| Line | Branch | Exec | Source |
|---|---|---|---|
| 1 | // | ||
| 2 | // Copyright (c) 2019 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_proto | ||
| 8 | // | ||
| 9 | |||
| 10 | #ifndef BOOST_HTTP_PROTO_DETAIL_IMPL_CIRCULAR_BUFFER_IPP | ||
| 11 | #define BOOST_HTTP_PROTO_DETAIL_IMPL_CIRCULAR_BUFFER_IPP | ||
| 12 | |||
| 13 | #include <boost/http_proto/detail/circular_buffer.hpp> | ||
| 14 | #include <boost/http_proto/detail/except.hpp> | ||
| 15 | #include <boost/assert.hpp> | ||
| 16 | |||
| 17 | namespace boost { | ||
| 18 | namespace http_proto { | ||
| 19 | namespace detail { | ||
| 20 | |||
| 21 | 6 | circular_buffer:: | |
| 22 | circular_buffer( | ||
| 23 | void* base, | ||
| 24 | 6 | std::size_t capacity) noexcept | |
| 25 | : base_(reinterpret_cast< | ||
| 26 | unsigned char*>(base)) | ||
| 27 | 6 | , cap_(capacity) | |
| 28 | { | ||
| 29 | 6 | } | |
| 30 | |||
| 31 | bool | ||
| 32 | 4 | circular_buffer:: | |
| 33 | empty() const noexcept | ||
| 34 | { | ||
| 35 | 4 | return in_len_ == 0; | |
| 36 | } | ||
| 37 | |||
| 38 | std::size_t | ||
| 39 | 5 | circular_buffer:: | |
| 40 | size() const noexcept | ||
| 41 | { | ||
| 42 | 5 | return in_len_; | |
| 43 | } | ||
| 44 | |||
| 45 | std::size_t | ||
| 46 | 11 | circular_buffer:: | |
| 47 | capacity() const noexcept | ||
| 48 | { | ||
| 49 | 11 | return cap_; | |
| 50 | } | ||
| 51 | |||
| 52 | auto | ||
| 53 | 4 | circular_buffer:: | |
| 54 | data() const noexcept -> | ||
| 55 | const_buffers_pair | ||
| 56 | { | ||
| 57 |
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4 | if(in_pos_ + in_len_ <= cap_) |
| 58 | return { | ||
| 59 | const_buffer{ | ||
| 60 | 4 | base_ + in_pos_, in_len_ }, | |
| 61 | 4 | const_buffer{ base_, 0} }; | |
| 62 | return { | ||
| 63 | const_buffer{ | ||
| 64 | ✗ | base_ + in_pos_, cap_ - in_pos_}, | |
| 65 | const_buffer{ | ||
| 66 | ✗ | base_, in_len_- (cap_ - in_pos_)}}; | |
| 67 | } | ||
| 68 | |||
| 69 | auto | ||
| 70 | 7 | circular_buffer:: | |
| 71 | prepare(std::size_t n) -> | ||
| 72 | mutable_buffers_pair | ||
| 73 | { | ||
| 74 | // Buffer is too small for n | ||
| 75 |
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7 | if(n > cap_ - in_len_) |
| 76 | ✗ | detail::throw_length_error(); | |
| 77 | |||
| 78 | 7 | out_size_ = n; | |
| 79 | 7 | auto const pos = ( | |
| 80 | 7 | in_pos_ + in_len_) % cap_; | |
| 81 |
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7 | if(pos + n <= cap_) |
| 82 | return { | ||
| 83 | mutable_buffer{ | ||
| 84 | 7 | base_ + pos, n}, | |
| 85 | 7 | mutable_buffer{base_, 0}}; | |
| 86 | return { | ||
| 87 | mutable_buffer{ | ||
| 88 | ✗ | base_ + pos, cap_ - pos}, | |
| 89 | mutable_buffer{ | ||
| 90 | ✗ | base_, n - (cap_ - pos)}}; | |
| 91 | } | ||
| 92 | |||
| 93 | void | ||
| 94 | 7 | circular_buffer:: | |
| 95 | commit(std::size_t n) | ||
| 96 | { | ||
| 97 | // Precondition violation | ||
| 98 |
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7 | if(n > out_size_) |
| 99 | ✗ | detail::throw_length_error(); | |
| 100 | |||
| 101 | 7 | in_len_ += n; | |
| 102 | 7 | out_size_ = 0; | |
| 103 | 7 | } | |
| 104 | |||
| 105 | void | ||
| 106 | ✗ | circular_buffer:: | |
| 107 | uncommit( | ||
| 108 | std::size_t n) | ||
| 109 | { | ||
| 110 | // Precondition violation | ||
| 111 | ✗ | if( n > in_len_ || | |
| 112 | ✗ | out_size_ > 0) | |
| 113 | ✗ | detail::throw_length_error(); | |
| 114 | |||
| 115 | ✗ | in_len_ -= n; | |
| 116 | } | ||
| 117 | |||
| 118 | void | ||
| 119 | 4 | circular_buffer:: | |
| 120 | consume(std::size_t n) noexcept | ||
| 121 | { | ||
| 122 |
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4 | if(n < in_len_) |
| 123 | { | ||
| 124 | ✗ | in_pos_ = (in_pos_ + n) % cap_; | |
| 125 | ✗ | in_len_ -= n; | |
| 126 | } | ||
| 127 | else | ||
| 128 | { | ||
| 129 | // make prepare return a | ||
| 130 | // bigger single buffer | ||
| 131 | 4 | in_pos_ = 0; | |
| 132 | 4 | in_len_ = 0; | |
| 133 | } | ||
| 134 | 4 | } | |
| 135 | |||
| 136 | } // detail | ||
| 137 | } // http_proto | ||
| 138 | } // boost | ||
| 139 | |||
| 140 | #endif | ||
| 141 |