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Add encode and decode function

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Signed-off-by: trivernis <trivernis@protonmail.com>
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trivernis 3 years ago
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.gitignore vendored
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/target
Cargo.lock
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test

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Cargo.toml
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[package]
name = "uwucodec"
version = "0.1.0"
edition = "2018"
license = "Apache-2.0"
authors = ["trivernis <trivernis@protonmail.com>"]
description = "Encode your data into uwu and back."
repository = "https://github.com/Trivernis/uwucodec"
readme = "README.md"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
structopt = "0.3.22"

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LICENSE
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README.md
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# UWU-Codec
I'm sorry.
## Motivation
Do you also think hexadecimal byte encoding is boring? Do you want more uwu in your life?
This program solves both of your problems. Bytes are encoded into two words according to
the following mapping:
| nibble | word |
|--------|------|
| 0000 | uwu
| 0001 | owo
| 0010 | umu
| 0011 | nya
| 0100 | omo
| 0101 | o_o
| 0110 | q_p
| 0111 | u_u
| 1000 | o~o
| 1001 | UwU
| 1010 | OwO
| 1011 | UmU
| 1100 | OmO
| 1101 | O_O
| 1110 | U_U
| 1111 | Nya
## Usage
Use the `uwuencode` and `uwudecode` binaries like this:
```
uwuencode path/to/raw/input path/to/encoded/output
uwudecode path/to/encoded/input path/to/raw/output
```
You can also use the functions in your project to spice things up:
```rust
use uwucodec::encode;
fn main() {
let encoded = encode(&"Hello World".as_bytes());
let decoded = decode(&encoded);
}
```
## License
Apache-2.0

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src/bin/uwudecode.rs
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use std::fs::{read_to_string, write};
use std::io;
use std::path::PathBuf;
use structopt::StructOpt;
use uwucodec::decode;
#[derive(StructOpt, Debug)]
#[structopt()]
struct Opt {
/// The uwuencoded file
#[structopt(parse(from_os_str))]
input: PathBuf,
/// The file to write the decoded output to
#[structopt(parse(from_os_str))]
output: PathBuf,
}
fn main() -> io::Result<()> {
let opt: Opt = Opt::from_args();
let encoded_data = read_to_string(opt.input)?;
let data = decode(&encoded_data);
write(opt.output, data)
}

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src/bin/uwuencode.rs
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use std::fs::{read, write};
use std::io;
use std::path::PathBuf;
use structopt::StructOpt;
use uwucodec::encode;
#[derive(StructOpt, Debug)]
#[structopt()]
struct Opt {
/// The input file with the data to encode
#[structopt(parse(from_os_str))]
input: PathBuf,
/// The file to write the uwuencoded data to
#[structopt(parse(from_os_str))]
output: PathBuf,
}
fn main() -> io::Result<()> {
let opt: Opt = Opt::from_args();
let data = read(opt.input)?;
let encoded_data = encode(&data);
write(opt.output, encoded_data)
}

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src/lib.rs
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//! This crate provides an encoding from byte to uwu and back.
//! Encode:
//! ```
//! use uwucodec::encode;
//!
//! fn main() {
//! println!("Hello World in uwu is: {}", encode("Hello World".as_bytes()));
//! }
//! ```
//!
//! Decode:
//! ```
//! use uwucodec::decode;
//! fn main() {
//! let text = "omo o~o q_p o_o q_p OmO q_p OmO q_p Nya umu uwu o_o u_u q_p Nya u_u umu q_p OmO q_p omo";
//! println!("{} is {:?}", text, decode(text));
//! }
//! ```
use std::cell::RefCell;
use std::collections::HashMap;
static VALUE_MAPPINGS: [&str; 16] = [
"uwu", "owo", "umu", "nya", "omo", "o_o", "q_p", "u_u", "o~o", "UwU", "OwO", "UmU", "OmO",
"O_O", "U_U", "Nya",
];
thread_local! { static WORD_MAP: RefCell<HashMap<&'static str, u8>> = RefCell::new(get_word_map()); }
static SEPARATOR: &str = " ";
/// Encodes into the best encoding in existence
pub fn encode<'a, I: IntoIterator<Item = &'a u8> + 'a>(data: I) -> String {
data.into_iter()
.map(|b| encode_byte(*b))
.flatten()
.collect::<Vec<&'static str>>()
.join(SEPARATOR)
}
fn encode_byte(byte: u8) -> [&'static str; 2] {
[
VALUE_MAPPINGS[(byte >> 4) as usize],
VALUE_MAPPINGS[(byte & 15) as usize],
]
}
/// Decodes the best encoding in existence back into bytes
pub fn decode<S: AsRef<str>>(encoded_data: S) -> Vec<u8> {
let mut data = Vec::new();
let mut words = encoded_data.as_ref().split(SEPARATOR);
loop {
let byte = if let (Some(head), Some(tail)) = (words.next(), words.next()) {
[head, tail]
} else {
break;
};
data.push(decode_byte(byte))
}
data
}
fn decode_byte(enc_byte: [&str; 2]) -> u8 {
(decode_word(enc_byte[0]) << 4) | decode_word(enc_byte[1])
}
fn decode_word(word: &str) -> u8 {
WORD_MAP.with(|m| *m.borrow().get(word).unwrap_or(&0u8))
}
fn get_word_map() -> HashMap<&'static str, u8> {
let mut value_map = HashMap::with_capacity(VALUE_MAPPINGS.len());
for i in 0..VALUE_MAPPINGS.len() {
value_map.insert(VALUE_MAPPINGS[i], i as u8);
}
value_map
}
#[cfg(test)]
mod tests {
use crate::{decode, encode};
#[test]
fn it_encodes() {
let data = vec![0u8, 16u8, 12u8];
let encoded = encode(&data);
assert_eq!(encoded, String::from("uwu uwu owo uwu uwu OmO"))
}
#[test]
fn it_decodes() {
let encoded_data = String::from("uwu uwu owo uwu uwu OmO");
let decoded = decode(encoded_data);
assert_eq!(decoded, vec![0u8, 16u8, 12u8])
}
#[test]
fn it_encodes_100000() {
let data = vec![0u8, 16u8, 12u8];
for _ in 0..100000 {
let encoded = encode(&data);
assert_eq!(encoded, String::from("uwu uwu owo uwu uwu OmO"))
}
}
#[test]
fn it_decodes_100000() {
let encoded_data = String::from("uwu uwu owo uwu uwu OmO");
for _ in 0..100000 {
let decoded = decode(&encoded_data);
assert_eq!(decoded, vec![0u8, 16u8, 12u8])
}
}
}
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