code: public int getFCD16(int c) {
          if(c<0) {
              return 0;
          } else if(c<0x180) {
              return tccc180[c];
          } else if(c<=0xffff) {
              if(!singleLeadMightHaveNonZeroFCD16(c)) { return 0; }
          }
          return getFCD16FromNormData(c);
      }
docs: Returns the FCD data for code point c.
  @param c A Unicode code point.
  @return The lccc(c) in bits 15..8 and tccc(c) in bits 7..0.