1 files changed, 148 insertions, 0 deletions
diff --git a/svx/source/gallery2/codec.cxx b/svx/source/gallery2/codec.cxx
new file mode 100644
index 000000000..062c60dbe
--- /dev/null
+++ b/svx/source/gallery2/codec.cxx
@@ -0,0 +1,148 @@
+/* -*- 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 .
+ */
+
+
+#include <tools/stream.hxx>
+#include <tools/zcodec.hxx>
+#include "codec.hxx"
+#include <memory>
+
+
+GalleryCodec::GalleryCodec( SvStream& rIOStm ) :
+    rStm( rIOStm )
+{
+}
+
+bool GalleryCodec::IsCoded( SvStream& rStm, sal_uInt32& rVersion )
+{
+    const sal_uInt64   nPos = rStm.Tell();
+    bool        bRet;
+    sal_uInt8       cByte1, cByte2, cByte3, cByte4, cByte5, cByte6;
+
+    rStm.ReadUChar( cByte1 ).ReadUChar( cByte2 ).ReadUChar( cByte3 ).ReadUChar( cByte4 ).ReadUChar( cByte5 ).ReadUChar( cByte6 );
+
+    if ( cByte1 == 'S' && cByte2 == 'V' && cByte3 == 'R' && cByte4 == 'L' && cByte5 == 'E' && ( cByte6 == '1' || cByte6 == '2' ) )
+    {
+        rVersion = ( ( cByte6 == '1' ) ? 1 : 2 );
+        bRet = true;
+    }
+    else
+    {
+        rVersion = 0;
+        bRet = false;
+    }
+
+    rStm.Seek( nPos );
+
+    return bRet;
+}
+
+void GalleryCodec::Write( SvStream& rStmToWrite )
+{
+    sal_uInt32 nPos, nCompSize;
+
+    const sal_uInt32 nSize = rStmToWrite.TellEnd();
+    rStmToWrite.Seek( 0 );
+
+    rStm.WriteChar( 'S' ).WriteChar( 'V' ).WriteChar( 'R' ).WriteChar( 'L' ).WriteChar( 'E' ).WriteChar( '2' );
+    rStm.WriteUInt32( nSize );
+
+    nPos = rStm.Tell();
+    rStm.SeekRel( 4 );
+
+    ZCodec aCodec;
+    aCodec.BeginCompression();
+    aCodec.Compress( rStmToWrite, rStm );
+    aCodec.EndCompression();
+
+    nCompSize = rStm.Tell() - nPos - 4;
+    rStm.Seek( nPos );
+    rStm.WriteUInt32( nCompSize );
+    rStm.Seek( STREAM_SEEK_TO_END );
+}
+
+void GalleryCodec::Read( SvStream& rStmToRead )
+{
+    sal_uInt32 nVersion = 0;
+
+    if( !IsCoded( rStm, nVersion ) )
+        return;
+
+    sal_uInt32  nCompressedSize, nUnCompressedSize;
+
+    rStm.SeekRel( 6 );
+    rStm.ReadUInt32( nUnCompressedSize ).ReadUInt32( nCompressedSize );
+
+    // decompress
+    if( 1 == nVersion )
+    {
+        std::unique_ptr<sal_uInt8[]> pCompressedBuffer(new sal_uInt8[ nCompressedSize ]);
+        rStm.ReadBytes(pCompressedBuffer.get(), nCompressedSize);
+        sal_uInt8*  pInBuf = pCompressedBuffer.get();
+        std::unique_ptr<sal_uInt8[]> pOutBuf(new sal_uInt8[ nUnCompressedSize ]);
+        sal_uInt8*  pTmpBuf = pOutBuf.get();
+        sal_uInt8*  pLast = pOutBuf.get() + nUnCompressedSize - 1;
+        sal_uIntPtr   nIndex = 0, nCountByte, nRunByte;
+        bool    bEndDecoding = false;
+
+        do
+        {
+            nCountByte = *pInBuf++;
+
+            if ( !nCountByte )
+            {
+                nRunByte = *pInBuf++;
+
+                if ( nRunByte > 2 )
+                {
+                    // filling absolutely
+                    memcpy( &pTmpBuf[ nIndex ], pInBuf, nRunByte );
+                    pInBuf += nRunByte;
+                    nIndex += nRunByte;
+
+                    // note WORD alignment
+                    if ( nRunByte & 1 )
+                        pInBuf++;
+                }
+                else if ( nRunByte == 1 )   // End of the image
+                    bEndDecoding = true;
+            }
+            else
+            {
+                const sal_uInt8 cVal = *pInBuf++;
+
+                memset( &pTmpBuf[ nIndex ], cVal, nCountByte );
+                nIndex += nCountByte;
+            }
+        }
+        while ( !bEndDecoding && ( pTmpBuf <= pLast ) );
+
+        rStmToRead.WriteBytes(pOutBuf.get(), nUnCompressedSize);
+    }
+    else if( 2 == nVersion )
+    {
+        ZCodec aCodec;
+
+        aCodec.BeginCompression();
+        aCodec.Decompress( rStm, rStmToRead );
+        aCodec.EndCompression();
+    }
+}
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */