1 files changed, 167 insertions, 0 deletions
diff --git a/vcl/win/dtrans/DTransHelper.hxx b/vcl/win/dtrans/DTransHelper.hxx
new file mode 100644
index 0000000000..d8ab3349cb
--- /dev/null
+++ b/vcl/win/dtrans/DTransHelper.hxx
@@ -0,0 +1,167 @@
+/* -*- 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
+
+#if !defined WIN32_LEAN_AND_MEAN
+# define WIN32_LEAN_AND_MEAN
+#endif
+#include <windows.h>
+#include <objidl.h>
+#include "WinClip.hxx"
+
+#define AUTO_INIT                 true
+
+// a helper class to manage a global memory area, the clients can write
+// into the global memory area and extract the handle to the global mem
+// note: not thread-safe
+
+class CStgTransferHelper
+{
+public:
+    // will be thrown in case of failures
+    class CStgTransferException
+    {
+    public:
+        HRESULT m_hr;
+        explicit CStgTransferException( HRESULT hr ) : m_hr( hr ) {};
+    };
+
+public:
+    CStgTransferHelper(
+        bool bAutoInit = false,
+        HGLOBAL  hGlob = nullptr,
+        bool bDelStgOnRelease = false );
+
+    ~CStgTransferHelper( );
+
+    void write( const void* lpData, ULONG cb, ULONG* cbWritten = nullptr );
+    void read( LPVOID pv, ULONG cb, ULONG* pcbRead = nullptr );
+
+    HGLOBAL getHGlobal( ) const;
+    void    getIStream( LPSTREAM* ppStream );
+
+    void init(
+        SIZE_T newSize,
+        sal_uInt32 uiFlags = GHND,
+        bool bDelStgOnRelease = false );
+
+    void init(
+        HGLOBAL hGlob,
+        bool bDelStgOnRelease = false );
+
+    // returns the size of the managed memory
+    sal_uInt32 memSize( CLIPFORMAT cf = CF_INVALID ) const;
+
+    // free the global memory and necessary
+    // release the internal stream pointer
+    void cleanup( );
+
+private:
+    LPSTREAM m_lpStream;
+    bool m_bDelStgOnRelease;
+
+private:
+    CStgTransferHelper( const CStgTransferHelper& );
+    CStgTransferHelper& operator=( const CStgTransferHelper& );
+};
+
+// something like an auto-pointer - allows access to the memory belonging
+// to a HGLOBAL and automatically unlocks a global memory at destruction
+// time
+
+class CRawHGlobalPtr
+{
+public:
+
+    // ctor
+
+    explicit CRawHGlobalPtr( HGLOBAL hGlob ) :
+        m_hGlob( hGlob ),
+        m_bIsLocked( false ),
+        m_pGlobMem( nullptr )
+    {
+    }
+
+    // ctor
+
+    explicit CRawHGlobalPtr( const CStgTransferHelper& theHGlobalHelper ) :
+        m_hGlob( theHGlobalHelper.getHGlobal( ) ),
+        m_bIsLocked( false ),
+        m_pGlobMem( nullptr )
+    {
+    }
+
+    // dtor
+
+    ~CRawHGlobalPtr( )
+    {
+        if ( m_bIsLocked )
+            GlobalUnlock( m_hGlob );
+    }
+
+    // lock the global memory (initializes a
+    // pointer to this memory)
+
+    BOOL Lock( )
+    {
+        if ( !m_bIsLocked && ( nullptr != m_hGlob ) )
+        {
+            m_pGlobMem = GlobalLock( m_hGlob );
+            m_bIsLocked = ( nullptr != m_pGlobMem );
+        }
+
+        return m_bIsLocked;
+    }
+
+    // unlock the global memory (invalidates the
+    // pointer to this memory)
+
+    BOOL Unlock( )
+    {
+        GlobalUnlock( m_hGlob );
+        m_bIsLocked = false;
+        m_pGlobMem = nullptr;
+
+        return ( NO_ERROR == GetLastError( ) );
+    }
+
+    // locks the global memory and returns a
+    // pointer to this memory
+
+    LPVOID GetMemPtr( )
+    {
+        Lock( );
+        return m_pGlobMem;
+    }
+
+    // size of mem we point to
+
+    int MemSize( ) const
+    {
+        return GlobalSize( m_hGlob );
+    }
+
+private:
+    HGLOBAL m_hGlob;
+    bool    m_bIsLocked;
+    LPVOID  m_pGlobMem;
+};
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */