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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/buffers | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_BUFFERS_BUFFER_COPY_HPP | ||
| 11 | #define BOOST_BUFFERS_BUFFER_COPY_HPP | ||
| 12 | |||
| 13 | #include <boost/buffers/detail/config.hpp> | ||
| 14 | #include <boost/buffers/range.hpp> | ||
| 15 | #include <boost/buffers/type_traits.hpp> | ||
| 16 | #include <boost/assert.hpp> | ||
| 17 | #include <cstring> | ||
| 18 | #include <utility> | ||
| 19 | |||
| 20 | namespace boost { | ||
| 21 | namespace buffers { | ||
| 22 | namespace detail { | ||
| 23 | |||
| 24 | struct buffer_copy_impl | ||
| 25 | { | ||
| 26 | template< | ||
| 27 | class MutableBuffers, | ||
| 28 | class ConstBuffers> | ||
| 29 | std::size_t | ||
| 30 | 601351 | operator()( | |
| 31 | MutableBuffers const& to, | ||
| 32 | ConstBuffers const& from, | ||
| 33 | std::size_t at_most = | ||
| 34 | std::size_t(-1)) const noexcept | ||
| 35 | { | ||
| 36 | // If you get a compile error here it | ||
| 37 | // means that one or both of your types | ||
| 38 | // do not meet the requirements. | ||
| 39 | static_assert( | ||
| 40 | is_mutable_buffer_sequence< | ||
| 41 | MutableBuffers>::value, | ||
| 42 | "Type requirements not met"); | ||
| 43 | static_assert( | ||
| 44 | is_const_buffer_sequence< | ||
| 45 | ConstBuffers>::value, | ||
| 46 | "Type requirements not met"); | ||
| 47 | |||
| 48 | 601351 | std::size_t total = 0; | |
| 49 | 601351 | std::size_t pos0 = 0; | |
| 50 | 601351 | std::size_t pos1 = 0; | |
| 51 | 601351 | auto const end0 = end(from); | |
| 52 | 601351 | auto const end1 = end(to); | |
| 53 | 601351 | auto it0 = begin(from); | |
| 54 | 601351 | auto it1 = begin(to); | |
| 55 | 601351 | while( | |
| 56 |
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1421704 | total < at_most && |
| 57 |
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2723364 | it0 != end0 && |
| 58 | it1 != end1) | ||
| 59 | { | ||
| 60 | const_buffer b0 = | ||
| 61 | 826815 | const_buffer(*it0) + pos0; | |
| 62 | mutable_buffer b1 = | ||
| 63 | 826815 | mutable_buffer(*it1) + pos1; | |
| 64 | std::size_t const amount = | ||
| 65 | 4114737 | [&] | |
| 66 | { | ||
| 67 | 826815 | std::size_t n = b0.size(); | |
| 68 |
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826815 | if( n > b1.size()) |
| 69 | 23316 | n = b1.size(); | |
| 70 |
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826815 | if( n > at_most - total) |
| 71 | 4878 | n = at_most - total; | |
| 72 |
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826815 | if(n != 0) |
| 73 | 803049 | std::memcpy( | |
| 74 | b1.data(), | ||
| 75 | b0.data(), | ||
| 76 | n); | ||
| 77 | 826815 | return n; | |
| 78 | 826815 | }(); | |
| 79 | 826815 | total += amount; | |
| 80 |
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826815 | if(amount == b1.size()) |
| 81 | { | ||
| 82 | 592314 | ++it1; | |
| 83 | 592314 | pos1 = 0; | |
| 84 | } | ||
| 85 | else | ||
| 86 | { | ||
| 87 | 234501 | pos1 += amount; | |
| 88 | } | ||
| 89 |
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826815 | if(amount == b0.size()) |
| 90 | { | ||
| 91 | 800037 | ++it0; | |
| 92 | 800037 | pos0 = 0; | |
| 93 | } | ||
| 94 | else | ||
| 95 | { | ||
| 96 | 26778 | pos0 += amount; | |
| 97 | } | ||
| 98 | } | ||
| 99 | 601351 | return total; | |
| 100 | } | ||
| 101 | }; | ||
| 102 | |||
| 103 | } // detail | ||
| 104 | |||
| 105 | /** Copy buffer contents | ||
| 106 | */ | ||
| 107 | constexpr detail::buffer_copy_impl buffer_copy{}; | ||
| 108 | |||
| 109 | } // buffers | ||
| 110 | } // boost | ||
| 111 | |||
| 112 | #endif | ||
| 113 |