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
|
/****************************************************************************
**
** Copyright (C) 2017 Witekio.
** Copyright (C) 2018 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtCoap module.
**
** $QT_BEGIN_LICENSE:GPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 or (at your option) any later version
** approved by the KDE Free Qt Foundation. The licenses are as published by
** the Free Software Foundation and appearing in the file LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include "qcoapinternalreply_p.h"
#include <QtCore/qmath.h>
QT_BEGIN_NAMESPACE
/*!
\internal
\class QCoapInternalReply
\brief The QCoapInternalReply class contains data related to
a received message.
It is a subclass of QCoapInternalMessage.
\reentrant
\sa QCoapInternalMessage, QCoapInternalRequest
*/
/*!
\internal
Constructs a new QCoapInternalReply with \a parent as the parent object.
*/
QCoapInternalReply::QCoapInternalReply(QObject *parent) :
QCoapInternalMessage(*new QCoapInternalReplyPrivate, parent)
{
}
/*!
\internal
Constructs a copy of \a other with \a parent as the parent obect.
*/
QCoapInternalReply::QCoapInternalReply(const QCoapInternalReply &other, QObject *parent) :
QCoapInternalMessage(*new QCoapInternalReplyPrivate(*other.d_func()), parent)
{
}
/*!
\internal
Creates a QCoapInternalReply from the CoAP \a reply frame.
For more details, refer to section
\l{https://tools.ietf.org/html/rfc7252#section-3}{'Message format' of RFC 7252}.
*/
//! 0 1 2 3
//! 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
//! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//! |Ver| T | TKL | Code | Message ID |
//! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//! | Token (if any, TKL bytes) ...
//! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//! | Options (if any) ...
//! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
//! |1 1 1 1 1 1 1 1| Payload (if any) ...
//! +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
QCoapInternalReply *QCoapInternalReply::createFromFrame(const QByteArray &reply, QObject *parent)
{
QCoapInternalReply *internalReply = new QCoapInternalReply(parent);
QCoapInternalReplyPrivate *d = internalReply->d_func();
const quint8 *pduData = reinterpret_cast<const quint8 *>(reply.data());
// Parse Header and Token
d->message.setVersion((pduData[0] >> 6) & 0x03);
d->message.setType(QCoapMessage::Type((pduData[0] >> 4) & 0x03));
quint8 tokenLength = (pduData[0]) & 0x0F;
d->responseCode = static_cast<QtCoap::ResponseCode>(pduData[1]);
d->message.setMessageId(static_cast<quint16>((static_cast<quint16>(pduData[2]) << 8)
| static_cast<quint16>(pduData[3])));
d->message.setToken(reply.mid(4, tokenLength));
// Parse Options
int i = 4 + tokenLength;
quint16 lastOptionNumber = 0;
while (i != reply.length() && pduData[i] != 0xFF) {
quint16 optionDelta = ((pduData[i] >> 4) & 0x0F);
quint16 optionLength = (pduData[i] & 0x0F);
// Delta value > 12 : special values
if (optionDelta == 13) {
++i;
optionDelta = pduData[i] + 13;
} else if (optionDelta == 14) {
++i;
optionDelta = pduData[i] + 269;
}
// Delta length > 12 : special values
if (optionLength == 13) {
++i;
optionLength = pduData[i] + 13;
} else if (optionLength == 14) {
++i;
optionLength = pduData[i] + 269;
}
quint16 optionNumber = lastOptionNumber + optionDelta;
internalReply->addOption(QCoapOption::OptionName(optionNumber),
reply.mid(i + 1, optionLength));
lastOptionNumber = optionNumber;
i += 1 + optionLength;
}
// Parse Payload
if (pduData[i] == 0xFF) {
// -1 because of 0xFF at the beginning
QByteArray currentPayload = reply.mid(i + 1);
d->message.setPayload(d->message.payload().append(currentPayload));
}
return internalReply;
}
/*!
\internal
Appends the given \a data byte array to the current payload.
*/
void QCoapInternalReply::appendData(const QByteArray &data)
{
Q_D(QCoapInternalReply);
d->message.setPayload(d->message.payload().append(data));
}
/*!
\internal
Adds the given CoAP \a option and sets block parameters if needed.
*/
void QCoapInternalReply::addOption(const QCoapOption &option)
{
if (option.name() == QCoapOption::Block2)
setFromDescriptiveBlockOption(option);
QCoapInternalMessage::addOption(option);
}
/*!
\internal
Sets the sender address.
*/
void QCoapInternalReply::setSenderAddress(const QHostAddress &address)
{
Q_D(QCoapInternalReply);
d->senderAddress = address;
}
/*!
\internal
Returns the number of the next block, if there is another block to come,
otherwise -1.
For more details, refer to the
\l{https://tools.ietf.org/html/rfc7959#section-2.2}{RFC 7959}.
*/
int QCoapInternalReply::nextBlockToSend() const
{
Q_D(const QCoapInternalReply);
QCoapOption option = d->message.option(QCoapOption::Block1);
if (!option.isValid())
return -1;
const auto value = option.opaqueValue();
const quint8 *optionData = reinterpret_cast<const quint8 *>(value.data());
const quint8 lastByte = optionData[option.length() - 1];
// M field
bool hasNextBlock = ((lastByte & 0x8) == 0x8);
if (!hasNextBlock)
return -1;
// NUM field
quint32 blockNumber = 0;
for (int i = 0; i < option.length() - 1; ++i)
blockNumber = (blockNumber << 8) | optionData[i];
blockNumber = (blockNumber << 4) | (lastByte >> 4);
return static_cast<int>(blockNumber) + 1;
}
/*!
\internal
Returns \c true if the client has one or more blocks to send.
*/
bool QCoapInternalReply::hasMoreBlocksToSend() const
{
return nextBlockToSend() >= 0;
}
/*!
\internal
Returns the response code of the reply.
*/
QtCoap::ResponseCode QCoapInternalReply::responseCode() const
{
Q_D(const QCoapInternalReply);
return d->responseCode;
}
/*!
\internal
Returns the host address from which the reply was received.
*/
QHostAddress QCoapInternalReply::senderAddress() const
{
Q_D(const QCoapInternalReply);
return d->senderAddress;
}
QT_END_NAMESPACE
|
