1 + 
//
 
2 + 
// Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com)
 
3 + 
// Copyright (c) 2024 Alan de Freitas (alandefreitas@gmail.com)
 
4 + 
//
 
5 + 
// Distributed under the Boost Software License, Version 1.0. (See accompanying
 
6 + 
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
 
7 + 
//
 
8 + 
// Official repository: https://github.com/boostorg/url
 
9 + 
//
 
10 +
 
11 + 
#ifndef BOOST_URL_RFC_IMPL_IPV6_ADDRESS_RULE_HPP
 
12 + 
#define BOOST_URL_RFC_IMPL_IPV6_ADDRESS_RULE_HPP
 
13 +
 
14 + 
#include <boost/url/detail/config.hpp>
 
15 + 
#include <boost/url/rfc/ipv4_address_rule.hpp>
 
16 + 
#include <boost/url/rfc/detail/h16_rule.hpp>
 
17 + 
#include <boost/url/grammar/charset.hpp>
 
18 + 
#include <boost/url/grammar/hexdig_chars.hpp>
 
19 + 
#include <boost/url/grammar/error.hpp>
 
20 + 
#include <boost/url/grammar/parse.hpp>
 
21 + 
#include <boost/assert.hpp>
 
22 + 
#include <cstring>
 
23 +
 
24 + 
namespace boost {
 
25 + 
namespace urls {
 
26 +
 
27 + 
namespace detail {
 
28 +
 
29 + 
inline BOOST_URL_CXX20_CONSTEXPR
 
30 + 
bool
 
31 + 
maybe_octet(
 
32 + 
    unsigned char const* p) noexcept
 
33 + 
{
 
34 + 
    unsigned short word =
 
35 + 
        static_cast<unsigned short>(
 
36 + 
            p[0]) * 256 +
 
37 + 
        static_cast<unsigned short>(
 
38 + 
            p[1]);
 
39 + 
    if(word > 0x255)
 
40 + 
        return false;
 
41 + 
    if(((word >>  4) & 0xf) > 9)
 
42 + 
        return false;
 
43 + 
    if((word & 0xf) > 9)
 
44 + 
        return false;
 
45 + 
    return true;
 
46 + 
}
 
47 +
 
48 + 
} // detail
 
49 +
 
50 + 
inline BOOST_URL_CXX20_CONSTEXPR
 
51 + 
auto
 
52 + 
implementation_defined::ipv6_address_rule_t::
 
53 + 
parse(
 
54 + 
    char const*& it,
 
55 + 
    char const* const end
 
56 + 
        ) const noexcept ->
 
57 + 
    system::result<ipv6_address>
 
58 + 
{
 
59 + 
    int n = 8;
 
60 + 
    int b = -1;
 
61 + 
    bool c = false;
 
62 + 
    auto prev = it;
 
63 + 
    ipv6_address::bytes_type bytes;
 
64 + 
    system::result<detail::h16_rule_t::value_type> rv;
 
65 + 
    for(;;)
 
66 + 
    {
 
67 + 
        if(it == end)
 
68 + 
        {
 
69 + 
            if(b != -1)
 
70 + 
            {
 
71 + 
                break;
 
72 + 
            }
 
73 + 
            BOOST_ASSERT(n > 0);
 
74 + 
            BOOST_URL_CONSTEXPR_RETURN_EC(
 
75 + 
                grammar::error::invalid);
 
76 + 
        }
 
77 + 
        if(*it == ':')
 
78 + 
        {
 
79 + 
            ++it;
 
80 + 
            if(it == end)
 
81 + 
            {
 
82 + 
                BOOST_URL_CONSTEXPR_RETURN_EC(
 
83 + 
                    grammar::error::invalid);
 
84 + 
            }
 
85 + 
            if(*it == ':')
 
86 + 
            {
 
87 + 
                if(b == -1)
 
88 + 
                {
 
89 + 
                    ++it;
 
90 + 
                    --n;
 
91 + 
                    b = n;
 
92 + 
                    if(n == 0)
 
93 + 
                        break;
 
94 + 
                    c = false;
 
95 + 
                    continue;
 
96 + 
                }
 
97 + 
                BOOST_URL_CONSTEXPR_RETURN_EC(
 
98 + 
                    grammar::error::invalid);
 
99 + 
            }
 
100 + 
            if(c)
 
101 + 
            {
 
102 + 
                prev = it;
 
103 + 
                rv = grammar::parse(
 
104 + 
                    it, end,
 
105 + 
                    detail::h16_rule);
 
106 + 
                if(! rv)
 
107 + 
                    return rv.error();
 
108 + 
                bytes[2*(8-n)+0] = rv->hi;
 
109 + 
                bytes[2*(8-n)+1] = rv->lo;
 
110 + 
                --n;
 
111 + 
                if(n == 0)
 
112 + 
                    break;
 
113 + 
                continue;
 
114 + 
            }
 
115 + 
            BOOST_URL_CONSTEXPR_RETURN_EC(
 
116 + 
                grammar::error::invalid);
 
117 + 
        }
 
118 + 
        if(*it == '.')
 
119 + 
        {
 
120 + 
            if(b == -1 && n > 1)
 
121 + 
            {
 
122 + 
                BOOST_URL_CONSTEXPR_RETURN_EC(
 
123 + 
                    grammar::error::invalid);
 
124 + 
            }
 
125 + 
            if(! detail::maybe_octet(
 
126 + 
                &bytes[2*(7-n)]))
 
127 + 
            {
 
128 + 
                BOOST_URL_CONSTEXPR_RETURN_EC(
 
129 + 
                    grammar::error::invalid);
 
130 + 
            }
 
131 + 
            it = prev;
 
132 + 
            auto rv1 = grammar::parse(
 
133 + 
                it, end, ipv4_address_rule);
 
134 + 
            if(! rv1)
 
135 + 
                return rv1.error();
 
136 + 
            auto v4 = *rv1;
 
137 + 
            auto const b4 =
 
138 + 
                v4.to_bytes();
 
139 + 
            bytes[2*(7-n)+0] = b4[0];
 
140 + 
            bytes[2*(7-n)+1] = b4[1];
 
141 + 
            bytes[2*(7-n)+2] = b4[2];
 
142 + 
            bytes[2*(7-n)+3] = b4[3];
 
143 + 
            --n;
 
144 + 
            break;
 
145 + 
        }
 
146 + 
        auto d =
 
147 + 
            grammar::hexdig_value(*it);
 
148 + 
        if( b != -1 &&
 
149 + 
            d < 0)
 
150 + 
        {
 
151 + 
            break;
 
152 + 
        }
 
153 + 
        if(! c)
 
154 + 
        {
 
155 + 
            prev = it;
 
156 + 
            rv = grammar::parse(
 
157 + 
                it, end,
 
158 + 
                detail::h16_rule);
 
159 + 
            if(! rv)
 
160 + 
                return rv.error();
 
161 + 
            bytes[2*(8-n)+0] = rv->hi;
 
162 + 
            bytes[2*(8-n)+1] = rv->lo;
 
163 + 
            --n;
 
164 + 
            if(n == 0)
 
165 + 
                break;
 
166 + 
            c = true;
 
167 + 
            continue;
 
168 + 
        }
 
169 + 
        BOOST_URL_CONSTEXPR_RETURN_EC(
 
170 + 
            grammar::error::invalid);
 
171 + 
    }
 
172 + 
    if(b == -1)
 
173 + 
        return ipv6_address{bytes};
 
174 + 
    if(b == n)
 
175 + 
    {
 
176 + 
        auto const i =
 
177 + 
            2 * (7 - n);
 
178 + 
        std::memset(
 
179 + 
            &bytes[i],
 
180 + 
            0, 16 - i);
 
181 + 
    }
 
182 + 
    else if(b == 7)
 
183 + 
    {
 
184 + 
        auto const i =
 
185 + 
            2 * (b - n);
 
186 + 
        std::memmove(
 
187 + 
            &bytes[16 - i],
 
188 + 
            &bytes[2],
 
189 + 
            i);
 
190 + 
        std::memset(
 
191 + 
            &bytes[0],
 
192 + 
            0, 16 - i);
 
193 + 
    }
 
194 + 
    else
 
195 + 
    {
 
196 + 
        auto const i0 =
 
197 + 
            2 * (7 - b);
 
198 + 
        auto const i1 =
 
199 + 
            2 * (b - n);
 
200 + 
        std::memmove(
 
201 + 
            &bytes[16 - i1],
 
202 + 
            &bytes[i0 + 2],
 
203 + 
            i1);
 
204 + 
        std::memset(
 
205 + 
            &bytes[i0],
 
206 + 
            0, 16 - (i0 + i1));
 
207 + 
    }
 
208 + 
    return ipv6_address{bytes};
 
209 + 
}
 
210 +
 
211 + 
} // urls
 
212 + 
} // boost
 
213 +
 
214 +
 
215 + 
#endif