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
18   
header_limits::
18   
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)
67   
    return Align * (
67   
    return Align * (
68   
        (max_size + Align - 1) / Align) + (
68   
        (max_size + Align - 1) / Align) + (
69   
            max_fields * sizeof(
69   
            max_fields * sizeof(
70   
                detail::header::entry));
70   
                detail::header::entry));
71   
}
71   
}
72  
72  
73   
} // http
73   
} // http
74   
} // boost
74   
} // boost