feat(st-egano): implemented everything lol

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antifallobst 2023-09-15 18:15:10 +02:00
parent 350e23f830
commit 80764ac26a
Signed by: antifallobst
GPG Key ID: 2B4F402172791BAF
4 changed files with 870 additions and 2 deletions

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View File

@ -6,3 +6,6 @@ edition = "2021"
# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
[dependencies]
anyhow = "1.0"
clap = { version = "4.4.2", features = ["derive"] }
image = "0.24.7"

View File

@ -1,3 +1,23 @@
fn main() {
println!("Hello, world!");
mod stegano;
use anyhow::Result;
use clap::Parser;
use std::path::Path;
#[derive(Parser, Debug)]
#[command(author, version, long_about = None)]
struct Args {
/// A image containing a message
file: String,
}
fn main() -> Result<()> {
println!("BWINF 42.1 - <Name Censored> - Junior Aufgabe 2: St. Egano");
let args = Args::parse();
let image = stegano::Image::new(Path::new(&args.file))?;
println!("Hidden Message:\n{}", image.collect::<String>());
Ok(())
}

82
st-egano/src/stegano.rs Normal file
View File

@ -0,0 +1,82 @@
use anyhow::Result;
use image::io::Reader as ImageReader;
use std::path::Path;
#[derive(Debug)]
pub struct Coords {
x: usize,
y: usize,
}
#[derive(Debug)]
pub struct Image {
data: Vec<Vec<RGB>>,
size: Coords,
pos: Coords,
end: bool,
}
#[derive(Debug, Clone)]
struct RGB {
r: u8,
g: u8,
b: u8,
}
impl Coords {
fn new(x: usize, y: usize) -> Self {
Self { x, y }
}
}
impl RGB {
fn black() -> Self {
Self { r: 0, g: 0, b: 0 }
}
}
impl Iterator for Image {
type Item = char;
fn next(&mut self) -> Option<Self::Item> {
if self.end {
return None;
}
let info = self.data[self.pos.y][self.pos.x].to_owned();
self.pos.x = (self.pos.x + info.g as usize) % self.size.x;
self.pos.y = (self.pos.y + info.b as usize) % self.size.y;
if info.g == 0 && info.b == 0 {
self.end = true;
}
Some(info.r as char)
}
}
impl Image {
pub fn new(path: &Path) -> Result<Self> {
let raw_img = ImageReader::open(path)?.decode()?;
let img = raw_img.into_rgb8();
let dimensions = img.dimensions();
let size = Coords::new(dimensions.0 as usize, dimensions.1 as usize);
let mut data = vec![vec![RGB::black(); size.x]; size.y];
for (i, dat) in img.iter().enumerate() {
let idx = i / 3;
match i % 3 {
0 => data[idx / size.x][idx % size.x].r = dat.to_owned(),
1 => data[idx / size.x][idx % size.x].g = dat.to_owned(),
2 => data[idx / size.x][idx % size.x].b = dat.to_owned(),
_ => (),
}
}
Ok(Self {
data,
size,
pos: Coords::new(0, 0),
end: false,
})
}
}