diff --git a/README.md b/README.md
index 048bd35..d7df67b 100644
--- a/README.md
+++ b/README.md
@@ -1 +1,9 @@
 # Œufman
+
+## Arrangement in the file
+```
+Size header -> u32
+Size tree -> u32
+Tree -> {<1, Node>, <0, leaf>}
+```
+
diff --git a/src/byte_writer.rs b/src/byte_writer.rs
index a2f3afa..3bf4803 100644
--- a/src/byte_writer.rs
+++ b/src/byte_writer.rs
@@ -28,10 +28,11 @@ pub fn string_to_binary(bits: &str) -> Vec<u8> {
     bytes
 }
 
-pub fn binary_to_string(bytes: Vec<u8>, len: u8) -> String {
+pub fn binary_to_string(bytes: Vec<u8>, len: u32) -> String {
     let mut binary = String::new();
     //bytes.reverse();
     let mut word = String::new();
+    let mut n = 0;
     for b in &bytes {
         let current = *b;
         for i in 0..8 {
@@ -43,9 +44,10 @@ pub fn binary_to_string(bytes: Vec<u8>, len: u8) -> String {
         }
         binary = binary + &word;
         word = String::new();
-    }
-    for _ in 0..8 - len {
-        binary.pop();
+        n += 1;
+        if n >= len {
+            break;
+        }
     }
 
     binary
diff --git a/src/main.rs b/src/main.rs
index 2edfd92..c99e989 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -7,32 +7,105 @@ mod byte_writer;
 mod node;
 
 use byte_writer::{binary_to_string, string_to_binary};
-use node::{Node, read_tree, tree_to_string};
+use node::{Node, create_tree, read_tree, tree_to_string};
 
 fn main() -> std::io::Result<()> {
     let args: Vec<String> = env::args().collect();
 
-    // Afficher les arguments
     println!("Arguments passés au programme :");
     for (index, arg) in args.iter().enumerate() {
         println!("Argument {}: {}", index, arg);
     }
 
-    let file = File::open("test.txt")?;
+    let request = args.get(1).map(|s| s.to_string());
+
+    match request {
+        Some(r) => {
+            if r == "compress" || r == "c" {
+                let file_name = args.get(2).map(|s| s.to_string());
+                match file_name {
+                    Some(f) => {
+                        let to_compress = File::open(&f)?;
+                        let mut after_compression = File::create(f + ".oeuf")?;
+                        let map = get_map_file(&to_compress)?;
+                        let nodes = nodes_at_vec(map);
+                        let mut tree = create_tree(nodes);
+                        let (str_bin, chars) = tree_to_string(&mut tree);
+                        let binary = string_to_binary(&str_bin);
+                        let len_tree: u32 = str_bin.len() as u32;
+                        let string: String = chars.iter().collect();
+                        after_compression.write_all(
+                            &(len_tree + (string.as_bytes().len() as u32) * 8).to_be_bytes(),
+                        )?;
+                        after_compression.write_all(&len_tree.to_be_bytes())?;
+                        after_compression.write_all(&binary)?;
+                        after_compression.write_all(string.as_bytes())?;
+                    }
+                    None => {
+                        println!("No file name!");
+                        display_options();
+                    }
+                }
+            } else if r == "print" || r == "p" {
+                let file_name = args.get(2).map(|s| s.to_string());
+                match file_name {
+                    Some(f) => {
+                        let mut to_print = File::open(f)?;
+                        let mut buffer = [0u8; 4];
+                        to_print.read_exact(&mut buffer)?;
+                        eprintln!("buffer = {:?}", buffer);
+                        let mut len_head = u32::from_be_bytes(buffer);
+                        to_print.read_exact(&mut buffer)?;
+                        eprintln!("buffer = {:?}", buffer);
+                        let len_tree = u32::from_be_bytes(buffer);
+                        eprintln!("len_head = {:?}", len_head);
+                        eprintln!("len_tree = {:?}", len_tree);
+
+                        let len_chars = len_head - len_tree;
+                        eprintln!("len_chars = {:?}", len_chars);
+                        let tree_bin = read_n_bytes(&mut to_print, len_tree);
+                        eprintln!("tree_bin = {:?}", tree_bin);
+                        let tree_str = binary_to_string(tree_bin, len_tree);
+                        eprintln!("tree_str = {:?}", tree_str);
+
+                        let chars_bin = read_n_bytes(&mut to_print, len_chars);
+                        eprintln!("chars_bin = {:?}", &chars_bin);
+                        let chars_str = String::from_utf8(chars_bin).unwrap();
+                        eprintln!("tree_str = {:?}", tree_str);
+                        eprintln!("chars_str = {:?}", chars_str);
+                        //let mut root = read_tree(&tree_str, &chars_str.chars().collect());
+                        //let txt = tree_to_string(&mut root);
+                        //eprintln!("txt = {:?}", txt);
+                    }
+                    None => {
+                        println!("No file name!");
+                        display_options();
+                    }
+                }
+            }
+        }
+        None => {
+            println!("No argument to deal with !");
+            display_options();
+        }
+    }
+
+    //let file = File::open("test.txt")?;
     //let mut file2 = File::open("fo.txt")?;
 
-    let map = get_map_file(file).expect("Failed to load!");
-    let vec = nodes_at_vec(map);
-    let mut root = node::create_tree(vec);
+    //let map = get_map_file(file).expect("Failed to load!");
+    //let vec = nodes_at_vec(map);
+    //let mut root = node::create_tree(vec);
     //eprintln!("root.n = {:#?}", root.l.unwrap().n);
-    let txt = tree_to_string(&mut root);
+    //let txt = tree_to_string(&mut root);
     //eprintln!("txt = {:?}", txt);
+    /*
     let mut root2 = read_tree(&txt.0, &txt.1);
     eprintln!(
         "root2.l.unwrap().l.unwrap().val = {:?}",
         root2.l.unwrap().l.unwrap().val
     );
-
+    */
     /*
     let binary = "101100001";
     let mut v = string_to_binary(binary);
@@ -70,7 +143,13 @@ fn main() -> std::io::Result<()> {
     Ok(())
 }
 
-fn get_map_file(mut file: File) -> Result<HashMap<char, i32>, std::io::Error> {
+fn display_options() {
+    println!("compress <file>   | c <file>     To compress a file.");
+    println!("uncompress <file> | u <file>     To compress a file.");
+    println!("print <file>      | p <file>     To print a file compressed.");
+}
+
+fn get_map_file(mut file: &File) -> Result<HashMap<char, i32>, std::io::Error> {
     let mut hashmap: HashMap<char, i32> = HashMap::new();
     let mut contents = String::new();
     file.read_to_string(&mut contents)?;
@@ -93,3 +172,18 @@ fn nodes_at_vec(map: HashMap<char, i32>) -> Vec<Node> {
     nodes.sort_by(|a, b| a.val.cmp(&b.val));
     nodes
 }
+
+fn read_n_bytes(file: &mut File, len: u32) -> Vec<u8> {
+    let mut n = 0;
+    let mut out: Vec<u8> = Vec::new();
+    let mut buffer = [0u8, 1];
+    loop {
+        let _ = file.read_exact(&mut buffer);
+        out.push(buffer[0]);
+        n += 8;
+        if n >= len {
+            break;
+        }
+    }
+    out
+}
diff --git a/test.txt.oeuf b/test.txt.oeuf
new file mode 100644
index 0000000..5c823a0
Binary files /dev/null and b/test.txt.oeuf differ