ft: initial disasm of example data

This only contains two instructions of which I know
the correct output.

src/aout.rs

@@ -0,0 +1,62 @@
+use std::ffi::{c_uchar, c_ushort};
+
+#[allow(non_camel_case_types)]
+pub type c_long = i32; // we use a a.out with 32 byte
+
+#[derive(Debug)]
+#[allow(dead_code)]
+pub struct Aout {
+    pub header: Header,
+    pub text: Vec<u8>,
+    pub data: Vec<u8>,
+}
+
+impl Aout {
+    pub fn new(buf: Vec<u8>) -> Self {
+        let hdr = Header {
+            magic: [buf[0], buf[1]],
+            flags: buf[2],
+            cpu: buf[3],
+            hdrlen: buf[4],
+            unused: buf[5],
+            version: c_ushort::from_be_bytes([buf[6], buf[7]]),
+            text: c_long::from_le_bytes([buf[8], buf[9], buf[10], buf[11]]),
+            data: c_long::from_le_bytes([buf[12], buf[13], buf[14], buf[15]]),
+            bss: c_long::from_le_bytes([buf[16], buf[17], buf[18], buf[19]]),
+            entry: c_long::from_le_bytes([buf[20], buf[21], buf[22], buf[23]]),
+            total: c_long::from_le_bytes([buf[24], buf[25], buf[26], buf[27]]),
+            syms: c_long::from_le_bytes([buf[28], buf[29], buf[30], buf[31]]),
+        };
+
+        let text_start = hdr.hdrlen as usize;
+        let text_end = text_start + hdr.text as usize;
+        let data_start = text_end + 1;
+        let data_end = data_start + hdr.data as usize;
+
+        let text_section = &buf[text_start..text_end];
+        let data_section = &buf[data_start..data_end];
+
+        Aout {
+            header: hdr,
+            text: Vec::from(text_section),
+            data: Vec::from(data_section),
+        }
+    }
+}
+
+#[derive(Debug)]
+#[allow(dead_code)]
+pub struct Header {
+    pub magic: [c_uchar; 2], // magic number
+    pub flags: c_uchar,      // flags, see below
+    pub cpu: c_uchar,        // cpu id
+    pub hdrlen: c_uchar,     // length of header
+    pub unused: c_uchar,     // reserved for future use
+    pub version: c_ushort,   // version stamp
+    pub text: c_long,        // size of text segment in bytes
+    pub data: c_long,        // size of data segment in bytes
+    pub bss: c_long,         // size of bss segment in bytes
+    pub entry: c_long,       // entry point
+    pub total: c_long,       // total memory allocated
+    pub syms: c_long,        // size of symbol table
+}