initial

src/common.rs

@@ -0,0 +1,10 @@
+use std::fs::{File};
+use std::io::{Read, Seek, SeekFrom};
+
+pub fn read_file(mut file: &File, offset: u64, size: usize) -> Result<Vec<u8>, Box<dyn std::error::Error>> {
+    file.seek(SeekFrom::Start(offset))?;
+    let mut buffer = vec![0u8; size];
+    let _bytes_read = file.read(&mut buffer)?;
+
+    Ok(buffer)
+}