code: function EUCKREncoder(options) {
      var fatal = options.fatal;
      /**
       * @param {Stream} stream Input stream.
       * @param {number} code_point Next code point read from the stream.
       * @return {(number|!Array.<number>)} Byte(s) to emit.
       */
      this.handler = function(stream, code_point) {
        // 1. If code point is end-of-stream, return finished.
        if (code_point === end_of_stream)
          return finished;
  
        // 2. If code point is an ASCII code point, return a byte whose
        // value is code point.
        if (isASCIICodePoint(code_point))
          return code_point;
  
        // 3. Let pointer be the index pointer for code point in index
        // euc-kr.
        var pointer = indexPointerFor(code_point, index('euc-kr'));
  
        // 4. If pointer is null, return error with code point.
        if (pointer === null)
          return encoderError(code_point);
  
        // 5. Let lead be floor(pointer / 190) + 0x81.
        var lead = floor(pointer / 190) + 0x81;
  
        // 6. Let trail be pointer % 190 + 0x41.
        var trail = (pointer % 190) + 0x41;
  
        // 7. Return two bytes whose values are lead and trail.
        return [lead, trail];
      };
    }
docs: 14.1.2 euc-kr encoder 
  @constructor
  @implements {Encoder}
  @param {{fatal: boolean}} options