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File: h16_rule.ipp
// // Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com) // // Distributed under the Boost Software License, Version 1.0. (See accompanying // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) // // Official repository: https://github.com/boostorg/url // #ifndef BOOST_URL_RFC_DETAIL_IMPL_H16_RULE_HPP #define BOOST_URL_RFC_DETAIL_IMPL_H16_RULE_HPP #include <boost/url/rfc/detail/h16_rule.hpp> #include <boost/url/grammar/charset.hpp> #include <boost/url/grammar/error.hpp> #include <boost/assert.hpp> namespace boost { namespace urls { namespace detail { auto h16_rule_t:: parse( char const*& it, char const* end ) const noexcept -> result<value_type> { // VFALCO it might be impossible for // this condition to be true (coverage) if(it == end) { // end BOOST_URL_RETURN_EC( grammar::error::invalid); } std::uint16_t v; for(;;) { auto d = grammar::hexdig_value(*it); if(d < 0) { // expected HEXDIG BOOST_URL_RETURN_EC( grammar::error::invalid); } v = d; ++it; if(it == end) break; d = grammar::hexdig_value(*it); if(d < 0) break; v = (16 * v) + d; ++it; if(it == end) break; d = grammar::hexdig_value(*it); if(d < 0) break; v = (16 * v) + d; ++it; if(it == end) break; d = grammar::hexdig_value(*it); if(d < 0) break; v = (16 * v) + d; ++it; break; } return value_type{ static_cast< unsigned char>(v / 256), static_cast< unsigned char>(v % 256)}; } } // detail } // urls } // boost #endif