libs/capy/include/boost/capy/buffers/buffer_copy.hpp

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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_BUFFER_COPY_HPP
11			#define BOOST_CAPY_BUFFERS_BUFFER_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 bytes from the constant buffer sequence `src` into
24			the mutable buffer sequence `dest`, stopping when any limit is reached.
25
26			@par Constraints
27			@code
28			MutableBufferSequence<decltype(dest)> &&
29			ConstBufferSequence<decltype(src)>
30			@endcode
31
32			@return The number of bytes copied, equal to
33			`std::min(size(dest), size(src), at_most)`.
34
35			@param dest The destination buffer sequence.
36			@param src The source buffer sequence.
37			@param at_most The maximum bytes to copy. Default copies all available.
38			*/
39			constexpr struct buffer_copy_mrdocs_workaround_t
40			{
41			template<
42			MutableBufferSequence MB,
43			ConstBufferSequence CB>
44			std::size_t
45		14686	operator()(
46			MB const& dest,
47			CB const& src,
48			std::size_t at_most = std::size_t(-1)) const noexcept
49			{
50		14686	std::size_t total = 0;
51		14686	std::size_t pos0 = 0;
52		14686	std::size_t pos1 = 0;
53		14686	auto const end0 = end(src);
54		14686	auto const end1 = end(dest);
55		14686	auto it0 = begin(src);
56		14686	auto it1 = begin(dest);
57		14686	while(
58	2/2 ✓ Branch 0 taken 1941 times. ✓ Branch 1 taken 897 times.	45752	total < at_most &&
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60	2/2 ✓ Branch 1 taken 595 times. ✓ Branch 2 taken 230 times.	9310	it1 != end1)
61			{
62		24865	const_buffer b0 = *it0;
63		24865	mutable_buffer b1 = *it1;
64		24865	b0 += pos0;
65		24865	b1 += pos1;
66			std::size_t const amount =
67		74595	[&]
68			{
69		24865	std::size_t n = b0.size();
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71		5606	n = b1.size();
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73		4878	n = at_most - total;
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75		22507	std::memcpy(
76			b1.data(),
77			b0.data(),
78			n);
79		24865	return n;
80		24865	}();
81		24865	total += amount;
82	2/2 ✓ Branch 1 taken 869 times. ✓ Branch 2 taken 1275 times.	24865	if(amount == b1.size())
83			{
84		6879	++it1;
85		6879	pos1 = 0;
86			}
87			else
88			{
89		17986	pos1 += amount;
90			}
91	2/2 ✓ Branch 1 taken 1646 times. ✓ Branch 2 taken 498 times.	24865	if(amount == b0.size())
92			{
93		15797	++it0;
94		15797	pos0 = 0;
95			}
96			else
97			{
98		9068	pos0 += amount;
99			}
100			}
101		14686	return total;
102			}
103			} buffer_copy {};
104
105			} // capy
106			} // boost
107
108			#endif
109