Type of Parameter

Hi People,

I am using one FM : - CALL FUNCTION 'SSFC_BASE64_DECODE'

CALL FUNCTION 'SSFC_BASE64_DECODE'

   EXPORTING

     B64DATA                        = lv_data1

  IMPORTING

    BINDATA                        = lv_content

Here i am exporting base64 data which is in string(text) format....and i am receiving the converted data in xstring format...

And aftwads i want to save that xstring data in database table(RAWSTRING)...

But the problem is what should be the datatype of 'B64DATA' which i am exporting ???

If i use string then it is saying that 'The string is too long'...and when i am using any other datatype like C etc. i am getting dump...(Type conflict)..

Please Help...