private void AppendNewRefToFreeList(PdfIndirectReference reference)
{
reference.SetOffset(0);
if (freeReferencesLinkedList.IsEmpty <int, PdfIndirectReference>())
{
System.Diagnostics.Debug.Assert(false);
// free references list is not initialized yet
return;
}
PdfIndirectReference lastFreeRef = freeReferencesLinkedList.Get(0);
((PdfIndirectReference)lastFreeRef.SetState(PdfObject.MODIFIED)).SetOffset(reference.GetObjNumber());
freeReferencesLinkedList.Put(reference.GetObjNumber(), lastFreeRef);
freeReferencesLinkedList.Put(0, reference);
}
/// <summary>Flushes the object.</summary>
/// <remarks>Flushes the object. Override this method if you want to define custom behaviour for object flushing.
/// </remarks>
/// <param name="pdfObject">object to flush.</param>
/// <param name="canBeInObjStm">indicates whether object can be placed into object stream.</param>
/// <exception cref="System.IO.IOException">on error.</exception>
protected internal virtual void FlushObject(PdfObject pdfObject, bool canBeInObjStm)
{
PdfIndirectReference indirectReference = pdfObject.GetIndirectReference();
if (IsFullCompression() && canBeInObjStm)
{
PdfObjectStream objectStream = GetObjectStream();
objectStream.AddObject(pdfObject);
}
else
{
indirectReference.SetOffset(GetCurrentPos());
WriteToBody(pdfObject);
}
((PdfIndirectReference)indirectReference.SetState(PdfObject.FLUSHED)).ClearState(PdfObject.MUST_BE_FLUSHED
);
switch (pdfObject.GetObjectType())
{
case PdfObject.BOOLEAN:
case PdfObject.NAME:
case PdfObject.NULL:
case PdfObject.NUMBER:
case PdfObject.STRING: {
((PdfPrimitiveObject)pdfObject).content = null;
break;
}
case PdfObject.ARRAY: {
PdfArray array = ((PdfArray)pdfObject);
MarkArrayContentToFlush(array);
array.ReleaseContent();
break;
}
case PdfObject.STREAM:
case PdfObject.DICTIONARY: {
PdfDictionary dictionary = ((PdfDictionary)pdfObject);
MarkDictionaryContentToFlush(dictionary);
dictionary.ReleaseContent();
break;
}
case PdfObject.INDIRECT_REFERENCE: {
MarkObjectToFlush(((PdfIndirectReference)pdfObject).GetRefersTo(false));
break;
}
}
}
protected internal virtual void FreeReference(PdfIndirectReference reference)
{
reference.SetOffset(0);
reference.SetState(PdfObject.FREE);
if (!reference.CheckState(PdfObject.FLUSHED))
{
if (reference.refersTo != null)
{
reference.refersTo.SetIndirectReference(null).SetState(PdfObject.MUST_BE_INDIRECT);
reference.refersTo = null;
}
if (reference.GetGenNumber() < MAX_GENERATION)
{
freeReferences.Add(reference.GetObjNumber());
xref[reference.GetObjNumber()] = null;
}
}
}
