pkstrings: convert example

Signed-off-by: Maxime “pep” Buquet <pep@bouah.net>

pkstrings/examples/convert.rs

@@ -0,0 +1,52 @@
+// Copyright (C) 2020 "Maxime “pep” Buquet <pep@bouah.net>"
+//
+// This program is free software: you can redistribute it and/or modify it
+// under the terms of the GNU Affero General Public License as published by the
+// Free Software Foundation, either version 3 of the License, or (at your
+// option) any later version.
+//
+// This program is distributed in the hope that it will be useful, but WITHOUT
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License
+// for more details.
+//
+// You should have received a copy of the GNU Affero General Public License
+// along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+use std::env::args;
+use std::convert::TryFrom;
+use std::process::exit;
+
+use pkstrings::PKString;
+
+fn main() {
+    let args: Vec<String> = args().collect();
+
+    if args.len() < 2 {
+        eprintln!("usage: {} <ascii>|rev <hex>", args[0]);
+        exit(1);
+    }
+
+    if args.len() == 2 {
+        // Convert String to PKString and then to Vec<u8>
+        let tmp: Vec<u8> = PKString::try_from(args[1].clone()).unwrap().into();
+        println!("{:#02x?}", tmp);
+    } else if args.len() == 3 && args[1] == String::from("rev") {
+        // Consure chars 2 by 2 and convert to u8.
+        let mut vec: Vec<u8> = vec![];
+
+        args[2].chars().fold(vec![], |mut acc, chr| {
+            acc.push(chr);
+
+            if acc.len() == 2 {
+                let ord = format!("{}{}", acc[0], acc[1]);
+                vec.push(u8::from_str_radix(&ord, 16).unwrap());
+                acc = vec![];
+            }
+
+            acc
+        });
+
+        println!("{}", PKString::try_from(vec.as_slice()).unwrap());
+    }
+}