write and read with len at first

src/byte_writer.rs

@@ -27,3 +27,22 @@ pub fn string_to_binary(bits: &str) -> Vec<u8> {
 
     bytes
 }
+
+pub fn binary_to_string(bytes: Vec<u8>, len: u32) -> String {
+    let mut binary = String::new();
+    let mut n = 0;
+    for b in bytes {
+        let mut current = b;
+        while n < len && current > 0 {
+            if current % 2 == 1 {
+                binary.push('1');
+            } else {
+                binary.push('0');
+            }
+            current >>= 1;
+            n += 1;
+        }
+    }
+
+    binary
+}

src/main.rs

@@ -6,7 +6,7 @@ use std::io::prelude::*;
 mod byte_writer;
 mod node;
 
-use byte_writer::string_to_binary;
+use byte_writer::{binary_to_string, string_to_binary};
 use node::Node;
 
 fn main() -> std::io::Result<()> {
@@ -26,13 +26,33 @@ fn main() -> std::io::Result<()> {
     let root = node::create_tree(vec);
     eprintln!("root.n = {:#?}", root.n);
 
-    let v = string_to_binary("101");
+    /*
-    //file2.write_all(&v)?;
+        let v = string_to_binary("1010001010101010");
+        let i: u32 = 16;
+        //eprintln!("v = {:?}", v);
+        let len = i.to_be_bytes();
 
-    let mut buffer = Vec::new();
+        eprintln!("v = {:?}", v);
-    file2.read_to_end(&mut buffer)?;
+        eprintln!("len = {:?}", len);
-    eprintln!("v = {:#?}", v);
+        file2.write_all(&len)?;
-    eprintln!("buffer = {:#?}", buffer);
+        file2.write_all(&v)?;
+    */
+
+    let mut buffer = [0u8; 4];
+    file2.read_exact(&mut buffer)?;
+    eprintln!("buffer = {:?}", buffer);
+    let len = u32::from_be_bytes(buffer);
+    eprintln!("len = {:?}", len);
+
+    let mut read = Vec::new();
+    file2.read_to_end(&mut read)?;
+    eprintln!("read = {:?}", read);
+    //let current = read[4..].to_vec();
+    let string = binary_to_string(read, len);
+    eprintln!("string = {:?}", string);
+
+    //eprintln!("v = {:#?}", v);
+    //eprintln!("buffer = {:#?}", buffer);
     //writeln!(file2, "{}", tes;t)?;
     //file2.write_all(&test.to_be_bytes())?;
     //file2.write_all(&[*key as u8])?;