init

1 files changed, 37 insertions, 0 deletions

diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..da0e599
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,37 @@
+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(())
+}