iTextSharp.text.pdf.fonts.cmaps.CMapToUnicode.CreateReverseMapping C# (CSharp) Method

        public IDictionary<int, int> CreateReverseMapping()
        {
            IDictionary<int, int> result = new Dictionary<int, int>();
            foreach (KeyValuePair<int, String> entry in singleByteMappings) {
                result[ConvertToInt(entry.Value)] = entry.Key;
            }
            foreach (KeyValuePair<int, String> entry in doubleByteMappings) {
                result[ConvertToInt(entry.Value)] = entry.Key;
            }
            return result;
        }

 /**
  * Parses the ToUnicode entry, if present, and constructs a CMap for it
  * @since 2.1.7
  */
 private void ProcessToUnicode(){
     PdfObject toUni = PdfReader.GetPdfObjectRelease(fontDic.Get(PdfName.TOUNICODE));
     if (toUni is PRStream) {
         try {
             byte[] touni = PdfReader.GetStreamBytes((PRStream)toUni);
             CidLocationFromByte lb = new CidLocationFromByte(touni);
             toUnicodeCmap = new CMapToUnicode();
             CMapParserEx.ParseCid("", toUnicodeCmap, lb);
             uni2cid = toUnicodeCmap.CreateReverseMapping();
         } catch {
             toUnicodeCmap = null;
             uni2cid = null;
             // technically, we should log this or provide some sort of feedback... but sometimes the cmap will be junk, but it's still possible to get text, so we don't want to throw an exception
             //throw new IllegalStateException("Unable to process ToUnicode map - " + e.GetMessage(), e);
         }
     }
     else if(isType0) {
         // fake a ToUnicode for CJK Identity-H fonts
         try {
             PdfName encodingName = fontDic.GetAsName(PdfName.ENCODING);
             if(encodingName == null)
                 return;
             String enc = PdfName.DecodeName(encodingName.ToString());
             if(!enc.Equals("Identity-H"))
                 return;
             PdfArray df = (PdfArray)PdfReader.GetPdfObjectRelease(fontDic.Get(PdfName.DESCENDANTFONTS));
             PdfDictionary cidft = (PdfDictionary)PdfReader.GetPdfObjectRelease(df[0]);
             PdfDictionary cidinfo = cidft.GetAsDict(PdfName.CIDSYSTEMINFO);
             if(cidinfo == null)
                 return;
             PdfString ordering = cidinfo.GetAsString(PdfName.ORDERING);
             if(ordering == null)
                 return;
             CMapToUnicode touni = IdentityToUnicode.GetMapFromOrdering(ordering.ToUnicodeString());
             if(touni == null)
                 return;
             toUnicodeCmap = touni;
             uni2cid = toUnicodeCmap.CreateReverseMapping();
         } catch(IOException e) {
             toUnicodeCmap = null;
             uni2cid = null;
         }
     }
 }