/******************************************************************************
 * This program implements the XOR stream cipher.
 * 
 * Copyright © 2021 Richard Lesh.  All rights reserved.
 *****************************************************************************/

#![allow(dead_code)]
#![allow(non_snake_case)]
#![allow(non_upper_case_globals)]
#[macro_use]
mod utils;
use std::env;
use std::io::Read;
use std::process;

fn process_file(from_filespec:&str, to_filespec:&str, password:&str) -> Result<(), utils::CustomError> {

    let mut c:u8;
    let plen:isize = strlen(password);
    let mut count:isize = 0;
    while (c = utils::getbyte(&mut ifh)) != -1 {
        let mut x:isize = c ^ password[count % plen];
        ofh.write(&[x])?;
        count += 1;
    }
    return Ok(());
}

fn main() {
    let args: Vec<String> = env::args().collect();
    if args.len() != 4 {
        println!("Syntax: XORCipher {{fromFilespec}} {{toFilespec}} {{password}}");
        process::exit(1);
    }
    let mut from_filespec:String = args[1];
    let mut to_filespec:String = args[2];
    let mut password:String = args[3];

    match (|| -> Result<(), utils::CustomError>{
        process_file(&from_filespec, &to_filespec, &password)?;
        return Ok(());
    })() {
        Ok(()) => {},
        Err(ex) => {
            match ex {
                utils::CustomError::IOError(ex) => {
                    println!("Error: {}", format!("{}", ex));
                }
            }
        }
    };
}