/// <summary>
/// Parses a stream object and removes OCGs. </summary>
/// <param name="stream"> a stream object </param>
/// <param name="resources"> the resources dictionary of that object (containing info about the OCGs) </param>
public virtual void Parse(PRStream stream, PdfDictionary resources) {
baos = new MemoryStream();
properties = resources.GetAsDict(PdfName.PROPERTIES);
xobj = new HashSet2<PdfName>();
PdfDictionary xobjects = resources.GetAsDict(PdfName.XOBJECT);
if (xobjects != null) {
// remove XObject (form or image) that belong to an OCG that needs to be removed
foreach (PdfName name in xobjects.Keys) {
PRStream xobject = (PRStream) xobjects.GetAsStream(name);
PdfDictionary oc = xobject.GetAsDict(PdfName.OC);
if (oc != null) {
PdfString ocname = oc.GetAsString(PdfName.NAME);
if (ocname != null && ocgs.Contains(ocname.ToString())) {
xobj.Add(name);
}
}
}
foreach (PdfName name in xobj) {
xobjects.Remove(name);
}
}
// parse the content stream
byte[] contentBytes = PdfReader.GetStreamBytes(stream);
PRTokeniser tokeniser = new PRTokeniser(new RandomAccessFileOrArray(contentBytes));
PdfContentParser ps = new PdfContentParser(tokeniser);
List<PdfObject> operands = new List<PdfObject>();
while (ps.Parse(operands).Count > 0) {
PdfLiteral @operator = (PdfLiteral) operands[operands.Count - 1];
ProcessOperator(this, @operator, operands);
}
baos.Flush();
baos.Close();
stream.SetData(baos.GetBuffer());
}
