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
|
/*
Copyright (c) 2007-2011 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 "decoder.hpp"
#include "i_inout.hpp"
#include "wire.hpp"
#include "err.hpp"
zmq::decoder_t::decoder_t (size_t bufsize_, int64_t maxmsgsize_) :
decoder_base_t <decoder_t> (bufsize_),
destination (NULL),
maxmsgsize (maxmsgsize_)
{
int rc = in_progress.init ();
errno_assert (rc == 0);
// At the beginning, read one byte and go to one_byte_size_ready state.
next_step (tmpbuf, 1, &decoder_t::one_byte_size_ready);
}
zmq::decoder_t::~decoder_t ()
{
int rc = in_progress.close ();
errno_assert (rc == 0);
}
void zmq::decoder_t::set_inout (i_inout *destination_)
{
destination = destination_;
}
bool zmq::decoder_t::one_byte_size_ready ()
{
// First byte of size is read. If it is 0xff read 8-byte size.
// Otherwise allocate the buffer for message data and read the
// message data into it.
if (*tmpbuf == 0xff)
next_step (tmpbuf, 8, &decoder_t::eight_byte_size_ready);
else {
// There has to be at least one byte (the flags) in the message).
if (!*tmpbuf) {
decoding_error ();
return false;
}
// 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...
int rc;
if (maxmsgsize >= 0 && (int64_t) (*tmpbuf - 1) > maxmsgsize) {
rc = -1;
errno = ENOMEM;
}
else
rc = in_progress.init_size (*tmpbuf - 1);
if (rc != 0 && errno == ENOMEM) {
rc = in_progress.init ();
errno_assert (rc == 0);
decoding_error ();
return false;
}
errno_assert (rc == 0);
next_step (tmpbuf, 1, &decoder_t::flags_ready);
}
return true;
}
bool zmq::decoder_t::eight_byte_size_ready ()
{
// 8-byte size is read. Allocate the buffer for message body and
// read the message data into it.
size_t size = (size_t) get_uint64 (tmpbuf);
// There has to be at least one byte (the flags) in the message).
if (!size) {
decoding_error ();
return false;
}
// 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...
int rc;
if (maxmsgsize >= 0 && (int64_t) (size - 1) > maxmsgsize) {
rc = -1;
errno = ENOMEM;
}
else
rc = in_progress.init_size (size - 1);
if (rc != 0 && errno == ENOMEM) {
rc = in_progress.init ();
errno_assert (rc == 0);
decoding_error ();
return false;
}
errno_assert (rc == 0);
next_step (tmpbuf, 1, &decoder_t::flags_ready);
return true;
}
bool zmq::decoder_t::flags_ready ()
{
// Store the flags from the wire into the message structure.
in_progress.set_flags (tmpbuf [0]);
next_step (in_progress.data (), in_progress.size (),
&decoder_t::message_ready);
return true;
}
bool zmq::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 (!destination || !destination->write (&in_progress))
return false;
next_step (tmpbuf, 1, &decoder_t::one_byte_size_ready);
return true;
}
|
