GCC Code Coverage Report

Directory: ./
File: libs/buffers/include/boost/buffers/string_buffer.hpp
Date: 2025-12-06 02:12:43
Exec Total Coverage
Lines: 51 51 100.0%
Functions: 10 10 100.0%
Branches: 17 17 100.0%
Line Branch Exec Source
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_STRING_BUFFER_HPP
11 #define BOOST_BUFFERS_STRING_BUFFER_HPP
12
13 #include <boost/buffers/buffer.hpp>
14 #include <boost/buffers/detail/except.hpp>
15 #include <boost/assert.hpp>
16 #include <string>
17
18 namespace boost {
19 namespace buffers {
20
21 /** A dynamic buffer using an underlying string
22 */
23 template<
24 class CharT,
25 class Traits = std::char_traits<CharT>,
26 class Allocator = std::allocator<CharT>>
27 class basic_string_buffer
28 {
29 std::basic_string<
30 CharT, Traits, Allocator>* s_;
31 std::size_t max_size_;
32
33 public:
34 using string_type = std::basic_string<
35 CharT, Traits, Allocator>;
36
37 unsigned char* data_ = nullptr;
38 std::size_t in_size_ = 0;
39 std::size_t out_size_ = 0;
40
41 public:
42 using const_buffers_type = const_buffer;
43 using mutable_buffers_type = mutable_buffer;
44
45 15 ~basic_string_buffer()
46 {
47
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 15 if(s_)
48 14 s_->resize(in_size_);
49 15 }
50
51 /** Constructor.
52 */
53 1 basic_string_buffer(
54 basic_string_buffer&& other) noexcept
55 1 : s_(other.s_)
56 1 , max_size_(other.max_size_)
57 {
58 1 other.s_ = nullptr;
59 1 }
60
61 /** Constructor.
62 */
63 explicit
64 14 basic_string_buffer(
65 string_type* s,
66 std::size_t max_size =
67 std::size_t(-1)) noexcept
68 14 : s_(s)
69 14 , max_size_(
70 14 max_size > s_->max_size()
71
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 14 ? s_->max_size()
72 14 : max_size)
73 {
74
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 14 if(s_->size() > max_size_)
75 1 s_->resize(max_size_);
76 14 in_size_ = s_->size();
77 14 }
78
79 /** Assignment.
80 */
81 basic_string_buffer& operator=(
82 basic_string_buffer const&) = delete;
83
84 std::size_t
85 2 size() const noexcept
86 {
87 2 return in_size_;
88 }
89
90 std::size_t
91 2 max_size() const noexcept
92 {
93 2 return max_size_;
94 }
95
96 std::size_t
97 2 capacity() const noexcept
98 {
99
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 2 if(s_->capacity() <= max_size_)
100 1 return s_->capacity() - in_size_;
101 1 return max_size_ - in_size_;
102 }
103
104 const_buffers_type
105 2 data() const noexcept
106 {
107 2 return const_buffers_type(
108 4 s_->data(), in_size_);
109 }
110
111 mutable_buffers_type
112 6 prepare(std::size_t n)
113 {
114 // n exceeds available space
115
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 6 if(n > max_size_ - in_size_)
116 1 detail::throw_invalid_argument();
117
118
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 5 if( s_->size() < in_size_ + n)
119 4 s_->resize(in_size_ + n);
120 5 out_size_ = n;
121 5 return mutable_buffers_type(
122
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 10 &(*s_)[in_size_], out_size_);
123 }
124
125 2 void commit(std::size_t n) noexcept
126 {
127
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 2 if(n < out_size_)
128 1 in_size_ += n;
129 else
130 1 in_size_ += out_size_;
131 2 out_size_ = 0;
132 2 }
133
134 2 void consume(std::size_t n) noexcept
135 {
136
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 2 if(n < in_size_)
137 {
138 1 s_->erase(0, n);
139 1 in_size_ -= n;
140 }
141 else
142 {
143 1 in_size_ = 0;
144 }
145 2 out_size_ = 0;
146 2 }
147 };
148
149 using string_buffer = basic_string_buffer<char>;
150
151 } // buffers
152 } // boost
153
154 #endif
155