tcp;
- using boost::asio::windows::overlapped_ptr;
- using boost::asio::windows::random_access_handle;
- typedef boost::asio::basic_stream_socket<tcp,
- boost::asio::io_context::executor_type> tcp_socket;
- typedef boost::asio::basic_socket_acceptor<tcp,
- boost::asio::io_context::executor_type> tcp_acceptor;
- // A wrapper for the TransmitFile overlapped I/O operation.
- template <typename Handler>
- void transmit_file(tcp_socket& socket,
- random_access_handle& file, Handler handler)
- {
- // Construct an OVERLAPPED-derived object to contain the handler.
- overlapped_ptr overlapped(socket.get_executor().context(), handler);
- // Initiate the TransmitFile operation.
- BOOL ok = ::TransmitFile(socket.native_handle(),
- file.native_handle(), 0, 0, overlapped.get(), 0, 0);
- DWORD last_error = ::GetLastError();
- // Check if the operation completed immediately.
- if (!ok && last_error != ERROR_IO_PENDING)
- {
- // The operation completed immediately, so a completion notification needs
- // to be posted. When complete() is called, ownership of the OVERLAPPED-
- // derived object passes to the io_context.
- boost::system::error_code ec(last_error,
- boost::asio::error::get_system_category());
- overlapped.complete(ec, 0);
- }
- else
- {
- // The operation was successfully initiated, so ownership of the
- // OVERLAPPED-derived object has passed to the io_context.
- overlapped.release();
- }
- }
- class connection
- : public boost::enable_shared_from_this<connection>
- {
- public:
- typedef boost::shared_ptr<connection> pointer;
- static pointer create(boost::asio::io_context& io_context,
- const std::string& filename)
- {
- return pointer(new connection(io_context, filename));
- }
- tcp_socket& socket()
- {
- return socket_;
- }
- void start()
- {
- boost::system::error_code ec;
- file_.assign(::CreateFile(filename_.c_str(), GENERIC_READ, 0, 0,
- OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, 0), ec);
- if (file_.is_open())
- {
- transmit_file(socket_, file_,
- boost::bind(&connection::handle_write, shared_from_this(),
- boost::asio::placeholders::error,
- boost::asio::placeholders::bytes_transferred));
- }
- }
- private:
- connection(boost::asio::io_context& io_context, const std::string& filename)
- : socket_(io_context),
- filename_(filename),
- file_(io_context)
- {
- }
- void handle_write(const boost::system::error_code& /*error*/,
- size_t /*bytes_transferred*/)
- {
- boost::system::error_code ignored_ec;
- socket_.shutdown(tcp_socket::shutdown_both, ignored_ec);
- }
- tcp_socket socket_;
- std::string filename_;
- random_access_handle file_;
- };
- class server
- {
- public:
- server(boost::asio::io_context& io_context,
- unsigned short port, const std::string& filename)
- : acceptor_(io_context, tcp::endpoint(tcp::v4(), port)),
- filename_(filename)
- {
- start_accept();
- }
- private:
- void start_accept()
- {
- connection::pointer new_connection =
- connection::create(acceptor_.get_executor().context(), filename_);
- acceptor_.async_accept(new_connection->socket(),
- boost::bind(&server::handle_accept, this, new_connection,
- boost::asio::placeholders::error));
- }
- void handle_accept(connection::pointer new_connection,
- const boost::system::error_code& error)
- {
- if (!error)
- {
- new_connection->start();
- }
- start_accept();
- }
- tcp_acceptor acceptor_;
- std::string filename_;
- };
- int main(int argc, char* argv[])
- {
- try
- {
- if (argc != 3)
- {
- std::cerr << "Usage: transmit_file <port> <filename>\n";
- return 1;
- }
- boost::asio::io_context io_context;
- using namespace std; // For atoi.
- server s(io_context, atoi(argv[1]), argv[2]);
- io_context.run();
- }
- catch (std::exception& e)
- {
- std::cerr << e.what() << std::endl;
- }
- return 0;
- }
- #else // defined(BOOST_ASIO_HAS_WINDOWS_OVERLAPPED_PTR)
- # error Overlapped I/O not available on this platform
- #endif // defined(BOOST_ASIO_HAS_WINDOWS_OVERLAPPED_PTR)
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