Documentation & replace hex_to_char to hex_to_string

set1/chal1/src/main.rs

@@ -6,19 +6,34 @@
 
 use std::env;
 
-/// Convert Hex String to char
+/// Convert Hexadecimal Vec<String> to String
 ///
 /// # Examples
 ///
 /// ~~~
-/// hex_to_char("49") => I
+/// hex_to_string("49") => I
 /// ~~~
-/// TODO: the name is not accurate. Take a string and convert to u8
-fn hex_to_char(s: &str) -> Result<char, std::num::ParseIntError> {
-  u8::from_str_radix(s, 16).map(|n| n as char)
+fn hex_to_string(hex_char: &Vec<String>) -> String {
+  let mut output = String::new();
+  // Printing the string in Ascii format - for hexa to Ascii example
+  for (i, s) in hex_char.into_iter().enumerate() {
+    match u8::from_str_radix(&s, 16).map(|n| n as char) {
+      Ok(s) =>  output.push(s),
+      Err(e) => println!("\nError decoding char '{}' at index {}", e, i),
+    }
+  }
+  output
 }
 
 /// Encode a Vector of bytes to Base64 and return the base 64 String
+///
+/// # Examples
+///
+/// ~~~
+///  let test: Vec<u8> = vec![0x41, 0x42];
+///  let b64_encode = base64_encode(&test);
+///  assert_eq!(b64_encode, "QUI=");
+/// ~~~
 fn base64_encode(input: &Vec<u8>) -> String {
   static BASE64_TABLE: &'static [char] = &['A','B','C','D','E','F', 'G', 'H',
                                            'I', 'J', 'K', 'L', 'M', 'N', 'O',
@@ -76,7 +91,11 @@ fn base64_encode(input: &Vec<u8>) -> String {
 }
 
 fn main() {
-  let mut input_str = String::new();
+  // Test Base64 encode
+  let test: Vec<u8> = vec![0x41, 0x42]; // "[A,B] in ascii"
+  let b64_encode = base64_encode(&test);
+  assert_eq!(b64_encode, "QUI=");
+
   let args: Vec<String> = env::args().collect();
   let input = &args[1];
 
@@ -86,13 +105,7 @@ fn main() {
     .map(|chunk| chunk.iter().collect::<String>())
     .collect::<Vec<_>>();
 
-  // Printing the string in Ascii format - for hexa to Ascii example
-  for (i, s) in hex_char.into_iter().enumerate() {
-    match hex_to_char(s) {
-      Ok(s) =>  input_str.push(s),
-      Err(e) => println!("\nError decoding char '{}' at index {}", e, i),
-    }
-  }
+  let input_str = hex_to_string(&hex_char);
 
   // Convert hex_char : Vec<String> into Vec<u8>
   // Warning: Panic if not base16