use std::io::{self, BufRead, stdout, Write};

fn dump_to_bin(line: String) {
    let words: Vec<&str>  = line.split("  ").collect();

    if words.len() == 2 {
        let iter = words[0].split_whitespace();
        let data: Vec<&str> = iter.skip(1).collect();
        let hex: String = data.join("");

        let bytes = hex::decode(hex).unwrap();
        let u8_values: Vec<u8> = bytes.iter().map(|b| *b).collect();
        stdout().write_all(&u8_values).expect("Failed to write to stdout");
    }

}

pub fn revert_hexdump(reader: Box<dyn io::BufRead>) {
    for buf in reader.lines() {
        match buf {
            Ok(line) => { dump_to_bin(line) }
            Err(_) => { eprintln!("Cannot read input file") }
        }
    }
}