iTextSharp.text.pdf.PdfEncodings.ConvertToBytes C# (CSharp) Method

    public static byte[] ConvertToBytes(string text, string encoding) {
        if (text == null)
            return new byte[0];
        if (encoding == null || encoding.Length == 0) {
            int len = text.Length;
            byte[] b = new byte[len];
            for (int k = 0; k < len; ++k)
                b[k] = (byte)text[k];
            return b;
        }
        IExtraEncoding extra = (IExtraEncoding)extraEncodings[encoding.ToLower(System.Globalization.CultureInfo.InvariantCulture)];
        if (extra != null) {
            byte[] b = extra.CharToByte(text, encoding);
            if (b != null)
                return b;
        }
        IntHashtable hash = null;
        if (encoding.Equals(BaseFont.CP1252))
            hash = winansi;
        else if (encoding.Equals(PdfObject.TEXT_PDFDOCENCODING))
            hash = pdfEncoding;
        if (hash != null) {
            char[] cc = text.ToCharArray();
            int len = cc.Length;
            int ptr = 0;
            byte[] b = new byte[len];
            int c = 0;
            for (int k = 0; k < len; ++k) {
                char char1 = cc[k];
                if (char1 < 128 || (char1 > 160 && char1 <= 255))
                    c = char1;
                else
                    c = hash[char1];
                if (c != 0)
                    b[ptr++] = (byte)c;
            }
            if (ptr == len)
                return b;
            byte[] b2 = new byte[ptr];
            Array.Copy(b, 0, b2, 0, ptr);
            return b2;
        }
        Encoding encw = IanaEncodings.GetEncodingEncoding(encoding);
        byte[] preamble = encw.GetPreamble();
        if (preamble.Length == 0)
            return encw.GetBytes(text);
        byte[] encoded = encw.GetBytes(text);
        byte[] total = new byte[encoded.Length + preamble.Length];
        Array.Copy(preamble, 0, total, 0, preamble.Length);
        Array.Copy(encoded, 0, total, preamble.Length, encoded.Length);
        return total;
    }
    

 internal override byte[] ConvertToBytes(int char1)
 {
     if (_cjkMirror != null)
     {
         return(PdfEncodings.ConvertToBytes((char)char1, CjkFont.CJK_ENCODING));
     }
     else if (_isType0)
     {
         int[] ws = (int[])_metrics[char1];
         if (ws != null)
         {
             int g = ws[0];
             return(new[] { (byte)(g / 256), (byte)(g) });
         }
         else
         {
             return(new byte[0]);
         }
     }
     else
     {
         if (Uni2Byte.ContainsKey(char1))
         {
             return new[] { (byte)Uni2Byte[char1] }
         }
         ;
         else
         {
             return(new byte[0]);
         }
     }
 }