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|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2023 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_COPY_HPP | ||
| 11 | #define BOOST_CAPY_BUFFERS_COPY_HPP | ||
| 12 | |||
| 13 | #include <boost/capy/detail/config.hpp> | ||
| 14 | #include <boost/capy/buffers.hpp> | ||
| 15 | #include <cstring> | ||
| 16 | #include <utility> | ||
| 17 | |||
| 18 | namespace boost { | ||
| 19 | namespace capy { | ||
| 20 | |||
| 21 | /** Copy the contents of a buffer sequence into another buffer sequence | ||
| 22 | |||
| 23 | This function copies no more than `at_most` bytes from the constant buffer | ||
| 24 | sequence denoted by `src` into the mutable buffer sequence denoted by `dest`. | ||
| 25 | |||
| 26 | @par Constraints | ||
| 27 | @code | ||
| 28 | MutableBufferSequence<decltype(dest)> && | ||
| 29 | ConstBufferSequence<decltype(src)> | ||
| 30 | @endcode | ||
| 31 | |||
| 32 | @return The number of bytes actually copied, which will be exactly equal to | ||
| 33 | `std::min( size(dest), size(src), at_most )`. | ||
| 34 | |||
| 35 | @param dest The destination buffer sequence | ||
| 36 | |||
| 37 | @param src The source buffer sequence | ||
| 38 | */ | ||
| 39 | constexpr struct copy_mrdocs_workaround_t | ||
| 40 | { | ||
| 41 | template< | ||
| 42 | MutableBufferSequence MutableBufferSequence, | ||
| 43 | ConstBufferSequence ConstBufferSequence> | ||
| 44 | std::size_t | ||
| 45 | 305039 | operator()( | |
| 46 | MutableBufferSequence const& dest, | ||
| 47 | ConstBufferSequence const& src, | ||
| 48 | std::size_t at_most = std::size_t(-1)) const noexcept | ||
| 49 | { | ||
| 50 | 305039 | std::size_t total = 0; | |
| 51 | 305039 | std::size_t pos0 = 0; | |
| 52 | 305039 | std::size_t pos1 = 0; | |
| 53 | 305039 | auto const end0 = end(src); | |
| 54 | 305039 | auto const end1 = end(dest); | |
| 55 | 305039 | auto it0 = begin(src); | |
| 56 | 305039 | auto it1 = begin(dest); | |
| 57 | 305039 | while( | |
| 58 |
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904767 | total < at_most && |
| 59 |
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1521959 | it0 != end0 && |
| 60 | it1 != end1) | ||
| 61 | { | ||
| 62 | 606190 | const_buffer b0 = *it0; | |
| 63 | 606190 | mutable_buffer b1 = *it1; | |
| 64 | 606190 | b0 += pos0; | |
| 65 | 606190 | b1 += pos1; | |
| 66 | std::size_t const amount = | ||
| 67 | 1818570 | [&] | |
| 68 | { | ||
| 69 | 606190 | std::size_t n = b0.size(); | |
| 70 |
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606190 | if( n > b1.size()) |
| 71 | 14180 | n = b1.size(); | |
| 72 |
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606190 | if( n > at_most - total) |
| 73 | 4878 | n = at_most - total; | |
| 74 |
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606190 | if(n != 0) |
| 75 | 394309 | std::memcpy( | |
| 76 | b1.data(), | ||
| 77 | b0.data(), | ||
| 78 | n); | ||
| 79 | 606190 | return n; | |
| 80 | 606190 | }(); | |
| 81 | 606190 | total += amount; | |
| 82 |
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606190 | if(amount == b1.size()) |
| 83 | { | ||
| 84 | 18266 | ++it1; | |
| 85 | 18266 | pos1 = 0; | |
| 86 | } | ||
| 87 | else | ||
| 88 | { | ||
| 89 | 587924 | pos1 += amount; | |
| 90 | } | ||
| 91 |
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606190 | if(amount == b0.size()) |
| 92 | { | ||
| 93 | 588548 | ++it0; | |
| 94 | 588548 | pos0 = 0; | |
| 95 | } | ||
| 96 | else | ||
| 97 | { | ||
| 98 | 17642 | pos0 += amount; | |
| 99 | } | ||
| 100 | } | ||
| 101 | 305039 | return total; | |
| 102 | } | ||
| 103 | } copy {}; | ||
| 104 | |||
| 105 | } // capy | ||
| 106 | } // boost | ||
| 107 | |||
| 108 | #endif | ||
| 109 |