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-rw-r--r--svx/source/gallery2/codec.cxx148
1 files changed, 148 insertions, 0 deletions
diff --git a/svx/source/gallery2/codec.cxx b/svx/source/gallery2/codec.cxx
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+++ b/svx/source/gallery2/codec.cxx
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+/* -*- 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: */