chore: import upstream snapshot with attribution

src/modules/FileLocksmith/FileLocksmithExt/ClassFactory.cpp

@@ -0,0 +1,80 @@
+#include "pch.h"
+
+#include "ClassFactory.h"
+#include "ExplorerCommand.h"
+#include "dllmain.h"
+
+// Class ctor/dtors
+
+ClassFactory::ClassFactory(_In_ REFCLSID clsid) :
+    m_ref_count(1),
+    m_clsid(clsid)
+{
+    ++globals::ref_count;
+}
+
+ClassFactory::~ClassFactory()
+{
+    --globals::ref_count;
+}
+
+// Implementations of inherited IUnknown methods
+
+IFACEMETHODIMP ClassFactory::QueryInterface(REFIID riid, void** ppv)
+{
+    static const QITAB qit[] = {
+        QITABENT(ClassFactory, IClassFactory),
+        { 0, 0 },
+    };
+    return QISearch(this, qit, riid, ppv);
+}
+
+IFACEMETHODIMP_(ULONG) ClassFactory::AddRef()
+{
+    return ++m_ref_count;
+}
+
+IFACEMETHODIMP_(ULONG) ClassFactory::Release()
+{
+    auto result = --m_ref_count;
+    if (result == 0)
+    {
+        delete this;
+    }
+    return result;
+}
+
+// Implementations of inherited IClassFactory methods
+
+IFACEMETHODIMP ClassFactory::CreateInstance(IUnknown* pUnkOuter, REFIID riid, void** ppvObject)
+{
+    *ppvObject = NULL;
+    HRESULT hr;
+    if (pUnkOuter)
+    {
+        hr = CLASS_E_NOAGGREGATION;
+    }
+    else if (m_clsid == __uuidof(ExplorerCommand))
+    {
+        hr = ExplorerCommand::s_CreateInstance(pUnkOuter, riid, ppvObject);
+    }
+    else
+    {
+        hr = CLASS_E_CLASSNOTAVAILABLE;
+    }
+    return hr;
+}
+
+IFACEMETHODIMP ClassFactory::LockServer(BOOL fLock)
+{
+    if (fLock)
+    {
+        ++globals::ref_count;
+    }
+    else
+    {
+        --globals::ref_count;
+    }
+
+    return S_OK;
+}