uuencode - format of an encoded uuencode file
Files output by uuencode(1C) consist of a header line, followed by a number of body lines,
and a trailer line. Uudecode(1C) will ignore any lines preceding the header or following
the trailer. Lines preceding a header must not, of course, look like a header.
The header line is distinguished by having the first 6 characters "begin ". The word
begin is followed by a mode (in octal), and a string which names the remote file. A space
separates the three items in the header line.
The body consists of a number of lines, each at most 62 characters long (including the
trailing newline). These consist of a character count, followed by encoded characters,
followed by a newline. The character count is a single printing character, and represents
an integer, the number of bytes the rest of the line represents. Such integers are always
in the range from 0 to 63 and can be determined by subtracting the character space (octal
40) from the character.
Groups of 3 bytes are stored in 4 characters, 6 bits per character. All are offset by a
space to make the characters printing. The last line may be shorter than the normal 45
bytes. If the size is not a multiple of 3, this fact can be determined by the value of
the count on the last line. Extra garbage will be included to make the character count a
multiple of 4. The body is terminated by a line with a count of zero. This line consists
of one ASCII space.
The trailer line consists of "end" on a line by itself.
uuencode(1C), uudecode(1C), uusend(1C), uucp(1C), mail(1)
7th Edition May 15, 1985 UUENCODE(5)