xor a potato

xor-potato

use std::io::prelude::*;
use std::fs::File;
 
 
fn main() {
    let mut f = File::open("./potato").unwrap();
    let mut inbuffer = Vec::new();
    // read the whole file
    f.read_to_end(&mut inbuffer);
 
    for i in 0..inbuffer.len() {
        inbuffer[i] ^= 82;
    }
 
    let mut outbuffer = File::create("out").unwrap();
    write_data(&mut outbuffer, &inbuffer);
}
 
fn write_data(buffer: &mut File, data: &[u8])
{
    let mut pos = 0;
    while pos < data.len() {
        let bytes_written = buffer.write(&data[pos..]).unwrap();
        pos += bytes_written;
    }
}