public string fileExten;   // file extension stoing var


        //decompress the file

        public void decompress(string fileName, FileStream fs2)
        {
            readBitByBit bit = new readBitByBit(fileName);

            FileTreeroot = ReadTreeHeader(bit);
            program.printPreorder(FileTreeroot);
            var  output    = new StreamWriter(fs2);
            int  returnbit = -1;
            char leaf      = '1'; //checking if we reached the end of file

            // PQueue.cNode top = root;
            PQueue.cNode top = FileTreeroot;

            while (true)                                          //will run until we found the pseduo_EOF
            {
                if (top.leftZero == null && top.rightOne == null) //if leaf node is reached
                {
                    leaf = top.value;
                    if (leaf == (char)program.Pseudo_EOF)   //if it is last letter close the file
                    {
                        output.Close();
                        break;
                    }
                    else
                    {
                        output.Write(leaf);  //else write in file
                        top = FileTreeroot;  //again start from root
                    }
                }
                returnbit = bit.bitRead();
                if (returnbit == 0)  //if not leaf keep on reading the file
                {
                    top = top.leftZero;
                }
                else if (returnbit == 1)
                {
                    top = top.rightOne;
                }
            }
            output.Close();
            bit.close();
        }
        //decompress the file

        public void pdfDecompress(string fileName)
        {
            readBitByBit bit = new readBitByBit(fileName);

            FileTreeroot = ReadTreeHeader(bit);
            program.printPreorder(FileTreeroot);


            int    returnbit = -1;   //initializing
            char   leaf      = '1';  //checking if we reached the end of file
            string content   = null; //initializing

            PQueue.cNode top = FileTreeroot;

            while (true)                                          //will run until we found the pseduo_EOF
            {
                if (top.leftZero == null && top.rightOne == null) //if leaf node is reached
                {
                    leaf = top.value;
                    if (leaf == (char)program.Pseudo_EOF)   //if it is last letter close the file
                    {
                        break;
                    }
                    else
                    {
                        content = content + leaf.ToString();
                    }
                    top = FileTreeroot;   //again start from root
                }

                returnbit = bit.bitRead();
                if (returnbit == 0)  //if not leaf keep on reading the file
                {
                    top = top.leftZero;
                }
                else if (returnbit == 1)
                {
                    top = top.rightOne;
                }
            }
            bit.close();

            string newC = null;

            try
            {
                newC = content.Substring(3);   // in case of empty file
            }
            catch
            {
            }

            //create pdf
            if (fileExten == ".pdf")
            {
                Document  document  = new Document(PageSize.A4, 50, 35, 50, 35);
                PdfWriter pdfWriter = PdfWriter.GetInstance(document, new FileStream(decmpFile, FileMode.Create));
                document.Open();
                Paragraph p = new Paragraph();
                p.Font = FontFactory.GetFont(FontFactory.TIMES_ROMAN, 12f, BaseColor.BLACK);
                p.Add(newC);
                document.Add(p);
                document.Close();
            }


            if (fileExten == ".docx")
            {
                var doc = DocX.Create(decmpFile);
                doc.InsertParagraph(newC).Font("Times New Roman").FontSize(12d);  //inserting paragraph
                doc.Save();
            }
        }