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Add xref-streams tied to any parts, not just the first

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On a large sample of pdf-files PdfPig failed to read the correct StructTree-object for about 1% of them. The StructTree object was simply missing in the CrossReferenceTable.CrossReferenceTable.
It turned out that the constructed CrossReferenceTable could miss Stream-parts if there were multiple Table-parts because a stream will only be added if it's associated with the very first Table-part. The remedy would seem to be to check for and add streams that are associated with any of the Table-parts, not just the first one.
On a sample of 72 files where this failed, this changed fixed the StructTree for all of them.
This commit is contained in:
ricflams
2025-09-26 20:36:43 +02:00
committed by BobLd
parent ca284e0cb9
commit 397ccb15d6
1 changed files with 8 additions and 8 deletions
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16
src/UglyToad.PdfPig/CrossReference/CrossReferenceTableBuilder.cs
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@@ -56,16 +56,16 @@
// add this and follow chain defined by 'Prev' keys // add this and follow chain defined by 'Prev' keys
xrefPartToBytePositionOrder.Add(firstCrossReferenceOffset); xrefPartToBytePositionOrder.Add(firstCrossReferenceOffset);
// Get any streams that are tied to this table.
var activePart = currentPart;
var dependents = parts.Where(x => x.TiedToXrefAtOffset == activePart.Offset);
foreach (var dependent in dependents)
{
xrefPartToBytePositionOrder.Add(dependent.Offset);
}
while (currentPart.Dictionary != null) while (currentPart.Dictionary != null)
{ {
// Get any streams that are tied to this table.
var activePart = currentPart;
var dependents = parts.Where(x => x.TiedToXrefAtOffset == activePart.Offset);
foreach (var dependent in dependents)
{
xrefPartToBytePositionOrder.Add(dependent.Offset);
}
long prevBytePos = currentPart.GetPreviousOffset(); long prevBytePos = currentPart.GetPreviousOffset();
if (prevBytePos == -1) if (prevBytePos == -1)
{ {