xref: /aoo42x/main/tools/source/stream/vcompat.cxx (revision 89b56da7)
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11  *   http://www.apache.org/licenses/LICENSE-2.0
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16  * KIND, either express or implied.  See the License for the
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21 
22 
23 
24 // MARKER(update_precomp.py): autogen include statement, do not remove
25 #include "precompiled_tools.hxx"
26 
27 #define _VCOMPAT_CXX
28 #include <tools/stream.hxx>
29 #include <tools/vcompat.hxx>
30 
31 // -----------------
32 // - VersionCompat -
33 // -----------------
34 
VersionCompat(SvStream & rStm,sal_uInt16 nStreamMode,sal_uInt16 nVersion)35 VersionCompat::VersionCompat( SvStream& rStm, sal_uInt16 nStreamMode, sal_uInt16 nVersion ) :
36             mpRWStm     ( &rStm ),
37             mnStmMode   ( nStreamMode ),
38             mnVersion   ( nVersion )
39 {
40     if( !mpRWStm->GetError() )
41     {
42         if( STREAM_WRITE == mnStmMode )
43         {
44             *mpRWStm << mnVersion;
45             mnTotalSize = ( mnCompatPos = mpRWStm->Tell() ) + 4UL;
46             mpRWStm->SeekRel( 4L );
47         }
48         else
49         {
50             *mpRWStm >> mnVersion;
51             *mpRWStm >> mnTotalSize;
52             mnCompatPos = mpRWStm->Tell();
53         }
54     }
55 }
56 
57 // ------------------------------------------------------------------------
58 
~VersionCompat()59 VersionCompat::~VersionCompat()
60 {
61     if( STREAM_WRITE == mnStmMode )
62     {
63         const sal_uInt32 nEndPos = mpRWStm->Tell();
64 
65         mpRWStm->Seek( mnCompatPos );
66         *mpRWStm << ( nEndPos - mnTotalSize );
67         mpRWStm->Seek( nEndPos );
68     }
69     else
70     {
71         const sal_uInt32 nReadSize = mpRWStm->Tell() - mnCompatPos;
72 
73         if( mnTotalSize > nReadSize )
74             mpRWStm->SeekRel( mnTotalSize - nReadSize );
75     }
76 }
77