//
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// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
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//
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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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//
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// Official repository: https://github.com/boostorg/beast
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//
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#ifndef BOOST_BEAST_CORE_DETAIL_FLAT_STREAM_HPP
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#define BOOST_BEAST_CORE_DETAIL_FLAT_STREAM_HPP
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#include <boost/beast/core/buffer_traits.hpp>
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#include <boost/asio/buffer.hpp>
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#include <cstdlib>
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namespace boost {
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namespace beast {
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namespace detail {
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class flat_stream_base
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{
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public:
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// Largest buffer size we will flatten.
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// 16KB is the upper limit on reasonably sized HTTP messages.
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static std::size_t constexpr max_size = 16 * 1024;
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// Largest stack we will use to flatten
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static std::size_t constexpr max_stack = 8 * 1024;
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struct flatten_result
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{
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std::size_t size;
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bool flatten;
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};
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// calculates the flatten settings for a buffer sequence
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template<class BufferSequence>
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static
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flatten_result
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flatten(
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BufferSequence const& buffers, std::size_t limit)
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{
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flatten_result result{0, false};
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auto first = net::buffer_sequence_begin(buffers);
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auto last = net::buffer_sequence_end(buffers);
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if(first != last)
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{
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result.size = buffer_bytes(*first);
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if(result.size < limit)
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{
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auto it = first;
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auto prev = first;
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while(++it != last)
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{
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auto const n = buffer_bytes(*it);
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if(result.size + n > limit)
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break;
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result.size += n;
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prev = it;
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}
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result.flatten = prev != first;
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}
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}
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return result;
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}
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};
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} // detail
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} // beast
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} // boost
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#endif
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