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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 | #include <boost/http_proto/detail/workspace.hpp> | ||
| 11 | #include <boost/http_proto/detail/except.hpp> | ||
| 12 | #include <boost/assert.hpp> | ||
| 13 | |||
| 14 | namespace boost { | ||
| 15 | namespace http_proto { | ||
| 16 | namespace detail { | ||
| 17 | |||
| 18 | 980 | workspace:: | |
| 19 | any:: | ||
| 20 | ~any() = default; | ||
| 21 | |||
| 22 | 1088 | workspace:: | |
| 23 | ~workspace() | ||
| 24 | { | ||
| 25 |
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1088 | if(begin_) |
| 26 | { | ||
| 27 | 1088 | clear(); | |
| 28 |
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1088 | delete[] begin_; |
| 29 | } | ||
| 30 | 1088 | } | |
| 31 | |||
| 32 | 43 | workspace:: | |
| 33 | workspace( | ||
| 34 | 43 | std::size_t n) | |
| 35 | 43 | : begin_(new unsigned char[n]) | |
| 36 | 43 | , front_(begin_) | |
| 37 | 43 | , head_(begin_ + n) | |
| 38 | 43 | , back_(head_) | |
| 39 | 43 | , end_(head_) | |
| 40 | { | ||
| 41 | 43 | } | |
| 42 | |||
| 43 | ✗ | workspace:: | |
| 44 | workspace( | ||
| 45 | ✗ | workspace&& other) noexcept | |
| 46 | ✗ | : begin_(other.begin_) | |
| 47 | ✗ | , front_(other.front_) | |
| 48 | ✗ | , head_(other.end_) | |
| 49 | ✗ | , back_(other.back_) | |
| 50 | ✗ | , end_(other.end_) | |
| 51 | { | ||
| 52 | ✗ | other.begin_ = nullptr; | |
| 53 | ✗ | other.front_ = nullptr; | |
| 54 | ✗ | other.head_ = nullptr; | |
| 55 | ✗ | other.back_ = nullptr; | |
| 56 | ✗ | other.end_ = nullptr; | |
| 57 | ✗ | } | |
| 58 | |||
| 59 | void | ||
| 60 | 1045 | workspace:: | |
| 61 | allocate( | ||
| 62 | std::size_t n) | ||
| 63 | { | ||
| 64 | // Cannot be empty | ||
| 65 |
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1045 | if(n == 0) |
| 66 | ✗ | detail::throw_invalid_argument(); | |
| 67 | |||
| 68 | // Already allocated | ||
| 69 |
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1045 | if(begin_ != nullptr) |
| 70 | ✗ | detail::throw_logic_error(); | |
| 71 | |||
| 72 | 1045 | begin_ = new unsigned char[n]; | |
| 73 | 1045 | front_ = begin_; | |
| 74 | 1045 | head_ = begin_ + n; | |
| 75 | 1045 | back_ = head_; | |
| 76 | 1045 | end_ = head_; | |
| 77 | 1045 | } | |
| 78 | |||
| 79 | void | ||
| 80 | 4569 | workspace:: | |
| 81 | clear() noexcept | ||
| 82 | { | ||
| 83 |
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4569 | if(! begin_) |
| 84 | ✗ | return; | |
| 85 | |||
| 86 | 4569 | auto const end = | |
| 87 | reinterpret_cast< | ||
| 88 | any const*>(back_); | ||
| 89 | 4569 | auto p = | |
| 90 | reinterpret_cast< | ||
| 91 | any const*>(head_); | ||
| 92 |
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5059 | while(p != end) |
| 93 | { | ||
| 94 | 490 | auto next = p->next; | |
| 95 | 490 | p->~any(); | |
| 96 | 490 | p = next; | |
| 97 | } | ||
| 98 | 4569 | front_ = begin_; | |
| 99 | 4569 | head_ = end_; | |
| 100 | 4569 | back_ = end_; | |
| 101 | } | ||
| 102 | |||
| 103 | unsigned char* | ||
| 104 | 1721 | workspace:: | |
| 105 | reserve_front( | ||
| 106 | std::size_t n) | ||
| 107 | { | ||
| 108 | // | ||
| 109 | // Requested size exceeds available space. | ||
| 110 | // Note you can never reserve the last byte. | ||
| 111 |
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1721 | if(n >= size()) |
| 112 | ✗ | detail::throw_length_error(); | |
| 113 | |||
| 114 | 1721 | auto const p = front_; | |
| 115 | 1721 | front_ += n ; | |
| 116 | 1721 | return p; | |
| 117 | } | ||
| 118 | |||
| 119 | unsigned char* | ||
| 120 | 1418 | workspace:: | |
| 121 | reserve_back( | ||
| 122 | std::size_t n) | ||
| 123 | { | ||
| 124 | // can't reserve after acquire | ||
| 125 |
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1418 | if(head_ != end_) |
| 126 | ✗ | detail::throw_logic_error(); | |
| 127 | |||
| 128 | // can't reserve twice | ||
| 129 |
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1418 | if(back_ != end_) |
| 130 | ✗ | detail::throw_logic_error(); | |
| 131 | |||
| 132 | // over capacity | ||
| 133 | 1418 | std::size_t const lim = | |
| 134 | 1418 | head_ - front_; | |
| 135 |
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1418 | if(n >= lim) |
| 136 | ✗ | detail::throw_length_error(); | |
| 137 | |||
| 138 | 1418 | head_ -= n; | |
| 139 | 1418 | back_ = head_; | |
| 140 | 1418 | return back_; | |
| 141 | } | ||
| 142 | |||
| 143 | // https://fitzgeraldnick.com/2019/11/01/always-bump-downwards.html | ||
| 144 | unsigned char* | ||
| 145 | 490 | workspace:: | |
| 146 | bump_down( | ||
| 147 | std::size_t size, | ||
| 148 | std::size_t align) | ||
| 149 | { | ||
| 150 |
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490 | BOOST_ASSERT(align > 0); |
| 151 |
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490 | BOOST_ASSERT( |
| 152 | (align & (align - 1)) == 0); | ||
| 153 |
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490 | BOOST_ASSERT(front_); |
| 154 | |||
| 155 | 490 | auto ip0 = reinterpret_cast< | |
| 156 | 490 | std::uintptr_t>(front_); | |
| 157 | 490 | auto ip = reinterpret_cast< | |
| 158 | 490 | std::uintptr_t>(head_); | |
| 159 | |||
| 160 | // If you get an exception here, it | ||
| 161 | // means that a buffer was too small | ||
| 162 | // for your workload. Increase the | ||
| 163 | // buffer size. | ||
| 164 |
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490 | if(size > ip - ip0) |
| 165 | ✗ | detail::throw_bad_alloc(); | |
| 166 | |||
| 167 | 490 | ip -= size; | |
| 168 | 490 | ip &= ~(align - 1); | |
| 169 | |||
| 170 | // If you get an exception here, it | ||
| 171 | // means that a buffer was too small | ||
| 172 | // for your workload. Increase the | ||
| 173 | // buffer size. | ||
| 174 |
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490 | if(ip < ip0) |
| 175 | ✗ | detail::throw_bad_alloc(); | |
| 176 | |||
| 177 | return reinterpret_cast< | ||
| 178 | 490 | unsigned char*>(ip); | |
| 179 | } | ||
| 180 | |||
| 181 | } // detail | ||
| 182 | } // http_proto | ||
| 183 | } // boost | ||
| 184 |