**
**     *  Does not begin with "/"
**     *  Does not contain any path element named "." or ".."
**     *  Does not contain any of these characters in the path: "\"
**     *  Does not end with "/".
**     *  Does not contain two or more "/" characters in a row.
**     *  Contains at least one character
**
** Invalid UTF8 characters result in a false return if bStrictUtf8 is
** true.  If bStrictUtf8 is false, invalid UTF8 characters are silently
** ignored.
*/
int file_is_simple_pathname(const char *z, int bStrictUtf8){
  int i;
  char c = z[0];
  char maskNonAscii = bStrictUtf8 ? 0x80 : 0x00;
  if( c=='/' || c==0 ) return 0;
  if( c=='.' ){
    if( z[1]=='/' || z[1]==0 ) return 0;
    if( z[1]=='.' && (z[2]=='/' || z[2]==0) ) return 0;
  }
  for(i=0; (c=z[i])!=0; i++){
    if( c & maskNonAscii ){
      if( (c & 0xf0) == 0xf0 ) {
        /* Unicode characters > U+FFFF are not supported.
         * Windows XP and earlier cannot handle them.
         */
        return 0;
      }
      if( (c & 0xf0) == 0xe0 ) {
        /* This is a 3-byte UTF-8 character */
        if ( (c & 0xfe) == 0xee ){
          /* Range U+E000 - U+FFFF (Starting with 0xee or 0xef in UTF-8 ) */
          if ( (c & 1) && ((z[i+1] & 0xff) >= 0xa4) ){
            /* But exclude U+F900 - U+FFFF (0xef followed by byte >= 0xa4),
             * which contain valid characters. */
            continue;
          }
          /* Unicode character in the range U+E000 - U+F8FF are for
           * private use, they shouldn't occur in filenames.  */
          return 0;
        }
        if( ((c & 0xff) == 0xed) && ((z[i+1] & 0xe0) == 0xa0) ){
          /* Unicode character in the range U+D800 - U+DFFF are for
           * surrogate pairs, they shouldn't occur in filenames. */
          return 0;
        }
      }
    }
    if( c=='\\' ){
      return 0;
    }
    if( c=='/' ){
      if( z[i+1]=='/' ) return 0;