private void SerObject(PdfObject obj, int level, ByteBufferOutputStream bb, IntHashtable serialized) { if (level <= 0) { return; } if (obj == null) { bb.Append("$Lnull"); return; } PdfIndirectReference reference = null; ByteBufferOutputStream savedBb = null; if (obj.IsIndirectReference()) { reference = (PdfIndirectReference)obj; int key = GetCopyObjectKey(obj); if (serialized.ContainsKey(key)) { bb.Append((int)serialized.Get(key)); return; } else { savedBb = bb; bb = new ByteBufferOutputStream(); } } if (obj.IsStream()) { bb.Append("$B"); SerDic((PdfDictionary)obj, level - 1, bb, serialized); if (level > 0) { md5.Reset(); bb.Append(md5.Digest(((PdfStream)obj).GetBytes(false))); } } else { if (obj.IsDictionary()) { SerDic((PdfDictionary)obj, level - 1, bb, serialized); } else { if (obj.IsArray()) { SerArray((PdfArray)obj, level - 1, bb, serialized); } else { if (obj.IsString()) { bb.Append("$S").Append(obj.ToString()); } else { if (obj.IsName()) { bb.Append("$N").Append(obj.ToString()); } else { bb.Append("$L").Append(obj.ToString()); } } } } } if (savedBb != null) { int key = GetCopyObjectKey(reference); if (!serialized.ContainsKey(key)) { serialized.Put(key, CalculateHash(bb.GetBuffer())); } savedBb.Append(bb); } }