1// Copyright (C) 2022 The Qt Company Ltd.
2// Copyright (C) 2019 Alexey Edelev <semlanik@gmail.com>
3// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
4
5#ifndef QPROTOBUFSELFCHECKITERATOR_P_H
6#define QPROTOBUFSELFCHECKITERATOR_P_H
7
8//
9// W A R N I N G
10// -------------
11//
12// This file is not part of the Qt API. It exists purely as an
13// implementation detail. This header file may change from version to
14// version without notice, or even be removed.
15//
16// We mean it.
17//
18
19#include <QtProtobuf/qtprotobufexports.h>
20
21#include <QtCore/qnumeric.h>
22#include <QtCore/qbytearray.h>
23
24#include <iterator>
25
26QT_BEGIN_NAMESPACE
27
28class QProtobufSelfcheckIterator
29{
30public:
31 using difference_type = QByteArray::difference_type;
32 using iterator_category = std::random_access_iterator_tag;
33 using value_type = QByteArray::value_type;
34 using pointer = QByteArray::pointer;
35 using reference = QByteArray::reference;
36
37 QProtobufSelfcheckIterator() = default;
38
39 static QProtobufSelfcheckIterator fromView(QByteArrayView container)
40 {
41 QProtobufSelfcheckIterator iter(container);
42 return iter;
43 }
44
45 QProtobufSelfcheckIterator(const QProtobufSelfcheckIterator &other) = default;
46 QProtobufSelfcheckIterator &operator=(const QProtobufSelfcheckIterator &other) = default;
47
48 explicit operator QByteArray::const_iterator &() { return m_it; }
49 explicit operator QByteArray::const_iterator() const { return m_it; }
50
51 char operator*()
52 {
53 Q_ASSERT(isValid());
54 return *m_it;
55 }
56
57 bool isValid() const noexcept { return m_containerBegin <= m_it && m_it <= m_containerEnd; }
58
59 QProtobufSelfcheckIterator &operator++() noexcept
60 {
61 if (!isValid()) {
62 qWarning(msg: "Deserialization failed: Unexpected end of data.");
63 return *this;
64 }
65 ++m_it;
66 return *this;
67 }
68
69 QProtobufSelfcheckIterator operator++(int) noexcept
70 {
71 QProtobufSelfcheckIterator old(*this);
72 operator++();
73 return old;
74 }
75
76 QProtobufSelfcheckIterator &operator--() noexcept
77 {
78 if (!isValid()) {
79 qWarning(msg: "Deserialization failed: Unexpected end of data.");
80 return *this;
81 }
82
83 --m_it;
84 return *this;
85 }
86
87 QProtobufSelfcheckIterator operator--(int) noexcept
88 {
89 QProtobufSelfcheckIterator old(*this);
90 operator--();
91 return old;
92 }
93
94 QProtobufSelfcheckIterator &operator+=(qsizetype count) noexcept
95 {
96 if (!isValid()) {
97 qWarning(msg: "Deserialization failed: Unexpected end of data.");
98 return *this;
99 }
100 m_it += count;
101 return *this;
102 }
103
104 QProtobufSelfcheckIterator &operator-=(qsizetype count) noexcept
105 {
106 if (!isValid()) {
107 qWarning(msg: "Deserialization failed: Unexpected end of data.");
108 return *this;
109 }
110 m_it -= count;
111 return *this;
112 }
113
114 const char *data() const { return m_it; }
115 qsizetype bytesLeft() const { return isValid() ? std::distance(first: m_it, last: m_containerEnd) : 0; }
116
117private:
118 explicit QProtobufSelfcheckIterator(QByteArrayView container)
119 : m_containerBegin(container.begin()), m_containerEnd(container.end()),
120 m_it(container.begin())
121 {
122 }
123
124 friend bool operator==(const QProtobufSelfcheckIterator &lhs,
125 const QProtobufSelfcheckIterator &rhs) noexcept
126 {
127 Q_ASSERT(lhs.m_containerBegin == rhs.m_containerBegin);
128 Q_ASSERT(lhs.m_containerEnd == rhs.m_containerEnd);
129 return lhs.m_it == rhs.m_it;
130 }
131 friend bool operator!=(const QProtobufSelfcheckIterator &lhs,
132 const QProtobufSelfcheckIterator &rhs) noexcept
133 {
134 Q_ASSERT(lhs.m_containerBegin == rhs.m_containerBegin);
135 Q_ASSERT(lhs.m_containerEnd == rhs.m_containerEnd);
136 return lhs.m_it != rhs.m_it;
137 }
138 friend bool operator==(const QProtobufSelfcheckIterator &lhs,
139 const QByteArray::const_iterator &other) noexcept
140 {
141 Q_ASSERT(lhs.m_containerBegin <= other && other <= lhs.m_containerEnd);
142 return lhs.m_it == other;
143 }
144 friend bool operator!=(const QProtobufSelfcheckIterator &lhs,
145 const QByteArray::const_iterator &other) noexcept
146 {
147 Q_ASSERT(lhs.m_containerBegin <= other && other <= lhs.m_containerEnd);
148 return lhs.m_it != other;
149 }
150
151 friend qint64 operator-(const QProtobufSelfcheckIterator &lhs,
152 const QProtobufSelfcheckIterator &rhs) noexcept
153 {
154 Q_ASSERT(lhs.m_containerBegin == rhs.m_containerBegin);
155 return lhs.m_it - rhs.m_it;
156 }
157
158 QByteArrayView::const_iterator m_containerBegin;
159 QByteArrayView::const_iterator m_containerEnd;
160 QByteArrayView::const_iterator m_it;
161};
162
163inline QProtobufSelfcheckIterator operator+(const QProtobufSelfcheckIterator &it, qsizetype length)
164{
165 QProtobufSelfcheckIterator copy = it;
166 copy += length;
167 return copy;
168}
169
170inline QProtobufSelfcheckIterator operator-(const QProtobufSelfcheckIterator &it, qsizetype length)
171{
172 QProtobufSelfcheckIterator copy = it;
173 copy -= length;
174 return copy;
175}
176
177QT_END_NAMESPACE
178
179#endif // QPROTOBUFSELFCHECKITERATOR_P_H
180

source code of qtgrpc/src/protobuf/qprotobufselfcheckiterator_p.h