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
|
/*
Copyright (c) 2009-2011 250bpm s.r.o.
Copyright (c) 2007-2009 iMatix Corporation
Copyright (c) 2007-2011 Other contributors as noted in the AUTHORS file
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
0MQ 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include "platform.hpp"
#ifdef ZMQ_HAVE_WINDOWS
#include "windows.hpp"
#endif
#include "v1_protocol.hpp"
#include "v1_decoder.hpp"
#include "likely.hpp"
#include "wire.hpp"
#include "err.hpp"
zmq::v1_decoder_t::v1_decoder_t (size_t bufsize_,
int64_t maxmsgsize_, i_msg_sink *msg_sink_) :
decoder_base_t <v1_decoder_t> (bufsize_),
msg_sink (msg_sink_),
msg_flags (0),
maxmsgsize (maxmsgsize_)
{
int rc = in_progress.init ();
errno_assert (rc == 0);
// At the beginning, read one byte and go to flags_ready state.
next_step (tmpbuf, 1, &v1_decoder_t::flags_ready);
}
zmq::v1_decoder_t::~v1_decoder_t ()
{
int rc = in_progress.close ();
errno_assert (rc == 0);
}
void zmq::v1_decoder_t::set_msg_sink (i_msg_sink *msg_sink_)
{
msg_sink = msg_sink_;
}
bool zmq::v1_decoder_t::flags_ready ()
{
msg_flags = 0;
if (tmpbuf [0] & v1_protocol_t::more_flag)
msg_flags |= msg_t::more;
// The payload length is either one or eight bytes,
// depending on whether the 'large' bit is set.
if (tmpbuf [0] & v1_protocol_t::large_flag)
next_step (tmpbuf, 8, &v1_decoder_t::eight_byte_size_ready);
else
next_step (tmpbuf, 1, &v1_decoder_t::one_byte_size_ready);
return true;
}
bool zmq::v1_decoder_t::one_byte_size_ready ()
{
int rc = 0;
// Message size must not exceed the maximum allowed size.
if (maxmsgsize >= 0)
if (unlikely (tmpbuf [0] > static_cast <uint64_t> (maxmsgsize)))
goto error;
// in_progress is initialised at this point so in theory we should
// close it before calling zmq_msg_init_size, however, it's a 0-byte
// message and thus we can treat it as uninitialised...
rc = in_progress.init_size (tmpbuf [0]);
if (unlikely (rc)) {
errno_assert (errno == ENOMEM);
int rc = in_progress.init ();
errno_assert (rc == 0);
goto error;
}
in_progress.set_flags (msg_flags);
next_step (in_progress.data (), in_progress.size (),
&v1_decoder_t::message_ready);
return true;
error:
decoding_error ();
return false;
}
bool zmq::v1_decoder_t::eight_byte_size_ready ()
{
int rc = 0;
// The payload size is encoded as 64-bit unsigned integer.
// The most significant byte comes first.
const uint64_t msg_size = get_uint64 (tmpbuf);
// Message size must not exceed the maximum allowed size.
if (maxmsgsize >= 0)
if (unlikely (msg_size > static_cast <uint64_t> (maxmsgsize)))
goto error;
// Message size must fit into size_t data type.
if (unlikely (msg_size != static_cast <size_t> (msg_size)))
goto error;
// in_progress is initialised at this point so in theory we should
// close it before calling init_size, however, it's a 0-byte
// message and thus we can treat it as uninitialised.
rc = in_progress.init_size (static_cast <size_t> (msg_size));
if (unlikely (rc)) {
errno_assert (errno == ENOMEM);
int rc = in_progress.init ();
errno_assert (rc == 0);
goto error;
}
in_progress.set_flags (msg_flags);
next_step (in_progress.data (), in_progress.size (),
&v1_decoder_t::message_ready);
return true;
error:
decoding_error ();
return false;
}
bool zmq::v1_decoder_t::message_ready ()
{
// Message is completely read. Push it further and start reading
// new message. (in_progress is a 0-byte message after this point.)
if (unlikely (!msg_sink))
return false;
int rc = msg_sink->push_msg (&in_progress);
if (unlikely (rc != 0)) {
if (errno != EAGAIN)
decoding_error ();
return false;
}
next_step (tmpbuf, 1, &v1_decoder_t::flags_ready);
return true;
}
|
