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) 2018 Intel Corporation.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause
#include "datastreamconverter.h"
#include "debugtextdumper.h"
#include "variantorderedmap.h"
#include <QDataStream>
using namespace Qt::StringLiterals;
static const char dataStreamOptionHelp[] =
"byteorder=host|big|little Byte order to use.\n"
"version=<n> QDataStream version (default: Qt 6.0).\n"
;
static const char signature[] = "qds";
static DataStreamConverter dataStreamConverter;
static DebugTextDumper debugTextDumper;
QDataStream &operator<<(QDataStream &ds, const VariantOrderedMap &map)
{
ds << qint64(map.size());
for (const auto &pair : map)
ds << pair.first << pair.second;
return ds;
}
QDataStream &operator>>(QDataStream &ds, VariantOrderedMap &map)
{
map.clear();
qint64 size;
ds >> size;
map.reserve(size);
while (size-- > 0) {
VariantOrderedMap::value_type pair;
ds >> pair.first >> pair.second;
map.append(pair);
}
return ds;
}
DataStreamConverter::DataStreamConverter()
{
qRegisterMetaType<VariantOrderedMap>();
}
QString DataStreamConverter::name() const
{
return "datastream"_L1;
}
Converter::Directions DataStreamConverter::directions() const
{
return Direction::InOut;
}
Converter::Options DataStreamConverter::outputOptions() const
{
return SupportsArbitraryMapKeys;
}
const char *DataStreamConverter::optionsHelp() const
{
return dataStreamOptionHelp;
}
bool DataStreamConverter::probeFile(QIODevice *f) const
{
return f->isReadable() && f->peek(sizeof(signature) - 1) == signature;
}
QVariant DataStreamConverter::loadFile(QIODevice *f, const Converter *&outputConverter) const
{
if (!outputConverter)
outputConverter = &debugTextDumper;
char c;
if (f->read(sizeof(signature) - 1) != signature || !f->getChar(&c) || (c != 'l' && c != 'B'))
qFatal("Could not load QDataStream file: invalid signature.");
QDataStream ds(f);
ds.setByteOrder(c == 'l' ? QDataStream::LittleEndian : QDataStream::BigEndian);
std::underlying_type<QDataStream::Version>::type version;
ds >> version;
ds.setVersion(QDataStream::Version(version));
QVariant result;
ds >> result;
return result;
}
void DataStreamConverter::saveFile(QIODevice *f, const QVariant &contents,
const QStringList &options) const
{
QDataStream::Version version = QDataStream::Qt_6_0;
auto order = QDataStream::ByteOrder(QSysInfo::ByteOrder);
for (const QString &option : options) {
const QStringList pair = option.split('=');
if (pair.size() == 2) {
if (pair.first() == "byteorder") {
if (pair.last() == "little") {
order = QDataStream::LittleEndian;
continue;
} else if (pair.last() == "big") {
order = QDataStream::BigEndian;
continue;
} else if (pair.last() == "host") {
order = QDataStream::ByteOrder(QSysInfo::ByteOrder);
continue;
}
}
if (pair.first() == "version") {
bool ok;
int n = pair.last().toInt(&ok);
if (ok) {
version = QDataStream::Version(n);
continue;
}
qFatal("Invalid version number '%s': must be a number from 1 to %d.",
qPrintable(pair.last()), QDataStream::Qt_DefaultCompiledVersion);
}
}
qFatal("Unknown QDataStream formatting option '%s'. Available options are:\n%s",
qPrintable(option), dataStreamOptionHelp);
}
char c = order == QDataStream::LittleEndian ? 'l' : 'B';
f->write(signature);
f->write(&c, 1);
QDataStream ds(f);
ds.setVersion(version);
ds.setByteOrder(order);
ds << std::underlying_type<decltype(version)>::type(version);
ds << contents;
}
|
