xref: /aoo41x/main/svx/source/gallery2/codec.cxx (revision cdf0e10c)
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27 
28 // MARKER(update_precomp.py): autogen include statement, do not remove
29 #include "precompiled_svx.hxx"
30 
31 #include <tools/stream.hxx>
32 #include <tools/zcodec.hxx>
33 #include "codec.hxx"
34 #include <tools/debug.hxx>
35 
36 // ----------------
37 // - GalleryCodec -
38 // ----------------
39 DBG_NAME(GalleryCodec)
40 
41 GalleryCodec::GalleryCodec( SvStream& rIOStm ) :
42     rStm( rIOStm )
43 {
44     DBG_CTOR(GalleryCodec,NULL);
45 
46 }
47 
48 // -----------------------------------------------------------------------------
49 
50 GalleryCodec::~GalleryCodec()
51 {
52 
53     DBG_DTOR(GalleryCodec,NULL);
54 }
55 
56 // -----------------------------------------------------------------------------
57 
58 sal_Bool GalleryCodec::IsCoded( SvStream& rStm, sal_uInt32& rVersion )
59 {
60 	const sal_uIntPtr	nPos = rStm.Tell();
61 	sal_Bool		bRet;
62 	sal_uInt8		cByte1, cByte2, cByte3, cByte4, cByte5, cByte6;
63 
64 	rStm >> cByte1 >> cByte2 >> cByte3 >> cByte4 >> cByte5 >> cByte6;
65 
66 	if ( cByte1 == 'S' && cByte2 == 'V' && cByte3 == 'R' && cByte4 == 'L' && cByte5 == 'E' && ( cByte6 == '1' || cByte6 == '2' ) )
67 	{
68         rVersion = ( ( cByte6 == '1' ) ? 1 : 2 );
69 		bRet = sal_True;
70 	}
71     else
72     {
73         rVersion = 0;
74 		bRet = sal_False;
75     }
76 
77 	rStm.Seek( nPos );
78 
79 	return bRet;
80 }
81 
82 // -----------------------------------------------------------------------------
83 
84 void GalleryCodec::Write( SvStream& rStmToWrite )
85 {
86 	sal_uInt32 nPos, nCompSize;
87 
88     rStmToWrite.Seek( STREAM_SEEK_TO_END );
89 	const sal_uInt32 nSize = rStmToWrite.Tell();
90 	rStmToWrite.Seek( 0UL );
91 
92 	rStm << 'S' << 'V' << 'R' << 'L' << 'E' << '2';
93 	rStm << nSize;
94 
95 	nPos = rStm.Tell();
96 	rStm.SeekRel( 4UL );
97 
98     ZCodec aCodec;
99     aCodec.BeginCompression();
100     aCodec.Compress( rStmToWrite, rStm );
101     aCodec.EndCompression();
102 
103 	nCompSize = rStm.Tell() - nPos - 4UL;
104 	rStm.Seek( nPos );
105 	rStm << nCompSize;
106 	rStm.Seek( STREAM_SEEK_TO_END );
107 }
108 
109 // -----------------------------------------------------------------------------
110 
111 void GalleryCodec::Read( SvStream& rStmToRead )
112 {
113 	sal_uInt32 nVersion = 0;
114 
115 	if( IsCoded( rStm, nVersion ) )
116 	{
117 		sal_uInt32	nCompressedSize, nUnCompressedSize;
118 
119 		rStm.SeekRel( 6 );
120 		rStm >> nUnCompressedSize >> nCompressedSize;
121 
122 		// decompress
123         if( 1 == nVersion )
124         {
125             sal_uInt8*   pCompressedBuffer = new sal_uInt8[ nCompressedSize ]; rStm.Read( pCompressedBuffer, nCompressedSize );
126 	        sal_uInt8*	pInBuf = pCompressedBuffer;
127 	        sal_uInt8*	pOutBuf = new sal_uInt8[ nUnCompressedSize ];
128 	        sal_uInt8*	pTmpBuf = pOutBuf;
129 	        sal_uInt8*	pLast = pOutBuf + nUnCompressedSize - 1;
130 	        sal_uIntPtr   nIndex = 0UL, nCountByte, nRunByte;
131 	        sal_Bool    bEndDecoding = sal_False;
132 
133 	        do
134 	        {
135 		        nCountByte = *pInBuf++;
136 
137 		        if ( !nCountByte )
138 		        {
139 			        nRunByte = *pInBuf++;
140 
141 			        if ( nRunByte > 2 )
142 			        {
143 				        // absolutes Fuellen
144 				        memcpy( &pTmpBuf[ nIndex ], pInBuf, nRunByte );
145 				        pInBuf += nRunByte;
146 				        nIndex += nRunByte;
147 
148 				        // WORD-Alignment beachten
149 				        if ( nRunByte & 1 )
150 					        pInBuf++;
151 			        }
152 			        else if ( nRunByte == 1 )   // Ende des Bildes
153 				        bEndDecoding = sal_True;
154 		        }
155 		        else
156 		        {
157 			        const sal_uInt8 cVal = *pInBuf++;
158 
159 			        memset( &pTmpBuf[ nIndex ], cVal, nCountByte );
160 			        nIndex += nCountByte;
161 		        }
162 	        }
163 	        while ( !bEndDecoding && ( pTmpBuf <= pLast ) );
164 
165    		    rStmToRead.Write( pOutBuf, nUnCompressedSize );
166 
167             delete[] pOutBuf;
168             delete[] pCompressedBuffer;
169         }
170         else if( 2 == nVersion )
171         {
172 	        ZCodec aCodec;
173 
174             aCodec.BeginCompression();
175             aCodec.Decompress( rStm, rStmToRead );
176             aCodec.EndCompression();
177         }
178 	}
179 }
180