http/detail/basic_parser.hpp

0001 //
0002 // Copyright (c) 2016-2019 Vinnie Falco (vinnie dot falco at gmail dot com)
0003 //
0004 // Distributed under the Boost Software License, Version 1.0. (See accompanying
0005 // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
0006 //
0007 // Official repository: https://github.com/boostorg/beast
0008 //
0009
0010 #ifndef BOOST_BEAST_HTTP_DETAIL_BASIC_PARSER_HPP
0011 #define BOOST_BEAST_HTTP_DETAIL_BASIC_PARSER_HPP
0012
0013 #include <boost/beast/core/string.hpp>
0014 #include <boost/beast/core/detail/char_buffer.hpp>
0015 #include <boost/beast/http/error.hpp>
0016 #include <boost/beast/http/detail/rfc7230.hpp>
0017 #include <boost/config.hpp>
0018 #include <boost/version.hpp>
0019 #include <cstddef>
0020 #include <utility>
0021
0022 namespace boost {
0023 namespace beast {
0024 namespace http {
0025 namespace detail {
0026
0027 struct basic_parser_base
0028 {
0029     // limit on the size of the obs-fold buffer
0030     //
0031     // https://stackoverflow.com/questions/686217/maximum-on-http-header-values
0032     //
0033     static std::size_t constexpr max_obs_fold = 4096;
0034
0035     enum class state
0036     {
0037         nothing_yet = 0,
0038         start_line,
0039         fields,
0040         body0,
0041         body,
0042         body_to_eof0,
0043         body_to_eof,
0044         chunk_header0,
0045         chunk_header,
0046         chunk_body,
0047         complete
0048     };
0049
0050     static
0051     bool
0052     is_digit(char c)
0053     {
0054         return static_cast<unsigned char>(c-'0') < 10;
0055     }
0056
0057     static
0058     bool
0059     is_print(char c)
0060     {
0061         return static_cast<unsigned char>(c-32) < 95;
0062     }
0063
0064     BOOST_BEAST_DECL
0065     static
0066     char const*
0067     trim_front(char const* it, char const* end);
0068
0069     BOOST_BEAST_DECL
0070     static
0071     char const*
0072     trim_back(
0073         char const* it, char const* first);
0074
0075     static
0076     string_view
0077     make_string(char const* first, char const* last)
0078     {
0079         return {first, static_cast<
0080             std::size_t>(last - first)};
0081     }
0082
0083     //--------------------------------------------------------------------------
0084
0085     BOOST_BEAST_DECL
0086     static
0087     bool
0088     is_pathchar(char c);
0089
0090     BOOST_BEAST_DECL
0091     static
0092     bool
0093     unhex(unsigned char& d, char c);
0094
0095     BOOST_BEAST_DECL
0096     static
0097     std::pair<char const*, bool>
0098     find_fast(
0099         char const* buf,
0100         char const* buf_end,
0101         char const* ranges,
0102         size_t ranges_size);
0103
0104     BOOST_BEAST_DECL
0105     static
0106     char const*
0107     find_eol(
0108         char const* it, char const* last,
0109             error_code& ec);
0110
0111     BOOST_BEAST_DECL
0112     static
0113     char const*
0114     find_eom(char const* p, char const* last);
0115
0116     //--------------------------------------------------------------------------
0117
0118     BOOST_BEAST_DECL
0119     static
0120     char const*
0121     parse_token_to_eol(
0122         char const* p,
0123         char const* last,
0124         char const*& token_last,
0125         error_code& ec);
0126
0127     BOOST_BEAST_DECL
0128     static
0129     bool
0130     parse_dec(string_view s, std::uint64_t& v);
0131
0132     BOOST_BEAST_DECL
0133     static
0134     bool
0135     parse_hex(char const*& it, std::uint64_t& v);
0136
0137     BOOST_BEAST_DECL
0138     static
0139     bool
0140     parse_crlf(char const*& it);
0141
0142     BOOST_BEAST_DECL
0143     static
0144     void
0145     parse_method(
0146         char const*& it, char const* last,
0147         string_view& result, error_code& ec);
0148
0149     BOOST_BEAST_DECL
0150     static
0151     void
0152     parse_target(
0153         char const*& it, char const* last,
0154         string_view& result, error_code& ec);
0155
0156     BOOST_BEAST_DECL
0157     static
0158     void
0159     parse_version(
0160         char const*& it, char const* last,
0161         int& result, error_code& ec);
0162
0163     BOOST_BEAST_DECL
0164     static
0165     void
0166     parse_status(
0167         char const*& it, char const* last,
0168         unsigned short& result, error_code& ec);
0169
0170     BOOST_BEAST_DECL
0171     static
0172     void
0173     parse_reason(
0174         char const*& it, char const* last,
0175         string_view& result, error_code& ec);
0176
0177     BOOST_BEAST_DECL
0178     static
0179     void
0180     parse_field(
0181         char const*& p,
0182         char const* last,
0183         string_view& name,
0184         string_view& value,
0185         beast::detail::char_buffer<max_obs_fold>& buf,
0186         error_code& ec);
0187
0188     BOOST_BEAST_DECL
0189     static
0190     void
0191     parse_chunk_extensions(
0192         char const*& it,
0193         char const* last,
0194         error_code& ec);
0195 };
0196
0197 } // detail
0198 } // http
0199 } // beast
0200 } // boost
0201
0202 #ifdef BOOST_BEAST_HEADER_ONLY
0203 #include <boost/beast/http/detail/basic_parser.ipp>
0204 #endif
0205
0206 #endif