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Handling object reference streams

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This commit is contained in:
Jakub Melka
2019-07-01 12:29:57 +02:00
parent 8c130ca013
commit 4d782af971
7 changed files with 383 additions and 20 deletions
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31
PdfForQtLib/sources/pdfxreftable.cpp
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@ -44,7 +44,8 @@ void PDFXRefTable::readXRefTable(PDFParsingContext* context, const QByteArray& b
// Check, if we have cyclical references between tables
if (processedOffsets.count(currentOffset))
{
throw PDFParserException(tr("Cyclic reference found in reference table."));
// If cyclical reference occurs, do not report error, just ignore it.
continue;
}
else
{
@ -300,6 +301,7 @@ void PDFXRefTable::readXRefTable(PDFParsingContext* context, const QByteArray& b
case 0:
// Free object
break;
case 1:
{
Entry entry;
@ -313,7 +315,23 @@ void PDFXRefTable::readXRefTable(PDFParsingContext* context, const QByteArray& b
}
break;
}
case 2:
{
Entry entry;
entry.reference = PDFObjectReference(objectNumber, 0);
entry.objectStream = PDFObjectReference(itemObjectNumberOfObjectStreamOrByteOffset, 0);
entry.indexInObjectStream = itemGenerationNumberOrObjectIndex;
entry.type = EntryType::InObjectStream;
if (m_entries[objectNumber].type == EntryType::Free)
{
m_entries[objectNumber] = std::move(entry);
}
break;
}
default:
// According to the specification, treat this object as null object
break;
@ -341,6 +359,17 @@ std::vector<PDFXRefTable::Entry> PDFXRefTable::getOccupiedEntries() const
return result;
}
std::vector<PDFXRefTable::Entry> PDFXRefTable::getObjectStreamEntries() const
{
std::vector<PDFXRefTable::Entry> result;
// Suppose majority of items are occupied
result.reserve(m_entries.size());
std::copy_if(m_entries.cbegin(), m_entries.cend(), std::back_inserter(result), [](const Entry& entry) { return entry.type == EntryType::InObjectStream; });
return result;
}
const PDFXRefTable::Entry& PDFXRefTable::getEntry(PDFObjectReference reference) const
{
// We must also check generation number here. For this reason, we compare references of the entry at given position.