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1 | // |
2 | // detail/buffered_stream_storage.hpp | |
3 | // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ | |
4 | // | |
5 | // Copyright (c) 2003-2016 Christopher M. Kohlhoff (chris at kohlhoff dot com) | |
6 | // | |
7 | // Distributed under the Boost Software License, Version 1.0. (See accompanying | |
8 | // file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt) | |
9 | // | |
10 | ||
11 | #ifndef BOOST_ASIO_DETAIL_BUFFERED_STREAM_STORAGE_HPP | |
12 | #define BOOST_ASIO_DETAIL_BUFFERED_STREAM_STORAGE_HPP | |
13 | ||
14 | #if defined(_MSC_VER) && (_MSC_VER >= 1200) | |
15 | # pragma once | |
16 | #endif // defined(_MSC_VER) && (_MSC_VER >= 1200) | |
17 | ||
18 | #include <boost/asio/detail/config.hpp> | |
19 | #include <boost/asio/buffer.hpp> | |
20 | #include <boost/asio/detail/assert.hpp> | |
21 | #include <cstddef> | |
22 | #include <cstring> | |
23 | #include <vector> | |
24 | ||
25 | #include <boost/asio/detail/push_options.hpp> | |
26 | ||
27 | namespace boost { | |
28 | namespace asio { | |
29 | namespace detail { | |
30 | ||
31 | class buffered_stream_storage | |
32 | { | |
33 | public: | |
34 | // The type of the bytes stored in the buffer. | |
35 | typedef unsigned char byte_type; | |
36 | ||
37 | // The type used for offsets into the buffer. | |
38 | typedef std::size_t size_type; | |
39 | ||
40 | // Constructor. | |
41 | explicit buffered_stream_storage(std::size_t buffer_capacity) | |
42 | : begin_offset_(0), | |
43 | end_offset_(0), | |
44 | buffer_(buffer_capacity) | |
45 | { | |
46 | } | |
47 | ||
48 | /// Clear the buffer. | |
49 | void clear() | |
50 | { | |
51 | begin_offset_ = 0; | |
52 | end_offset_ = 0; | |
53 | } | |
54 | ||
55 | // Return a pointer to the beginning of the unread data. | |
56 | mutable_buffer data() | |
57 | { | |
58 | return boost::asio::buffer(buffer_) + begin_offset_; | |
59 | } | |
60 | ||
61 | // Return a pointer to the beginning of the unread data. | |
62 | const_buffer data() const | |
63 | { | |
64 | return boost::asio::buffer(buffer_) + begin_offset_; | |
65 | } | |
66 | ||
67 | // Is there no unread data in the buffer. | |
68 | bool empty() const | |
69 | { | |
70 | return begin_offset_ == end_offset_; | |
71 | } | |
72 | ||
73 | // Return the amount of unread data the is in the buffer. | |
74 | size_type size() const | |
75 | { | |
76 | return end_offset_ - begin_offset_; | |
77 | } | |
78 | ||
79 | // Resize the buffer to the specified length. | |
80 | void resize(size_type length) | |
81 | { | |
82 | BOOST_ASIO_ASSERT(length <= capacity()); | |
83 | if (begin_offset_ + length <= capacity()) | |
84 | { | |
85 | end_offset_ = begin_offset_ + length; | |
86 | } | |
87 | else | |
88 | { | |
89 | using namespace std; // For memmove. | |
90 | memmove(&buffer_[0], &buffer_[0] + begin_offset_, size()); | |
91 | end_offset_ = length; | |
92 | begin_offset_ = 0; | |
93 | } | |
94 | } | |
95 | ||
96 | // Return the maximum size for data in the buffer. | |
97 | size_type capacity() const | |
98 | { | |
99 | return buffer_.size(); | |
100 | } | |
101 | ||
102 | // Consume multiple bytes from the beginning of the buffer. | |
103 | void consume(size_type count) | |
104 | { | |
105 | BOOST_ASIO_ASSERT(begin_offset_ + count <= end_offset_); | |
106 | begin_offset_ += count; | |
107 | if (empty()) | |
108 | clear(); | |
109 | } | |
110 | ||
111 | private: | |
112 | // The offset to the beginning of the unread data. | |
113 | size_type begin_offset_; | |
114 | ||
115 | // The offset to the end of the unread data. | |
116 | size_type end_offset_; | |
117 | ||
118 | // The data in the buffer. | |
119 | std::vector<byte_type> buffer_; | |
120 | }; | |
121 | ||
122 | } // namespace detail | |
123 | } // namespace asio | |
124 | } // namespace boost | |
125 | ||
126 | #include <boost/asio/detail/pop_options.hpp> | |
127 | ||
128 | #endif // BOOST_ASIO_DETAIL_BUFFERED_STREAM_STORAGE_HPP |