if ((ch >= 'A') && (ch <= 'Z')) *cp = ch + ('a' - 'A');
if ((ch >= 'a') && (ch <= 'z')) *cp = ch - ('a' - 'A');
      write( const char* aSource, PRUint32 aSourceLength )        {          char* cp = NS_CONST_CAST(char*,aSource);          const char* end = aSource + aSourceLength;          while (cp != end) {            char ch = *cp;            if ((ch >= 'A') && (ch <= 'Z'))              *cp = ch + ('a' - 'A');            ++cp;          }          return aSourceLength;        }