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1 | // |
2 | // transmit_file.cpp | |
3 | // ~~~~~~~~~~~~~~~~~ | |
4 | // | |
11fdf7f2 | 5 | // Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com) |
7c673cae FG |
6 | // |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | ||
11 | #include <ctime> | |
12 | #include <iostream> | |
13 | #include <string> | |
14 | #include <boost/bind.hpp> | |
15 | #include <boost/shared_ptr.hpp> | |
16 | #include <boost/enable_shared_from_this.hpp> | |
17 | #include <boost/asio.hpp> | |
18 | ||
19 | #if defined(BOOST_ASIO_HAS_WINDOWS_OVERLAPPED_PTR) | |
20 | ||
21 | using boost::asio::ip::tcp; | |
22 | using boost::asio::windows::overlapped_ptr; | |
23 | using boost::asio::windows::random_access_handle; | |
24 | ||
25 | // A wrapper for the TransmitFile overlapped I/O operation. | |
26 | template <typename Handler> | |
27 | void transmit_file(tcp::socket& socket, | |
28 | random_access_handle& file, Handler handler) | |
29 | { | |
30 | // Construct an OVERLAPPED-derived object to contain the handler. | |
b32b8144 | 31 | overlapped_ptr overlapped(socket.get_executor().context(), handler); |
7c673cae FG |
32 | |
33 | // Initiate the TransmitFile operation. | |
34 | BOOL ok = ::TransmitFile(socket.native_handle(), | |
35 | file.native_handle(), 0, 0, overlapped.get(), 0, 0); | |
36 | DWORD last_error = ::GetLastError(); | |
37 | ||
38 | // Check if the operation completed immediately. | |
39 | if (!ok && last_error != ERROR_IO_PENDING) | |
40 | { | |
41 | // The operation completed immediately, so a completion notification needs | |
42 | // to be posted. When complete() is called, ownership of the OVERLAPPED- | |
b32b8144 | 43 | // derived object passes to the io_context. |
7c673cae FG |
44 | boost::system::error_code ec(last_error, |
45 | boost::asio::error::get_system_category()); | |
46 | overlapped.complete(ec, 0); | |
47 | } | |
48 | else | |
49 | { | |
50 | // The operation was successfully initiated, so ownership of the | |
b32b8144 | 51 | // OVERLAPPED-derived object has passed to the io_context. |
7c673cae FG |
52 | overlapped.release(); |
53 | } | |
54 | } | |
55 | ||
56 | class connection | |
57 | : public boost::enable_shared_from_this<connection> | |
58 | { | |
59 | public: | |
60 | typedef boost::shared_ptr<connection> pointer; | |
61 | ||
b32b8144 | 62 | static pointer create(boost::asio::io_context& io_context, |
7c673cae FG |
63 | const std::string& filename) |
64 | { | |
b32b8144 | 65 | return pointer(new connection(io_context, filename)); |
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66 | } |
67 | ||
68 | tcp::socket& socket() | |
69 | { | |
70 | return socket_; | |
71 | } | |
72 | ||
73 | void start() | |
74 | { | |
75 | boost::system::error_code ec; | |
76 | file_.assign(::CreateFile(filename_.c_str(), GENERIC_READ, 0, 0, | |
77 | OPEN_ALWAYS, FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED, 0), ec); | |
78 | if (file_.is_open()) | |
79 | { | |
80 | transmit_file(socket_, file_, | |
81 | boost::bind(&connection::handle_write, shared_from_this(), | |
82 | boost::asio::placeholders::error, | |
83 | boost::asio::placeholders::bytes_transferred)); | |
84 | } | |
85 | } | |
86 | ||
87 | private: | |
b32b8144 FG |
88 | connection(boost::asio::io_context& io_context, const std::string& filename) |
89 | : socket_(io_context), | |
7c673cae | 90 | filename_(filename), |
b32b8144 | 91 | file_(io_context) |
7c673cae FG |
92 | { |
93 | } | |
94 | ||
95 | void handle_write(const boost::system::error_code& /*error*/, | |
96 | size_t /*bytes_transferred*/) | |
97 | { | |
98 | boost::system::error_code ignored_ec; | |
99 | socket_.shutdown(tcp::socket::shutdown_both, ignored_ec); | |
100 | } | |
101 | ||
102 | tcp::socket socket_; | |
103 | std::string filename_; | |
104 | random_access_handle file_; | |
105 | }; | |
106 | ||
107 | class server | |
108 | { | |
109 | public: | |
b32b8144 | 110 | server(boost::asio::io_context& io_context, |
7c673cae | 111 | unsigned short port, const std::string& filename) |
b32b8144 | 112 | : acceptor_(io_context, tcp::endpoint(tcp::v4(), port)), |
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113 | filename_(filename) |
114 | { | |
115 | start_accept(); | |
116 | } | |
117 | ||
118 | private: | |
119 | void start_accept() | |
120 | { | |
121 | connection::pointer new_connection = | |
b32b8144 | 122 | connection::create(acceptor_.get_executor().context(), filename_); |
7c673cae FG |
123 | |
124 | acceptor_.async_accept(new_connection->socket(), | |
125 | boost::bind(&server::handle_accept, this, new_connection, | |
126 | boost::asio::placeholders::error)); | |
127 | } | |
128 | ||
129 | void handle_accept(connection::pointer new_connection, | |
130 | const boost::system::error_code& error) | |
131 | { | |
132 | if (!error) | |
133 | { | |
134 | new_connection->start(); | |
135 | } | |
136 | ||
137 | start_accept(); | |
138 | } | |
139 | ||
140 | tcp::acceptor acceptor_; | |
141 | std::string filename_; | |
142 | }; | |
143 | ||
144 | int main(int argc, char* argv[]) | |
145 | { | |
146 | try | |
147 | { | |
148 | if (argc != 3) | |
149 | { | |
150 | std::cerr << "Usage: transmit_file <port> <filename>\n"; | |
151 | return 1; | |
152 | } | |
153 | ||
b32b8144 | 154 | boost::asio::io_context io_context; |
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155 | |
156 | using namespace std; // For atoi. | |
b32b8144 | 157 | server s(io_context, atoi(argv[1]), argv[2]); |
7c673cae | 158 | |
b32b8144 | 159 | io_context.run(); |
7c673cae FG |
160 | } |
161 | catch (std::exception& e) | |
162 | { | |
163 | std::cerr << e.what() << std::endl; | |
164 | } | |
165 | ||
166 | return 0; | |
167 | } | |
168 | ||
169 | #else // defined(BOOST_ASIO_HAS_WINDOWS_OVERLAPPED_PTR) | |
170 | # error Overlapped I/O not available on this platform | |
171 | #endif // defined(BOOST_ASIO_HAS_WINDOWS_OVERLAPPED_PTR) |