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use clap::Parser as ClapParser;
use header::{Header, Kind};
use std::fs::File;
use std::io::{ErrorKind, Read};
/// Display information about NES/Famicom ROM files.
#[derive(ClapParser, Debug)]
#[command(version, about, long_about = None)]
struct Args {
/// NES/Famicom ROM file from which to display information.
file: String,
}
fn print_header(header: &Header) {
println!("Header:");
match header.kind {
Kind::INes => println!(" Kind:\t\tiNES"),
Kind::Nes20 => println!(" Kind:\t\tNES 2.0"),
}
println!(
" PRG ROM size:\t{} bytes ({}KB)",
header.prg_rom_size * 16 * 1024,
header.prg_rom_size * 16
);
println!(
" CHR ROM size:\t{} bytes ({}KB)",
header.chr_rom_size * 8 * 1024,
header.chr_rom_size * 8
);
println!(" Mapper:\t{}", header.mapper);
}
// Print the given `message` and exit(1).
fn die(message: String) {
println!("{}", message);
std::process::exit(1);
}
fn main() {
let args = Args::parse();
let Ok(mut input) = File::open(&args.file) else {
die(format!("failed to open the given file '{}'", &args.file));
return;
};
let mut buf = vec![0u8; 0x10];
if let Err(e) = input.read_exact(&mut buf) {
match e.kind() {
ErrorKind::UnexpectedEof => die("malformed ROM file".to_string()),
_ => die(e.to_string()),
}
}
let header = match Header::try_from(buf.as_slice()) {
Ok(h) => h,
Err(e) => {
die(e.to_string());
return;
}
};
print_header(&header);
}
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