code: private void writeByChunk(final byte[] bytes) throws IOException {
  
          final int chunkSize = this.chunkSize;
  
          if (bytes.length == 0) {
              return;
          }
  
          if (chunkSize < bytes.length && chunkSize > 0) {
  
              int remaining = bytes.length;
  
              int offset = 0;
  
              while (remaining > 0) {
                  if (chunkSize < remaining) {
                      os.write(bytes, offset, chunkSize);
                      remaining -= chunkSize;
                      offset += chunkSize;
                  } else {
                      os.write(bytes, offset, remaining);
                      remaining = 0;
                  }
              }
  
          } else {
              os.write(bytes);
          }
      }
docs: writes maximum bytes at chuckSize
  
  @param bytes
  @throws IOException
  @since 1.1.2
  @author WFF