improving

src/hex.rs

@@ -2,10 +2,24 @@
 
 
 pub fn get_hex(x: u8) -> char {
-    const LUTABLE: [char; 16] = 
+    const LU_TABLE: [char; 16] = 
         ['0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D',
         'E', 'F'];
 
-    LUTABLE[x as usize]
+    LU_TABLE[x as usize]
+}
+
+pub fn hex_pair(x: u8) -> (char, char) {
+    (get_hex((x & 0xF0) >> 4), get_hex(x & 0x0F))
+}
+
+pub fn to_line(data: &[u8]) -> String {
+    let mut out = String::new();
+    for byte in data {
+        let pair = hex_pair(*byte);
+        out.push(pair.0);
+        out.push(pair.1);
+    }
+    out
 }
 

src/main.rs

@@ -1,8 +1,16 @@
+use std::io::{self, Read};
 
 pub mod hex;
 
 fn main() {
-    println!("Hello: {}", hex::get_hex(12));
+    let stdin = std::io::stdin();
+    let mut input = stdin.lock();
+
+    while true {
+        let mut buffer: [u8; 64] = [0; 64];
+        let read = input.read(&mut buffer);
+        println!("{}", hex::to_line(&buffer));
+    }
 }