diff --git a/src/main.rs b/src/main.rs
new file mode 100644
index 0000000..a91a19f
--- /dev/null
+++ b/src/main.rs
@@ -0,0 +1,70 @@
+use std::io::{Cursor, Read, Write, Seek, SeekFrom};
+use std::fs::File;
+use std::error::Error;
+use std::env;
+
+use memmap2::MmapOptions;
+use byteorder::{BigEndian, ReadBytesExt};
+
+use osx::{Macho};
+
+fn main() -> Result<(), Box<dyn Error>> {
+    let args = env::args().collect::<Vec<String>>();
+    let ref filename = args.get(1).ok_or("No argument specified")?;
+    let mut file = unsafe {
+        File::open(filename)
+            .and_then(|f| MmapOptions::new().map(&f))
+            .map(|m| Cursor::new(m))
+    }.or(Err(format!("Cannot read file {}", filename)))?;
+
+    let macho = Macho::from(&mut file)?;
+    macho.commands.iter().for_each(|ref cmd| {
+        println!("{}", cmd);
+    });
+
+    let codedata = {
+        let codesignature = macho.codesignature().ok_or("Binary does not have signature")?;
+        let mut codedata = vec![0u8; codesignature.datasize as usize];
+        file.seek(SeekFrom::Start(codesignature.dataoff as u64))?;
+        file.read_exact(&mut codedata)?;
+        codedata
+    };
+
+    let sig = {
+        let mut file = Cursor::new(codedata);
+
+        let magic = file.read_u32::<BigEndian>()?;
+        let length = file.read_u32::<BigEndian>()?;
+        let count = file.read_u32::<BigEndian>()?;
+        let blobs = std::iter::repeat_with(|| {
+            let styp = file.read_u32::<BigEndian>();
+            let soffset = file.read_u32::<BigEndian>();
+            match (styp, soffset) {
+                (Ok(typ), Ok(offset)) => Some((typ, offset)),
+                _ => None
+            }
+        })
+            .take_while(|x| x.is_some())
+            .take(count as usize)
+            .filter_map(|x| x)
+            .collect::<Vec<(u32, u32)>>();
+
+        blobs
+            .iter()
+            .filter(|(typ, _)| *typ == 0x10000)
+            .find_map(|(_, offset)| {
+                file.seek(SeekFrom::Start(*offset as u64)).ok()?;
+                let magic = file.read_u32::<BigEndian>().ok()?;
+                let length = file.read_u32::<BigEndian>().ok()?;
+                let mut buf = vec![0u8; length as usize];
+                file.read_exact(&mut buf).ok()?;
+                Some(buf)
+            })
+            .ok_or("Cannot parse signature")?
+    };
+
+    // let mut sigfile = File::create("signature.p7b")?;
+    // sigfile.write_all(&sig)?;
+
+    Ok(())
+}