iTextSharp.text.pdf.PdfReader.ReadPRObject C# (CSharp) Метод

        protected internal PdfObject ReadPRObject() {
            tokens.NextValidToken();
            int type = tokens.TokenType;
            switch (type) {
                case PRTokeniser.TK_START_DIC: {
                    ++readDepth;
                    PdfDictionary dic = ReadDictionary();
                    --readDepth;
                    int pos = tokens.FilePointer;
                    // be careful in the trailer. May not be a "next" token.
                    bool hasNext;
                    do {
                        hasNext = tokens.NextToken();
                    } while (hasNext && tokens.TokenType == PRTokeniser.TK_COMMENT);

                    if (hasNext && tokens.StringValue.Equals("stream")) {
                        //skip whitespaces
                        int ch;
                        do {
                            ch = tokens.Read();                        
                        } while (ch == 32 || ch == 9 || ch == 0 || ch == 12);
                        if (ch != '\n')
                            ch = tokens.Read();
                        if (ch != '\n')
                            tokens.BackOnePosition(ch);
                        PRStream stream = new PRStream(this, tokens.FilePointer);
                        stream.Merge(dic);
                        stream.ObjNum = objNum;
                        stream.ObjGen = objGen;
                        return stream;
                    }
                    else {
                        tokens.Seek(pos);
                        return dic;
                    }
                }
                case PRTokeniser.TK_START_ARRAY: {
                    ++readDepth;
                    PdfArray arr = ReadArray();
                    --readDepth;
                    return arr;
                }
                case PRTokeniser.TK_NUMBER:
                    return new PdfNumber(tokens.StringValue);
                case PRTokeniser.TK_STRING:
                    PdfString str = new PdfString(tokens.StringValue, null).SetHexWriting(tokens.IsHexString());
                    str.SetObjNum(objNum, objGen);
                    if (strings != null)
                        strings.Add(str);
                    return str;
                case PRTokeniser.TK_NAME: {
                    PdfName cachedName = (PdfName)PdfName.staticNames[tokens.StringValue];
                    if (readDepth > 0 && cachedName != null) {
                        return cachedName;
                    } else {
                        // an indirect name (how odd...), or a non-standard one
                        return new PdfName(tokens.StringValue, false);
                    }
                }
                case PRTokeniser.TK_REF:
                    int num = tokens.Reference;
                    PRIndirectReference refi = new PRIndirectReference(this, num, tokens.Generation);
                    return refi;
                default:
                    String sv = tokens.StringValue;
                    if ("null".Equals(sv)) {
                        if (readDepth == 0) {
                            return new PdfNull();
                        } //else
                        return PdfNull.PDFNULL;
                    }
                    else if ("true".Equals(sv)) {
                        if (readDepth == 0) {
                            return new PdfBoolean( true );
                        } //else
                        return PdfBoolean.PDFTRUE;
                    }
                    else if ("false".Equals(sv)) {
                        if (readDepth == 0) {
                            return new PdfBoolean( false );
                        } //else
                        return PdfBoolean.PDFFALSE;
                    }
                    return new PdfLiteral(-type, tokens.StringValue);
            }
        }