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//
// Copyright (c) 2016-2017 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_CORE_DETAIL_FLAT_STREAM_HPP
#define BOOST_BEAST_CORE_DETAIL_FLAT_STREAM_HPP
#include <boost/asio/buffer.hpp>
#include <cstdlib>
#include <iterator>
namespace boost {
namespace beast {
namespace detail {
class flat_stream_base
{
public:
// Largest buffer size we will flatten.
// 16KB is the upper limit on reasonably sized HTTP messages.
static std::size_t constexpr coalesce_limit = 16 * 1024;
// calculates the coalesce settings for a buffer sequence
template<class BufferSequence>
static
std::pair<std::size_t, bool>
coalesce(BufferSequence const& buffers, std::size_t limit)
{
std::pair<std::size_t, bool> result{0, false};
auto first = boost::asio::buffer_sequence_begin(buffers);
auto last = boost::asio::buffer_sequence_end(buffers);
if(first != last)
{
result.first = boost::asio::buffer_size(*first);
if(result.first < limit)
{
auto it = first;
auto prev = first;
while(++it != last)
{
auto const n =
boost::asio::buffer_size(*it);
if(result.first + n > limit)
break;
result.first += n;
prev = it;
}
result.second = prev != first;
}
}
return result;
}
};
} // detail
} // beast
} // boost
#endif
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