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FTP Data Representation: Data Types, Data Structures and Format Control
(Page 3 of 3)
FTP Format Control
For the ASCII and EBCDIC types, FTP
defines an optional parameter called format control. This allows
a user to specify a particular representation for how vertical formatting
is used to describe a file. The three options are:
- Non Print: The default, indicating no
- Telnet Format: Indicates that vertical
format control characters, as specified in the Telnet protocol, are
used in this file.
- Carriage Control / FORTRAN: The file uses
format control characters given as the first character of each line,
as specified for the FORTRAN programming language.
The format control option was created
for the particular purpose of properly handling files transferred from
host devices to printers. It is not used today, to my knowledge (or
if it is used, it is only in special applications.)
FTP Data Structures
In addition to specifying a file's
data type, it is also possible to specify the file's data structure.
There are three possibilities:
- File Structure: The file is a contiguous
stream of bytes with no internal structure.
- Record Structure: The file consists of
a set of sequential records, each of which is delimited by an end-of-record
- Page Structure: The file contains a set
of special indexed data pages.
The file structure is the
default and is used for most types of files. The record structure
can be used for ASCII text files, but these are more commonly sent with
the regular file structure using the ASCII data type.
The page structure is not commonly used; I believe it was initially
created for a now archaic type of computer used in the early ARPAnet.
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The TCP/IP Guide (http://www.TCPIPGuide.com)
Version 3.0 - Version Date: September 20, 2005
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