/// <summary>
/// Writes all the indirect object references that are not free, and have no already beew written to the underlying base stream
/// </summary>
protected virtual void WriteAllIndirectObjects(PDFXRefTable table)
{
foreach (PDFXRefTableSection section in table.Sections)
{
foreach (PDFXRefTableEntry entry in section.Entries)
{
if (entry.Free == false && entry.Reference != null && entry.Reference.Written == false)
{
WriteAnIndirectObject(entry.Reference);
}
}
}
}
/// <summary>
/// Opens a new PDF document for writing to appending as a overwrite of the original file if provided, and copying the content of the original file as specified.
/// </summary>
/// <param name="orig"></param>
/// <param name="copytoDestination"></param>
public override void OpenDocument(PDFFile orig, bool copytoDestination)
{
PDFXRefTable prev = null;
int startindex = 0;
int gen = 0;
if (null != orig)
{
if (copytoDestination)
{
orig.WriteTo(this.BaseStream);
}
prev = orig.DocumentXRefs;
startindex = prev.MaxReference + 1;
gen = prev.Generation;
}
this.InitXRefTable(startindex, gen, prev);
}
/// <summary>
/// Outputs a complete XRefTable onto the base stream
/// </summary>
/// <param name="table"></param>
protected void WriteXRefTable(PDFXRefTable table)
{
this.Log("Outputting XRefTable onto the stream at position " + this.BaseStream.Position.ToString());
this.BaseStream.Flush();
table.Offset = this.BaseStream.Position;
this.BaseStream.WriteLine("xref");
foreach (PDFXRefTableSection section in table.Sections)
{
this.BaseStream.Write(section.Start.ToString());
this.BaseStream.Write(" ");
this.BaseStream.WriteLine(section.Count.ToString());
foreach (PDFXRefTableEntry entry in section.Entries)
{
if (entry.Free)
{
int next = 0;
if (null != entry.NextFree)
{
next = entry.NextFree.Index;
}
this.BaseStream.Write(next.ToString("0000000000"));
this.BaseStream.Write(entry.Generation.ToString(" 00000"));
this.BaseStream.Write(" f");
}
else
{
this.BaseStream.Write(entry.Offset.ToString("0000000000"));
this.BaseStream.Write(entry.Generation.ToString(" 00000"));
this.BaseStream.Write(" n");
}
this.BaseStream.Write(Constants.XRefEntrySeparator);
}
}
this.BaseStream.Flush();
}
