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// Copyright (C) 2019 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qwinregistry_p.h"
#include <QtCore/qvarlengtharray.h>
#include <algorithm>
QT_BEGIN_NAMESPACE
QWinRegistryKey::QWinRegistryKey() :
m_key(nullptr)
{
}
// Open a key with the specified permissions (KEY_READ/KEY_WRITE).
// "access" is to explicitly use the 32- or 64-bit branch.
QWinRegistryKey::QWinRegistryKey(HKEY parentHandle, QStringView subKey,
REGSAM permissions, REGSAM access)
{
if (RegOpenKeyEx(parentHandle, reinterpret_cast<const wchar_t *>(subKey.utf16()),
0, permissions | access, &m_key) != ERROR_SUCCESS) {
m_key = nullptr;
}
}
QWinRegistryKey::~QWinRegistryKey()
{
close();
}
void QWinRegistryKey::close()
{
if (isValid()) {
RegCloseKey(m_key);
m_key = nullptr;
}
}
QString QWinRegistryKey::stringValue(QStringView subKey) const
{
QString result;
if (!isValid())
return result;
DWORD type;
DWORD size;
auto subKeyC = reinterpret_cast<const wchar_t *>(subKey.utf16());
if (RegQueryValueEx(m_key, subKeyC, nullptr, &type, nullptr, &size) != ERROR_SUCCESS
|| (type != REG_SZ && type != REG_EXPAND_SZ) || size <= 2) {
return result;
}
// Reserve more for rare cases where trailing '\0' are missing in registry.
// Rely on 0-termination since strings of size 256 padded with 0 have been
// observed (QTBUG-84455).
size += 2;
QVarLengthArray<unsigned char> buffer(static_cast<int>(size));
std::fill(buffer.data(), buffer.data() + size, 0u);
if (RegQueryValueEx(m_key, subKeyC, nullptr, &type, buffer.data(), &size) == ERROR_SUCCESS)
result = QString::fromWCharArray(reinterpret_cast<const wchar_t *>(buffer.constData()));
return result;
}
QPair<DWORD, bool> QWinRegistryKey::dwordValue(QStringView subKey) const
{
if (!isValid())
return qMakePair(0, false);
DWORD type;
auto subKeyC = reinterpret_cast<const wchar_t *>(subKey.utf16());
if (RegQueryValueEx(m_key, subKeyC, nullptr, &type, nullptr, nullptr) != ERROR_SUCCESS
|| type != REG_DWORD) {
return qMakePair(0, false);
}
DWORD value = 0;
DWORD size = sizeof(value);
const bool ok =
RegQueryValueEx(m_key, subKeyC, nullptr, nullptr,
reinterpret_cast<unsigned char *>(&value), &size) == ERROR_SUCCESS;
return qMakePair(value, ok);
}
QT_END_NAMESPACE
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