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// Copyright (C) 2021 The Qt Company Ltd.
// Copyright (C) 2019 Luxoft Sweden AB
// Copyright (C) 2018 Pelagicore AG
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#pragma once
#include <QtCore/qglobal.h>
#include <utility>
#include <QtAppManCommon/global.h>
QT_FORWARD_DECLARE_CLASS(QLibrary)
#if defined(_MSC_VER) && (_MSC_VER <= 1800)
namespace std {
template <typename T> static typename std::add_rvalue_reference<T>::type declval();
}
#endif
QT_BEGIN_NAMESPACE_AM
namespace Cryptography {
template <typename R> class LibCryptoResult
{
public:
LibCryptoResult(R r) : m_r(r) { }
LibCryptoResult(const LibCryptoResult &other) { m_r = other.m_r; }
LibCryptoResult operator=(const LibCryptoResult &that) { m_r = that.m_r; return *this; }
~LibCryptoResult() { }
R result() { return m_r; }
private:
R m_r;
};
template<> class LibCryptoResult<void>
{
public:
LibCryptoResult() { }
void result() { }
};
class LibCryptoFunctionBase
{
public:
static bool initialize(bool loadOpenSsl3LegacyProvider);
static inline bool isOpenSSL11() { return s_isOpenSSL11; }
static inline bool isOpenSSL30() { return s_isOpenSSL30; }
protected:
LibCryptoFunctionBase(const char *symbol);
void resolve();
const char *m_symbol;
void (*m_functionPtr)() = nullptr;
private:
static QLibrary *s_library;
static bool s_isOpenSSL11;
static bool s_isOpenSSL30;
bool m_tried = false;
};
template <typename F>
class LibCryptoFunction : protected LibCryptoFunctionBase
{
template <typename Result, typename ...Args> static Result returnType(Result (*)(Args...));
typedef decltype(returnType(std::declval<F>())) R;
LibCryptoResult<R> m_defaultResult;
public:
LibCryptoFunction(const char *symbol)
: LibCryptoFunctionBase(symbol)
{ }
LibCryptoFunction(const char *symbol, const LibCryptoResult<R> &defaultResult)
: LibCryptoFunctionBase(symbol)
, m_defaultResult(defaultResult)
{ }
F functionPointer()
{
if (Q_UNLIKELY(!m_functionPtr))
resolve();
return reinterpret_cast<F>(m_functionPtr);
}
template <typename ...Args>
R operator()(Args &&...args)
{
if (Q_UNLIKELY(!functionPointer()))
return m_defaultResult.result();
return std::forward<F>(reinterpret_cast<F>(m_functionPtr))(std::forward<Args>(args)...);
}
};
#define AM_LIBCRYPTO_FUNCTION(f, typeof_f, ...) Cryptography::LibCryptoFunction<typeof_f> am_ ## f(#f, ##__VA_ARGS__)
}
QT_END_NAMESPACE_AM
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