86 lines
1.8 KiB
C++
86 lines
1.8 KiB
C++
//
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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/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/rfc/detail/h16_rule.hpp>
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#include <boost/url/grammar/charset.hpp>
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#include <boost/url/grammar/error.hpp>
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#include <boost/assert.hpp>
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namespace boost {
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namespace urls {
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namespace detail {
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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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result<value_type>
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{
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// VFALCO it might be impossible for
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// this condition to be true (coverage)
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if(it == end)
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{
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// end
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BOOST_URL_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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// expected HEXDIG
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BOOST_URL_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
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