1 files changed, 82 insertions, 0 deletions
diff --git a/include/tools/zcodec.hxx b/include/tools/zcodec.hxx
new file mode 100644
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--- /dev/null
+++ b/include/tools/zcodec.hxx
@@ -0,0 +1,82 @@
+/* -*- 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_TOOLS_ZCODEC_HXX
+#define INCLUDED_TOOLS_ZCODEC_HXX
+
+#include <tools/toolsdllapi.h>
+#include <tools/long.hxx>
+#include <memory>
+
+#define ZCODEC_NO_COMPRESSION       0
+#define ZCODEC_DEFAULT_COMPRESSION  6
+
+class SvStream;
+
+// The overall client call protocol is one of:
+// * BeginCompression, Compress, EndCompression
+// * BeginCompression, Decompress, EndCompression
+// * BeginCompression, Write*, EndCompression
+// * BeginCompression, Read*, EndCompression
+// * BeginCompression, ReadAsynchron*, EndCompression
+class SAL_WARN_UNUSED TOOLS_DLLPUBLIC ZCodec
+{
+    enum State { STATE_INIT, STATE_DECOMPRESS, STATE_COMPRESS };
+    State           meState;
+    bool            mbStatus;
+    bool            mbFinish;
+    std::unique_ptr<sal_uInt8[]> mpInBuf;
+    size_t          mnInBufSize;
+    size_t          mnInToRead;
+    SvStream*       mpOStm;
+    std::unique_ptr<sal_uInt8[]> mpOutBuf;
+    size_t          mnOutBufSize;
+
+    int             mnCompressLevel;
+    bool            mbGzLib;
+    void*           mpsC_Stream;
+
+    void            InitCompress();
+    void            InitDecompress(SvStream & inStream);
+    void            ImplWriteBack();
+
+public:
+                    ZCodec( size_t nInBufSize = 32768, size_t nOutBufSize = 32768 );
+                    ~ZCodec();
+    /**
+     * @brief Checks whether a stream is Z compressed
+     *
+     * @param rIStm the stream to check
+     */
+    static bool IsZCompressed( SvStream& rIStm );
+
+    void            BeginCompression( int nCompressLevel = ZCODEC_DEFAULT_COMPRESSION, bool gzLib = false );
+    tools::Long            EndCompression();
+
+    void            Compress( SvStream& rIStm, SvStream& rOStm );
+    tools::Long            Decompress( SvStream& rIStm, SvStream& rOStm );
+    bool            AttemptDecompression( SvStream& rIStm, SvStream& rOStm );
+
+    void            Write( SvStream& rOStm, const sal_uInt8* pData, sal_uInt32 nSize );
+    tools::Long            Read( SvStream& rIStm, sal_uInt8* pData, sal_uInt32 nSize );
+};
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */