#!/bin/bash

# Script to get the last two bytes of ium file
# Returns the bytes in 0x format
# Usage: ./get_last_bytes.sh [ium_file_path]

# Use provided path or default to ium.bin
ium_file=${1:-ium.bin}

if [ ! -f "$ium_file" ]; then
    echo "Error: $ium_file file not found"
    exit 1
fi

# Get file size
file_size=$(stat -f%z "$ium_file")

if [ "$file_size" -lt 2 ]; then
    echo "Error: File is too small (less than 2 bytes)"
    exit 1
fi

# Extract last 2 bytes and reverse byte order
last_bytes=$(xxd -s -2 "$ium_file" | cut -d' ' -f2 | tr -d '\n')
# Reverse the byte order (swap first and second byte)
byte1=${last_bytes:0:2}
byte2=${last_bytes:2:2}
echo "${byte2}${byte1}"