code: public void fax4Encode(byte[] data, int offset, int size) {
          dataBp = data;
          offsetData = offset;
          sizeData = size;
          while (sizeData > 0) {
              Fax3Encode2DRow();
              System.arraycopy(dataBp, offsetData, refline, 0, rowbytes);
              offsetData += rowbytes;
              sizeData -= rowbytes;
          }
      }
docs: Encodes a number of lines.
  @param data the data to be encoded
  @param offset the offset into the data
  @param size the size of the data to be encoded