Initial

.gitignore

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+/target

Cargo.lock

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+# This file is automatically @generated by Cargo.
+# It is not intended for manual editing.
+version = 3
+
+[[package]]
+name = "ip2i"
+version = "0.1.0"

Cargo.toml

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+[package]
+name = "ip2i"
+version = "0.1.0"
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]

src/main.rs

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+fn main() {
+    let args: Vec<String> = std::env::args().collect();
+
+    if args.len() < 2 {
+        eprintln!("Missing arguments: <IP>.");
+        std::process::exit(1);
+    }
+
+    let ip_string = &args[1];
+
+    eprintln!("Result: \n{}", ip_to_int(ip_string));
+}
+
+fn ip_to_int(ip_string: &str) -> u32 {
+    let ip_octets: Vec<&str> = ip_string.split('.').collect();
+
+    if ip_octets.len() > 4 {
+        panic!("Invalid IP address: {}.", ip_string);
+    }
+
+    let mut ip_address: u32 = 0;
+
+    for i in 0..4 {
+            let octet: u32 = ip_octets.get(i).unwrap_or(&"0").parse().expect("Not a number.");
+
+            if octet > 254 {
+                panic!("Invalid octet: {}", octet);
+            }
+
+            ip_address = (ip_address << 8) + octet;
+    }
+
+    return ip_address;
+}
+
+#[cfg(test)]
+mod tests {
+    use super::ip_to_int;
+
+    #[test]
+    fn test_ip4octets_should_yield_u32() {
+        assert_eq!(ip_to_int("1.1.1.1"), 16843009);
+        assert_eq!(ip_to_int("10.0.0.1"), 167772161);
+        assert_eq!(ip_to_int("192.168.64.254"), 3232252158);
+        assert_eq!(ip_to_int("131.195.227.142"), 2210653070);
+        assert_eq!(ip_to_int("28.70.183.136"), 474396552);
+        assert_eq!(ip_to_int("186.199.97.154"), 3133628826);
+    }
+
+    #[test]
+    fn test_ip3octets_should_yield_u32() {
+        assert_eq!(ip_to_int("1.1.1"), 16843008);
+        assert_eq!(ip_to_int("10.0.0.0"), 167772160);
+        assert_eq!(ip_to_int("192.168.64.0"), 3232251904);
+        assert_eq!(ip_to_int("131.195.227"), 2210652928);
+        assert_eq!(ip_to_int("28.70.183.0"), 474396416);
+        assert_eq!(ip_to_int("186.199.97"), 3133628672);
+    }
+
+    #[test]
+    fn test_ip2octets_should_yield_u32() {
+        assert_eq!(ip_to_int("1.1.0.0"), 16842752);
+        assert_eq!(ip_to_int("10.0.0"), 167772160);
+        assert_eq!(ip_to_int("192.168"), 3232235520);
+        assert_eq!(ip_to_int("131.195"), 2210594816);
+        assert_eq!(ip_to_int("28.70.0"), 474349568);
+        assert_eq!(ip_to_int("186.199.0.0"), 3133603840);
+    }
+}