. /src /header_limits.cpp
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1   // 1   //
2   // Copyright (c) 2021 Vinnie Falco (vinnie.falco@gmail.com) 2   // Copyright (c) 2021 Vinnie Falco (vinnie.falco@gmail.com)
3   // 3   //
4   // Distributed under the Boost Software License, Version 1.0. (See accompanying 4   // Distributed under the Boost Software License, Version 1.0. (See accompanying
5   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) 5   // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
6   // 6   //
7   // Official repository: https://github.com/cppalliance/http 7   // Official repository: https://github.com/cppalliance/http
8   // 8   //
9   9  
10   #include <boost/http/header_limits.hpp> 10   #include <boost/http/header_limits.hpp>
11   #include <boost/http/detail/except.hpp> 11   #include <boost/http/detail/except.hpp>
12   #include <boost/http/detail/header.hpp> 12   #include <boost/http/detail/header.hpp>
13   13  
14   namespace boost { 14   namespace boost {
15   namespace http { 15   namespace http {
16   16  
17   std::size_t 17   std::size_t
HITCBC 18   113 header_limits:: 18   115 header_limits::
19   valid_space_needed() const 19   valid_space_needed() const
20   { 20   {
21   /* 21   /*
22   // "HTTP/1.1 200 OK\r\n\r\n" = 19 22   // "HTTP/1.1 200 OK\r\n\r\n" = 19
23   // "X / HTTP/1.1\r\n" = 14 23   // "X / HTTP/1.1\r\n" = 14
24   // "HTTP/1.1 200\r\n" = 14 24   // "HTTP/1.1 200\r\n" = 14
25   // "X:\r\n" = 4 25   // "X:\r\n" = 4
26   26  
27   // make sure `size` is big enough 27   // make sure `size` is big enough
28   // to hold the largest default buffer: 28   // to hold the largest default buffer:
29   //if( max_size < 19) 29   //if( max_size < 19)
30   //max_size = 19; 30   //max_size = 19;
31   31  
32   // max_size too small 32   // max_size too small
33   if( max_size < 19) 33   if( max_size < 19)
34   detail::throw_invalid_argument(); 34   detail::throw_invalid_argument();
35   35  
36   // max_size too large 36   // max_size too large
37   if( max_size > 37   if( max_size >
38   BOOST_HTTP_MAX_HEADER) 38   BOOST_HTTP_MAX_HEADER)
39   detail::throw_invalid_argument(); 39   detail::throw_invalid_argument();
40   40  
41   // max_start_line too small 41   // max_start_line too small
42   if( max_start_line < 14) 42   if( max_start_line < 14)
43   detail::throw_invalid_argument(); 43   detail::throw_invalid_argument();
44   44  
45   // max_start_line too large 45   // max_start_line too large
46   if( max_start_line > 46   if( max_start_line >
47   max_size - 2) 47   max_size - 2)
48   detail::throw_invalid_argument(); 48   detail::throw_invalid_argument();
49   49  
50   // max_field too small 50   // max_field too small
51   if( max_field < 4) 51   if( max_field < 4)
52   detail::throw_invalid_argument(); 52   detail::throw_invalid_argument();
53   53  
54   // max_field too large 54   // max_field too large
55   if( max_field > 55   if( max_field >
56   max_size) 56   max_size)
57   detail::throw_invalid_argument(); 57   detail::throw_invalid_argument();
58   58  
59   // max_fields too large 59   // max_fields too large
60   if( max_fields > 60   if( max_fields >
61   max_size / 4) 61   max_size / 4)
62   detail::throw_invalid_argument(); 62   detail::throw_invalid_argument();
63   */ 63   */
64   static constexpr auto Align = 64   static constexpr auto Align =
65   alignof(detail::header::entry); 65   alignof(detail::header::entry);
66   // round up to alignof(A) 66   // round up to alignof(A)
HITCBC 67   113 return Align * ( 67   115 return Align * (
HITCBC 68   113 (max_size + Align - 1) / Align) + ( 68   115 (max_size + Align - 1) / Align) + (
HITCBC 69   113 max_fields * sizeof( 69   115 max_fields * sizeof(
HITCBC 70   113 detail::header::entry)); 70   115 detail::header::entry));
71   } 71   }
72   72  
73   } // http 73   } // http
74   } // boost 74   } // boost