FTP ASCII上传下载

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    3.1.1.1. ASCII TYPE

        This is the default type and must be accepted by all FTP
        implementations.  It is intended primarily for the transfer
        of text files, except when both hosts would find the EBCDIC
        type more convenient.

        The sender converts the data from an internal character
        representation to the standard 8-bit NVT-ASCII
        representation (see the Telnet specification).  The receiver
        will convert the data from the standard form to his own
        internal form.

        In accordance with the NVT standard, the <CRLF> sequence
        should be used where necessary to denote the end of a line
        of text.  (See the discussion of file structure at the end
        of the Section on Data Representation and Storage.)

        Using the standard NVT-ASCII representation means that data
        must be interpreted as 8-bit bytes.

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# By default the server will pretend to allow ASCII mode but in fact ignore
# the request. Turn on the below options to have the server actually do ASCII
# mangling on files when in ASCII mode.
# Beware that on some FTP servers, ASCII support allows a denial of service
# attack (DoS) via the command "SIZE /big/file" in ASCII mode. vsftpd
# predicted this attack and has always been safe, reporting the size of the
# raw file.
# ASCII mangling is a horrible feature of the protocol.
#ascii_upload_enable=YES
#ascii_download_enable=YES