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// Copyright (C) 2016 The Qt Company Ltd.
// Copyright (c) 2007-2008, Apple, Inc.
// SPDX-License-Identifier: BSD-3-Clause
// Qt-Security score:significant reason:default
#include "qcocoaintrospection.h"
QT_BEGIN_NAMESPACE
void qt_cocoa_change_implementation(Class baseClass, SEL originalSel, Class proxyClass, SEL replacementSel, SEL backupSel)
{
// The following code replaces the _implementation_ for the selector we want to hack
// (originalSel) with the implementation found in proxyClass. Then it creates
// a new 'backup' method inside baseClass containing the old, original,
// implementation (fakeSel). You can let the proxy implementation of originalSel
// call fakeSel if needed (similar approach to calling a super class implementation).
// fakeSel must also be implemented in proxyClass, as the signature is used
// as template for the method one we add into baseClass.
// NB: You will typically never create any instances of proxyClass; we use it
// only for stealing its contents and put it into baseClass.
if (!replacementSel)
replacementSel = originalSel;
Method originalMethod = class_getInstanceMethod(baseClass, originalSel);
Method replacementMethod = class_getInstanceMethod(proxyClass, replacementSel);
IMP originalImp = method_setImplementation(originalMethod, method_getImplementation(replacementMethod));
if (backupSel) {
Method backupMethod = class_getInstanceMethod(proxyClass, backupSel);
class_addMethod(baseClass, backupSel, originalImp, method_getTypeEncoding(backupMethod));
}
}
void qt_cocoa_change_back_implementation(Class baseClass, SEL originalSel, SEL backupSel)
{
Method originalMethod = class_getInstanceMethod(baseClass, originalSel);
Method backupMethodInBaseClass = class_getInstanceMethod(baseClass, backupSel);
method_setImplementation(originalMethod, method_getImplementation(backupMethodInBaseClass));
}
QT_END_NAMESPACE
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