Index of /dee/software/ST/compress
Name Last modified Size Description
Parent Directory -
CE.DEF.txt 2022-09-25 21:57 345
CE.m2.txt 2022-09-25 21:57 744
README.html 2022-09-25 21:57 1.3K
SHA256.txt 2022-09-25 21:57 79
compress.exe 2022-09-25 21:57 38K
compress.m2.txt 2022-09-25 21:57 829
variations.m2.txt 2022-09-25 21:57 625
PROGRAM
compress: compress input by encoding repeated characters
USAGE
compress
DESCRIPTION
compress copies its input to its output, replacing strings of four or more
identical characters by a code sequence so that the output generally contains
fewer characters than the input. A run of 'x's is encoded as ~nx where the
count n is a character: '1' calls for a repetition of one x, '2' a repetition
of two 'x's, and so on. Runs longer than 73 are broken into several shorter
ones. Runs of '~'s of any length are encoded.
EXAMPLE
C:\>compress
Item Name Value
Item~4 Name~9 Value
1 car ~$7,000.00
1~7 car~: ~1~$7,000.00
^Z
BUGS
The implementation assumes 73 legal characters beginning with '1' and ending
with ASCII 'z'. Some non-alpha or numeric characters are used.
For some reason, the above example interactively does not seem to work: the
newlines from pressing Enter are not recognized. When taken from a file,
they're processed, but the output does not complete on a separate line,
(especially when waiting for input).
This is a problem using Free Pascal with the original Pascal tools tape, as
well as ADW and gm2 (Windows 10 Pro 64-bit and GNU/Linux with Bash). The
example above is thus what is intended, not what actually occurs.