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- //
- // request_parser.cpp
- // ~~~~~~~~~~~~~~~~~~
- //
- // Copyright (c) 2003-2019 Christopher M. Kohlhoff (chris at kohlhoff 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)
- //
- #include "request_parser.hpp"
- #include "request.hpp"
- namespace http {
- namespace server {
- request_parser::request_parser()
- : state_(method_start)
- {
- }
- void request_parser::reset()
- {
- state_ = method_start;
- }
- request_parser::result_type request_parser::consume(request& req, char input)
- {
- switch (state_)
- {
- case method_start:
- if (!is_char(input) || is_ctl(input) || is_tspecial(input))
- {
- return bad;
- }
- else
- {
- state_ = method;
- req.method.push_back(input);
- return indeterminate;
- }
- case method:
- if (input == ' ')
- {
- state_ = uri;
- return indeterminate;
- }
- else if (!is_char(input) || is_ctl(input) || is_tspecial(input))
- {
- return bad;
- }
- else
- {
- req.method.push_back(input);
- return indeterminate;
- }
- case uri:
- if (input == ' ')
- {
- state_ = http_version_h;
- return indeterminate;
- }
- else if (is_ctl(input))
- {
- return bad;
- }
- else
- {
- req.uri.push_back(input);
- return indeterminate;
- }
- case http_version_h:
- if (input == 'H')
- {
- state_ = http_version_t_1;
- return indeterminate;
- }
- else
- {
- return bad;
- }
- case http_version_t_1:
- if (input == 'T')
- {
- state_ = http_version_t_2;
- return indeterminate;
- }
- else
- {
- return bad;
- }
- case http_version_t_2:
- if (input == 'T')
- {
- state_ = http_version_p;
- return indeterminate;
- }
- else
- {
- return bad;
- }
- case http_version_p:
- if (input == 'P')
- {
- state_ = http_version_slash;
- return indeterminate;
- }
- else
- {
- return bad;
- }
- case http_version_slash:
- if (input == '/')
- {
- req.http_version_major = 0;
- req.http_version_minor = 0;
- state_ = http_version_major_start;
- return indeterminate;
- }
- else
- {
- return bad;
- }
- case http_version_major_start:
- if (is_digit(input))
- {
- req.http_version_major = req.http_version_major * 10 + input - '0';
- state_ = http_version_major;
- return indeterminate;
- }
- else
- {
- return bad;
- }
- case http_version_major:
- if (input == '.')
- {
- state_ = http_version_minor_start;
- return indeterminate;
- }
- else if (is_digit(input))
- {
- req.http_version_major = req.http_version_major * 10 + input - '0';
- return indeterminate;
- }
- else
- {
- return bad;
- }
- case http_version_minor_start:
- if (is_digit(input))
- {
- req.http_version_minor = req.http_version_minor * 10 + input - '0';
- state_ = http_version_minor;
- return indeterminate;
- }
- else
- {
- return bad;
- }
- case http_version_minor:
- if (input == '\r')
- {
- state_ = expecting_newline_1;
- return indeterminate;
- }
- else if (is_digit(input))
- {
- req.http_version_minor = req.http_version_minor * 10 + input - '0';
- return indeterminate;
- }
- else
- {
- return bad;
- }
- case expecting_newline_1:
- if (input == '\n')
- {
- state_ = header_line_start;
- return indeterminate;
- }
- else
- {
- return bad;
- }
- case header_line_start:
- if (input == '\r')
- {
- state_ = expecting_newline_3;
- return indeterminate;
- }
- else if (!req.headers.empty() && (input == ' ' || input == '\t'))
- {
- state_ = header_lws;
- return indeterminate;
- }
- else if (!is_char(input) || is_ctl(input) || is_tspecial(input))
- {
- return bad;
- }
- else
- {
- req.headers.push_back(header());
- req.headers.back().name.push_back(input);
- state_ = header_name;
- return indeterminate;
- }
- case header_lws:
- if (input == '\r')
- {
- state_ = expecting_newline_2;
- return indeterminate;
- }
- else if (input == ' ' || input == '\t')
- {
- return indeterminate;
- }
- else if (is_ctl(input))
- {
- return bad;
- }
- else
- {
- state_ = header_value;
- req.headers.back().value.push_back(input);
- return indeterminate;
- }
- case header_name:
- if (input == ':')
- {
- state_ = space_before_header_value;
- return indeterminate;
- }
- else if (!is_char(input) || is_ctl(input) || is_tspecial(input))
- {
- return bad;
- }
- else
- {
- req.headers.back().name.push_back(input);
- return indeterminate;
- }
- case space_before_header_value:
- if (input == ' ')
- {
- state_ = header_value;
- return indeterminate;
- }
- else
- {
- return bad;
- }
- case header_value:
- if (input == '\r')
- {
- state_ = expecting_newline_2;
- return indeterminate;
- }
- else if (is_ctl(input))
- {
- return bad;
- }
- else
- {
- req.headers.back().value.push_back(input);
- return indeterminate;
- }
- case expecting_newline_2:
- if (input == '\n')
- {
- state_ = header_line_start;
- return indeterminate;
- }
- else
- {
- return bad;
- }
- case expecting_newline_3:
- return (input == '\n') ? good : bad;
- default:
- return bad;
- }
- }
- bool request_parser::is_char(int c)
- {
- return c >= 0 && c <= 127;
- }
- bool request_parser::is_ctl(int c)
- {
- return (c >= 0 && c <= 31) || (c == 127);
- }
- bool request_parser::is_tspecial(int c)
- {
- switch (c)
- {
- case '(': case ')': case '<': case '>': case '@':
- case ',': case ';': case ':': case '\\': case '"':
- case '/': case '[': case ']': case '?': case '=':
- case '{': case '}': case ' ': case '\t':
- return true;
- default:
- return false;
- }
- }
- bool request_parser::is_digit(int c)
- {
- return c >= '0' && c <= '9';
- }
- } // namespace server
- } // namespace http
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