Native codecs extension
Project description
Codecs Extension
This library extends the native codecs
library and provides some new encodings (static or parametrized, like rot-N
or xor-N
).
Codec | Conversions | Comment |
---|---|---|
affine |
text <-> affine ciphertext | aka Affine Cipher |
ascii85 |
text <-> ascii85 encoded text | Python 3 only |
atbash |
text <-> Atbash ciphertext | aka Atbash Cipher |
bacon |
text <-> Bacon ciphertext | aka Baconian Cipher |
barbie-N |
text <-> barbie ciphertext | aka Barbie Typewriter (N belongs to [1, 4]) |
baseXX |
text <-> baseXX | see base encodings |
baudot |
text <-> Baudot code bits | supports CCITT-1, CCITT-2, EU/FR, ITA1, ITA2, MTK-2 (Python3 only), UK, ... |
braille |
text <-> braille symbols | Python 3 only |
dna |
text <-> DNA-N sequence | implements the 8 rules of DNA sequences (N belongs to [1,8]) |
html |
text <-> HTML entities | implements entities according to this reference |
leetspeak |
text <-> leetspeak encoded text | based on minimalistic elite speaking rules |
markdown |
markdown --> HTML | unidirectional |
morse |
text <-> morse encoded text | uses whitespace as a separator |
octal |
text <-> octal digits | dummy octal conversion (converts to 3-digits groups) |
ordinal |
text <-> ordinal digits | dummy character ordinals conversion (converts to 3-digits groups) |
radio |
text <-> radio words | aka NATO or radio phonetic alphabet |
resistor |
text <-> resistor colors | aka resistor color codes |
rot |
text <-> rot(N) ciphertext | aka Caesar cipher (N belongs to [1,25]) |
scytale |
text <-> scytale ciphertext | encrypts with L, the number of letters on the rod (belongs to [1,[) |
shift |
text <-> shift(N) ciphertext | shift ordinals with N (belongs to [1,255]) |
sms |
text <-> phone keystrokes | also called T9 code ; uses "- " as a separator for encoding, "- " or "_ " or whitespace for decoding |
url |
text <-> URL encoded text | aka URL encoding |
xor |
text <-> XOR(N) ciphertext | XOR with a single byte (N belongs to [1,255]) |
whitespace |
text <-> whitespaces and tabs | replaces bits with whitespaces and tabs |
A few variants are also implemented.
Codec | Conversions | Comment |
---|---|---|
baudot-spaced |
text <-> Baudot code groups of bits | groups of 5 bits are whitespace-separated |
baudot-tape |
text <-> Baudot code tape | outputs a string that looks like a perforated tape |
octal-spaced |
text <-> octal digits (whitespace-separated) | dummy octal conversion |
ordinal-spaced |
text <-> ordinal digits (whitespace-separated) | dummy character ordinals conversion |
whitespace_after_before |
text <-> lines of whitespaces[letter]whitespaces | encodes characters as new characters with whitespaces before and after according to an equation described in the codec name (e.g. "whitespace+2*after-3*before ") |
Setup
This library is available on PyPi and can be simply installed using Pip:
$ pip install codext
or
$ pip3 install codext
Note: Some more encodings are available when installing in Python 3.
Usage (from terminal)
$ codext dna-1 -i test.txt
GTGAGCGGGTATGTGA
$ echo -en "test" | codext morse
- . ... -
Python 3 (includes Ascii85, Base85, Base100 and braille):
$ echo -en "test" | codext braille
⠞⠑⠎⠞
$ echo -en "test" | codext base100
👫👜👪👫
Usage (within Python)
Example with Base58:
>>> codext.encode("this is a test", "base58-bitcoin")
'jo91waLQA1NNeBmZKUF'
>>> codext.encode("this is a test", "base58-ripple")
'jo9rA2LQwr44eBmZK7E'
>>> codext.encode("this is a test", "base58-url")
'JN91Wzkpa1nnDbLyjtf'
Example with Base100 (emoji's):
>>> codecs.encode("this is a test", "base100")
'👫👟👠👪🐗👠👪🐗👘🐗👫👜👪👫'
>>> codecs.decode("👫👟👠👪🐗👠👪🐗👘🐗👫👜👪👫", "base100")
'this is a test'
Example with DNA sequence encoding:
>>> for i in range(8):
print(codext.encode("this is a test", "dna-%d" % (i + 1)))
GTGAGCCAGCCGGTATACAAGCCGGTATACAAGCAGACAAGTGAGCGGGTATGTGA
CTCACGGACGGCCTATAGAACGGCCTATAGAACGACAGAACTCACGCCCTATCTCA
ACAGATTGATTAACGCGTGGATTAACGCGTGGATGAGTGGACAGATAAACGCACAG
AGACATTCATTAAGCGCTCCATTAAGCGCTCCATCACTCCAGACATAAAGCGAGAC
TCTGTAAGTAATTCGCGAGGTAATTCGCGAGGTAGTGAGGTCTGTATTTCGCTCTG
TGTCTAACTAATTGCGCACCTAATTGCGCACCTACTCACCTGTCTATTTGCGTGTC
GAGTGCCTGCCGGATATCTTGCCGGATATCTTGCTGTCTTGAGTGCGGGATAGAGT
CACTCGGTCGGCCATATGTTCGGCCATATGTTCGTCTGTTCACTCGCCCATACACT
>>> codext.decode("GTGAGCCAGCCGGTATACAAGCCGGTATACAAGCAGACAAGTGAGCGGGTATGTGA", "dna-1")
'this is a test'
Example with morse:
>>> codecs.encode("this is a test", "morse")
'- .... .. ... / .. ... / .- / - . ... -'
>>> codecs.decode("- .... .. ... / .. ... / .- / - . ... -", "morse")
'this is a test'
>>> with open("morse.txt", 'w', encoding="morse") as f:
f.write("this is a test")
14
>>> with open("morse.txt",encoding="morse") as f:
f.read()
'this is a test'
Example with whitespaces before and after:
>>> codext.decode("""
=
X
:
x
n
r
y
Y
y
p
a
`
n
|
a
o
h
`
g
o
z """, "whitespace-after+before")
'CSC{not_so_invisible}'
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