Brtdku

I am trying to read SMS from D-link DWM-157 HSPA+USB adapter. I can read SMS by AT commands. The code works fine when sms contain characters less than 160 If SMS contain multipart it converts into 7-bit format which I somehow now able to decode by using this library. the Decode7bit() method works fine but when string (parameter of this method) length is 268 but when length is less than 268 it gives garbage values in result. The code is

  public static byte GetInvertBytes(string source)

    {

        byte bytes = GetBytes(source);



        Array.Reverse(bytes);



        return bytes;

    }

    public static byte GetBytes(string source, int fromBase)

    {

        List<byte> bytes = new List<byte>();



        for (int i = 0; i < source.Length / 2; i++)

            bytes.Add(Convert.ToByte(source.Substring(i * 2, 2), fromBase));



        return bytes.ToArray();

    }



    public static byte GetBytes(string source)

    {

        return GetBytes(source, 16);

    }



    public static string Decode7bit(string source, int length)

    {

        byte bytes = GetInvertBytes(source);



        string binary = string.Empty;



        foreach (byte b in bytes)

            binary += Convert.ToString(b, 2).PadLeft(8, '0');



        binary = binary.PadRight(length * 7, '0');



        string result = string.Empty;



        for (int i = 1; i <= length; i++)

            result += (char)Convert.ToByte(binary.Substring(binary.Length - i * 7, 7), 2);



        //return result.Replace('x0', 'x40');

        return result.Replace("", "");

    }

and the code by which I am getting SMS from GSM module is

 public string Read()

    {

        //Console.WriteLine("Reading..");



        gsmPort.WriteLine("AT+CMGF=1"); // Set mode to Text(1) or PDU(0)

        Thread.Sleep(1000); // Give a second to write

        //gsmPort.WriteLine("AT+CPMS="SM""); // Set storage to SIM(SM)

        gsmPort.WriteLine("AT+CPMS="ME","SM","MT""); // Set storage to SIM(SM)



        Thread.Sleep(1000);

       // gsmPort.WriteLine("AT+CMGL="REC UNREAD""); // What category to read ALL, REC READ, or REC UNREAD

        gsmPort.WriteLine("AT+CMGL="ALL""); // What category to read ALL, REC READ, or REC UNREAD

        Thread.Sleep(1000);

        gsmPort.Write("r");

        Thread.Sleep(1000);





        string response = gsmPort.ReadExisting();









        if (response.EndsWith("rnOKrnr") || response.EndsWith("rnOKrn"))

        { //there is no error

            //Console.WriteLine(response);

            return response;

            // add more code here to manipulate reponse string.

        }

        else

        {

            return "ERROR";

            // add more code here to handle error.

            //Console.WriteLine(response);

        }



    }

I searched for 7-bit decoders but cannot get any suitable result. Can anyone tell me how to convert 7-bit string to plain text, or any other method to read multipart SMS without 7-bit encoding or any AT command which do the said.