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//
// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
// Official repository: https://github.com/boostorg/beast
//
#ifndef BOOST_BEAST_DETAIL_OSTREAM_HPP
#define BOOST_BEAST_DETAIL_OSTREAM_HPP
#include <boost/beast/core/buffers_prefix.hpp>
#include <boost/beast/core/buffers_range.hpp>
#include <boost/beast/core/detail/type_traits.hpp>
#include <boost/throw_exception.hpp>
#include <boost/asio/buffer.hpp>
#include <memory>
#include <ostream>
#include <streambuf>
#include <type_traits>
#include <utility>
namespace boost {
namespace beast {
namespace detail {
struct basic_streambuf_movable_helper :
std::basic_streambuf<char, std::char_traits<char>>
{
basic_streambuf_movable_helper(
basic_streambuf_movable_helper&&) = default;
};
using basic_streambuf_movable =
std::is_move_constructible<basic_streambuf_movable_helper>;
template<class DynamicBuffer,
class CharT, class Traits, bool isMovable>
class ostream_buffer;
//------------------------------------------------------------------------------
template<class DynamicBuffer, class CharT, class Traits>
class ostream_buffer
<DynamicBuffer, CharT, Traits, true>
: public std::basic_streambuf<CharT, Traits>
{
using int_type = typename
std::basic_streambuf<CharT, Traits>::int_type;
using traits_type = typename
std::basic_streambuf<CharT, Traits>::traits_type;
DynamicBuffer& b_;
public:
ostream_buffer(ostream_buffer&&) = default;
ostream_buffer(ostream_buffer const&) = delete;
~ostream_buffer() noexcept
{
sync();
}
explicit
ostream_buffer(DynamicBuffer& b)
: b_(b)
{
}
int_type
overflow(int_type ch) override
{
BOOST_ASSERT(! Traits::eq_int_type(
ch, Traits::eof()));
sync();
static std::size_t constexpr max_size = 65536;
auto const max_prepare = std::min<std::size_t>(
std::max<std::size_t>(
512, b_.capacity() - b_.size()),
std::min<std::size_t>(
max_size, b_.max_size() - b_.size()));
if(max_prepare == 0)
return Traits::eof();
auto const bs = b_.prepare(max_prepare);
auto const b = buffers_front(bs);
auto const p = static_cast<CharT*>(b.data());
this->setp(p, p + b.size() / sizeof(CharT));
BOOST_ASSERT(b_.capacity() > b_.size());
return this->sputc(
Traits::to_char_type(ch));
}
int
sync() override
{
b_.commit(
(this->pptr() - this->pbase()) *
sizeof(CharT));
return 0;
}
};
//------------------------------------------------------------------------------
// This nonsense is all to work around a glitch in libstdc++
// where std::basic_streambuf copy constructor is private:
// https://github.com/gcc-mirror/gcc/blob/gcc-4_8-branch/libstdc%2B%2B-v3/include/std/streambuf#L799
template<class DynamicBuffer, class CharT, class Traits>
class ostream_buffer
<DynamicBuffer, CharT, Traits, false>
: public std::basic_streambuf<CharT, Traits>
{
using int_type = typename
std::basic_streambuf<CharT, Traits>::int_type;
using traits_type = typename
std::basic_streambuf<CharT, Traits>::traits_type;
DynamicBuffer& b_;
public:
ostream_buffer(ostream_buffer&&) = delete;
ostream_buffer(ostream_buffer const&) = delete;
~ostream_buffer() noexcept
{
sync();
}
explicit
ostream_buffer(DynamicBuffer& b)
: b_(b)
{
}
int_type
overflow(int_type ch) override
{
BOOST_ASSERT(! Traits::eq_int_type(
ch, Traits::eof()));
sync();
static std::size_t constexpr max_size = 65536;
auto const max_prepare = std::min<std::size_t>(
std::max<std::size_t>(
512, b_.capacity() - b_.size()),
std::min<std::size_t>(
max_size, b_.max_size() - b_.size()));
if(max_prepare == 0)
return Traits::eof();
auto const bs = b_.prepare(max_prepare);
auto const b = buffers_front(bs);
auto const p = static_cast<CharT*>(b.data());
this->setp(p, p + b.size() / sizeof(CharT));
BOOST_ASSERT(b_.capacity() > b_.size());
return this->sputc(
Traits::to_char_type(ch));
}
int
sync() override
{
b_.commit(
(this->pptr() - this->pbase()) *
sizeof(CharT));
return 0;
}
};
//------------------------------------------------------------------------------
template<class DynamicBuffer,
class CharT, class Traits, bool isMovable>
class ostream_helper;
template<class DynamicBuffer, class CharT, class Traits>
class ostream_helper<
DynamicBuffer, CharT, Traits, true>
: public std::basic_ostream<CharT, Traits>
{
ostream_buffer<
DynamicBuffer, CharT, Traits, true> osb_;
public:
explicit
ostream_helper(DynamicBuffer& b);
ostream_helper(ostream_helper&& other);
};
template<class DynamicBuffer, class CharT, class Traits>
ostream_helper<DynamicBuffer, CharT, Traits, true>::
ostream_helper(DynamicBuffer& b)
: std::basic_ostream<CharT, Traits>(&this->osb_)
, osb_(b)
{
}
template<class DynamicBuffer, class CharT, class Traits>
ostream_helper<DynamicBuffer, CharT, Traits, true>::
ostream_helper(ostream_helper&& other)
: std::basic_ostream<CharT, Traits>(&osb_)
, osb_(std::move(other.osb_))
{
}
// This work-around is for libstdc++ versions that
// don't have a movable std::basic_streambuf
template<class T>
class ostream_helper_base
{
protected:
std::unique_ptr<T> member;
ostream_helper_base(
ostream_helper_base&&) = default;
explicit
ostream_helper_base(T* t)
: member(t)
{
}
};
template<class DynamicBuffer, class CharT, class Traits>
class ostream_helper<
DynamicBuffer, CharT, Traits, false>
: private ostream_helper_base<ostream_buffer<
DynamicBuffer, CharT, Traits, false>>
, public std::basic_ostream<CharT, Traits>
{
public:
explicit
ostream_helper(DynamicBuffer& b)
: ostream_helper_base<ostream_buffer<
DynamicBuffer, CharT, Traits, false>>(
new ostream_buffer<DynamicBuffer,
CharT, Traits, false>(b))
, std::basic_ostream<CharT, Traits>(
this->member.get())
{
}
ostream_helper(ostream_helper&& other)
: ostream_helper_base<ostream_buffer<
DynamicBuffer, CharT, Traits, false>>(
std::move(other))
, std::basic_ostream<CharT, Traits>(
this->member.get())
{
}
};
} // detail
} // beast
} // boost
#endif
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