Claw  1.7.3
basic_socketbuf.hpp
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00001 /*
00002   CLAW - a C++ Library Absolutely Wonderful
00003 
00004   CLAW is a free library without any particular aim but being useful to 
00005   anyone.
00006 
00007   Copyright (C) 2005-2011 Julien Jorge
00008 
00009   This library is free software; you can redistribute it and/or
00010   modify it under the terms of the GNU Lesser General Public
00011   License as published by the Free Software Foundation; either
00012   version 2.1 of the License, or (at your option) any later version.
00013 
00014   This library is distributed in the hope that it will be useful,
00015   but WITHOUT ANY WARRANTY; without even the implied warranty of
00016   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00017   Lesser General Public License for more details.
00018 
00019   You should have received a copy of the GNU Lesser General Public
00020   License along with this library; if not, write to the Free Software
00021   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
00022 
00023   contact: julien.jorge@gamned.org
00024 */
00031 #ifndef __CLAW_BASIC_SOCKETBUF_HPP__
00032 #define __CLAW_BASIC_SOCKETBUF_HPP__
00033 
00034 #include <streambuf>
00035 #include <string>
00036 #include <claw/basic_socket.hpp>
00037 
00038 namespace claw
00039 {
00040   namespace net
00041   {
00047     template< typename CharT, typename Traits >
00048     class basic_socketbuf : private basic_socket,
00049                             public std::basic_streambuf<CharT, Traits>
00050     {
00051     public:
00053       typedef CharT                          char_type;
00054 
00056       typedef Traits                         traits_type;
00057 
00059       typedef typename traits_type::int_type int_type;
00060 
00062       typedef typename traits_type::pos_type pos_type;
00063 
00065       typedef typename traits_type::off_type off_type;
00066 
00068       typedef basic_socketbuf<char_type, traits_type> self_type;
00069 
00070     public:
00071       basic_socketbuf( int read_limit = -1 );
00072       virtual ~basic_socketbuf();
00073 
00074       self_type* open( const std::string& addr, int port );
00075       self_type* open( socket_traits::descriptor d );
00076       self_type* close();
00077 
00078       bool is_open() const;
00079 
00080       void set_read_time_limit( int read_limit );
00081 
00082     protected:
00083       virtual int sync();
00084       virtual int_type underflow();
00085       virtual int_type overflow( int_type c = traits_type::eof() );
00086 
00087     private:
00088       bool connect( const std::string& addr, int port );
00089 
00090       void create_buffers();
00091       void destroy_buffers();
00092 
00093       bool buffered() const;
00094 
00095     private:
00098       int m_read_limit;
00099 
00101       char_type* m_input_buffer;
00102 
00104       size_t m_input_buffer_size;
00105 
00107       char_type* m_output_buffer;
00108 
00110       size_t m_output_buffer_size;
00111 
00113       static const size_t s_buffer_size;
00114 
00115     }; // class basic_socketbuf
00116   } // namespace net
00117 } // namespace claw
00118 
00119 #include <claw/impl/basic_socketbuf.tpp>
00120 
00121 #endif // __CLAW_BASIC_SOCKETBUF_HPP__