/// <summary>
/// Implements saving a PDF file.
/// </summary>
void DoSave(PDFWriter writer)
{
if (_pages == null || _pages.Count == 0)
{
if (OutStream != null)
{
// Give feedback if the wrong constructor was used.
throw new InvalidOperationException("Cannot save a PDF document with no pages. Do not use \"public PDFDocument(string filename)\" or \"public PDFDocument(Stream outputStream)\" if you want to open an existing PDF document from a file or stream; use PDFReader.Open() for that purpose.");
}
throw new InvalidOperationException("Cannot save a PDF document with no pages.");
}
try
{
// HACK: Remove XRefTrailer
if (Trailer is PDFCrossReferenceStream)
{
// HACK^2: Preserve the SecurityHandler.
PDFStandardSecurityHandler securityHandler = _securitySettings.SecurityHandler;
Trailer = new PDFTrailer((PDFCrossReferenceStream)Trailer)
{
_securityHandler = securityHandler
};
}
bool encrypt = _securitySettings.DocumentSecurityLevel != PDFDocumentSecurityLevel.None;
if (encrypt)
{
PDFStandardSecurityHandler securityHandler = _securitySettings.SecurityHandler;
if (securityHandler.Reference == null)
{
IrefTable.Add(securityHandler);
}
else
{
Debug.Assert(IrefTable.Contains(securityHandler.ObjectID));
}
Trailer.Elements[PDFTrailer.Keys.Encrypt] = _securitySettings.SecurityHandler.Reference;
}
else
{
Trailer.Elements.Remove(PDFTrailer.Keys.Encrypt);
}
PrepareForSave();
if (encrypt)
{
_securitySettings.SecurityHandler.PrepareEncryption();
}
writer.WriteFileHeader(this);
PDFReference[] irefs = IrefTable.AllReferences;
int count = irefs.Length;
for (int idx = 0; idx < count; idx++)
{
PDFReference iref = irefs[idx];
iref.Position = writer.Position;
iref.Value.WriteObject(writer);
}
int startxref = writer.Position;
IrefTable.WriteObject(writer);
writer.WriteRaw("trailer\n");
Trailer.Elements.SetInteger("/Size", count + 1);
Trailer.WriteObject(writer);
writer.WriteEof(this, startxref);
}
finally
{
if (writer != null)
{
writer.Stream.Flush();
}
}
}