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//
// transmit_file.cpp
// ~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2010 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;
// 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_io_service(), handler);
// Initiate the TransmitFile operation.
BOOL ok = ::TransmitFile(socket.native(),
file.native(), 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_service.
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_service.
overlapped.release();
}
}
class connection
: public boost::enable_shared_from_this<connection>
{
public:
typedef boost::shared_ptr<connection> pointer;
static pointer create(boost::asio::io_service& io_service,
const std::string& filename)
{
return pointer(new connection(io_service, 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_service& io_service, const std::string& filename)
: socket_(io_service),
filename_(filename),
file_(io_service)
{
}
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_service& io_service,
unsigned short port, const std::string& filename)
: acceptor_(io_service, tcp::endpoint(tcp::v4(), port)),
filename_(filename)
{
start_accept();
}
private:
void start_accept()
{
connection::pointer new_connection =
connection::create(acceptor_.io_service(), 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_service io_service;
using namespace std; // For atoi.
server s(io_service, atoi(argv[1]), argv[2]);
io_service.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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