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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2019 Vinnie Falco (vinnie.falco@gmail.com) | ||
| 3 | // | ||
| 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) | ||
| 6 | // | ||
| 7 | // Official repository: https://github.com/CPPAlliance/http_proto | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_HTTP_PROTO_DETAIL_IMPL_WORKSPACE_IPP | ||
| 11 | #define BOOST_HTTP_PROTO_DETAIL_IMPL_WORKSPACE_IPP | ||
| 12 | |||
| 13 | #include <boost/http_proto/detail/workspace.hpp> | ||
| 14 | #include <boost/http_proto/detail/except.hpp> | ||
| 15 | #include <boost/assert.hpp> | ||
| 16 | |||
| 17 | namespace boost { | ||
| 18 | namespace http_proto { | ||
| 19 | namespace detail { | ||
| 20 | |||
| 21 | workspace:: | ||
| 22 | any:: | ||
| 23 | ~any() = default; | ||
| 24 | |||
| 25 | 748 | workspace:: | |
| 26 | 748 | ~workspace() | |
| 27 | { | ||
| 28 |
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748 | if(begin_) |
| 29 | { | ||
| 30 | 748 | clear(); | |
| 31 |
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748 | delete[] begin_; |
| 32 | } | ||
| 33 | 748 | } | |
| 34 | |||
| 35 | 12 | workspace:: | |
| 36 | workspace( | ||
| 37 | 12 | std::size_t n) | |
| 38 | 12 | : begin_(new unsigned char[n]) | |
| 39 | 12 | , front_(begin_) | |
| 40 | 12 | , head_(begin_ + n) | |
| 41 | 12 | , back_(head_) | |
| 42 | 12 | , end_(head_) | |
| 43 | { | ||
| 44 | 12 | } | |
| 45 | |||
| 46 | ✗ | workspace:: | |
| 47 | workspace( | ||
| 48 | ✗ | workspace&& other) noexcept | |
| 49 | ✗ | : begin_(other.begin_) | |
| 50 | ✗ | , front_(other.front_) | |
| 51 | ✗ | , head_(other.end_) | |
| 52 | ✗ | , back_(other.back_) | |
| 53 | ✗ | , end_(other.end_) | |
| 54 | { | ||
| 55 | ✗ | other.begin_ = nullptr; | |
| 56 | ✗ | other.front_ = nullptr; | |
| 57 | ✗ | other.head_ = nullptr; | |
| 58 | ✗ | other.back_ = nullptr; | |
| 59 | ✗ | other.end_ = nullptr; | |
| 60 | } | ||
| 61 | |||
| 62 | void | ||
| 63 | 736 | workspace:: | |
| 64 | allocate( | ||
| 65 | std::size_t n) | ||
| 66 | { | ||
| 67 | // Cannot be empty | ||
| 68 |
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736 | if(n == 0) |
| 69 | ✗ | detail::throw_invalid_argument(); | |
| 70 | |||
| 71 | // Already allocated | ||
| 72 |
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736 | if(begin_ != nullptr) |
| 73 | ✗ | detail::throw_logic_error(); | |
| 74 | |||
| 75 | 736 | begin_ = new unsigned char[n]; | |
| 76 | 736 | front_ = begin_; | |
| 77 | 736 | head_ = begin_ + n; | |
| 78 | 736 | back_ = head_; | |
| 79 | 736 | end_ = head_; | |
| 80 | 736 | } | |
| 81 | |||
| 82 | void | ||
| 83 | 1501 | workspace:: | |
| 84 | clear() noexcept | ||
| 85 | { | ||
| 86 |
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1501 | if(! begin_) |
| 87 | ✗ | return; | |
| 88 | |||
| 89 | 1501 | auto const end = | |
| 90 | reinterpret_cast< | ||
| 91 | any const*>(back_); | ||
| 92 | 1501 | auto p = | |
| 93 | reinterpret_cast< | ||
| 94 | any const*>(head_); | ||
| 95 |
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1538 | while(p != end) |
| 96 | { | ||
| 97 | 37 | auto next = p->next; | |
| 98 | 37 | p->~any(); | |
| 99 | 37 | p = next; | |
| 100 | } | ||
| 101 | 1501 | front_ = begin_; | |
| 102 | 1501 | head_ = end_; | |
| 103 | 1501 | back_ = end_; | |
| 104 | } | ||
| 105 | |||
| 106 | void* | ||
| 107 | 6 | workspace:: | |
| 108 | reserve_front( | ||
| 109 | std::size_t n) | ||
| 110 | { | ||
| 111 | // | ||
| 112 | // Requested size exceeds available space. | ||
| 113 | // Note you can never reserve the last byte. | ||
| 114 |
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6 | if(n >= size()) |
| 115 | ✗ | detail::throw_length_error(); | |
| 116 | |||
| 117 | 6 | auto const p = front_; | |
| 118 | 6 | front_ += n ; | |
| 119 | 6 | return p; | |
| 120 | } | ||
| 121 | |||
| 122 | void* | ||
| 123 | ✗ | workspace:: | |
| 124 | reserve_back( | ||
| 125 | std::size_t n) | ||
| 126 | { | ||
| 127 | // can't reserve after acquire | ||
| 128 | ✗ | if(head_ != end_) | |
| 129 | ✗ | detail::throw_logic_error(); | |
| 130 | |||
| 131 | // can't reserve twice | ||
| 132 | ✗ | if(back_ != end_) | |
| 133 | ✗ | detail::throw_logic_error(); | |
| 134 | |||
| 135 | // over capacity | ||
| 136 | ✗ | std::size_t const lim = | |
| 137 | ✗ | head_ - front_; | |
| 138 | ✗ | if(n >= lim) | |
| 139 | ✗ | detail::throw_length_error(); | |
| 140 | |||
| 141 | ✗ | head_ -= n; | |
| 142 | ✗ | back_ = head_; | |
| 143 | ✗ | return back_; | |
| 144 | } | ||
| 145 | |||
| 146 | // https://fitzgeraldnick.com/2019/11/01/always-bump-downwards.html | ||
| 147 | void* | ||
| 148 | 37 | workspace:: | |
| 149 | bump_down( | ||
| 150 | std::size_t size, | ||
| 151 | std::size_t align) | ||
| 152 | { | ||
| 153 |
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37 | BOOST_ASSERT(align > 0); |
| 154 |
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37 | BOOST_ASSERT( |
| 155 | (align & (align - 1)) == 0); | ||
| 156 |
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37 | BOOST_ASSERT(front_); |
| 157 | |||
| 158 | 37 | auto ip0 = reinterpret_cast< | |
| 159 | 37 | std::uintptr_t>(front_); | |
| 160 | 37 | auto ip = reinterpret_cast< | |
| 161 | 37 | std::uintptr_t>(head_); | |
| 162 | |||
| 163 | // If you get an exception here, it | ||
| 164 | // means that a buffer was too small | ||
| 165 | // for your workload. Increase the | ||
| 166 | // buffer size. | ||
| 167 |
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37 | if(size > ip - ip0) |
| 168 | ✗ | detail::throw_bad_alloc(); | |
| 169 | |||
| 170 | 37 | ip -= size; | |
| 171 | 37 | ip &= ~(align - 1); | |
| 172 | |||
| 173 | // If you get an exception here, it | ||
| 174 | // means that a buffer was too small | ||
| 175 | // for your workload. Increase the | ||
| 176 | // buffer size. | ||
| 177 |
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37 | if(ip < ip0) |
| 178 | ✗ | detail::throw_bad_alloc(); | |
| 179 | |||
| 180 | 37 | return reinterpret_cast<void*>(ip); | |
| 181 | } | ||
| 182 | |||
| 183 | } // detail | ||
| 184 | } // http_proto | ||
| 185 | } // boost | ||
| 186 | |||
| 187 | #endif | ||
| 188 |