Adding upstream version 4:24.2.0.upstream/4%24.2.0

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

9 files changed, 670 insertions, 0 deletions

diff --git a/include/systools/curlinit.hxx b/include/systools/curlinit.hxx
new file mode 100644
index 0000000000..d03c620a3c
--- /dev/null
+++ b/include/systools/curlinit.hxx
@@ -0,0 +1,82 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include <curl/curl.h>
+
+#include <officecfg/Office/Security.hxx>
+
+#if defined(LINUX) && !defined(SYSTEM_CURL)
+#include <com/sun/star/uno/RuntimeException.hpp>
+
+#define LO_CURL_NEEDS_CA_BUNDLE
+#include "opensslinit.hxx"
+#undef LO_CURL_NEEDS_CA_BUNDLE
+#endif
+
+#include <rtl/string.hxx>
+#include <sal/log.hxx>
+
+#include <config_version.h>
+
+static void InitCurl_easy(CURL* const pCURL)
+{
+    CURLcode rc;
+    (void)rc;
+
+#if defined(LINUX) && !defined(SYSTEM_CURL)
+    char const* const path = GetCABundleFile();
+    rc = curl_easy_setopt(pCURL, CURLOPT_CAINFO, path);
+    if (rc != CURLE_OK) // only if OOM?
+    {
+        throw css::uno::RuntimeException("CURLOPT_CAINFO failed");
+    }
+#endif
+
+    if (!officecfg::Office::Security::Net::AllowInsecureProtocols::get())
+    {
+        rc = curl_easy_setopt(pCURL, CURLOPT_SSLVERSION, CURL_SSLVERSION_TLSv1_2);
+        assert(rc == CURLE_OK);
+        rc = curl_easy_setopt(pCURL, CURLOPT_PROXY_SSLVERSION, CURL_SSLVERSION_TLSv1_2);
+        assert(rc == CURLE_OK);
+#if (LIBCURL_VERSION_MAJOR > 7) || (LIBCURL_VERSION_MAJOR == 7 && LIBCURL_VERSION_MINOR >= 85)
+        rc = curl_easy_setopt(pCURL, CURLOPT_PROTOCOLS_STR, "https");
+        assert(rc == CURLE_OK);
+        rc = curl_easy_setopt(pCURL, CURLOPT_REDIR_PROTOCOLS_STR, "https");
+        assert(rc == CURLE_OK);
+#else
+        rc = curl_easy_setopt(pCURL, CURLOPT_PROTOCOLS, CURLPROTO_HTTPS);
+        assert(rc == CURLE_OK);
+        rc = curl_easy_setopt(pCURL, CURLOPT_REDIR_PROTOCOLS, CURLPROTO_HTTPS);
+        assert(rc == CURLE_OK);
+#endif
+    }
+
+    curl_version_info_data const* const pVersion(curl_version_info(CURLVERSION_NOW));
+    assert(pVersion);
+    SAL_INFO("ucb.ucp.webdav.curl",
+             "curl version: " << pVersion->version << " " << pVersion->host
+                              << " features: " << ::std::hex << pVersion->features << " ssl: "
+                              << pVersion->ssl_version << " libz: " << pVersion->libz_version);
+    // Make sure a User-Agent header is always included, as at least
+    // en.wikipedia.org:80 forces back 403 "Scripts should use an informative
+    // User-Agent string with contact information, or they may be IP-blocked
+    // without notice" otherwise:
+    OString const useragent(
+        OString::Concat("LibreOffice " LIBO_VERSION_DOTTED " denylistedbackend/")
+        + pVersion->version + " " + pVersion->ssl_version);
+    // looks like an explicit "User-Agent" header in CURLOPT_HTTPHEADER
+    // will override CURLOPT_USERAGENT, see Curl_http_useragent(), so no need
+    // to check anything here
+    rc = curl_easy_setopt(pCURL, CURLOPT_USERAGENT, useragent.getStr());
+    assert(rc == CURLE_OK);
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/include/systools/opensslinit.hxx b/include/systools/opensslinit.hxx
new file mode 100644
index 0000000000..04f38faa08
--- /dev/null
+++ b/include/systools/opensslinit.hxx
@@ -0,0 +1,43 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include <config_crypto.h>
+
+// Also include/systools/curlinit.hxx needs GetCABundleFile() if
+// !defined(SYSTEM_CURL) it defines LO_CURL_NEEDS_CA_BUNDLE.
+#if defined(LINUX) && (!defined(SYSTEM_OPENSSL) || defined(LO_CURL_NEEDS_CA_BUNDLE))
+#include <com/sun/star/uno/RuntimeException.hpp>
+
+#include <unistd.h>
+
+static char const* GetCABundleFile()
+{
+    // try system ones first; inspired by:
+    // https://www.happyassassin.net/posts/2015/01/12/a-note-about-ssltls-trusted-certificate-stores-and-platforms/
+    auto const candidates = {
+        "/etc/pki/tls/certs/ca-bundle.crt",
+        "/etc/pki/tls/certs/ca-bundle.trust.crt",
+        "/etc/ssl/certs/ca-certificates.crt",
+        "/var/lib/ca-certificates/ca-bundle.pem",
+    };
+    for (char const* const candidate : candidates)
+    {
+        if (access(candidate, R_OK) == 0)
+        {
+            return candidate;
+        }
+    }
+
+    throw css::uno::RuntimeException("no OpenSSL CA certificate bundle found");
+}
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/include/systools/win32/comtools.hxx b/include/systools/win32/comtools.hxx
new file mode 100644
index 0000000000..1d618051d2
--- /dev/null
+++ b/include/systools/win32/comtools.hxx
@@ -0,0 +1,267 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <string>
+#include <string_view>
+#include <stdexcept>
+#include <type_traits>
+#include <utility>
+
+#include <prewin.h>
+#include <objbase.h>
+#include <postwin.h>
+
+namespace sal::systools
+{
+    /* Simple exception class for propagating COM errors */
+    class ComError : public std::runtime_error
+    {
+    public:
+        ComError(const std::string& message, HRESULT hr) :
+            std::runtime_error(message),
+            hr_(hr)
+        {}
+
+        HRESULT GetHresult() const { return hr_; }
+
+    private:
+        HRESULT hr_;
+    };
+
+    /* Convert failed HRESULT to thrown ComError */
+    inline void ThrowIfFailed(HRESULT hr, std::string_view msg)
+    {
+        if (FAILED(hr))
+            throw ComError(std::string(msg), hr);
+    }
+
+    /* A guard class to call CoInitializeEx/CoUninitialize in proper pairs
+     * See also: o3tl::safeCoInitializeEx doing dangerous re-initialization
+     */
+    class CoInitializeGuard
+    {
+    public:
+        enum class WhenFailed
+        {
+            NoThrow, // do not throw
+            Throw, // throw on failure
+            Abort, // std::abort on failure
+        };
+        explicit CoInitializeGuard(DWORD dwCoInit, bool failChangeMode = false,
+                                   WhenFailed whenFailed = WhenFailed::Throw)
+        {
+            HRESULT hr = ::CoInitializeEx(nullptr, dwCoInit);
+            if (whenFailed != WhenFailed::NoThrow && FAILED(hr)
+                && (failChangeMode || hr != RPC_E_CHANGED_MODE))
+            {
+                if (whenFailed == WhenFailed::Throw)
+                    throw ComError("CoInitializeEx failed", hr);
+                else // if (whenFailed == Abort)
+                    std::abort();
+            }
+            mbUninit = SUCCEEDED(hr);
+        }
+        CoInitializeGuard(const CoInitializeGuard&) = delete; // non-construction-copyable
+        void operator=(const CoInitializeGuard&) = delete; // non-copyable
+        ~CoInitializeGuard()
+        {
+            if (mbUninit)
+                ::CoUninitialize();
+        }
+
+    private:
+        bool mbUninit;
+    };
+
+    struct COM_QUERY_TAG {} constexpr COM_QUERY;
+    struct COM_QUERY_THROW_TAG {} constexpr COM_QUERY_THROW;
+    template <typename TAG>
+    constexpr bool is_COM_query_tag
+        = std::is_same_v<TAG, COM_QUERY_TAG> || std::is_same_v<TAG, COM_QUERY_THROW_TAG>;
+
+    /* A simple COM smart pointer template */
+    template <typename T>
+    class COMReference
+    {
+    public:
+        /* Explicitly controllable whether AddRef will be called or not */
+        COMReference(T* comptr = nullptr, bool bAddRef = true) :
+            com_ptr_(comptr)
+        {
+            if (bAddRef)
+                addRef(com_ptr_);
+        }
+
+        COMReference(const COMReference<T>& other) :
+            COMReference(other.com_ptr_)
+        {
+        }
+
+        COMReference(COMReference<T>&& other) :
+            COMReference(std::exchange(other.com_ptr_, nullptr), false)
+        {
+        }
+
+        // Query from IUnknown*, using COM_QUERY or COM_QUERY_THROW tags
+        template <typename T2, typename TAG>
+        COMReference(const COMReference<T2>& p, TAG t)
+            : COMReference(p.template QueryInterface<T>(t))
+        {
+        }
+
+        // Using CoCreateInstance
+        COMReference(REFCLSID clsid, IUnknown* pOuter = nullptr, DWORD nCtx = CLSCTX_ALL)
+            : com_ptr_(nullptr)
+        {
+            ThrowIfFailed(CoCreateInstance(clsid, pOuter, nCtx), "CoCreateInstance failed");
+        }
+
+        COMReference<T>& operator=(const COMReference<T>& other)
+        {
+            return operator=(other.com_ptr_);
+        }
+
+        COMReference<T>& operator=(COMReference<T>&& other)
+        {
+            if (com_ptr_ != other.com_ptr_)
+            {
+                clear();
+                std::swap(com_ptr_, other.com_ptr_);
+            }
+            return *this;
+        }
+
+        COMReference<T>& operator=(T* comptr)
+        {
+            assign(comptr);
+            return *this;
+        }
+
+        ~COMReference() { release(com_ptr_); }
+
+        template <typename T2, typename TAG, std::enable_if_t<is_COM_query_tag<TAG>, int> = 0>
+        COMReference<T2> QueryInterface(TAG) const
+        {
+            T2* ip = nullptr;
+            HRESULT hr = E_POINTER;
+            if (com_ptr_)
+                hr = com_ptr_->QueryInterface(&ip);
+
+            if constexpr (std::is_same_v<TAG, COM_QUERY_THROW_TAG>)
+                ThrowIfFailed(hr, "QueryInterface failed");
+
+            return { ip, false };
+        }
+
+        template <typename T2, typename TAG>
+        COMReference<T>& set(const COMReference<T2>& p, TAG t)
+        {
+            return operator=(p.template QueryInterface<T>(t));
+        }
+
+        HRESULT CoCreateInstance(REFCLSID clsid, IUnknown* pOuter = nullptr,
+                                 DWORD nCtx = CLSCTX_ALL)
+        {
+            T* ip;
+            HRESULT hr = ::CoCreateInstance(clsid, pOuter, nCtx, IID_PPV_ARGS(&ip));
+            if (SUCCEEDED(hr))
+                release(std::exchange(com_ptr_, ip));
+            return hr;
+        }
+
+        HRESULT CoGetClassObject(REFCLSID clsid, DWORD nCtx = CLSCTX_ALL)
+        {
+            T* ip;
+            HRESULT hr = ::CoGetClassObject(clsid, nCtx, nullptr, IID_PPV_ARGS(&ip));
+            if (SUCCEEDED(hr))
+                release(std::exchange(com_ptr_, ip));
+            return hr;
+        }
+
+        T* operator->() const { return com_ptr_; }
+
+        T& operator*() const { return *com_ptr_; }
+
+        /* Necessary for assigning com_ptr_ from functions like
+           CoCreateInstance which require a 'void**' */
+        T** operator&()
+        {
+            clear();
+            return &com_ptr_;
+        }
+
+        T* get() const { return com_ptr_; }
+        operator T* () const { return get(); }
+
+        void clear() { assign(nullptr); }
+
+        bool is() const { return (com_ptr_ != nullptr); }
+        operator bool() const { return is(); }
+
+    private:
+        static void addRef(T* ptr)
+        {
+            if (ptr)
+                ptr->AddRef();
+        }
+
+        static void release(T* ptr)
+        {
+            if (ptr)
+                ptr->Release();
+        }
+
+        void assign(T* ptr)
+        {
+            if (com_ptr_ == ptr)
+                return;
+            addRef(ptr);
+            release(std::exchange(com_ptr_, ptr));
+        }
+
+        T* com_ptr_;
+    };
+
+    // A class to use with functions taking an out pointer argument,
+    // that needs to be freed with CoTaskMemFree - like SHGetKnownFolderPath
+    template <typename T> class CoTaskMemAllocated
+    {
+    public:
+        ~CoTaskMemAllocated() { CoTaskMemFree(m_pv); }
+
+        T** operator&()
+        {
+            CoTaskMemFree(std::exchange(m_pv, nullptr));
+            return &m_pv;
+        };
+
+        operator T*() { return m_pv; }
+
+    private:
+        T* m_pv = nullptr;
+    };
+
+} // sal::systools
+
+/* Typedefs for some popular COM interfaces */
+typedef sal::systools::COMReference<IDataObject> IDataObjectPtr;
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/systools/win32/odbccp32.hxx b/include/systools/win32/odbccp32.hxx
new file mode 100644
index 0000000000..bbfaf9eecb
--- /dev/null
+++ b/include/systools/win32/odbccp32.hxx
@@ -0,0 +1,54 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include <sal/config.h>
+
+#include <prewin.h>
+#include <postwin.h>
+
+namespace sal::systools
+{
+// Linking to odbccp32 requires also legacy_stdio_definitions; and that breaks
+// in some configurations, with make error 139. Load it dynamically instead.
+class odbccp32
+{
+public:
+    odbccp32()
+        : m_hDLL(LoadLibraryW(L"odbccp32.dll"))
+    {
+    }
+    ~odbccp32() { FreeLibrary(m_hDLL); }
+
+    bool SQLGetInstalledDrivers(LPWSTR sBuf, WORD nBufSize) const
+    {
+        using proc_t = BOOL __stdcall(LPWSTR, WORD, WORD*);
+        return Invoke<proc_t>("SQLGetInstalledDriversW", sBuf, nBufSize, nullptr);
+    }
+
+    bool SQLManageDataSources(HWND hwndParent)
+    {
+        using proc_t = BOOL __stdcall(HWND);
+        return Invoke<proc_t>("SQLManageDataSources", hwndParent);
+    }
+
+private:
+    template <typename proc_t, typename... Args> bool Invoke(const char* func, Args... args) const
+    {
+        if (auto pFunc = reinterpret_cast<proc_t*>(GetProcAddress(m_hDLL, func)))
+            return pFunc(args...);
+        return false;
+    }
+
+    HMODULE m_hDLL;
+};
+} // sal::systools
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/include/systools/win32/oleauto.hxx b/include/systools/win32/oleauto.hxx
new file mode 100644
index 0000000000..c01ac1225f
--- /dev/null
+++ b/include/systools/win32/oleauto.hxx
@@ -0,0 +1,84 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#pragma once
+
+#include <cassert>
+#include <string_view>
+#include <utility>
+
+#include <prewin.h>
+#include <oleauto.h>
+#include <postwin.h>
+
+#include <o3tl/char16_t2wchar_t.hxx>
+
+namespace sal::systools
+{
+// BSTR safe wrapper
+class BStr
+{
+public:
+    BStr() = default;
+    BStr(std::u16string_view sv)
+        : m_Str(::SysAllocStringLen(o3tl::toW(sv.data()), sv.length()))
+    {
+    }
+    BStr(const BStr& src)
+        : BStr(std::u16string_view(src))
+    {
+    }
+    BStr(BStr&& src)
+        : m_Str(std::exchange(src.m_Str, nullptr))
+    {
+    }
+    ~BStr() { ::SysFreeString(m_Str); }
+    BStr& operator=(std::u16string_view sv)
+    {
+        ::SysFreeString(
+            std::exchange(m_Str, ::SysAllocStringLen(o3tl::toW(sv.data()), sv.length())));
+        return *this;
+    }
+    BStr& operator=(const BStr& src)
+    {
+        if (&src != this)
+            operator=(std::u16string_view(src));
+        return *this;
+    }
+    BStr& operator=(BStr&& src)
+    {
+        ::SysFreeString(std::exchange(m_Str, std::exchange(src.m_Str, nullptr)));
+        return *this;
+    }
+    operator std::u16string_view() const { return { o3tl::toU(m_Str), length() }; }
+    operator BSTR() const { return m_Str; }
+    BSTR* operator&()
+    {
+        assert(!m_Str);
+        return &m_Str;
+    }
+    UINT length() const { return ::SysStringLen(m_Str); }
+
+private:
+    BSTR m_Str = nullptr;
+};
+
+} // sal::systools
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/include/systools/win32/qswin32.h b/include/systools/win32/qswin32.h
new file mode 100644
index 0000000000..8bc7cac5e8
--- /dev/null
+++ b/include/systools/win32/qswin32.h
@@ -0,0 +1,29 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_SYSTOOLS_WIN32_QSWIN32_H
+#define INCLUDED_SYSTOOLS_WIN32_QSWIN32_H
+
+#define QUICKSTART_CLASSNAME L"LO Listener Class"
+#define QUICKSTART_WINDOWNAME L"LO Listener Window"
+#define SHUTDOWN_QUICKSTART_MESSAGE L"LO KillTray"
+
+#endif // INCLUDED_SYSTOOLS_WIN32_QSWIN32_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/systools/win32/retry_if_failed.hxx b/include/systools/win32/retry_if_failed.hxx
new file mode 100644
index 0000000000..1372843ab8
--- /dev/null
+++ b/include/systools/win32/retry_if_failed.hxx
@@ -0,0 +1,38 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include <type_traits>
+#include <systools/win32/uwinapi.h>
+
+#pragma comment(lib, "Kernel32.lib") // for Sleep
+
+namespace sal::systools
+{
+// Some system calls (e.g., clipboard access functions) may fail first time, because the resource
+// may only be accessed by one process at a time. This function allows to retry failed call up to
+// specified number of times with a specified timeout (in ms), until the call succeeds or the limit
+// of attempts is exceeded.
+// Usage:
+//     HRESULT hr = sal::systools::RetryIfFailed(10, 100, []{ return OleFlushClipboard(); });
+template <typename Func>
+std::enable_if_t<std::is_same_v<std::invoke_result_t<Func>, HRESULT>, HRESULT>
+RetryIfFailed(unsigned times, unsigned msTimeout, Func func)
+{
+    for (unsigned i = 0;; ++i)
+    {
+        if (HRESULT hr = func(); SUCCEEDED(hr) || i >= times)
+            return hr;
+        Sleep(msTimeout);
+    }
+}
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */
diff --git a/include/systools/win32/uwinapi.h b/include/systools/win32/uwinapi.h
new file mode 100644
index 0000000000..501c9aa38e
--- /dev/null
+++ b/include/systools/win32/uwinapi.h
@@ -0,0 +1,41 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_SYSTOOLS_WIN32_UWINAPI_H
+#define INCLUDED_SYSTOOLS_WIN32_UWINAPI_H
+
+#include <prewin.h>
+#include <postwin.h>
+
+#ifdef __cplusplus
+
+inline bool IsValidHandle(HANDLE handle)
+{
+    return handle != INVALID_HANDLE_VALUE && handle != nullptr;
+}
+
+#else /* __cplusplus */
+
+#define IsValidHandle(Handle) ((DWORD_PTR)(Handle) + 1 > 1)
+
+#endif /* __cplusplus */
+
+#endif // INCLUDED_SYSTOOLS_WIN32_UWINAPI_H
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */
diff --git a/include/systools/win32/winstoreutil.hxx b/include/systools/win32/winstoreutil.hxx
new file mode 100644
index 0000000000..aa0a70e644
--- /dev/null
+++ b/include/systools/win32/winstoreutil.hxx
@@ -0,0 +1,32 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4; fill-column: 100 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#pragma once
+
+#include <sal/config.h>
+
+#include <prewin.h>
+#include <postwin.h>
+
+namespace sal::systools
+{
+// Returns true if the current process is run as a Windows store app, which has some specifics
+inline bool IsStorePackagedApp()
+{
+    // GetCurrentPackageFullName is only available since Windows 8
+    HMODULE hDll = GetModuleHandleW(L"kernel32.dll");
+    using Func_t = LONG WINAPI(UINT32*, PWSTR);
+    if (auto pFunc = reinterpret_cast<Func_t*>(GetProcAddress(hDll, "GetCurrentPackageFullName")))
+        if (UINT32 size = 0; pFunc(&size, nullptr) == ERROR_INSUFFICIENT_BUFFER)
+            return true;
+    return false;
+}
+} // sal::systools
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab cinoptions=b1,g0,N-s cinkeys+=0=break: */