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
|
/****************************************************************************
**
** Copyright (C) 2017 Pier Luigi Fiorini <pierluigi.fiorini@gmail.com>
** Contact: https://www.qt.io/licensing/
**
** This file is part of the plugins of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or 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.GPL2 and 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-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
#include <QtCore/QFile>
#include "qedidparser_p.h"
#include "qedidvendortable_p.h"
#define EDID_DESCRIPTOR_ALPHANUMERIC_STRING 0xfe
#define EDID_DESCRIPTOR_PRODUCT_NAME 0xfc
#define EDID_DESCRIPTOR_SERIAL_NUMBER 0xff
#define EDID_OFFSET_DATA_BLOCKS 0x36
#define EDID_OFFSET_LAST_BLOCK 0x6c
#define EDID_OFFSET_PNP_ID 0x08
#define EDID_OFFSET_SERIAL 0x0c
#define EDID_PHYSICAL_WIDTH 0x15
#define EDID_OFFSET_PHYSICAL_HEIGHT 0x16
QT_BEGIN_NAMESPACE
QEdidParser::QEdidParser()
{
// Cache vendors list from pnp.ids
const QString fileName = QLatin1String("/usr/share/hwdata/pnp.ids");
if (QFile::exists(fileName)) {
QFile file(fileName);
if (file.open(QFile::ReadOnly)) {
while (!file.atEnd()) {
QString line = QString::fromUtf8(file.readLine()).trimmed();
if (line.startsWith(QLatin1Char('#')))
continue;
QStringList parts = line.split(QLatin1Char('\t'));
if (parts.count() > 1) {
QString pnpId = parts.at(0);
parts.removeFirst();
m_vendorCache[pnpId] = parts.join(QLatin1Char(' '));
}
}
file.close();
}
}
}
bool QEdidParser::parse(const QByteArray &blob)
{
const quint8 *data = reinterpret_cast<const quint8 *>(blob.constData());
const size_t length = blob.length();
// Verify header
if (length < 128)
return false;
if (data[0] != 0x00 || data[1] != 0xff)
return false;
/* Decode the PNP ID from three 5 bit words packed into 2 bytes
* /--08--\/--09--\
* 7654321076543210
* |\---/\---/\---/
* R C1 C2 C3 */
char pnpId[3];
pnpId[0] = 'A' + ((data[EDID_OFFSET_PNP_ID] & 0x7c) / 4) - 1;
pnpId[1] = 'A' + ((data[EDID_OFFSET_PNP_ID] & 0x3) * 8) + ((data[EDID_OFFSET_PNP_ID + 1] & 0xe0) / 32) - 1;
pnpId[2] = 'A' + (data[EDID_OFFSET_PNP_ID + 1] & 0x1f) - 1;
QString pnpIdString = QString::fromLatin1(pnpId, 3);
// Clear manufacturer
manufacturer = QString();
// Serial number, will be overwritten by an ASCII descriptor
// when and if it will be found
quint32 serial = data[EDID_OFFSET_SERIAL]
+ (data[EDID_OFFSET_SERIAL + 1] << 8)
+ (data[EDID_OFFSET_SERIAL + 2] << 16)
+ (data[EDID_OFFSET_SERIAL + 3] << 24);
if (serial > 0)
serialNumber = QString::number(serial);
else
serialNumber = QString();
// Parse EDID data
for (int i = 0; i < 5; ++i) {
const uint offset = EDID_OFFSET_DATA_BLOCKS + i * 18;
if (data[offset] != 0 || data[offset + 1] != 0 || data[offset + 2] != 0)
continue;
if (data[offset + 3] == EDID_DESCRIPTOR_PRODUCT_NAME)
model = parseEdidString(&data[offset + 5]);
else if (data[offset + 3] == EDID_DESCRIPTOR_ALPHANUMERIC_STRING)
identifier = parseEdidString(&data[offset + 5]);
else if (data[offset + 3] == EDID_DESCRIPTOR_SERIAL_NUMBER)
serialNumber = parseEdidString(&data[offset + 5]);
}
// Try to use cache first because it is potentially more updated
manufacturer = m_vendorCache.value(pnpIdString);
if (manufacturer.isEmpty()) {
// Find the manufacturer from the vendor lookup table
for (const auto &vendor : q_edidVendorTable) {
if (strncmp(vendor.id, pnpId, 3) == 0) {
manufacturer = QString::fromUtf8(vendor.name);
break;
}
}
}
// If we don't know the manufacturer, fallback to PNP ID
if (manufacturer.isEmpty())
manufacturer = pnpIdString;
// Physical size
physicalSize = QSizeF(data[EDID_PHYSICAL_WIDTH], data[EDID_OFFSET_PHYSICAL_HEIGHT]) * 10;
return true;
}
QString QEdidParser::parseEdidString(const quint8 *data)
{
QByteArray buffer(reinterpret_cast<const char *>(data), 13);
// Erase carriage return and line feed
buffer = buffer.replace('\r', '\0').replace('\n', '\0');
// Replace non-printable characters with dash
for (int i = 0; i < buffer.count(); ++i) {
if (buffer[i] < '\040' || buffer[i] > '\176')
buffer[i] = '-';
}
return QString::fromLatin1(buffer.trimmed());
}
QT_END_NAMESPACE
|
