write( const input_type* aSource, PRUint32 aSourceLength )
PRUint32 write( const CharT* chars, PRUint32 N )
      write( const input_type* aSource, PRUint32 aSourceLength )        {          const input_type* done_writing = aSource + aSourceLength;          while ( aSource < done_writing )            *mDestination++ = (output_type)(unsigned_input_type)(*aSource++);  // use old-style cast to mimic old |ns[C]String| behavior          return aSourceLength;        }