1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
2 /*
3 * This file is part of the LibreOffice project.
4 *
5 * This Source Code Form is subject to the terms of the Mozilla Public
6 * License, v. 2.0. If a copy of the MPL was not distributed with this
7 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
8 *
9 * This file incorporates work covered by the following license notice:
10 *
11 * Licensed to the Apache Software Foundation (ASF) under one or more
12 * contributor license agreements. See the NOTICE file distributed
13 * with this work for additional information regarding copyright
14 * ownership. The ASF licenses this file to you under the Apache
15 * License, Version 2.0 (the "License"); you may not use this file
16 * except in compliance with the License. You may obtain a copy of
17 * the License at http://www.apache.org/licenses/LICENSE-2.0 .
18 */
19
20
21 #include <tools/stream.hxx>
22 #include <tools/zcodec.hxx>
23 #include "codec.hxx"
24 #include <memory>
25
26
GalleryCodec(SvStream & rIOStm)27 GalleryCodec::GalleryCodec( SvStream& rIOStm ) :
28 rStm( rIOStm )
29 {
30 }
31
~GalleryCodec()32 GalleryCodec::~GalleryCodec()
33 {
34 }
35
IsCoded(SvStream & rStm,sal_uInt32 & rVersion)36 bool GalleryCodec::IsCoded( SvStream& rStm, sal_uInt32& rVersion )
37 {
38 const sal_uInt64 nPos = rStm.Tell();
39 bool bRet;
40 sal_uInt8 cByte1, cByte2, cByte3, cByte4, cByte5, cByte6;
41
42 rStm.ReadUChar( cByte1 ).ReadUChar( cByte2 ).ReadUChar( cByte3 ).ReadUChar( cByte4 ).ReadUChar( cByte5 ).ReadUChar( cByte6 );
43
44 if ( cByte1 == 'S' && cByte2 == 'V' && cByte3 == 'R' && cByte4 == 'L' && cByte5 == 'E' && ( cByte6 == '1' || cByte6 == '2' ) )
45 {
46 rVersion = ( ( cByte6 == '1' ) ? 1 : 2 );
47 bRet = true;
48 }
49 else
50 {
51 rVersion = 0;
52 bRet = false;
53 }
54
55 rStm.Seek( nPos );
56
57 return bRet;
58 }
59
Write(SvStream & rStmToWrite)60 void GalleryCodec::Write( SvStream& rStmToWrite )
61 {
62 sal_uInt32 nPos, nCompSize;
63
64 const sal_uInt32 nSize = rStmToWrite.TellEnd();
65 rStmToWrite.Seek( 0 );
66
67 rStm.WriteChar( 'S' ).WriteChar( 'V' ).WriteChar( 'R' ).WriteChar( 'L' ).WriteChar( 'E' ).WriteChar( '2' );
68 rStm.WriteUInt32( nSize );
69
70 nPos = rStm.Tell();
71 rStm.SeekRel( 4 );
72
73 ZCodec aCodec;
74 aCodec.BeginCompression();
75 aCodec.Compress( rStmToWrite, rStm );
76 aCodec.EndCompression();
77
78 nCompSize = rStm.Tell() - nPos - 4;
79 rStm.Seek( nPos );
80 rStm.WriteUInt32( nCompSize );
81 rStm.Seek( STREAM_SEEK_TO_END );
82 }
83
Read(SvStream & rStmToRead)84 void GalleryCodec::Read( SvStream& rStmToRead )
85 {
86 sal_uInt32 nVersion = 0;
87
88 if( !IsCoded( rStm, nVersion ) )
89 return;
90
91 sal_uInt32 nCompressedSize, nUnCompressedSize;
92
93 rStm.SeekRel( 6 );
94 rStm.ReadUInt32( nUnCompressedSize ).ReadUInt32( nCompressedSize );
95
96 // decompress
97 if( 1 == nVersion )
98 {
99 std::unique_ptr<sal_uInt8[]> pCompressedBuffer(new sal_uInt8[ nCompressedSize ]);
100 rStm.ReadBytes(pCompressedBuffer.get(), nCompressedSize);
101 sal_uInt8* pInBuf = pCompressedBuffer.get();
102 std::unique_ptr<sal_uInt8[]> pOutBuf(new sal_uInt8[ nUnCompressedSize ]);
103 sal_uInt8* pTmpBuf = pOutBuf.get();
104 sal_uInt8* pLast = pOutBuf.get() + nUnCompressedSize - 1;
105 sal_uIntPtr nIndex = 0, nCountByte, nRunByte;
106 bool bEndDecoding = false;
107
108 do
109 {
110 nCountByte = *pInBuf++;
111
112 if ( !nCountByte )
113 {
114 nRunByte = *pInBuf++;
115
116 if ( nRunByte > 2 )
117 {
118 // filling absolutely
119 memcpy( &pTmpBuf[ nIndex ], pInBuf, nRunByte );
120 pInBuf += nRunByte;
121 nIndex += nRunByte;
122
123 // note WORD alignment
124 if ( nRunByte & 1 )
125 pInBuf++;
126 }
127 else if ( nRunByte == 1 ) // End of the image
128 bEndDecoding = true;
129 }
130 else
131 {
132 const sal_uInt8 cVal = *pInBuf++;
133
134 memset( &pTmpBuf[ nIndex ], cVal, nCountByte );
135 nIndex += nCountByte;
136 }
137 }
138 while ( !bEndDecoding && ( pTmpBuf <= pLast ) );
139
140 rStmToRead.WriteBytes(pOutBuf.get(), nUnCompressedSize);
141 }
142 else if( 2 == nVersion )
143 {
144 ZCodec aCodec;
145
146 aCodec.BeginCompression();
147 aCodec.Decompress( rStm, rStmToRead );
148 aCodec.EndCompression();
149 }
150 }
151
152 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */
153