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use std::io::BufReader;
use std::{env, fs::File, io::Read};
fn main() -> Result<(), Box<dyn std::error::Error>> {
const CHUNK_SIZE: usize = 8;
let mut file: Box<dyn Read>;
file = if let Some(filename) = env::args().nth(1) {
Box::new(BufReader::new(File::open(&filename)?))
} else {
Box::new(BufReader::new(std::io::stdin()))
};
let mut chunk = Vec::with_capacity(CHUNK_SIZE);
let mut idx = 0;
while {
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;
chunk.clear();
}
Ok(())
}
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