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116 lines
4.7 KiB
116 lines
4.7 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) && (_MSC_VER >= 1020) |
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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 paramters: |
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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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//#if !BOOST_WORKAROUND(__GNUC__, == 2) |
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// BOOST_IOSTREAMS_USING_PROTECTED_STREAMBUF_MEMBERS(base_type) |
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//#endif |
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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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