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
|
/**************************************************************************
**
** Copyright (C) 2017 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the Qt Installer Framework.
**
** $QT_BEGIN_LICENSE:GPL-EXCEPT$
** 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 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** 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 "protocol.h"
#include <QIODevice>
namespace QInstaller {
typedef qint32 PackageSize;
/*!
\inmodule QtInstallerFramework
\namespace Protocol
\brief Contains values related to the internal client-server connection protocol.
*/
/*!
\enum Protocol::Mode
\value Debug
\value Production
*/
/*!
\enum Protocol::StartAs
\value User
\value SuperUser
*/
/*!
Write a packet containing \a command and \a data to \a device.
\note Both client and server need to have the same endianness.
*/
void sendPacket(QIODevice *device, const QByteArray &command, const QByteArray &data)
{
// use aliasing for writing payload size into bytes
char payloadBytes[sizeof(PackageSize)];
PackageSize *payloadSize = reinterpret_cast<PackageSize*>(&payloadBytes);
*payloadSize = command.size() + sizeof(char) + data.size();
QByteArray packet;
packet.reserve(sizeof(PackageSize) + *payloadSize);
packet.append(payloadBytes, sizeof(PackageSize));
packet.append(command);
packet.append('\0');
packet.append(data);
forever {
const int bytesWritten = device->write(packet);
Q_ASSERT(bytesWritten >= 0);
if (bytesWritten == packet.size())
break;
packet.remove(0, bytesWritten);
}
}
/*!
Reads a packet from \a device, and stores its content into \a command and \a data.
Returns \c false if the packet in the device buffer is yet incomplete, \c true otherwise.
\note Both client and server need to have the same endianness.
*/
bool receivePacket(QIODevice *device, QByteArray *command, QByteArray *data)
{
if (device->bytesAvailable() < static_cast<qint64>(sizeof(PackageSize)))
return false;
// read payload size
char payloadBytes[sizeof(PackageSize)];
PackageSize *payloadSize = reinterpret_cast<PackageSize*>(&payloadBytes);
device->read(payloadBytes, sizeof(PackageSize));
// not enough data yet? back off ...
if (device->bytesAvailable() < *payloadSize) {
for (int i = sizeof(PackageSize) - 1; i >= 0; --i)
device->ungetChar(payloadBytes[i]);
return false;
}
const QByteArray payload = device->read(*payloadSize);
int separator = payload.indexOf('\0');
*command = payload.left(separator);
*data = payload.right(payload.size() - separator - 1);
return true;
}
} // namespace QInstaller
|
