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//
 
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// Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
 
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// Copyright (c) 2024 Alan de Freitas (alandefreitas@gmail.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/url
 
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//
 
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#ifndef BOOST_URL_RFC_DETAIL_IMPL_H16_RULE_HPP
 
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#define BOOST_URL_RFC_DETAIL_IMPL_H16_RULE_HPP
 
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#include <boost/url/detail/config.hpp>
 
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#include <boost/url/grammar/error.hpp>
 
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#include <boost/url/grammar/hexdig_chars.hpp>
 
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namespace boost {
 
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namespace urls {
 
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namespace detail {
 
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inline BOOST_URL_CXX20_CONSTEXPR
 
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auto
 
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h16_rule_t::
 
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parse(
 
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    char const*& it,
 
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    char const* end
 
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        ) const noexcept ->
 
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    system::result<value_type>
 
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{
 
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    if(it == end)
 
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    {
 
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        BOOST_URL_CONSTEXPR_RETURN_EC(
 
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            grammar::error::invalid);
 
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    }
 
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    std::uint16_t v;
 
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    for(;;)
 
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    {
 
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        auto d = grammar::hexdig_value(*it);
 
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        if(d < 0)
 
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        {
 
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            BOOST_URL_CONSTEXPR_RETURN_EC(
 
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                grammar::error::invalid);
 
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        }
 
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        v = d;
 
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        ++it;
 
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        if(it == end)
 
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            break;
 
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        d = grammar::hexdig_value(*it);
 
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        if(d < 0)
 
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            break;
 
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        v = (16 * v) + d;
 
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        ++it;
 
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        if(it == end)
 
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            break;
 
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        d = grammar::hexdig_value(*it);
 
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        if(d < 0)
 
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            break;
 
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        v = (16 * v) + d;
 
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        ++it;
 
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        if(it == end)
 
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            break;
 
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        d = grammar::hexdig_value(*it);
 
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        if(d < 0)
 
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            break;
 
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        v = (16 * v) + d;
 
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        ++it;
 
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        break;
 
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    }
 
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    return value_type{
 
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        static_cast<
 
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            unsigned char>(v / 256),
 
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        static_cast<
 
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            unsigned char>(v % 256)};
 
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}
 
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} // detail
 
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} // urls
 
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} // boost
 
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#endif