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) 2005-2008 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@yahoo.fr
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:
00052       typedef CharT                          char_type;
00053       typedef Traits                         traits_type;
00054       typedef typename traits_type::int_type int_type;
00055       typedef typename traits_type::pos_type pos_type;
00056       typedef typename traits_type::off_type off_type;
00057 
00058       typedef basic_socketbuf<char_type, traits_type> self_type;
00059 
00060     public:
00061       basic_socketbuf();
00062       virtual ~basic_socketbuf();
00063 
00064       self_type* open( const std::string& addr, int port );
00065       self_type* open( socket_traits::descriptor d );
00066       self_type* close();
00067 
00068       bool is_open() const;
00069 
00070     protected:
00071       virtual int sync();
00072       virtual int_type underflow();
00073       virtual int_type overflow( int_type c = traits_type::eof() );
00074 
00075     private:
00076       bool connect( const std::string& addr, int port );
00077 
00078       void create_buffers();
00079       void destroy_buffers();
00080 
00081       bool buffered() const;
00082 
00083     private:
00085       char_type* m_input_buffer;
00086 
00088       size_t m_input_buffer_size;
00089 
00091       char_type* m_output_buffer;
00092 
00094       size_t m_output_buffer_size;
00095 
00097       static const size_t s_buffer_size;
00098 
00099     }; // class basic_socketbuf
00100   } // namespace net
00101 } // namespace claw
00102 
00103 #include <claw/impl/basic_socketbuf.tpp>
00104 
00105 #endif // __CLAW_BASIC_SOCKETBUF_HPP__

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