Sent file in blocksize

server.java

// TODO: FILE_BYTES_REQUEST

for (int initial_position = 0; initial_position < qq.fileDescriptor.fileSize; ) {
  long offset = 0;
  long remained = qq.fileDescriptor.fileSize - initial_position;

  if (remained > blockSize) {
    offset = blockSize;
  } else {
    offset = remained;
  }
  ByteBuffer content = fileSystemManager.readFile(qq.fileDescriptor.md5, initial_position, offset);
  String encoded = Base64.getEncoder().encodeToString(content.array());
  //TODO: sent encode buffer
  initial_position += offset;
}