1 files changed, 74 insertions, 0 deletions
diff --git a/include/oox/ole/vbainputstream.hxx b/include/oox/ole/vbainputstream.hxx
new file mode 100644
index 000000000..4f2f78d81
--- /dev/null
+++ b/include/oox/ole/vbainputstream.hxx
@@ -0,0 +1,74 @@
+/* -*- 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_OOX_OLE_VBAINPUTSTREAM_HXX
+#define INCLUDED_OOX_OLE_VBAINPUTSTREAM_HXX
+
+#include <cstddef>
+#include <vector>
+
+#include <oox/helper/binaryinputstream.hxx>
+#include <oox/helper/binarystreambase.hxx>
+#include <sal/types.h>
+
+namespace oox::ole {
+
+
+/** A non-seekable input stream that implements run-length decompression. */
+class VbaInputStream final : public BinaryInputStream
+{
+public:
+    explicit            VbaInputStream( BinaryInputStream& rInStrm );
+
+    /** Returns -1, stream size is not determinable. */
+    virtual sal_Int64   size() const override;
+    /** Returns -1, stream position is not tracked. */
+    virtual sal_Int64   tell() const override;
+    /** Does nothing, stream is not seekable. */
+    virtual void        seek( sal_Int64 nPos ) override;
+    /** Closes the input stream but not the wrapped stream. */
+    virtual void        close() override;
+
+    /** Reads nBytes bytes to the passed sequence.
+        @return  Number of bytes really read. */
+    virtual sal_Int32   readData( StreamDataSequence& orData, sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+    /** Reads nBytes bytes to the (existing) buffer opMem.
+        @return  Number of bytes really read. */
+    virtual sal_Int32   readMemory( void* opMem, sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+    /** Seeks the stream forward by the passed number of bytes. */
+    virtual void        skip( sal_Int32 nBytes, size_t nAtomSize = 1 ) override;
+
+private:
+    /** If no data left in chunk buffer, reads the next chunk from stream. */
+    bool                updateChunk();
+
+private:
+    typedef ::std::vector< sal_uInt8 > ChunkBuffer;
+
+    BinaryInputStream*  mpInStrm;
+    ChunkBuffer         maChunk;
+    size_t              mnChunkPos;
+};
+
+
+} // namespace oox::ole
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */