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|
use anyhow::{bail, Result};
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);
}
fn main() -> Result<()> {
let args = Args::parse();
let mut input = File::open(args.file)?;
let mut buf = vec![0u8; 0x10];
if let Err(e) = input.read_exact(&mut buf) {
match e.kind() {
ErrorKind::UnexpectedEof => bail!("malformed ROM file."),
_ => return Err(e.into()),
}
}
let header = match Header::try_from(buf.as_slice()) {
Ok(h) => h,
Err(e) => bail!("{}.", e),
};
print_header(&header);
Ok(())
}
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