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114 lines
4.6 KiB
114 lines
4.6 KiB
// (C) Copyright 2008 CodeRage, LLC (turkanis at coderage dot com)
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// (C) Copyright 2003-2007 Jonathan Turkanis
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// Distributed under the Boost Software License, Version 1.0. (See accompanying
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// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt.)
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// See http://www.boost.org/libs/iostreams for documentation.
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#ifndef BOOST_IOSTREAMS_DETAIL_CHAINBUF_HPP_INCLUDED
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#define BOOST_IOSTREAMS_DETAIL_CHAINBUF_HPP_INCLUDED
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#if defined(_MSC_VER)
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# pragma once
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#endif
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#include <boost/config.hpp> // BOOST_MSVC, template friends.
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#include <boost/detail/workaround.hpp>
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#include <boost/iostreams/chain.hpp>
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#include <boost/iostreams/detail/access_control.hpp>
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#include <boost/iostreams/detail/config/wide_streams.hpp>
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#include <boost/iostreams/detail/streambuf.hpp>
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#include <boost/iostreams/detail/streambuf/linked_streambuf.hpp>
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#include <boost/iostreams/detail/translate_int_type.hpp>
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#include <boost/iostreams/traits.hpp>
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#include <boost/noncopyable.hpp>
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namespace boost { namespace iostreams { namespace detail {
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//--------------Definition of chainbuf----------------------------------------//
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//
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// Template name: chainbuf.
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// Description: Stream buffer which operates by delegating to the first
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// linked_streambuf in a chain.
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// Template parameters:
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// Chain - The chain type.
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//
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template<typename Chain, typename Mode, typename Access>
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class chainbuf
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: public BOOST_IOSTREAMS_BASIC_STREAMBUF(
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typename Chain::char_type,
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typename Chain::traits_type
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),
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public access_control<typename Chain::client_type, Access>,
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private noncopyable
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{
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private:
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typedef access_control<chain_client<Chain>, Access> client_type;
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public:
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typedef typename Chain::char_type char_type;
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BOOST_IOSTREAMS_STREAMBUF_TYPEDEFS(typename Chain::traits_type)
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protected:
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typedef linked_streambuf<char_type, traits_type> delegate_type;
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chainbuf() { client_type::set_chain(&chain_); }
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int_type underflow()
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{ sentry t(this); return translate(delegate().underflow()); }
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int_type pbackfail(int_type c)
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{ sentry t(this); return translate(delegate().pbackfail(c)); }
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std::streamsize xsgetn(char_type* s, std::streamsize n)
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{ sentry t(this); return delegate().xsgetn(s, n); }
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int_type overflow(int_type c)
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{ sentry t(this); return translate(delegate().overflow(c)); }
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std::streamsize xsputn(const char_type* s, std::streamsize n)
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{ sentry t(this); return delegate().xsputn(s, n); }
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int sync() { sentry t(this); return delegate().sync(); }
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pos_type seekoff( off_type off, BOOST_IOS::seekdir way,
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BOOST_IOS::openmode which =
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BOOST_IOS::in | BOOST_IOS::out )
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{ sentry t(this); return delegate().seekoff(off, way, which); }
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pos_type seekpos( pos_type sp,
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BOOST_IOS::openmode which =
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BOOST_IOS::in | BOOST_IOS::out )
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{ sentry t(this); return delegate().seekpos(sp, which); }
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protected:
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typedef BOOST_IOSTREAMS_BASIC_STREAMBUF(
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typename Chain::char_type,
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typename Chain::traits_type
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) base_type;
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private:
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// Translate from std int_type to chain's int_type.
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typedef BOOST_IOSTREAMS_CHAR_TRAITS(char_type) std_traits;
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typedef typename Chain::traits_type chain_traits;
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static typename chain_traits::int_type
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translate(typename std_traits::int_type c)
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{ return translate_int_type<std_traits, chain_traits>(c); }
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delegate_type& delegate()
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{ return static_cast<delegate_type&>(chain_.front()); }
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void get_pointers()
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{
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this->setg(delegate().eback(), delegate().gptr(), delegate().egptr());
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this->setp(delegate().pbase(), delegate().epptr());
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this->pbump((int) (delegate().pptr() - delegate().pbase()));
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}
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void set_pointers()
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{
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delegate().setg(this->eback(), this->gptr(), this->egptr());
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delegate().setp(this->pbase(), this->epptr());
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delegate().pbump((int) (this->pptr() - this->pbase()));
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}
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struct sentry {
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sentry(chainbuf<Chain, Mode, Access>* buf) : buf_(buf)
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{ buf_->set_pointers(); }
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~sentry() { buf_->get_pointers(); }
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chainbuf<Chain, Mode, Access>* buf_;
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};
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friend struct sentry;
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Chain chain_;
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};
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} } } // End namespaces detail, iostreams, boost.
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#endif // #ifndef BOOST_IOSTREAMS_DETAIL_CHAINBUF_HPP_INCLUDED
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