//
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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_HTTP_IMPL_FIELDS_IPP
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#define BOOST_BEAST_HTTP_IMPL_FIELDS_IPP
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#include <boost/beast/http/fields.hpp>
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namespace boost {
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namespace beast {
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namespace http {
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namespace detail {
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// `basic_fields` assumes that `std::size_t` is larger than `uint16_t`, so we
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// verify it explicitly here, so that users that use split compilation don't
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// need to pay the (fairly small) price for this sanity check
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BOOST_STATIC_ASSERT((std::numeric_limits<std::size_t>::max)() >=
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(std::numeric_limits<std::uint32_t>::max)());
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// Filter a token list
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//
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inline
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void
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filter_token_list(
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beast::detail::temporary_buffer& s,
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string_view value,
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iequals_predicate const& pred)
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{
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token_list te{value};
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auto it = te.begin();
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auto last = te.end();
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if(it == last)
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return;
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while(pred(*it))
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if(++it == last)
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return;
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s.append(*it);
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while(++it != last)
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{
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if(! pred(*it))
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{
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s.append(", ", *it);
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}
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}
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}
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void
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filter_token_list_last(
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beast::detail::temporary_buffer& s,
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string_view value,
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iequals_predicate const& pred)
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{
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token_list te{value};
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if(te.begin() != te.end())
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{
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auto it = te.begin();
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auto next = std::next(it);
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if(next == te.end())
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{
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if(! pred(*it))
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s.append(*it);
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return;
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}
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s.append(*it);
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for(;;)
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{
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it = next;
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next = std::next(it);
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if(next == te.end())
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{
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if(! pred(*it))
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{
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s.append(", ", *it);
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}
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return;
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}
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s.append(", ", *it);
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}
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}
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}
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void
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keep_alive_impl(
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beast::detail::temporary_buffer& s, string_view value,
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unsigned version, bool keep_alive)
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{
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if(version < 11)
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{
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if(keep_alive)
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{
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// remove close
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filter_token_list(s, value, iequals_predicate{"close", {}});
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// add keep-alive
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if(s.empty())
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s.append("keep-alive");
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else if(! token_list{value}.exists("keep-alive"))
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s.append(", keep-alive");
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}
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else
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{
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// remove close and keep-alive
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filter_token_list(s, value,
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iequals_predicate{"close", "keep-alive"});
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}
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}
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else
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{
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if(keep_alive)
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{
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// remove close and keep-alive
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filter_token_list(s, value,
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iequals_predicate{"close", "keep-alive"});
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}
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else
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{
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// remove keep-alive
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filter_token_list(s, value, iequals_predicate{"keep-alive", {}});
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// add close
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if(s.empty())
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s.append("close");
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else if(! token_list{value}.exists("close"))
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s.append(", close");
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}
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}
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}
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} // detail
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} // http
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} // beast
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} // boost
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#endif // BOOST_BEAST_HTTP_IMPL_FIELDS_IPP
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