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// Copyright (C) 2024 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
// Qt-Security score:critical reason:execute-external-code
#include "qsymbolsresolveutils_p.h"
#include <qdebug.h>
#include <qloggingcategory.h>
QT_BEGIN_NAMESPACE
Q_STATIC_LOGGING_CATEGORY(qLcSymbolsResolver, "qt.multimedia.symbolsresolver");
bool SymbolsResolver::isLazyLoadEnabled()
{
static const bool lazyLoad =
!static_cast<bool>(qEnvironmentVariableIntValue("QT_INSTANT_LOAD_FFMPEG_STUBS"));
return lazyLoad;
}
SymbolsResolver::SymbolsResolver(const char *libLoggingName, LibraryLoader loader)
: m_libLoggingName(libLoggingName)
{
Q_ASSERT(libLoggingName);
Q_ASSERT(loader);
auto library = loader();
if (library && library->isLoaded())
m_library = std::move(library);
else
qCWarning(qLcSymbolsResolver) << "Couldn't load" << m_libLoggingName << "library";
}
SymbolsResolver::SymbolsResolver(const char *libName, const char *version,
const char *libLoggingName)
: m_libLoggingName(libLoggingName ? libLoggingName : libName)
{
Q_ASSERT(libName);
Q_ASSERT(version);
auto library = std::make_unique<QLibrary>(QString::fromLocal8Bit(libName),
QString::fromLocal8Bit(version));
if (library->load())
m_library = std::move(library);
else
qCWarning(qLcSymbolsResolver) << "Couldn't load" << m_libLoggingName << "library";
}
SymbolsResolver::~SymbolsResolver()
{
if (m_library)
m_library->unload();
}
QFunctionPointer SymbolsResolver::initOptionalFunction(const char *funcName)
{
return m_library ? m_library->resolve(funcName) : nullptr;
}
QFunctionPointer SymbolsResolver::initFunction(const char *funcName)
{
QFunctionPointer func = initOptionalFunction(funcName);
if (!func && m_library)
{
qCWarning(qLcSymbolsResolver) << "Couldn't resolve" << m_libLoggingName << "symbol" << funcName;
m_library->unload();
m_library.reset();
}
return func;
}
void SymbolsResolver::checkLibrariesLoaded(SymbolsMarker *begin, SymbolsMarker *end)
{
if (m_library) {
qCDebug(qLcSymbolsResolver) << m_libLoggingName << "symbols resolved";
} else {
const auto size = reinterpret_cast<char *>(end) - reinterpret_cast<char *>(begin);
memset(begin, 0, size);
qCWarning(qLcSymbolsResolver) << "Couldn't resolve" << m_libLoggingName << "symbols";
}
}
QT_END_NAMESPACE