492 lines
19 KiB
C++
492 lines
19 KiB
C++
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//////////////////////////////////////////////////////////////////////////////
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//
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// (C) Copyright Ion Gaztanaga 2005-2012. Distributed under the Boost
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// Software License, Version 1.0. (See accompanying file
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// LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
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//
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// See http://www.boost.org/libs/interprocess for documentation.
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//
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//////////////////////////////////////////////////////////////////////////////
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//
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// This file comes from SGI's sstream file. Modified by Ion Gaztanaga 2005-2012.
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// Changed internal SGI string to a buffer. Added efficient
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// internal buffer get/set/swap functions, so that we can obtain/establish the
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// internal buffer without any reallocation or copy. Kill those temporaries!
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///////////////////////////////////////////////////////////////////////////////
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/*
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* Copyright (c) 1998
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* Silicon Graphics Computer Systems, Inc.
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*
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* Permission to use, copy, modify, distribute and sell this software
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* and its documentation for any purpose is hereby granted without fee,
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* provided that the above copyright notice appear in all copies and
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* that both that copyright notice and this permission notice appear
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* in supporting documentation. Silicon Graphics makes no
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* representations about the suitability of this software for any
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* purpose. It is provided "as is" without express or implied warranty.
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*/
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//!\file
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//!This file defines basic_bufferbuf, basic_ibufferstream,
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//!basic_obufferstream, and basic_bufferstream classes. These classes
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//!represent streamsbufs and streams whose sources or destinations
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//!are fixed size character buffers.
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#ifndef BOOST_INTERPROCESS_BUFFERSTREAM_HPP
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#define BOOST_INTERPROCESS_BUFFERSTREAM_HPP
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#ifndef BOOST_CONFIG_HPP
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# include <boost/config.hpp>
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#endif
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#
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#if defined(BOOST_HAS_PRAGMA_ONCE)
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# pragma once
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#endif
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#include <boost/interprocess/detail/config_begin.hpp>
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#include <boost/interprocess/detail/workaround.hpp>
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#include <iosfwd>
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#include <ios>
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#include <istream>
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#include <ostream>
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#include <string> // char traits
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#include <cstddef> // ptrdiff_t
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#include <boost/assert.hpp>
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#include <boost/interprocess/interprocess_fwd.hpp>
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namespace boost { namespace interprocess {
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//!A streambuf class that controls the transmission of elements to and from
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//!a basic_xbufferstream. The elements are transmitted from a to a fixed
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//!size buffer
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template <class CharT, class CharTraits>
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class basic_bufferbuf
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: public std::basic_streambuf<CharT, CharTraits>
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{
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public:
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typedef CharT char_type;
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typedef typename CharTraits::int_type int_type;
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typedef typename CharTraits::pos_type pos_type;
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typedef typename CharTraits::off_type off_type;
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typedef CharTraits traits_type;
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typedef std::basic_streambuf<char_type, traits_type> basic_streambuf_t;
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public:
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//!Constructor.
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//!Does not throw.
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explicit basic_bufferbuf(std::ios_base::openmode mode
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= std::ios_base::in | std::ios_base::out)
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: basic_streambuf_t(), m_mode(mode), m_buffer(0), m_length(0)
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{}
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//!Constructor. Assigns formatting buffer.
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//!Does not throw.
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explicit basic_bufferbuf(CharT *buf, std::size_t length,
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std::ios_base::openmode mode
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= std::ios_base::in | std::ios_base::out)
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: basic_streambuf_t(), m_mode(mode), m_buffer(buf), m_length(length)
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{ this->set_pointers(); }
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virtual ~basic_bufferbuf(){}
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public:
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//!Returns the pointer and size of the internal buffer.
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//!Does not throw.
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std::pair<CharT *, std::size_t> buffer() const
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{ return std::pair<CharT *, std::size_t>(m_buffer, m_length); }
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//!Sets the underlying buffer to a new value
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//!Does not throw.
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void buffer(CharT *buf, std::size_t length)
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{ m_buffer = buf; m_length = length; this->set_pointers(); }
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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private:
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void set_pointers()
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{
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// The initial read position is the beginning of the buffer.
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if(m_mode & std::ios_base::in)
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this->setg(m_buffer, m_buffer, m_buffer + m_length);
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// The initial write position is the beginning of the buffer.
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if(m_mode & std::ios_base::out)
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this->setp(m_buffer, m_buffer + m_length);
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}
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protected:
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virtual int_type underflow()
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{
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// Precondition: gptr() >= egptr(). Returns a character, if available.
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return this->gptr() != this->egptr() ?
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CharTraits::to_int_type(*this->gptr()) : CharTraits::eof();
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}
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virtual int_type pbackfail(int_type c = CharTraits::eof())
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{
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if(this->gptr() != this->eback()) {
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if(!CharTraits::eq_int_type(c, CharTraits::eof())) {
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if(CharTraits::eq(CharTraits::to_char_type(c), this->gptr()[-1])) {
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this->gbump(-1);
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return c;
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}
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else if(m_mode & std::ios_base::out) {
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this->gbump(-1);
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*this->gptr() = c;
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return c;
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}
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else
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return CharTraits::eof();
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}
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else {
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this->gbump(-1);
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return CharTraits::not_eof(c);
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}
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}
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else
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return CharTraits::eof();
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}
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virtual int_type overflow(int_type c = CharTraits::eof())
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{
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if(m_mode & std::ios_base::out) {
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if(!CharTraits::eq_int_type(c, CharTraits::eof())) {
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// if(!(m_mode & std::ios_base::in)) {
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// if(this->pptr() != this->epptr()) {
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// *this->pptr() = CharTraits::to_char_type(c);
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// this->pbump(1);
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// return c;
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// }
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// else
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// return CharTraits::eof();
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// }
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// else {
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if(this->pptr() == this->epptr()) {
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//We can't append to a static buffer
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return CharTraits::eof();
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}
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else {
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*this->pptr() = CharTraits::to_char_type(c);
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this->pbump(1);
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return c;
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}
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// }
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}
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else // c is EOF, so we don't have to do anything
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return CharTraits::not_eof(c);
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}
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else // Overflow always fails if it's read-only.
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return CharTraits::eof();
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}
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virtual pos_type seekoff(off_type off, std::ios_base::seekdir dir,
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std::ios_base::openmode mode
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= std::ios_base::in | std::ios_base::out)
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{
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bool in = false;
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bool out = false;
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const std::ios_base::openmode inout =
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std::ios_base::in | std::ios_base::out;
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if((mode & inout) == inout) {
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if(dir == std::ios_base::beg || dir == std::ios_base::end)
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in = out = true;
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}
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else if(mode & std::ios_base::in)
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in = true;
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else if(mode & std::ios_base::out)
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out = true;
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if(!in && !out)
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return pos_type(off_type(-1));
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else if((in && (!(m_mode & std::ios_base::in) || (off != 0 && this->gptr() == 0) )) ||
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(out && (!(m_mode & std::ios_base::out) || (off != 0 && this->pptr() == 0))))
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return pos_type(off_type(-1));
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std::streamoff newoff;
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switch(dir) {
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case std::ios_base::beg:
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newoff = 0;
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break;
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case std::ios_base::end:
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newoff = static_cast<std::streamoff>(m_length);
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break;
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case std::ios_base::cur:
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newoff = in ? static_cast<std::streamoff>(this->gptr() - this->eback())
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: static_cast<std::streamoff>(this->pptr() - this->pbase());
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break;
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default:
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return pos_type(off_type(-1));
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}
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off += newoff;
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if(in) {
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std::ptrdiff_t n = this->egptr() - this->eback();
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if(off < 0 || off > n)
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return pos_type(off_type(-1));
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else
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this->setg(this->eback(), this->eback() + off, this->eback() + n);
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}
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if(out) {
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std::ptrdiff_t n = this->epptr() - this->pbase();
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if(off < 0 || off > n)
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return pos_type(off_type(-1));
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else {
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this->setp(this->pbase(), this->pbase() + n);
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this->pbump(off);
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}
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}
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return pos_type(off);
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}
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virtual pos_type seekpos(pos_type pos, std::ios_base::openmode mode
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= std::ios_base::in | std::ios_base::out)
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{ return seekoff(pos - pos_type(off_type(0)), std::ios_base::beg, mode); }
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private:
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std::ios_base::openmode m_mode;
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CharT * m_buffer;
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std::size_t m_length;
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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};
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//!A basic_istream class that uses a fixed size character buffer
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//!as its formatting buffer.
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template <class CharT, class CharTraits>
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class basic_ibufferstream :
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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private basic_bufferbuf<CharT, CharTraits>,
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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public std::basic_istream<CharT, CharTraits>
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{
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public: // Typedefs
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typedef typename std::basic_ios
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<CharT, CharTraits>::char_type char_type;
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typedef typename std::basic_ios<char_type, CharTraits>::int_type int_type;
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typedef typename std::basic_ios<char_type, CharTraits>::pos_type pos_type;
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typedef typename std::basic_ios<char_type, CharTraits>::off_type off_type;
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typedef typename std::basic_ios<char_type, CharTraits>::traits_type traits_type;
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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private:
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typedef basic_bufferbuf<CharT, CharTraits> bufferbuf_t;
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typedef std::basic_ios<char_type, CharTraits> basic_ios_t;
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typedef std::basic_istream<char_type, CharTraits> basic_streambuf_t;
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bufferbuf_t & get_buf() { return *this; }
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const bufferbuf_t & get_buf() const{ return *this; }
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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public:
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//!Constructor.
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//!Does not throw.
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basic_ibufferstream(std::ios_base::openmode mode = std::ios_base::in)
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: //basic_ios_t() is called first (lefting it uninitialized) as it's a
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//virtual base of basic_istream. The class will be initialized when
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//basic_istream is constructed calling basic_ios_t::init().
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//As bufferbuf_t's constructor does not throw there is no risk of
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//calling the basic_ios_t's destructor without calling basic_ios_t::init()
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bufferbuf_t(mode | std::ios_base::in)
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, basic_streambuf_t(this)
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{}
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//!Constructor. Assigns formatting buffer.
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//!Does not throw.
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basic_ibufferstream(const CharT *buf, std::size_t length,
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std::ios_base::openmode mode = std::ios_base::in)
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: //basic_ios_t() is called first (lefting it uninitialized) as it's a
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//virtual base of basic_istream. The class will be initialized when
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//basic_istream is constructed calling basic_ios_t::init().
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//As bufferbuf_t's constructor does not throw there is no risk of
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//calling the basic_ios_t's destructor without calling basic_ios_t::init()
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bufferbuf_t(const_cast<CharT*>(buf), length, mode | std::ios_base::in)
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, basic_streambuf_t(this)
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{}
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~basic_ibufferstream(){};
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public:
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//!Returns the address of the stored
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//!stream buffer.
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basic_bufferbuf<CharT, CharTraits>* rdbuf() const
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{ return const_cast<basic_bufferbuf<CharT, CharTraits>*>(&get_buf()); }
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//!Returns the pointer and size of the internal buffer.
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//!Does not throw.
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std::pair<const CharT *, std::size_t> buffer() const
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{ return get_buf().buffer(); }
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//!Sets the underlying buffer to a new value. Resets
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//!stream position. Does not throw.
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void buffer(const CharT *buf, std::size_t length)
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{ get_buf().buffer(const_cast<CharT*>(buf), length); }
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};
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//!A basic_ostream class that uses a fixed size character buffer
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//!as its formatting buffer.
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template <class CharT, class CharTraits>
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class basic_obufferstream :
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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private basic_bufferbuf<CharT, CharTraits>,
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#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
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public std::basic_ostream<CharT, CharTraits>
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{
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public:
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typedef typename std::basic_ios
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<CharT, CharTraits>::char_type char_type;
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typedef typename std::basic_ios<char_type, CharTraits>::int_type int_type;
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typedef typename std::basic_ios<char_type, CharTraits>::pos_type pos_type;
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typedef typename std::basic_ios<char_type, CharTraits>::off_type off_type;
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typedef typename std::basic_ios<char_type, CharTraits>::traits_type traits_type;
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#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
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private:
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typedef basic_bufferbuf<CharT, CharTraits> bufferbuf_t;
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typedef std::basic_ios<char_type, CharTraits> basic_ios_t;
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typedef std::basic_ostream<char_type, CharTraits> basic_ostream_t;
|
||
|
|
bufferbuf_t & get_buf() { return *this; }
|
||
|
|
const bufferbuf_t & get_buf() const{ return *this; }
|
||
|
|
#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
|
||
|
|
|
||
|
|
public:
|
||
|
|
//!Constructor.
|
||
|
|
//!Does not throw.
|
||
|
|
basic_obufferstream(std::ios_base::openmode mode = std::ios_base::out)
|
||
|
|
: //basic_ios_t() is called first (lefting it uninitialized) as it's a
|
||
|
|
//virtual base of basic_istream. The class will be initialized when
|
||
|
|
//basic_istream is constructed calling basic_ios_t::init().
|
||
|
|
//As bufferbuf_t's constructor does not throw there is no risk of
|
||
|
|
//calling the basic_ios_t's destructor without calling basic_ios_t::init()
|
||
|
|
bufferbuf_t(mode | std::ios_base::out)
|
||
|
|
, basic_ostream_t(this)
|
||
|
|
{}
|
||
|
|
|
||
|
|
//!Constructor. Assigns formatting buffer.
|
||
|
|
//!Does not throw.
|
||
|
|
basic_obufferstream(CharT *buf, std::size_t length,
|
||
|
|
std::ios_base::openmode mode = std::ios_base::out)
|
||
|
|
: //basic_ios_t() is called first (lefting it uninitialized) as it's a
|
||
|
|
//virtual base of basic_istream. The class will be initialized when
|
||
|
|
//basic_istream is constructed calling basic_ios_t::init().
|
||
|
|
//As bufferbuf_t's constructor does not throw there is no risk of
|
||
|
|
//calling the basic_ios_t's destructor without calling basic_ios_t::init()
|
||
|
|
bufferbuf_t(buf, length, mode | std::ios_base::out)
|
||
|
|
, basic_ostream_t(this)
|
||
|
|
{}
|
||
|
|
|
||
|
|
~basic_obufferstream(){}
|
||
|
|
|
||
|
|
public:
|
||
|
|
//!Returns the address of the stored
|
||
|
|
//!stream buffer.
|
||
|
|
basic_bufferbuf<CharT, CharTraits>* rdbuf() const
|
||
|
|
{ return const_cast<basic_bufferbuf<CharT, CharTraits>*>(&get_buf()); }
|
||
|
|
|
||
|
|
//!Returns the pointer and size of the internal buffer.
|
||
|
|
//!Does not throw.
|
||
|
|
std::pair<CharT *, std::size_t> buffer() const
|
||
|
|
{ return get_buf().buffer(); }
|
||
|
|
|
||
|
|
//!Sets the underlying buffer to a new value. Resets
|
||
|
|
//!stream position. Does not throw.
|
||
|
|
void buffer(CharT *buf, std::size_t length)
|
||
|
|
{ get_buf().buffer(buf, length); }
|
||
|
|
};
|
||
|
|
|
||
|
|
|
||
|
|
//!A basic_iostream class that uses a fixed size character buffer
|
||
|
|
//!as its formatting buffer.
|
||
|
|
template <class CharT, class CharTraits>
|
||
|
|
class basic_bufferstream :
|
||
|
|
#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
|
||
|
|
private basic_bufferbuf<CharT, CharTraits>,
|
||
|
|
#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
|
||
|
|
public std::basic_iostream<CharT, CharTraits>
|
||
|
|
{
|
||
|
|
public: // Typedefs
|
||
|
|
typedef typename std::basic_ios
|
||
|
|
<CharT, CharTraits>::char_type char_type;
|
||
|
|
typedef typename std::basic_ios<char_type, CharTraits>::int_type int_type;
|
||
|
|
typedef typename std::basic_ios<char_type, CharTraits>::pos_type pos_type;
|
||
|
|
typedef typename std::basic_ios<char_type, CharTraits>::off_type off_type;
|
||
|
|
typedef typename std::basic_ios<char_type, CharTraits>::traits_type traits_type;
|
||
|
|
|
||
|
|
#if !defined(BOOST_INTERPROCESS_DOXYGEN_INVOKED)
|
||
|
|
private:
|
||
|
|
typedef basic_bufferbuf<CharT, CharTraits> bufferbuf_t;
|
||
|
|
typedef std::basic_ios<char_type, CharTraits> basic_ios_t;
|
||
|
|
typedef std::basic_iostream<char_type, CharTraits> basic_iostream_t;
|
||
|
|
bufferbuf_t & get_buf() { return *this; }
|
||
|
|
const bufferbuf_t & get_buf() const{ return *this; }
|
||
|
|
#endif //#ifndef BOOST_INTERPROCESS_DOXYGEN_INVOKED
|
||
|
|
|
||
|
|
public:
|
||
|
|
//!Constructor.
|
||
|
|
//!Does not throw.
|
||
|
|
basic_bufferstream(std::ios_base::openmode mode
|
||
|
|
= std::ios_base::in | std::ios_base::out)
|
||
|
|
: //basic_ios_t() is called first (lefting it uninitialized) as it's a
|
||
|
|
//virtual base of basic_istream. The class will be initialized when
|
||
|
|
//basic_istream is constructed calling basic_ios_t::init().
|
||
|
|
//As bufferbuf_t's constructor does not throw there is no risk of
|
||
|
|
//calling the basic_ios_t's destructor without calling basic_ios_t::init()
|
||
|
|
bufferbuf_t(mode)
|
||
|
|
, basic_iostream_t(this)
|
||
|
|
{}
|
||
|
|
|
||
|
|
//!Constructor. Assigns formatting buffer.
|
||
|
|
//!Does not throw.
|
||
|
|
basic_bufferstream(CharT *buf, std::size_t length,
|
||
|
|
std::ios_base::openmode mode
|
||
|
|
= std::ios_base::in | std::ios_base::out)
|
||
|
|
: //basic_ios_t() is called first (lefting it uninitialized) as it's a
|
||
|
|
//virtual base of basic_istream. The class will be initialized when
|
||
|
|
//basic_istream is constructed calling basic_ios_t::init().
|
||
|
|
//As bufferbuf_t's constructor does not throw there is no risk of
|
||
|
|
//calling the basic_ios_t's destructor without calling basic_ios_t::init()
|
||
|
|
bufferbuf_t(buf, length, mode)
|
||
|
|
, basic_iostream_t(this)
|
||
|
|
{}
|
||
|
|
|
||
|
|
~basic_bufferstream(){}
|
||
|
|
|
||
|
|
public:
|
||
|
|
//!Returns the address of the stored
|
||
|
|
//!stream buffer.
|
||
|
|
basic_bufferbuf<CharT, CharTraits>* rdbuf() const
|
||
|
|
{ return const_cast<basic_bufferbuf<CharT, CharTraits>*>(&get_buf()); }
|
||
|
|
|
||
|
|
//!Returns the pointer and size of the internal buffer.
|
||
|
|
//!Does not throw.
|
||
|
|
std::pair<CharT *, std::size_t> buffer() const
|
||
|
|
{ return get_buf().buffer(); }
|
||
|
|
|
||
|
|
//!Sets the underlying buffer to a new value. Resets
|
||
|
|
//!stream position. Does not throw.
|
||
|
|
void buffer(CharT *buf, std::size_t length)
|
||
|
|
{ get_buf().buffer(buf, length); }
|
||
|
|
};
|
||
|
|
|
||
|
|
//Some typedefs to simplify usage
|
||
|
|
typedef basic_bufferbuf<char> bufferbuf;
|
||
|
|
typedef basic_bufferstream<char> bufferstream;
|
||
|
|
typedef basic_ibufferstream<char> ibufferstream;
|
||
|
|
typedef basic_obufferstream<char> obufferstream;
|
||
|
|
|
||
|
|
typedef basic_bufferbuf<wchar_t> wbufferbuf;
|
||
|
|
typedef basic_bufferstream<wchar_t> wbufferstream;
|
||
|
|
typedef basic_ibufferstream<wchar_t> wibufferstream;
|
||
|
|
typedef basic_obufferstream<wchar_t> wobufferstream;
|
||
|
|
|
||
|
|
|
||
|
|
}} //namespace boost { namespace interprocess {
|
||
|
|
|
||
|
|
#include <boost/interprocess/detail/config_end.hpp>
|
||
|
|
|
||
|
|
#endif /* BOOST_INTERPROCESS_BUFFERSTREAM_HPP */
|