SDN¹ Plus/SDN1_.cdr/sdn/misc2/uuexe510.sda

Text File | 1992-04-05 | 1.7 KB | 42 lines

UUENCODE 5.10 RICHARD MARKS Registration $ freeware
MISC FEB92 ENCODE DECODE FILES CHARACTERS MARKS
FILES uuexe510.sdn

UU-encoding is  a way to  code a file  which may contain  any
characters into a standard character set that can be reliably
sent over diverse networks.


THE CHARACTER ENCODING:

The basic scheme is to break groups of 3 eight bit characters
(24 bits) into 4 six bit characters and then add 32 (a space)
to  each six  bit character  which maps  it into  the readily
transmittable character.  Another way of phrasing  this is to
say  that the  encoded 6  bit characters  are mapped into the
set:

        `!"#$%&'()*+,-./012356789:;<=>?@ABC...XYZ[\]^_
for transmission over communications lines.

As  some transmission  mechanisms compress  or remove spaces,
spaces  are changed  into  back-quote  characters (a  96). (A
better scheme  might be to use  a bias of 33  so the space is
not created, but this is not done.)

In  previous  versions  (4.13   and  lower)  the  line  check
characters was  generated by default  by this encode  program
and was supressed with the "-L" option. One reason to supress
them  is if  they will  be decoded  by one  of the old Horton
decoders. Most  decoders either accept this  form of check or
simply stop  looking after the  line length is  exhausted. My
feelings are mixed about the line checksums because errors of
this type essentially never occur.

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(SDA Format (c)Copyright 1992 The SDN Project - SDNet/Works!)
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