4 files changed, 45 insertions, 3 deletions
diff --git a/src/iso/fs.rs b/src/iso/fs.rs
new file mode 100644
index 0000000..1f90851
--- /dev/null
+++ b/src/iso/fs.rs
@@ -0,0 +1,7 @@
+#[repr(C)]
+pub struct FileTableEntry {
+    flags: u8,
+    name_offset: u24, // pointer to string table
+    offset: u32,
+    length: u32,
+}
diff --git a/src/iso/loader.rs b/src/iso/loader.rs
new file mode 100644
index 0000000..b8c61da
--- /dev/null
+++ b/src/iso/loader.rs
@@ -0,0 +1,25 @@
+
+use std::{path::Path};
+use sha2::{Sha256};
+use std::fs::File;
+use hex_literal::hex;
+use digest_io::HashReader;
+use std::io::BufReader;
+
+pub struct GameIso {
+    filepath: bool
+}
+
+impl GameIso {
+    pub fn new<P: AsRef<Path>>(path: P) -> () {
+        let file = File::open(path).unwrap();
+        let reader = BufReader::new(file);
+
+        let mut hasher: HashReader<Sha256, BufReader<File>> = HashReader::<Sha256, BufReader<File>>::new(reader);
+        hasher.hash_to_end();
+        let hash = hasher.finalize();
+        let s: String = hash.iter().map(|b| format!("{:02x}", b)).collect();
+
+        assert!(hash == hex!("a08ad2654831ab298071bdcdf727945efcfdd50d2b0e3512a3d361ee7b18296d"));
+    }
+}
diff --git a/src/iso/mod.rs b/src/iso/mod.rs
new file mode 100644
index 0000000..2d546d9
--- /dev/null
+++ b/src/iso/mod.rs
@@ -0,0 +1,3 @@
+mod loader;
+
+pub use loader::GameIso;
diff --git a/src/main.rs b/src/main.rs
index 44d0887..573b8db 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -1,20 +1,27 @@
+use std::path::PathBuf;
 use clap::Parser;
 
 #[derive(Parser, Debug)]
 #[command(version, about, long_about = None)]
 struct Args {
     #[arg(short, long)]
-    volume: f64,
+    volume: Option<f64>,
     
     #[arg(short, long)]
-    timbre: f64,
+    timbre: Option<f64>,
+    
+    #[arg(long, value_name = "CISO filepath")]
+    iso_path: PathBuf,
 }
 
 mod phonemes;
 mod tokenizer;
+mod iso;
 
 fn main() {
-    let _args = Args::parse();
+    let args = Args::parse();
+
+    let game = iso::GameIso::new(args.iso_path);
 
     println!("Hello, world!");
 }