compound.hpp

См. документацию.

/*

Copyright (c) 2002-2005, Yauheni Akhotnikau
All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

- Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.

- Redistributions in binary form must reproduce the above copyright notice, this
list of conditions and the following disclaimer in the documentation and/or
other materials provided with the distribution.

- The name of the author may not be used to endorse or promote products derived
from this software without specific prior written permission.

THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT
OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
OF SUCH DAMAGE.

*/

#if !defined( _OESS_1__TLV__COMPOUND_HPP_ )
#define _OESS_1__TLV__COMPOUND_HPP_

#include <oess_1/tlv/h/declspec.hpp>

#include <map>
#include <string>
#include <functional>
#include <algorithm>

#include <cpp_util_2/h/nocopy.hpp>

#include <oess_1/defs/h/ex.hpp>

#include <oess_1/io/h/subbinstream.hpp>

#include <oess_1/tlv/h/errno.hpp>
#include <oess_1/tlv/h/base.hpp>
#include <oess_1/tlv/h/default_processors.hpp>

namespace oess_1
{

namespace tlv
{

//
// tlv_add_caller_t
//


template< class Compound >
class tlv_add_caller_t
{
  public :
    tlv_add_caller_t(
      Compound & owner,
      tlv_base_t & nested )
    {
      owner.tlv_add( nested );
    }
};

//
// compound_tlv_t
//


template<
  class Tag_type,
  class Tag_processor = default_tag_processor_t< Tag_type >,
  class Length_processor = default_length_processor_t< Tag_type > >
class compound_tlv_t :
  public tlv_base_t,
  private cpp_util_2::nocopy_t
{
  public :
    typedef compound_tlv_t< Tag_type,
        Tag_processor, Length_processor >
      self_t;


    typedef tlv_add_caller_t< self_t >  tlv_add_t;

  private :
    typedef std::map< default_tag_type_t, tlv_base_t * >
      tlv_map_t;


    class length_calc_t :
      public std::unary_function<
        const typename tlv_map_t::value_type &, void >
    {
      private :
        size_t &  m_length;
      public :
        length_calc_t( size_t & length )
          :
            m_length( length )
        {
        }

        result_type
        operator()( argument_type a )
        {
          m_length += a.second->tlv_size();
        }
    };


    class packer_t :
      public std::unary_function<
        const typename tlv_map_t::value_type &, void >
    {
      private :
        oess_1::io::obinstream_t &  m_stream;
      public :
        packer_t( oess_1::io::obinstream_t & stream )
          :
            m_stream( stream )
        {
        }

        result_type
        operator()( argument_type a )
        {
          a.second->tlv_pack( m_stream );
        }
    };

    Tag_processor m_tag;

    Length_processor  m_length;

    tlv_map_t m_tlvs;


    void
    try_unpack_tlv(
      default_tag_type_t tag,
      oess_1::io::ibinstream_t & s )
    {
      typename tlv_map_t::iterator it = m_tlvs.find( tag );
      if( it != m_tlvs.end() )
        // Тег известен.
        it->second->tlv_unpack( s, tag );
      else
        // Тег не известен.
        tlv_on_unexpected_tag( tag, s );
    }


  protected :

    virtual void
    tlv_on_unexpected_tag(
      default_tag_type_t tag,

      oess_1::io::ibinstream_t & s )
    {
      OESS_THROW_PHYSIC( oess_1::tlv::err::c_unexpected_tag,
        "compound tag: " << m_tag.query_tag()
        << ", child tag found: " << tag )
    }

  public :
    compound_tlv_t( Tag_type id )
      :
        m_tag( id )
    {
    }

    virtual ~compound_tlv_t()
    {
    }

    virtual default_tag_type_t
    tlv_tag() const
    {
      return m_tag.query_tag();
    }


    void
    tlv_add(

      tlv_base_t & tlv )
    {
      m_tlvs[ tlv.tlv_tag() ] = &tlv;
    }


    void
    tlv_add(
      default_tag_type_t tag,

      tlv_base_t & tlv )
    {
      m_tlvs[ tag ] = &tlv;
    }


    void
    tlv_remove(
      default_tag_type_t tag )
    {
      m_tlvs.erase( tag );
    }

    virtual size_t
    tlv_size() const
    {
      size_t length = 0;
      std::for_each( m_tlvs.begin(), m_tlvs.end(),
        length_calc_t( length ) );

      length += m_length.tlv_length_size( length );
      length += m_tag.tlv_tag_size();

      return length;
    }

    virtual void
    tlv_unpack(
      oess_1::io::ibinstream_t & s,
      default_tag_type_t )
    {
      size_t length;
      m_length.tlv_unpack_length( s, length );

      // Последовательно считываем дочерние TLV.
      oess_1::io::isubbinstream_t tmp_istream( s, length );
      while( !tmp_istream.eof() )
      {
        Tag_processor tag;
        tag.tlv_unpack_tag( tmp_istream );

        try_unpack_tlv( tag.query_tag(), tmp_istream );
      }
    }

    virtual void
    tlv_pack(
      oess_1::io::obinstream_t & s ) const
    {
      // Длина всех дочерних тегов.
      size_t length = 0;
      std::for_each( m_tlvs.begin(), m_tlvs.end(),
        length_calc_t( length ) );

      m_tag.tlv_pack_tag( s );
      m_length.tlv_pack_length( s, length );
      if( length )
      {
        packer_t packer( s );
        std::for_each( m_tlvs.begin(), m_tlvs.end(), packer );
      }
    }


    self_t &
    tlv_self()
    {
      return *this;
    }
};

} /* namespace tlv */

} /* namespace oess_1 */

#endif

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