Re: lun - Lucky Number

Richard Heathfield wrote:

On 08/03/2025 19:11, Stefan Claas wrote:

Well, Rich (and maybe you) should also show things to the community here,
which can be discussed, otherwise this place is getting pretty boring.

 
Okay. How about a new primitive? (I /think/ it's new, but of course
there's nothing new under the sun so I might be mistaken.)
 
Take 8 consecutive bytes, imagine them as a square of 8x8 bits, and
'tumbleweed' the bits clockwise.
 
That is, turn this:
 
     abcdefgh
     ijklmnop
     qrstuvwx
     yzABCDEF
     GHIJKLMN
     OPQRSTUV
     WXYZ0123
     456789+=
 
to this:
 
     4WOGyqia
     5XPHzrjb
     6YQIAskc
     7ZRJBtld
     80SKCume
     91TLDvnf
     +2UMEwog
     =3VNFxph
 
The inverse is of course to tumbleweed them anticlockwise.
 
Sort of gives a new spin to bit rotation.
 

This is a really nice idea! :-) I called my program 'spiro' since
it gives a 'spiral' like output. To fill the matrix properly it
uses padding.

$ spiro -h
Usage: spiro [OPTIONS] [TEXT]

Options:
  -m SIZE    Matrix size (must be power of 2, default: 8)
  -r DEG     Rotation degree (90, 180, 270, default: 90)
  -f FILE    Output/Input file name (optional for encoding)
  -d         Decode mode (requires -f)

Examples:
  spiro -m 8 -r 90 "Hello World"
  spiro -m 8 -r 90 -f encoded.txt "Hello World"
  spiro -m 8 -d -f encoded.txt
  echo "Long text" | spiro -m 16 -r 90

$ echo ThankyouRichardfortheniceideathisisreallyfun | spiro -f out.txt
Encoded matrix:

niceideT
entwE3ah
huZg3Jta
tfKvffhn
ryQo9mik
ol36p8sy
flaersio
drahciRu

$ spiro -d -m 8 -f out.txt
Decoded text: ThankyouRichardfortheniceideathisisreallyfuntwE3Jfm8p63QKZg3f9ov

Regards
Stefan

--
Onion Courier Home Server Mon-Fri 15:00-21:00 UTC Sat-Sun 11:00-21:00 UTC
ohpmsq5ypuw5nagt2jidfyq72jvgw3fdvq37txhnm5rfbhwuosftzuyd.onion:8080 inbox
 age1yubikey1qv5z678j0apqhd4ng7p22g4da8vxy3q5uvthg6su76yj0y8v7wp5kvhstum