//
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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_UTF8_CHECKER_HPP
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#define BOOST_BEAST_WEBSOCKET_DETAIL_UTF8_CHECKER_HPP
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#include <boost/beast/core/buffers_range.hpp>
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#include <boost/asio/buffer.hpp>
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#include <cstdint>
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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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/** A UTF8 validator.
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This validator can be used to check if a buffer containing UTF8 text is
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valid. The write function may be called incrementally with segmented UTF8
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sequences. The finish function determines if all processed text is valid.
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*/
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class utf8_checker
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{
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std::size_t need_ = 0; // chars we need to finish the code point
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std::uint8_t* p_ = cp_; // current position in temp buffer
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std::uint8_t cp_[4]; // a temp buffer for the code point
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public:
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/** Prepare to process text as valid utf8
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*/
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BOOST_BEAST_DECL
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void
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reset();
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/** Check that all processed text is valid utf8
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*/
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BOOST_BEAST_DECL
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bool
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finish();
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/** Check if text is valid UTF8
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@return `true` if the text is valid utf8 or false otherwise.
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*/
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BOOST_BEAST_DECL
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bool
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write(std::uint8_t const* in, std::size_t size);
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/** Check if text is valid UTF8
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@return `true` if the text is valid utf8 or false otherwise.
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*/
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template<class ConstBufferSequence>
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bool
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write(ConstBufferSequence const& bs);
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};
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template<class ConstBufferSequence>
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bool
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utf8_checker::
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write(ConstBufferSequence const& buffers)
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{
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static_assert(
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net::is_const_buffer_sequence<ConstBufferSequence>::value,
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"ConstBufferSequence type requirements not met");
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for(auto b : beast::buffers_range_ref(buffers))
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if(! write(static_cast<
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std::uint8_t const*>(b.data()),
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b.size()))
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return false;
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return true;
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}
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BOOST_BEAST_DECL
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bool
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check_utf8(char const* p, std::size_t n);
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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/utf8_checker.ipp>
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#endif
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#endif
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