ceph/src/boost/libs/asio/example/cpp03/http/server2/request_parser.hpp

   1 //
   2 // request_parser.hpp
   3 // ~~~~~~~~~~~~~~~~~~
   4 //
   5 // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff dot com)
   6 //
   7 // Distributed under the Boost Software License, Version 1.0. (See accompanying
   8 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
   9 //
  10
  11 #ifndef HTTP_SERVER2_REQUEST_PARSER_HPP
  12 #define HTTP_SERVER2_REQUEST_PARSER_HPP
  13
  14 #include <boost/logic/tribool.hpp>
  15 #include <boost/tuple/tuple.hpp>
  16
  17 namespace http {
  18 namespace server2 {
  19
  20 struct request;
  21
  22 /// Parser for incoming requests.
  23 class request_parser
  24 {
  25 public:
  26   /// Construct ready to parse the request method.
  27   request_parser();
  28
  29   /// Reset to initial parser state.
  30   void reset();
  31
  32   /// Parse some data. The tribool return value is true when a complete request
  33   /// has been parsed, false if the data is invalid, indeterminate when more
  34   /// data is required. The InputIterator return value indicates how much of the
  35   /// input has been consumed.
  36   template <typename InputIterator>
  37   boost::tuple<boost::tribool, InputIterator> parse(request& req,
  38       InputIterator begin, InputIterator end)
  39   {
  40     while (begin != end)
  41     {
  42       boost::tribool result = consume(req, *begin++);
  43       if (result || !result)
  44         return boost::make_tuple(result, begin);
  45     }
  46     boost::tribool result = boost::indeterminate;
  47     return boost::make_tuple(result, begin);
  48   }
  49
  50 private:
  51   /// Handle the next character of input.
  52   boost::tribool consume(request& req, char input);
  53
  54   /// Check if a byte is an HTTP character.
  55   static bool is_char(int c);
  56
  57   /// Check if a byte is an HTTP control character.
  58   static bool is_ctl(int c);
  59
  60   /// Check if a byte is defined as an HTTP tspecial character.
  61   static bool is_tspecial(int c);
  62
  63   /// Check if a byte is a digit.
  64   static bool is_digit(int c);
  65
  66   /// The current state of the parser.
  67   enum state
  68   {
  69     method_start,
  70     method,
  71     uri,
  72     http_version_h,
  73     http_version_t_1,
  74     http_version_t_2,
  75     http_version_p,
  76     http_version_slash,
  77     http_version_major_start,
  78     http_version_major,
  79     http_version_minor_start,
  80     http_version_minor,
  81     expecting_newline_1,
  82     header_line_start,
  83     header_lws,
  84     header_name,
  85     space_before_header_value,
  86     header_value,
  87     expecting_newline_2,
  88     expecting_newline_3
  89   } state_;
  90 };
  91
  92 } // namespace server2
  93 } // namespace http
  94
  95 #endif // HTTP_SERVER2_REQUEST_PARSER_HPP