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
|
/*
Copyright (c) 2007-2010 iMatix Corporation
This file is part of 0MQ.
0MQ is free software; you can redistribute it and/or modify it under
the terms of the Lesser GNU 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
Lesser GNU General Public License for more details.
You should have received a copy of the Lesser GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <string.h>
#include "zmq_decoder.hpp"
#include "i_inout.hpp"
#include "wire.hpp"
#include "err.hpp"
zmq::zmq_decoder_t::zmq_decoder_t (size_t bufsize_) :
decoder_t <zmq_decoder_t> (bufsize_),
destination (NULL)
{
zmq_msg_init (&in_progress);
// At the beginning, read one byte and go to one_byte_size_ready state.
next_step (tmpbuf, 1, &zmq_decoder_t::one_byte_size_ready);
}
zmq::zmq_decoder_t::~zmq_decoder_t ()
{
zmq_msg_close (&in_progress);
}
void zmq::zmq_decoder_t::set_inout (i_inout *destination_)
{
destination = destination_;
}
void zmq::zmq_decoder_t::add_prefix (const blob_t &prefix_)
{
prefix = prefix_;
}
bool zmq::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, &zmq_decoder_t::eight_byte_size_ready);
else {
// TODO: Handle over-sized message decently.
// 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...
if (prefix.empty ()) {
int rc = zmq_msg_init_size (&in_progress, *tmpbuf - 1);
errno_assert (rc == 0);
}
else {
int rc = zmq_msg_init_size (&in_progress,
1 + prefix.size () + *tmpbuf - 1);
errno_assert (rc == 0);
unsigned char *data = (unsigned char*) zmq_msg_data (&in_progress);
*data = (unsigned char) prefix.size ();
memcpy (data + 1, prefix.data (), *data);
}
next_step (tmpbuf, 1, &zmq_decoder_t::flags_ready);
}
return true;
}
bool zmq::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);
// TODO: Handle over-sized message decently.
// 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...
if (prefix.empty ()) {
int rc = zmq_msg_init_size (&in_progress, size - 1);
errno_assert (rc == 0);
}
else {
int rc = zmq_msg_init_size (&in_progress,
1 + prefix.size () + size - 1);
errno_assert (rc == 0);
unsigned char *data = (unsigned char*) zmq_msg_data (&in_progress);
*data = (unsigned char) prefix.size ();
memcpy (data + 1, prefix.data (), *data);
}
next_step (tmpbuf, 1, &zmq_decoder_t::flags_ready);
return true;
}
bool zmq::zmq_decoder_t::flags_ready ()
{
// Store the flags from the wire into the message structure.
in_progress.flags = tmpbuf [0];
if (prefix.empty ()) {
next_step (zmq_msg_data (&in_progress), zmq_msg_size (&in_progress),
&zmq_decoder_t::message_ready);
}
else {
next_step ((unsigned char*) zmq_msg_data (&in_progress) +
prefix.size () + 1,
zmq_msg_size (&in_progress) - prefix.size () - 1,
&zmq_decoder_t::message_ready);
}
return true;
}
bool zmq::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, &zmq_decoder_t::one_byte_size_ready);
return true;
}
|
