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0026981: Application Framework - read a BinOcaf document from С++ stream sequentially

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The current version of the document supports partial reading. So, as a result, the shapes section is dispersed into attributes and it becomes easy avoid any seekg call during the reading.
But this will work only in case whole document is opened. For partial reading seekg functions could be naturally called.
This commit is contained in:
mpv 2021-08-31 14:46:23 +03:00 committed by smoskvin
parent f8d8c3f2bc
commit 7e63845c9e
1 changed files with 20 additions and 17 deletions
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37
src/BinLDrivers/BinLDrivers_DocumentRetrievalDriver.cxx
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@ -226,7 +226,6 @@ void BinLDrivers_DocumentRetrievalDriver::Read (Standard_IStream&
mySections.Clear();
myPAtt.Init();
Handle(TDF_Data) aData = (!theFilter.IsNull() && theFilter->IsAppendMode()) ? aDoc->GetData() : new TDF_Data();
std::streampos aDocumentPos = -1;
Message_ProgressScope aPS (theRange, "Reading data", 3);
Standard_Boolean aQuickPart = IsQuickPart (aFileVer);
@ -246,29 +245,33 @@ void BinLDrivers_DocumentRetrievalDriver::Read (Standard_IStream&
return;
}
aDocumentPos = theIStream.tellg(); // position of root label
BinLDrivers_VectorOfDocumentSection::Iterator anIterS (mySections);
for (; anIterS.More(); anIterS.Next()) {
BinLDrivers_DocumentSection& aCurSection = anIterS.ChangeValue();
if (aCurSection.IsPostRead() == Standard_False) {
theIStream.seekg ((std::streampos) aCurSection.Offset());
if (aCurSection.Name().IsEqual (SHAPESECTION_POS))
{
ReadShapeSection (aCurSection, theIStream, false, aPS.Next());
if (!aPS.More())
// if there is only empty section, do not call tellg and seekg
if (!mySections.IsEmpty() && (mySections.Size() > 1 || !anIterS.Value().Name().IsEqual(ENDSECTION_POS)))
{
std::streampos aDocumentPos = theIStream.tellg(); // position of root label
for (; anIterS.More(); anIterS.Next()) {
BinLDrivers_DocumentSection& aCurSection = anIterS.ChangeValue();
if (aCurSection.IsPostRead() == Standard_False) {
theIStream.seekg ((std::streampos) aCurSection.Offset());
if (aCurSection.Name().IsEqual (SHAPESECTION_POS))
{
myReaderStatus = PCDM_RS_UserBreak;
return;
ReadShapeSection (aCurSection, theIStream, false, aPS.Next());
if (!aPS.More())
{
myReaderStatus = PCDM_RS_UserBreak;
return;
}
}
else if (!aCurSection.Name().IsEqual (ENDSECTION_POS))
ReadSection (aCurSection, theDoc, theIStream);
}
else if (!aCurSection.Name().IsEqual (ENDSECTION_POS))
ReadSection (aCurSection, theDoc, theIStream);
}
theIStream.seekg(aDocumentPos);
}
} else { //aFileVer < 3
aDocumentPos = theIStream.tellg(); // position of root label
std::streampos aDocumentPos = theIStream.tellg(); // position of root label
// retrieve SHAPESECTION_POS string
char aShapeSecLabel[SIZEOFSHAPELABEL + 1];
aShapeSecLabel[SIZEOFSHAPELABEL] = 0x00;
@ -309,10 +312,10 @@ void BinLDrivers_DocumentRetrievalDriver::Read (Standard_IStream&
}
}
}
theIStream.seekg(aDocumentPos);
} // end of reading Sections or shape section
// Return to read of the Document structure
theIStream.seekg(aDocumentPos);
// read the header (tag) of the root label
Standard_Integer aTag;