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use std::{env, fs::File, io::Read};
fn main() -> Result<(), Box<dyn std::error::Error>> {
const CHUNK_SIZE: usize = 8;
let filename = env::args().nth(1).unwrap_or_default();
if filename.is_empty() {
eprintln!("error missing filename");
return Ok(());
}
let mut file = File::open(&filename)?;
let mut chunk = Vec::with_capacity(CHUNK_SIZE);
let mut idx = 0;
while {
chunk.clear();
file.by_ref()
.take(CHUNK_SIZE as u64)
.read_to_end(&mut chunk)?
> 0
} {
// write index
print!("{:010}: ", idx);
// write hex
for byte in &chunk {
print!("{:02X} ", byte);
}
// write ascii
println!("{}", String::from_utf8_lossy(&chunk).replace('\n', "⏎"));
idx += CHUNK_SIZE;
}
Ok(())
}
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