Revision control
Copy as Markdown
// Copyright (C) 2022 The Qt Company Ltd.
// Copyright (C) 2019 Alexey Edelev <semlanik@gmail.com>
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#ifndef QPROTOBUFSELFCHECKITERATOR_P_H
#define QPROTOBUFSELFCHECKITERATOR_P_H
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
//
#include <QtProtobuf/qtprotobufexports.h>
#include <QtCore/qnumeric.h>
#include <QtCore/qbytearray.h>
#include <iterator>
QT_BEGIN_NAMESPACE
class QProtobufSelfcheckIterator
{
public:
using difference_type = QByteArray::difference_type;
using iterator_category = std::random_access_iterator_tag;
using value_type = QByteArray::value_type;
using pointer = QByteArray::pointer;
using reference = QByteArray::reference;
QProtobufSelfcheckIterator() = default;
static QProtobufSelfcheckIterator fromView(QByteArrayView container)
{
QProtobufSelfcheckIterator iter(container);
return iter;
}
QProtobufSelfcheckIterator(const QProtobufSelfcheckIterator &other) = default;
QProtobufSelfcheckIterator &operator=(const QProtobufSelfcheckIterator &other) = default;
explicit operator QByteArray::const_iterator &() { return m_it; }
explicit operator QByteArray::const_iterator() const { return m_it; }
char operator*()
{
Q_ASSERT(isValid());
return *m_it;
}
bool isValid() const noexcept { return m_containerBegin <= m_it && m_it <= m_containerEnd; }
QProtobufSelfcheckIterator &operator++() noexcept
{
if (!isValid()) {
qWarning("Deserialization failed: Unexpected end of data.");
return *this;
}
++m_it;
return *this;
}
QProtobufSelfcheckIterator operator++(int) noexcept
{
QProtobufSelfcheckIterator old(*this);
operator++();
return old;
}
QProtobufSelfcheckIterator &operator--() noexcept
{
if (!isValid()) {
qWarning("Deserialization failed: Unexpected end of data.");
return *this;
}
--m_it;
return *this;
}
QProtobufSelfcheckIterator operator--(int) noexcept
{
QProtobufSelfcheckIterator old(*this);
operator--();
return old;
}
QProtobufSelfcheckIterator &operator+=(qsizetype count) noexcept
{
if (!isValid()) {
qWarning("Deserialization failed: Unexpected end of data.");
return *this;
}
m_it += count;
return *this;
}
QProtobufSelfcheckIterator &operator-=(qsizetype count) noexcept
{
if (!isValid()) {
qWarning("Deserialization failed: Unexpected end of data.");
return *this;
}
m_it -= count;
return *this;
}
const char *data() const { return m_it; }
qsizetype bytesLeft() const { return isValid() ? std::distance(m_it, m_containerEnd) : 0; }
private:
explicit QProtobufSelfcheckIterator(QByteArrayView container)
: m_containerBegin(container.begin()), m_containerEnd(container.end()),
m_it(container.begin())
{
}
friend bool operator==(const QProtobufSelfcheckIterator &lhs,
const QProtobufSelfcheckIterator &rhs) noexcept
{
Q_ASSERT(lhs.m_containerBegin == rhs.m_containerBegin);
Q_ASSERT(lhs.m_containerEnd == rhs.m_containerEnd);
return lhs.m_it == rhs.m_it;
}
friend bool operator!=(const QProtobufSelfcheckIterator &lhs,
const QProtobufSelfcheckIterator &rhs) noexcept
{
Q_ASSERT(lhs.m_containerBegin == rhs.m_containerBegin);
Q_ASSERT(lhs.m_containerEnd == rhs.m_containerEnd);
return lhs.m_it != rhs.m_it;
}
friend bool operator==(const QProtobufSelfcheckIterator &lhs,
const QByteArray::const_iterator &other) noexcept
{
Q_ASSERT(lhs.m_containerBegin <= other && other <= lhs.m_containerEnd);
return lhs.m_it == other;
}
friend bool operator!=(const QProtobufSelfcheckIterator &lhs,
const QByteArray::const_iterator &other) noexcept
{
Q_ASSERT(lhs.m_containerBegin <= other && other <= lhs.m_containerEnd);
return lhs.m_it != other;
}
friend qint64 operator-(const QProtobufSelfcheckIterator &lhs,
const QProtobufSelfcheckIterator &rhs) noexcept
{
Q_ASSERT(lhs.m_containerBegin == rhs.m_containerBegin);
return lhs.m_it - rhs.m_it;
}
QByteArrayView::const_iterator m_containerBegin;
QByteArrayView::const_iterator m_containerEnd;
QByteArrayView::const_iterator m_it;
};
inline QProtobufSelfcheckIterator operator+(const QProtobufSelfcheckIterator &it, qsizetype length)
{
QProtobufSelfcheckIterator copy = it;
copy += length;
return copy;
}
inline QProtobufSelfcheckIterator operator-(const QProtobufSelfcheckIterator &it, qsizetype length)
{
QProtobufSelfcheckIterator copy = it;
copy -= length;
return copy;
}
QT_END_NAMESPACE
#endif // QPROTOBUFSELFCHECKITERATOR_P_H