1 /************************************************************** 2 * 3 * Licensed to the Apache Software Foundation (ASF) under one 4 * or more contributor license agreements. See the NOTICE file 5 * distributed with this work for additional information 6 * regarding copyright ownership. The ASF licenses this file 7 * to you under the Apache License, Version 2.0 (the 8 * "License"); you may not use this file except in compliance 9 * with the License. You may obtain a copy of the License at 10 * 11 * http://www.apache.org/licenses/LICENSE-2.0 12 * 13 * Unless required by applicable law or agreed to in writing, 14 * software distributed under the License is distributed on an 15 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 16 * KIND, either express or implied. See the License for the 17 * specific language governing permissions and limitations 18 * under the License. 19 * 20 *************************************************************/ 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 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 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