private void writeTrailer(byte[] paramArrayOfByte, int paramInt) throws IOException {
        writeInt((int) this.crc.getValue(), paramArrayOfByte, paramInt);
        writeInt(this.def.getTotalIn(), paramArrayOfByte, paramInt + 4);
      }
re-implement because the relative method in jdk is invisible
hbase-common/src/main/java/org/apache/hadoop/hbase/io/compress/ReusableStreamGzipCodec.java