Add component_data utility

examples/component_data.rs

@@ -0,0 +1,41 @@
+//! Like `load.rs` but a better format for inspecting component custom data.
+
+use std::{collections::HashMap, env::args_os, fs::File, io::BufReader, process::exit};
+
+use blotter::BlotterFile;
+
+fn main() -> Result<(), blotter::error::Error> {
+    let infile = args_os().nth(1).unwrap_or_else(usage);
+    let mut reader = BufReader::new(File::open(infile)?);
+    let blotter_file = BlotterFile::read(&mut reader)?.migrate();
+    let name_map: HashMap<u16, &str> = blotter_file
+        .component_types
+        .iter()
+        .map(|ty| (ty.numeric_id, ty.text_id.as_str()))
+        .collect();
+    for component in &blotter_file.components {
+        let name = name_map
+            .get(&component.type_id)
+            .copied()
+            .unwrap_or("(unknown)");
+        let data = component
+            .custom_data
+            .as_ref()
+            .map(Vec::as_slice)
+            .unwrap_or(&[]);
+
+        println!();
+        println!("{:?}", name);
+        print!("    ({:03})", data.len());
+        for byte in data {
+            print!(" {:02x}", byte);
+        }
+        println!();
+    }
+    Ok(())
+}
+
+fn usage<T>() -> T {
+    eprintln!("missing argument: input file name");
+    exit(1);
+}