1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
|
//
// detail/buffer_sequence_adapter.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2010 Christopher M. Kohlhoff (chris at kohlhoff dot com)
//
// Distributed under the Boost Software License, Version 1.0. (See accompanying
// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
//
#ifndef BOOST_ASIO_DETAIL_BUFFER_SEQUENCE_ADAPTER_HPP
#define BOOST_ASIO_DETAIL_BUFFER_SEQUENCE_ADAPTER_HPP
#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
#include <boost/asio/detail/config.hpp>
#include <boost/asio/buffer.hpp>
#include <boost/asio/detail/socket_types.hpp>
#include <boost/asio/detail/push_options.hpp>
namespace boost {
namespace asio {
namespace detail {
class buffer_sequence_adapter_base
{
protected:
#if defined(BOOST_WINDOWS) || defined(__CYGWIN__)
typedef WSABUF native_buffer_type;
static void init_native_buffer(WSABUF& buf,
const boost::asio::mutable_buffer& buffer)
{
buf.buf = boost::asio::buffer_cast<char*>(buffer);
buf.len = static_cast<ULONG>(boost::asio::buffer_size(buffer));
}
static void init_native_buffer(WSABUF& buf,
const boost::asio::const_buffer& buffer)
{
buf.buf = const_cast<char*>(boost::asio::buffer_cast<const char*>(buffer));
buf.len = static_cast<ULONG>(boost::asio::buffer_size(buffer));
}
#else // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
typedef iovec native_buffer_type;
static void init_iov_base(void*& base, void* addr)
{
base = addr;
}
template <typename T>
static void init_iov_base(T& base, void* addr)
{
base = static_cast<T>(addr);
}
static void init_native_buffer(iovec& iov,
const boost::asio::mutable_buffer& buffer)
{
init_iov_base(iov.iov_base, boost::asio::buffer_cast<void*>(buffer));
iov.iov_len = boost::asio::buffer_size(buffer);
}
static void init_native_buffer(iovec& iov,
const boost::asio::const_buffer& buffer)
{
init_iov_base(iov.iov_base, const_cast<void*>(
boost::asio::buffer_cast<const void*>(buffer)));
iov.iov_len = boost::asio::buffer_size(buffer);
}
#endif // defined(BOOST_WINDOWS) || defined(__CYGWIN__)
};
// Helper class to translate buffers into the native buffer representation.
template <typename Buffer, typename Buffers>
class buffer_sequence_adapter
: buffer_sequence_adapter_base
{
public:
explicit buffer_sequence_adapter(const Buffers& buffers)
: count_(0), total_buffer_size_(0)
{
typename Buffers::const_iterator iter = buffers.begin();
typename Buffers::const_iterator end = buffers.end();
for (; iter != end && count_ < max_buffers; ++iter, ++count_)
{
Buffer buffer(*iter);
init_native_buffer(buffers_[count_], buffer);
total_buffer_size_ += boost::asio::buffer_size(buffer);
}
}
native_buffer_type* buffers()
{
return buffers_;
}
std::size_t count() const
{
return count_;
}
bool all_empty() const
{
return total_buffer_size_ == 0;
}
static bool all_empty(const Buffers& buffers)
{
typename Buffers::const_iterator iter = buffers.begin();
typename Buffers::const_iterator end = buffers.end();
std::size_t i = 0;
for (; iter != end && i < max_buffers; ++iter, ++i)
if (boost::asio::buffer_size(Buffer(*iter)) > 0)
return false;
return true;
}
static void validate(const Buffers& buffers)
{
typename Buffers::const_iterator iter = buffers.begin();
typename Buffers::const_iterator end = buffers.end();
for (; iter != end; ++iter)
{
Buffer buffer(*iter);
boost::asio::buffer_cast<const void*>(buffer);
}
}
static Buffer first(const Buffers& buffers)
{
typename Buffers::const_iterator iter = buffers.begin();
typename Buffers::const_iterator end = buffers.end();
for (; iter != end; ++iter)
{
Buffer buffer(*iter);
if (boost::asio::buffer_size(buffer) != 0)
return buffer;
}
return Buffer();
}
private:
// The maximum number of buffers to support in a single operation.
enum { max_buffers = 64 < max_iov_len ? 64 : max_iov_len };
native_buffer_type buffers_[max_buffers];
std::size_t count_;
std::size_t total_buffer_size_;
};
template <typename Buffer>
class buffer_sequence_adapter<Buffer, boost::asio::mutable_buffers_1>
: buffer_sequence_adapter_base
{
public:
explicit buffer_sequence_adapter(
const boost::asio::mutable_buffers_1& buffers)
{
init_native_buffer(buffer_, Buffer(buffers));
total_buffer_size_ = boost::asio::buffer_size(buffers);
}
native_buffer_type* buffers()
{
return &buffer_;
}
std::size_t count() const
{
return 1;
}
bool all_empty() const
{
return total_buffer_size_ == 0;
}
static bool all_empty(const boost::asio::mutable_buffers_1& buffers)
{
return boost::asio::buffer_size(buffers) == 0;
}
static void validate(const boost::asio::mutable_buffers_1& buffers)
{
boost::asio::buffer_cast<const void*>(buffers);
}
static Buffer first(const boost::asio::mutable_buffers_1& buffers)
{
return Buffer(buffers);
}
private:
native_buffer_type buffer_;
std::size_t total_buffer_size_;
};
template <typename Buffer>
class buffer_sequence_adapter<Buffer, boost::asio::const_buffers_1>
: buffer_sequence_adapter_base
{
public:
explicit buffer_sequence_adapter(
const boost::asio::const_buffers_1& buffers)
{
init_native_buffer(buffer_, Buffer(buffers));
total_buffer_size_ = boost::asio::buffer_size(buffers);
}
native_buffer_type* buffers()
{
return &buffer_;
}
std::size_t count() const
{
return 1;
}
bool all_empty() const
{
return total_buffer_size_ == 0;
}
static bool all_empty(const boost::asio::const_buffers_1& buffers)
{
return boost::asio::buffer_size(buffers) == 0;
}
static void validate(const boost::asio::const_buffers_1& buffers)
{
boost::asio::buffer_cast<const void*>(buffers);
}
static Buffer first(const boost::asio::const_buffers_1& buffers)
{
return Buffer(buffers);
}
private:
native_buffer_type buffer_;
std::size_t total_buffer_size_;
};
} // namespace detail
} // namespace asio
} // namespace boost
#include <boost/asio/detail/pop_options.hpp>
#endif // BOOST_ASIO_DETAIL_BUFFER_SEQUENCE_ADAPTER_HPP
|