Compress is working, I guess. Need to fix decompress to validate.

src/main.rs

@@ -1,13 +1,22 @@
+use std::env;
+use std::fs;
+use std::io::BufReader;
+use std::io::prelude::*;
 use std::i32;
 
 
 fn main() {
-    let buf = "Hello world!";
+    let output_filename = env::args().nth(1).unwrap();
+    let mut output_file = fs::File::create(output_filename).unwrap();
+
+    let input_filename = env::args().nth(2).unwrap();
+    let input_file = fs::File::open(input_filename).unwrap();
+    let input_buf = BufReader::new(input_file);
 
     let mut i : i32 = 0;
 
-    for b in buf.chars() {
-        println!("{:?}", b);
+    for b in input_buf.bytes() {
+        let b = b.unwrap();
 
         for n in 0..i32::MAX {
             if b == get_byte(n) {
@@ -16,11 +25,11 @@ fn main() {
             }
         }
 
-        println!("{}", i);
+        output_file.write(&[i as u8]).unwrap();
     }
 }
 
-fn get_byte(id: i32) -> char {
+fn get_byte(id: i32) -> u8 {
     let pid : f64 = 4.0 * series(1, id) - 2.0 * series(4, id) - series(5, id) - series(6, id);
 
     let mut y : f64 = (pid - (pid as i32) as f64 + 1.0).abs();
@@ -33,7 +42,7 @@ fn get_byte(id: i32) -> char {
 
     let second : u8 = y as u8;
 
-    ((first << 4) | second) as char
+    (first << 4) | second
 }
 
 fn series(m: i32, id: i32) -> f64 {