private void writeTrailer(Stream writer, PDFDictionary trailer)
{
string trailerHeader = "trailer\n";
writer.Write(System.Text.Encoding.ASCII.GetBytes(trailerHeader), 0, trailerHeader.Length);
SaveParameters param = new SaveParameters(writer);
param.WriteInheritableObjects = false;
trailer.Write(param);
writer.Write(System.Text.Encoding.ASCII.GetBytes("\n"), 0, 1);
}
public void Write(SaveParameters param)
{
_stream.Position = 0;
MemoryStream output = _stream;
//set compression
bool filter = false;
if (param.Compression == Compression.Flate)
{
PDFName subtype = (PDFName)_dictionary["Subtype"];
Filter[] filters = getFilters();
if (subtype != null && subtype.GetValue() == "Image" && filters.Length > 0 && filters[0] == Filter.DCT)
{
output = param.Buffer;
output.SetLength(0);
_stream.WriteTo(output);
filter = true;
}
else if (param.Compression != Compression.None && getFilters().Length == 0)
{
output = param.Buffer;
output.SetLength(0);
FlateDecoder.Code(_stream, output);
_dictionary.AddItem("Filter", new PDFName("FlateDecode"));
filter = true;
}
}
//set encryption
if (param.Encryptor != null)
{
param.Encryptor.ResetObjectReference(param.ObjNo, param.GenNo, DataType.Stream);
if (filter)
{
byte[] buffer = output.GetBuffer();
int length = (int)output.Length;
output.SetLength(0);
param.Encryptor.Encrypt(buffer, 0, length, output, DataType.Stream);
}
else
{
output = param.Buffer;
output.SetLength(0);
param.Encryptor.Encrypt(_stream.GetBuffer(), 0, (int)_stream.Length, output, DataType.Stream);
}
}
output.Position = 0;
_dictionary.AddItem("Length", new PDFNumber(output.Length));
_dictionary.Write(param);
param.Stream.Write(StartStream, 0, StartStream.Length);
param.Stream.Write(output.GetBuffer(), 0, (int)output.Length);
param.Stream.Write(EndStream, 0, EndStream.Length);
if (filter)
{
_dictionary.RemoveItem("Filter");
}
}
