// methods
/**
* Compresses the stream.
*
* @throws PdfException if a filter is allready defined
*/
public void flateCompress()
{
if (!Document.compress)
{
return;
}
// check if the flateCompress-method has allready been
if (compressed)
{
return;
}
// check if a filter allready exists
PdfObject filter = get(PdfName.FILTER);
if (filter != null)
{
if (filter.isName() && ((PdfName)filter).CompareTo(PdfName.FLATEDECODE) == 0)
{
return;
}
else if (filter.isArray() && ((PdfArray)filter).contains(PdfName.FLATEDECODE))
{
return;
}
else
{
throw new PdfException("Stream could not be compressed: filter is not a name or array.");
}
}
try {
// compress
MemoryStream stream = new MemoryStream();
DeflaterOutputStream zip = new DeflaterOutputStream(stream);
if (streamBytes != null)
{
streamBytes.WriteTo(zip);
}
else
{
zip.Write(bytes, 0, bytes.Length);
}
//zip.Close();
zip.Finish();
// update the object
streamBytes = stream;
bytes = null;
put(PdfName.LENGTH, new PdfNumber(streamBytes.Length));
if (filter == null)
{
put(PdfName.FILTER, PdfName.FLATEDECODE);
}
else
{
PdfArray filters = new PdfArray(filter);
filters.Add(PdfName.FLATEDECODE);
put(PdfName.FILTER, filters);
}
compressed = true;
}
catch (IOException ioe) {
throw ioe;
}
}
