src/detail/circular_buffer.cpp
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boost::http::detail::circular_buffer::data() const
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boost::http::detail::circular_buffer::prepare(unsigned long)
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boost::http::detail::circular_buffer::commit(unsigned long)
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boost::http::detail::circular_buffer::consume(unsigned long)
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| Line | TLA | Hits | Source Code |
|---|---|---|---|
| 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/http | ||
| 8 | // | ||
| 9 | |||
| 10 | #include <boost/http/detail/circular_buffer.hpp> | ||
| 11 | #include <boost/http/detail/except.hpp> | ||
| 12 | |||
| 13 | namespace boost { | ||
| 14 | namespace http { | ||
| 15 | namespace detail { | ||
| 16 | |||
| 17 | auto | ||
| 18 | 169700x | circular_buffer:: | |
| 19 | data() const noexcept -> | ||
| 20 | const_buffers_type | ||
| 21 | { | ||
| 22 | 169700x | if(in_pos_ + in_len_ <= cap_) | |
| 23 | return {{ | ||
| 24 | 153419x | capy::const_buffer{ base_ + in_pos_, in_len_ }, | |
| 25 | 153419x | capy::const_buffer{ base_, 0} }}; | |
| 26 | return {{ | ||
| 27 | 16281x | capy::const_buffer{ base_ + in_pos_, cap_ - in_pos_}, | |
| 28 | 16281x | capy::const_buffer{ base_, in_len_- (cap_ - in_pos_)} }}; | |
| 29 | } | ||
| 30 | |||
| 31 | auto | ||
| 32 | 90154x | circular_buffer:: | |
| 33 | prepare(std::size_t n) -> | ||
| 34 | mutable_buffers_type | ||
| 35 | { | ||
| 36 | // Buffer is too small for n | ||
| 37 | 90154x | if(n > cap_ - in_len_) | |
| 38 | ✗ | detail::throw_length_error(); | |
| 39 | |||
| 40 | 90154x | out_size_ = n; | |
| 41 | 90154x | auto const pos = ( | |
| 42 | 90154x | in_pos_ + in_len_) % cap_; | |
| 43 | 90154x | if(pos + n <= cap_) | |
| 44 | return {{ | ||
| 45 | 54078x | capy::mutable_buffer{ base_ + pos, n }, | |
| 46 | 54078x | capy::mutable_buffer{ base_, 0 } }}; | |
| 47 | return {{ | ||
| 48 | 36076x | capy::mutable_buffer{ base_ + pos, cap_ - pos }, | |
| 49 | 36076x | capy::mutable_buffer{ base_, n - (cap_ - pos) } }}; | |
| 50 | } | ||
| 51 | |||
| 52 | void | ||
| 53 | 89826x | circular_buffer:: | |
| 54 | commit( | ||
| 55 | std::size_t n) noexcept | ||
| 56 | { | ||
| 57 | 89826x | if(n < out_size_) | |
| 58 | 89549x | in_len_ += n; | |
| 59 | else | ||
| 60 | 277x | in_len_ += out_size_; | |
| 61 | 89826x | out_size_ = 0; | |
| 62 | 89826x | } | |
| 63 | |||
| 64 | void | ||
| 65 | 143923x | circular_buffer:: | |
| 66 | consume( | ||
| 67 | std::size_t n) noexcept | ||
| 68 | { | ||
| 69 | 143923x | if(n < in_len_) | |
| 70 | { | ||
| 71 | 115209x | in_pos_ = (in_pos_ + n) % cap_; | |
| 72 | 115209x | in_len_ -= n; | |
| 73 | } | ||
| 74 | else | ||
| 75 | { | ||
| 76 | // preserve in_pos_ if there is | ||
| 77 | // a prepared buffer | ||
| 78 | 28714x | if(out_size_ != 0) | |
| 79 | { | ||
| 80 | 1x | in_pos_ = (in_pos_ + in_len_) % cap_; | |
| 81 | 1x | in_len_ = 0; | |
| 82 | } | ||
| 83 | else | ||
| 84 | { | ||
| 85 | // make prepare return a | ||
| 86 | // bigger single buffer | ||
| 87 | 28713x | in_pos_ = 0; | |
| 88 | 28713x | in_len_ = 0; | |
| 89 | } | ||
| 90 | } | ||
| 91 | 143923x | } | |
| 92 | |||
| 93 | } // detail | ||
| 94 | } // http | ||
| 95 | } // boost | ||
| 96 |