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
|
/*
* Copyright 2003-2018 The Music Player Daemon Project
* http://www.musicpd.org
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "BufferedSocket.hxx"
#include "net/SocketError.hxx"
#include "util/Compiler.h"
#include <algorithm>
BufferedSocket::ssize_t
BufferedSocket::DirectRead(void *data, size_t length) noexcept
{
const auto nbytes = GetSocket().Read((char *)data, length);
if (gcc_likely(nbytes > 0))
return nbytes;
if (nbytes == 0) {
OnSocketClosed();
return -1;
}
const auto code = GetSocketError();
if (IsSocketErrorAgain(code))
return 0;
if (IsSocketErrorClosed(code))
OnSocketClosed();
else
OnSocketError(std::make_exception_ptr(MakeSocketError(code, "Failed to receive from socket")));
return -1;
}
bool
BufferedSocket::ReadToBuffer() noexcept
{
assert(IsDefined());
const auto buffer = input.Write();
assert(!buffer.empty());
const auto nbytes = DirectRead(buffer.data, buffer.size);
if (nbytes > 0)
input.Append(nbytes);
return nbytes >= 0;
}
bool
BufferedSocket::ResumeInput() noexcept
{
assert(IsDefined());
while (true) {
const auto buffer = input.Read();
if (buffer.empty()) {
ScheduleRead();
return true;
}
const auto result = OnSocketInput(buffer.data, buffer.size);
switch (result) {
case InputResult::MORE:
if (input.IsFull()) {
OnSocketError(std::make_exception_ptr(std::runtime_error("Input buffer is full")));
return false;
}
ScheduleRead();
return true;
case InputResult::PAUSE:
CancelRead();
return true;
case InputResult::AGAIN:
continue;
case InputResult::CLOSED:
return false;
}
}
}
bool
BufferedSocket::OnSocketReady(unsigned flags) noexcept
{
assert(IsDefined());
if (gcc_unlikely(flags & (ERROR|HANGUP))) {
OnSocketClosed();
return false;
}
if (flags & READ) {
assert(!input.IsFull());
if (!ReadToBuffer() || !ResumeInput())
return false;
if (!input.IsFull())
ScheduleRead();
}
return true;
}
|
