97 lines
2.4 KiB
C++
97 lines
2.4 KiB
C++
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//
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// request_parser.hpp
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// ~~~~~~~~~~~~~~~~~~
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//
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// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff 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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#ifndef HTTP_REQUEST_PARSER_HPP
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#define HTTP_REQUEST_PARSER_HPP
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#include <tuple>
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namespace http {
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namespace server {
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struct request;
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/// Parser for incoming requests.
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class request_parser
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{
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public:
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/// Construct ready to parse the request method.
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request_parser();
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/// Reset to initial parser state.
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void reset();
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/// Result of parse.
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enum result_type { good, bad, indeterminate };
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/// Parse some data. The enum return value is good when a complete request has
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/// been parsed, bad if the data is invalid, indeterminate when more data is
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/// required. The InputIterator return value indicates how much of the input
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/// has been consumed.
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template <typename InputIterator>
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std::tuple<result_type, InputIterator> parse(request& req,
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InputIterator begin, InputIterator end)
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{
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while (begin != end)
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{
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result_type result = consume(req, *begin++);
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if (result == good || result == bad)
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return std::make_tuple(result, begin);
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}
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return std::make_tuple(indeterminate, begin);
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}
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private:
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/// Handle the next character of input.
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result_type consume(request& req, char input);
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/// Check if a byte is an HTTP character.
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static bool is_char(int c);
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/// Check if a byte is an HTTP control character.
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static bool is_ctl(int c);
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/// Check if a byte is defined as an HTTP tspecial character.
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static bool is_tspecial(int c);
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/// Check if a byte is a digit.
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static bool is_digit(int c);
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/// The current state of the parser.
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enum state
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{
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method_start,
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method,
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uri,
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http_version_h,
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http_version_t_1,
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http_version_t_2,
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http_version_p,
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http_version_slash,
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http_version_major_start,
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http_version_major,
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http_version_minor_start,
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http_version_minor,
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expecting_newline_1,
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header_line_start,
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header_lws,
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header_name,
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space_before_header_value,
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header_value,
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expecting_newline_2,
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expecting_newline_3
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} state_;
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};
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} // namespace server
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} // namespace http
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#endif // HTTP_REQUEST_PARSER_HPP
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