//
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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_WEBSOCKET_DETAIL_PMD_EXTENSION_HPP
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#define BOOST_BEAST_WEBSOCKET_DETAIL_PMD_EXTENSION_HPP
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#include <boost/beast/core/error.hpp>
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#include <boost/beast/websocket/option.hpp>
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#include <boost/beast/http/rfc7230.hpp>
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#include <utility>
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#include <type_traits>
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namespace boost {
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namespace beast {
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namespace websocket {
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namespace detail {
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// permessage-deflate offer parameters
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//
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// "context takeover" means:
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// preserve sliding window across messages
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//
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struct pmd_offer
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{
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bool accept;
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// 0 = absent, or 8..15
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int server_max_window_bits;
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// -1 = present, 0 = absent, or 8..15
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int client_max_window_bits;
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// `true` if server_no_context_takeover offered
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bool server_no_context_takeover;
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// `true` if client_no_context_takeover offered
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bool client_no_context_takeover;
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};
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BOOST_BEAST_DECL
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int
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parse_bits(string_view s);
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BOOST_BEAST_DECL
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void
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pmd_read_impl(pmd_offer& offer, http::ext_list const& list);
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BOOST_BEAST_DECL
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static_string<512>
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pmd_write_impl(pmd_offer const& offer);
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BOOST_BEAST_DECL
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static_string<512>
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pmd_negotiate_impl(
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pmd_offer& config,
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pmd_offer const& offer,
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permessage_deflate const& o);
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// Parse permessage-deflate request fields
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//
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template<class Allocator>
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void
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pmd_read(pmd_offer& offer,
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http::basic_fields<Allocator> const& fields)
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{
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http::ext_list list{
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fields["Sec-WebSocket-Extensions"]};
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detail::pmd_read_impl(offer, list);
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}
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// Set permessage-deflate fields for a client offer
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//
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template<class Allocator>
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void
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pmd_write(http::basic_fields<Allocator>& fields,
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pmd_offer const& offer)
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{
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auto s = detail::pmd_write_impl(offer);
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fields.set(http::field::sec_websocket_extensions, s);
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}
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// Negotiate a permessage-deflate client offer
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//
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template<class Allocator>
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void
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pmd_negotiate(
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http::basic_fields<Allocator>& fields,
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pmd_offer& config,
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pmd_offer const& offer,
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permessage_deflate const& o)
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{
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if(! (offer.accept && o.server_enable))
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{
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config.accept = false;
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return;
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}
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config.accept = true;
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auto s = detail::pmd_negotiate_impl(config, offer, o);
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if(config.accept)
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fields.set(http::field::sec_websocket_extensions, s);
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}
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// Normalize the server's response
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//
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BOOST_BEAST_DECL
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void
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pmd_normalize(pmd_offer& offer);
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} // detail
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} // websocket
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} // beast
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} // boost
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#if BOOST_BEAST_HEADER_ONLY
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#include <boost/beast/websocket/detail/pmd_extension.ipp>
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#endif
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#endif
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