Implement Base64 read.

data/6.txt

@@ -0,0 +1,64 @@
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src/bytes.rs

@@ -1,3 +1,4 @@
+#![allow(dead_code)]
 use std::fmt::Write; // need to import this trait
 
 #[derive(PartialEq, PartialOrd, Debug)]
@@ -34,7 +35,7 @@ impl Bytes {
         let Bytes(v) = self;
         let mut r = String::new();
         for e in v.iter() {
-            write!(r, "{:02x}", e);
+            write!(r, "{:02x}", e).unwrap();
         }
         r
     }

src/bytes_base64.rs

@@ -1,3 +1,4 @@
+#![allow(dead_code)]
 use crate::bytes::Bytes;
 use std::str;
 
@@ -33,6 +34,25 @@ impl BytesBase64 {
         )
     }
 
+    pub fn to_bytes(&self) -> Bytes {
+        Bytes(vec![])
+    }
+
+    pub fn from_base64(s: &str) -> BytesBase64 {
+        let mut r: Vec<u8> = Vec::with_capacity(s.len());
+        for c in s.chars() {
+            match c {
+                'A'..='Z' => r.push((c as u8) - ('A' as u8)),
+                'a'..='z' => r.push((c as u8) - ('a' as u8) + 26),
+                '0'..='9' => r.push((c as u8) - ('0' as u8) + 52),
+                '+' => r.push(62),
+                '/' => r.push(63),
+                _ => (),
+            }
+        }
+        BytesBase64(r)
+    }
+
     pub fn to_string(&self) -> String {
         let BytesBase64(digits) = self;
         let mut r: Vec<u8> = digits

src/main.rs

@@ -3,10 +3,10 @@ mod bytes_base64;
 mod set1;
 
 fn main() {
-    set1::challenge1();
-    set1::challenge2();
-    set1::challenge3();
-    set1::challenge4();
-    set1::challenge5();
+    // set1::challenge1();
+    // set1::challenge2();
+    // set1::challenge3();
+    // set1::challenge4();
+    // set1::challenge5();
     set1::challenge6();
 }

src/set1.rs

@@ -1,7 +1,7 @@
+#![allow(dead_code)]
 use crate::bytes::Bytes;
 use crate::bytes_base64::BytesBase64;
-use std::fs::File;
-use std::io::{BufRead, BufReader};
+use std::io::{BufRead, BufReader, Write};
 use std::str;
 
 pub fn challenge1() {
@@ -37,24 +37,24 @@ pub fn challenge3() {
 }
 
 pub fn challenge4() {
-    pub fn read_to_vector(path: &str) -> Vec<Bytes> {
-        let file = File::open(path).unwrap();
+    fn read(path: &str) -> Vec<Bytes> {
+        let file = std::fs::File::open(path).unwrap();
         let br = BufReader::new(file);
         br.lines()
             .map(|line| Bytes::from_hex(&line.unwrap()))
             .collect()
     }
 
-    let bs = read_to_vector("data/4.txt");
-    let mut h: Vec<Bytes> = vec![];
+    let bytes_vector = read("data/4.txt");
+    let mut xored_bytes_vector: Vec<Bytes> = vec![];
     for i in 32..=127 {
-        for b in bs.iter() {
-            h.push(Bytes::xor_byte(b, i));
+        for bytes in bytes_vector.iter() {
+            xored_bytes_vector.push(Bytes::xor_byte(bytes, i));
         }
     }
-    h.sort_by(|a, b| a.ascii_score().partial_cmp(&b.ascii_score()).unwrap());
-    let r = h[h.len() - 1].to_utf8();
-    println!("[okay] Challenge 4: {}", r.trim());
+    xored_bytes_vector.sort_by(|a, b| a.ascii_score().partial_cmp(&b.ascii_score()).unwrap());
+    let result = xored_bytes_vector.last().unwrap().to_utf8();
+    println!("[okay] Challenge 4: {}", result.trim());
 }
 
 pub fn challenge5() {
@@ -72,6 +72,28 @@ pub fn challenge5() {
 }
 
 pub fn challenge6() {
-    // next: base64bytes to hexbytes
-    println!("[open] Challenge 6: xxx");
+    fn read(path: &str) -> BytesBase64 {
+        let s = std::fs::read_to_string(path).unwrap();
+        BytesBase64::from_base64(&s)
+    }
+
+    fn write(path: &str, bytes_base64: &BytesBase64) {
+        let width = 60;
+        let bytes = bytes_base64.to_string();
+        let mut output_vec = vec![];
+
+        for e in Iterator::zip(bytes.as_bytes().iter(), 0..bytes.len()) {
+            if e.1 % width == 0 && e.1 > 0 {
+                output_vec.push('\n' as u8)
+            }
+            output_vec.push(*e.0);
+        }
+
+        let mut f = std::fs::File::create(path).unwrap();
+        f.write(&output_vec).unwrap();
+    }
+
+    let bytes_base64 = read("data/6.txt");
+    write("data/6_out.txt", &bytes_base64);
+    println!("[open] Challenge 6");
 }