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Uuencoding
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Uuencoding : ウィキペディア英語版
Uuencoding
Uuencoding is a form of binary-to-text encoding that originated in the Unix program uuencode, for encoding binary data for transmission over the UUCP mail system.
The name "uuencoding" is derived from "Unix-to-Unix encoding". Since UUCP converted characters between various computers' character sets, uuencode was used to convert data that should not be translated between character sets. By encoding such data into a character subset common to most character sets, the encoded form of such data files was unlikely to be "translated", thereby destroying the file. The program uudecode reverses the effect of uuencode, recreating the original binary file exactly. uuencode/decode became popular for sending binary files by e-mail and posting to usenet newsgroups, etc.
It has now been largely replaced by MIME and yEnc. With MIME, files that might have been uuencoded are transferred with base64 encoding.
==Encoded format==
A uuencoded file starts with a header line of the form:
begin
is the file's Unix file permissions as three octal digits (e.g. 644, 744). This is typically only significant to unix-like operating systems.
is the file name to be used when recreating the binary data.
signifies a newline character, used to terminate each line.
Each data line uses the format:

is a character indicating the number of data bytes which have been encoded on that line. This is an ASCII character determined by adding 32 to the actual byte count, with the sole exception of a grave accent "`" (ASCII code 96) signifying zero bytes. All data lines except the last (if the data was not divisible by 45), have 45 bytes of encoded data (60 characters after encoding). Therefore, the vast majority of length values is 'M', (32 + 45 = ASCII code 77 or "M").
are encoded characters. See Formatting Mechanism for more details on the actual implementation.
The file ends with two lines:
`
end
The second to last line is also a character indicating the line length with the grave accent signifying zero bytes.
As a complete file, the uuencoded output for a plain text file named cat.txt containing only the characters ''Cat'' would be
begin 644 cat.txt
#0V%T
`
end
The begin line is a standard uuencode header; the '#' indicates that its line encodes three characters; the last two lines appear at the end of all uuencoded files.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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