Method append

fdbclient/BackupContainerLocalDirectory.actor.cpp:42–50

	}

	Future<Void> append(const void* data, int len) override {
		m_buffer.append(m_buffer.arena(), (const uint8_t*)data, len);

		if (m_buffer.size() >= m_blockSize) {
			return flush(m_blockSize);
		}

		return Void();
	}

	Future<Void> flush(int size) {
		// Avoid empty write