if( c&0x10 ){
          /* Unicode characters > U+FFFF are not supported.
           * Windows XP and earlier cannot handle them.
           */
          return 0;
        }
        /* This is a 3-byte UTF-8 character */
        unicode = ((c&0x0f)<<12) + ((z[i+1]&0x3f)<<6) + (z[i+2]&0x3f);
        if( unicode <= 0x07ff ){
          /* overlong form */
          return 0;
        }else if( unicode>=0xe000 ){
          /* U+E000..U+FFFF */
          if( (unicode<=0xf8ff) || (unicode>=0xfffe) ){
            /* U+E000..U+F8FF are for private use.
             * U+FFFE..U+FFFF are noncharacters. */
            return 0;
          } else if( (unicode>=0xfdd0) && (unicode<=0xfdef) ){
            /* U+FDD0..U+FDEF are noncharacters. */
            return 0;
          }
        }else if( (unicode>=0xD800) && (unicode<=0xDFFF) ){
          /* U+D800..U+DFFF are for surrogate pairs. */
          return 0;
        }
      }
      do{
        if( (z[i+1]&0xc0)!=0x80 ){
          /* Invalid continuation byte (multi-byte UTF-8) */
          return 0;
        }
        /* The hi-bits of c are used to keep track of the number of expected
         * continuation-bytes, so we don't need a separate counter. */
        c<<=1; ++i;
      }while( c>=0xc0 );
    }else if( c=='\\' ){
      return 0;
    }
    if( c=='/' ){
      if( z[i+1]=='/' ) return 0;
      if( z[i+1]=='.' ){