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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2025 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/capy | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_CAPY_BUFFERS_SLICE_HPP | ||
| 11 | #define BOOST_CAPY_BUFFERS_SLICE_HPP | ||
| 12 | |||
| 13 | #include <boost/capy/detail/config.hpp> | ||
| 14 | #include <boost/capy/buffers.hpp> | ||
| 15 | #include <boost/capy/buffers/range.hpp> | ||
| 16 | #include <boost/assert.hpp> | ||
| 17 | #include <array> | ||
| 18 | #include <iterator> | ||
| 19 | #include <type_traits> | ||
| 20 | |||
| 21 | namespace boost { | ||
| 22 | namespace capy { | ||
| 23 | |||
| 24 | template<class T> class slice_of; | ||
| 25 | |||
| 26 | namespace detail { | ||
| 27 | |||
| 28 | template<class T, class = void> | ||
| 29 | struct has_tag_invoke : std::false_type {}; | ||
| 30 | |||
| 31 | template<class T> | ||
| 32 | struct has_tag_invoke<T, decltype(tag_invoke( | ||
| 33 | std::declval<slice_tag const&>(), | ||
| 34 | std::declval<T&>(), | ||
| 35 | std::declval<slice_how>(), | ||
| 36 | std::declval<std::size_t>()))> | ||
| 37 | : std::true_type {}; | ||
| 38 | |||
| 39 | } // detail | ||
| 40 | |||
| 41 | /** Alias for the type representing a slice of T | ||
| 42 | */ | ||
| 43 | template<class T> | ||
| 44 | using slice_type = std::conditional_t< | ||
| 45 | detail::has_tag_invoke<T>::value, | ||
| 46 | T, slice_of<T>>; | ||
| 47 | |||
| 48 | //------------------------------------------------ | ||
| 49 | |||
| 50 | /** A wrapper enabling a buffer sequence to be consumed | ||
| 51 | */ | ||
| 52 | template<const_buffer_sequence BufferSequence> | ||
| 53 | class slice_of<BufferSequence> | ||
| 54 | { | ||
| 55 | static_assert(!std::is_const_v<BufferSequence>, | ||
| 56 | "BufferSequence can't be const"); | ||
| 57 | |||
| 58 | static_assert(!std::is_reference_v<BufferSequence>, | ||
| 59 | "BufferSequence can't be a reference"); | ||
| 60 | |||
| 61 | using iter_type = decltype( | ||
| 62 | std::declval<BufferSequence const&>().begin()); | ||
| 63 | |||
| 64 | using difference_type = | ||
| 65 | typename std::iterator_traits<iter_type>::difference_type; | ||
| 66 | |||
| 67 | BufferSequence bs_; | ||
| 68 | difference_type begin_ = 0; // index of first buffer in sequence | ||
| 69 | difference_type end_ = 0; // 1 + index of last buffer in sequence | ||
| 70 | std::size_t len_ = 0; // length of bs_ | ||
| 71 | std::size_t size_ = 0; // total bytes | ||
| 72 | std::size_t prefix_ = 0; // used prefix bytes | ||
| 73 | std::size_t suffix_ = 0; // used suffix bytes | ||
| 74 | |||
| 75 | public: | ||
| 76 | /** The type of values returned by iterators | ||
| 77 | */ | ||
| 78 | using value_type = std::conditional_t< | ||
| 79 | mutable_buffer_sequence<BufferSequence>, | ||
| 80 | mutable_buffer, const_buffer>; | ||
| 81 | |||
| 82 | /** The type of returned iterators | ||
| 83 | */ | ||
| 84 | class const_iterator | ||
| 85 | { | ||
| 86 | iter_type it_; | ||
| 87 | // VFALCO we could just point back to | ||
| 88 | // the original sequence to save size | ||
| 89 | std::size_t prefix_ = 0; | ||
| 90 | std::size_t suffix_ = 0; | ||
| 91 | std::size_t i_ = 0; | ||
| 92 | std::size_t n_ = 0; | ||
| 93 | |||
| 94 | friend class slice_of<BufferSequence>; | ||
| 95 | |||
| 96 | 6414788 | const_iterator( | |
| 97 | iter_type it, | ||
| 98 | std::size_t prefix__, | ||
| 99 | std::size_t suffix__, | ||
| 100 | std::size_t i, | ||
| 101 | std::size_t n) noexcept | ||
| 102 | 6414788 | : it_(it) | |
| 103 | 6414788 | , prefix_(prefix__) | |
| 104 | 6414788 | , suffix_(suffix__) | |
| 105 | 6414788 | , i_(i) | |
| 106 | 6414788 | , n_(n) | |
| 107 | { | ||
| 108 | // n_ is the index of the end iterator | ||
| 109 | 6414788 | } | |
| 110 | |||
| 111 | public: | ||
| 112 | using value_type = typename slice_of::value_type; | ||
| 113 | using reference = value_type; | ||
| 114 | using pointer = void; | ||
| 115 | using difference_type = std::ptrdiff_t; | ||
| 116 | using iterator_category = | ||
| 117 | std::bidirectional_iterator_tag; | ||
| 118 | using iterator_concept = std::bidirectional_iterator_tag; | ||
| 119 | |||
| 120 | const_iterator() = default; | ||
| 121 | |||
| 122 | bool | ||
| 123 | 7781869 | operator==( | |
| 124 | const_iterator const& other) const noexcept | ||
| 125 | { | ||
| 126 | return | ||
| 127 | 10986981 | it_ == other.it_ && | |
| 128 |
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3207394 | prefix_ == other.prefix_ && |
| 129 |
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3207394 | suffix_ == other.suffix_ && |
| 130 |
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14196657 | i_ == other.i_ && |
| 131 |
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10989263 | n_ == other.n_; |
| 132 | } | ||
| 133 | |||
| 134 | bool | ||
| 135 | 7781869 | operator!=( | |
| 136 | const_iterator const& other) const noexcept | ||
| 137 | { | ||
| 138 | 7781869 | return !(*this == other); | |
| 139 | } | ||
| 140 | |||
| 141 | reference | ||
| 142 | 4574475 | operator*() const noexcept | |
| 143 | { | ||
| 144 | 4574475 | value_type v = *it_; | |
| 145 | using P = std::conditional_t< | ||
| 146 | mutable_buffer_sequence<BufferSequence>, | ||
| 147 | char*, char const*>; | ||
| 148 | 4574475 | auto p = reinterpret_cast<P>(v.data()); | |
| 149 | 4574475 | auto n = v.size(); | |
| 150 |
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4574475 | if(i_ == 0) |
| 151 | { | ||
| 152 | 2968228 | p += prefix_; | |
| 153 | 2968228 | n -= prefix_; | |
| 154 | } | ||
| 155 |
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4574475 | if(i_ == n_ - 1) |
| 156 | 2968228 | n -= suffix_; | |
| 157 | 4574475 | return value_type(p, n); | |
| 158 | } | ||
| 159 | |||
| 160 | const_iterator& | ||
| 161 | 3013267 | operator++() noexcept | |
| 162 | { | ||
| 163 |
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3013267 | BOOST_ASSERT(i_ < n_); |
| 164 | 3013267 | ++it_; | |
| 165 | 3013267 | ++i_; | |
| 166 | 3013267 | return *this; | |
| 167 | } | ||
| 168 | |||
| 169 | const_iterator | ||
| 170 | 780604 | operator++(int) noexcept | |
| 171 | { | ||
| 172 | 780604 | auto temp = *this; | |
| 173 | 780604 | ++(*this); | |
| 174 | 780604 | return temp; | |
| 175 | } | ||
| 176 | |||
| 177 | const_iterator& | ||
| 178 | 1561208 | operator--() noexcept | |
| 179 | { | ||
| 180 |
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1561208 | BOOST_ASSERT(i_ > 0); |
| 181 | 1561208 | --it_; | |
| 182 | 1561208 | --i_; | |
| 183 | 1561208 | return *this; | |
| 184 | } | ||
| 185 | |||
| 186 | const_iterator | ||
| 187 | 780604 | operator--(int) noexcept | |
| 188 | { | ||
| 189 | 780604 | auto temp = *this; | |
| 190 | 780604 | --(*this); | |
| 191 | 780604 | return temp; | |
| 192 | } | ||
| 193 | }; | ||
| 194 | |||
| 195 | /** Constructor | ||
| 196 | */ | ||
| 197 | slice_of() = default; | ||
| 198 | |||
| 199 | /** Constructor | ||
| 200 | */ | ||
| 201 | 278808 | slice_of( | |
| 202 | BufferSequence const& bs) | ||
| 203 | 278808 | : bs_(bs) | |
| 204 | { | ||
| 205 | 278808 | iter_type it = capy::begin(bs_); | |
| 206 | 278808 | iter_type eit = capy::end(bs_); | |
| 207 | 278808 | begin_ = 0; | |
| 208 | 278808 | end_ = std::distance(it, eit); | |
| 209 |
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836976 | while(it != eit) |
| 210 | { | ||
| 211 | 558168 | value_type b(*it); | |
| 212 | 558168 | size_ += b.size(); | |
| 213 | 558168 | ++len_; | |
| 214 | 558168 | ++it; | |
| 215 | } | ||
| 216 | 278808 | } | |
| 217 | |||
| 218 | /** Return an iterator to the beginning of the sequence | ||
| 219 | */ | ||
| 220 | const_iterator | ||
| 221 | 3207394 | begin() const noexcept | |
| 222 | { | ||
| 223 | return const_iterator( | ||
| 224 | 3207394 | begin_iter_impl(), prefix_, suffix_, 0, len_); | |
| 225 | } | ||
| 226 | |||
| 227 | /** Return an iterator to the end of the sequence | ||
| 228 | */ | ||
| 229 | const_iterator | ||
| 230 | 3207394 | end() const noexcept | |
| 231 | { | ||
| 232 | return const_iterator( | ||
| 233 | 3207394 | end_iter_impl(), prefix_, suffix_, len_, len_); | |
| 234 | } | ||
| 235 | |||
| 236 | friend | ||
| 237 | void | ||
| 238 | 266991 | tag_invoke( | |
| 239 | slice_tag const&, | ||
| 240 | slice_of<BufferSequence>& bs, | ||
| 241 | slice_how how, | ||
| 242 | std::size_t n) | ||
| 243 | { | ||
| 244 | 266991 | bs.slice_impl(how, n); | |
| 245 | 266991 | } | |
| 246 | |||
| 247 | private: | ||
| 248 | iter_type | ||
| 249 | 3453823 | begin_iter_impl() const noexcept | |
| 250 | { | ||
| 251 | 3453823 | iter_type it = capy::begin(bs_); | |
| 252 | 3453823 | std::advance(it, begin_); | |
| 253 | 3453823 | return it; | |
| 254 | } | ||
| 255 | |||
| 256 | iter_type | ||
| 257 | 3322375 | end_iter_impl() const noexcept | |
| 258 | { | ||
| 259 | 3322375 | iter_type it = capy::begin(bs_); | |
| 260 | 3322375 | std::advance(it, end_); | |
| 261 | 3322375 | return it; | |
| 262 | } | ||
| 263 | |||
| 264 | void | ||
| 265 | 131448 | remove_prefix_impl( | |
| 266 | std::size_t n) | ||
| 267 | { | ||
| 268 |
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131448 | if(n > size_) |
| 269 | 4123 | n = size_; | |
| 270 | |||
| 271 | // nice hack to simplify the loop (M. Nejati) | ||
| 272 | 131448 | n += prefix_; | |
| 273 | 131448 | size_ += prefix_; | |
| 274 | 131448 | prefix_ = 0; | |
| 275 | |||
| 276 | 131448 | iter_type it = begin_iter_impl(); | |
| 277 | |||
| 278 |
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200589 | while(n > 0 && begin_ != end_) |
| 279 | { | ||
| 280 | 177826 | value_type b = *it; | |
| 281 |
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177826 | if(n < b.size()) |
| 282 | { | ||
| 283 | 108685 | prefix_ = n; | |
| 284 | 108685 | size_ -= n; | |
| 285 | 108685 | break; | |
| 286 | } | ||
| 287 | 69141 | n -= b.size(); | |
| 288 | 69141 | size_ -= b.size(); | |
| 289 | 69141 | ++begin_; | |
| 290 | 69141 | ++it; | |
| 291 | 69141 | --len_; | |
| 292 | } | ||
| 293 | 131448 | } | |
| 294 | |||
| 295 | void | ||
| 296 | 114981 | remove_suffix_impl( | |
| 297 | std::size_t n) | ||
| 298 | { | ||
| 299 |
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114981 | if(size_ == 0) |
| 300 | { | ||
| 301 | ✗ | BOOST_ASSERT(begin_ == end_); | |
| 302 | 114981 | return; | |
| 303 | } | ||
| 304 |
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114981 | BOOST_ASSERT(begin_ != end_); |
| 305 | |||
| 306 |
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114981 | if(n > size_) |
| 307 | ✗ | n = size_; | |
| 308 | |||
| 309 | 114981 | n += suffix_; | |
| 310 | 114981 | size_ += suffix_; | |
| 311 | 114981 | suffix_ = 0; | |
| 312 | |||
| 313 | 114981 | iter_type bit = begin_iter_impl(); | |
| 314 | 114981 | iter_type it = end_iter_impl(); | |
| 315 | 114981 | it--; | |
| 316 | |||
| 317 |
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189200 | while(it != bit) |
| 318 | { | ||
| 319 | 115144 | value_type b = *it; | |
| 320 |
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115144 | if(n < b.size()) |
| 321 | { | ||
| 322 | 40925 | suffix_ = n; | |
| 323 | 40925 | size_ -= n; | |
| 324 | 40925 | return; | |
| 325 | } | ||
| 326 | 74219 | n -= b.size(); | |
| 327 | 74219 | size_ -= b.size(); | |
| 328 | 74219 | --it; | |
| 329 | 74219 | --end_; | |
| 330 | 74219 | --len_; | |
| 331 | } | ||
| 332 | 74056 | value_type b = *it; | |
| 333 | 74056 | auto m = b.size() - prefix_; | |
| 334 |
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74056 | if(n < m) |
| 335 | { | ||
| 336 | 74056 | suffix_ = n; | |
| 337 | 74056 | size_ -= n; | |
| 338 | 74056 | return; | |
| 339 | } | ||
| 340 | ✗ | end_ = begin_; | |
| 341 | ✗ | len_ = 0; | |
| 342 | ✗ | size_ = 0; | |
| 343 | } | ||
| 344 | |||
| 345 | void | ||
| 346 | 135543 | keep_prefix_impl( | |
| 347 | std::size_t n) | ||
| 348 | { | ||
| 349 |
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135543 | if(n >= size_) |
| 350 | 8219 | return; | |
| 351 |
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127324 | if(n == 0) |
| 352 | { | ||
| 353 | 12343 | end_ = begin_; | |
| 354 | 12343 | len_ = 0; | |
| 355 | 12343 | size_ = 0; | |
| 356 | 12343 | return; | |
| 357 | } | ||
| 358 | 114981 | remove_suffix_impl(size_ - n); | |
| 359 | } | ||
| 360 | |||
| 361 | void | ||
| 362 | keep_suffix_impl( | ||
| 363 | std::size_t n) | ||
| 364 | { | ||
| 365 | if(n >= size_) | ||
| 366 | return; | ||
| 367 | if(n == 0) | ||
| 368 | { | ||
| 369 | begin_ = end_; | ||
| 370 | len_ = 0; | ||
| 371 | size_ = 0; | ||
| 372 | return; | ||
| 373 | } | ||
| 374 | remove_prefix_impl(size_ - n); | ||
| 375 | } | ||
| 376 | |||
| 377 | void | ||
| 378 | 266991 | slice_impl( | |
| 379 | slice_how how, | ||
| 380 | std::size_t n) | ||
| 381 | { | ||
| 382 |
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266991 | switch(how) |
| 383 | { | ||
| 384 | 131448 | case slice_how::remove_prefix: | |
| 385 | { | ||
| 386 | 131448 | remove_prefix_impl(n); | |
| 387 | 131448 | break; | |
| 388 | } | ||
| 389 | 135543 | case slice_how::keep_prefix: | |
| 390 | { | ||
| 391 | 135543 | keep_prefix_impl(n); | |
| 392 | 135543 | break; | |
| 393 | } | ||
| 394 | } | ||
| 395 | 266991 | } | |
| 396 | }; | ||
| 397 | |||
| 398 | //------------------------------------------------ | ||
| 399 | |||
| 400 | // in-place modify return value | ||
| 401 | // ----------------------------- | ||
| 402 | // keep_prefix* prefix | ||
| 403 | // keep_suffix suffix | ||
| 404 | // remove_prefix* sans_prefix | ||
| 405 | // remove_suffix sans_suffix | ||
| 406 | |||
| 407 | /** Remove all but the first `n` bytes from a buffer sequence | ||
| 408 | */ | ||
| 409 | constexpr struct keep_prefix_mrdocs_workaround_t | ||
| 410 | { | ||
| 411 | template<const_buffer_sequence BufferSequence> | ||
| 412 | requires detail::has_tag_invoke<BufferSequence>::value | ||
| 413 | 412994 | void operator()( | |
| 414 | BufferSequence& bs, | ||
| 415 | std::size_t n) const | ||
| 416 | { | ||
| 417 |
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412994 | tag_invoke(slice_tag{}, bs, slice_how::keep_prefix, n); |
| 418 | 412994 | } | |
| 419 | } const keep_prefix{}; | ||
| 420 | |||
| 421 | /** Remove all but the last `n` bytes from a buffer sequence | ||
| 422 | */ | ||
| 423 | constexpr struct keep_suffix_mrdocs_workaround_t | ||
| 424 | { | ||
| 425 | template<const_buffer_sequence BufferSequence> | ||
| 426 | requires detail::has_tag_invoke<BufferSequence>::value | ||
| 427 | 140418 | void operator()( | |
| 428 | BufferSequence& bs, | ||
| 429 | std::size_t n) const | ||
| 430 | { | ||
| 431 | 140418 | auto n0 = buffer_size(bs); | |
| 432 |
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140418 | if(n < n0) |
| 433 |
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123896 | tag_invoke(slice_tag{}, bs, slice_how::remove_prefix, n0 - n); |
| 434 | 140418 | } | |
| 435 | } const keep_suffix{}; | ||
| 436 | |||
| 437 | /** Remove `n` bytes from the beginning of a buffer sequence | ||
| 438 | */ | ||
| 439 | constexpr struct remove_prefix_mrdocs_workaround_t | ||
| 440 | { | ||
| 441 | template<const_buffer_sequence BufferSequence> | ||
| 442 | requires detail::has_tag_invoke<BufferSequence>::value | ||
| 443 | 404933 | void operator()( | |
| 444 | BufferSequence& bs, | ||
| 445 | std::size_t n) const | ||
| 446 | { | ||
| 447 |
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404933 | tag_invoke(slice_tag{}, bs, slice_how::remove_prefix, n); |
| 448 | 404933 | } | |
| 449 | } const remove_prefix{}; | ||
| 450 | |||
| 451 | /** Remove `n` bytes from the end of a buffer sequence | ||
| 452 | */ | ||
| 453 | constexpr struct remove_suffix_mrdocs_workaround_t | ||
| 454 | { | ||
| 455 | template<const_buffer_sequence BufferSequence> | ||
| 456 | requires detail::has_tag_invoke<BufferSequence>::value | ||
| 457 | 140672 | void operator()( | |
| 458 | BufferSequence& bs, | ||
| 459 | std::size_t n) const | ||
| 460 | { | ||
| 461 | 140672 | auto n0 = buffer_size(bs); | |
| 462 |
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140672 | if(n > 0) |
| 463 | { | ||
| 464 |
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132389 | if( n > n0) |
| 465 | 8283 | n = n0; | |
| 466 |
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132389 | tag_invoke(slice_tag{}, bs, slice_how::keep_prefix, n0 - n); |
| 467 | } | ||
| 468 | 140672 | } | |
| 469 | } const remove_suffix{}; | ||
| 470 | |||
| 471 | //------------------------------------------------ | ||
| 472 | |||
| 473 | /** Return a sequence representing the first `n` bytes of a buffer sequence | ||
| 474 | */ | ||
| 475 | constexpr struct prefix_mrdocs_workaround_t | ||
| 476 | { | ||
| 477 | template<const_buffer_sequence BufferSequence> | ||
| 478 | 108 | slice_type<BufferSequence> operator()( | |
| 479 | BufferSequence const& bs, | ||
| 480 | std::size_t n) const noexcept | ||
| 481 | { | ||
| 482 | 108 | slice_type<BufferSequence> result(bs); | |
| 483 | 108 | keep_prefix(result, n); | |
| 484 | 108 | return result; | |
| 485 | } | ||
| 486 | } prefix{}; | ||
| 487 | |||
| 488 | /** Return a sequence representing the last `n` bytes of a buffer sequence | ||
| 489 | */ | ||
| 490 | constexpr struct suffix_mrdocs_workaround_t | ||
| 491 | { | ||
| 492 | template<const_buffer_sequence BufferSequence> | ||
| 493 | slice_type<BufferSequence> operator()( | ||
| 494 | BufferSequence const& bs, | ||
| 495 | std::size_t n) const noexcept | ||
| 496 | { | ||
| 497 | slice_type<BufferSequence> result(bs); | ||
| 498 | keep_suffix(result, n); | ||
| 499 | return result; | ||
| 500 | } | ||
| 501 | } suffix{}; | ||
| 502 | |||
| 503 | /** Return a sequence representing all but the first `n` bytes of a buffer sequence | ||
| 504 | */ | ||
| 505 | constexpr struct sans_prefix_mrdocs_workaround_t | ||
| 506 | { | ||
| 507 | template<const_buffer_sequence BufferSequence> | ||
| 508 | 69 | slice_type<BufferSequence> operator()( | |
| 509 | BufferSequence const& bs, | ||
| 510 | std::size_t n) const noexcept | ||
| 511 | { | ||
| 512 | 69 | slice_type<BufferSequence> result(bs); | |
| 513 | 69 | remove_prefix(result, n); | |
| 514 | 69 | return result; | |
| 515 | } | ||
| 516 | } sans_prefix{}; | ||
| 517 | |||
| 518 | /** Return a sequence representing all but the last `n` bytes of a buffer sequence | ||
| 519 | */ | ||
| 520 | constexpr struct sans_suffix_mrdocs_workaround_t | ||
| 521 | { | ||
| 522 | template<const_buffer_sequence BufferSequence> | ||
| 523 | slice_type<BufferSequence> operator()( | ||
| 524 | BufferSequence const& bs, | ||
| 525 | std::size_t n) const noexcept | ||
| 526 | { | ||
| 527 | slice_type<BufferSequence> result(bs); | ||
| 528 | remove_suffix(result, n); | ||
| 529 | return result; | ||
| 530 | } | ||
| 531 | } sans_suffix{}; | ||
| 532 | |||
| 533 | } // capy | ||
| 534 | } // boost | ||
| 535 | |||
| 536 | #endif | ||
| 537 |