FTP協議中的轉義字符

Question

我目前在我的一個項目（ftp客戶端部分）上實現了ftp協議。我正在遵循RFC959

在這個RFC中，我面臨一個問題：轉義字符，的確，它描述了它必須使用轉義字符。但我不知道具體角色是什麼。

以下是有關轉義字符的RFC的一部分：

 3.4.1. STREAM MODE 

    The data is transmitted as a stream of bytes. There is no 
    restriction on the representation type used; record structures 
    are allowed. 

    In a record structured file EOR and EOF will each be indicated 
    by a two-byte control code. The first byte of the control code 
    will be all ones, the escape character. The second byte will 
    have the low order bit on and zeros elsewhere for EOR and the 
    second low order bit on for EOF; that is, the byte will have 
    value 1 for EOR and value 2 for EOF. EOR and EOF may be 
    indicated together on the last byte transmitted by turning both 
    low order bits on (i.e., the value 3). If a byte of all ones 
    was intended to be sent as data, it should be repeated in the 
    second byte of the control code. 

    If the structure is a file structure, the EOF is indicated by 
    the sending host closing the data connection and all bytes are 
    data bytes. 

有誰知道是什麼性格？

一般來說，你有一些關於如何告訴FTP服務器我已經完成發送文件的線索嗎？

先謝謝您。 「

Answer 1

」控制代碼的第一個字節將是所有1，轉義字符。「 - 換句話說 - 0xff