CAN总线速度转换器

┌──(kali㉿z3r0)-[/media/sf_shared_kali/ncl doc/scanningrecon]└─$ tshark -r canid589.pcap -t fields -e data.data > data_speed.txt

def format_hex_value(hex_value):    # Tshark exported specific packets to column data.data unformatted.    return ' '.join(hex_value[i:i+2] for i in range(0, len(hex_value), 2))def calculate_speed_from_hex_value(hex_value):    # 5 byte check     if len(hex_value) < 10:        raise ValueError("Hex value must have at least 10 characters for 5 bytes")    # Extract the relevant bytes from payload (the last two bytes)    high_byte = int(hex_value[-4:-2], 16)      low_byte = int(hex_value[-2:], 16)    speed = (high_byte << 8) + low_byte      # Example: 00 00 00 04 e1 - (04 << 8) + e1 = 1024 + 225 = 1249    # Convert speed from centi-KPH to KPH then to MPH    speed_kph = speed / 100.0  # Assuming the value is in centi-KPH    speed_mph = speed_kph * 0.621371  # Convert KPH to MPH    return speed_mphdef main():    speeds = []    with open('data_speed.txt', 'r') as file:        for line in file:            hex_value = line.strip()             if hex_value:                  formatted_hex_value = format_hex_value(hex_value)                print(f"Formatted Hex Value: {formatted_hex_value}")                  try:                    # Calculate speed and store it in the speeds list                    speed_mph = calculate_speed_from_hex_value(hex_value)                    speeds.append(speed_mph)                    print(f"Calculated Speed: {speed_mph:.2f} MPH")                except ValueError as e:                    print(f"Error processing value '{hex_value}': {e}")    speeds.sort()     #Sort lowest to highest    print("Final Sorted Speeds (MPH):")    for speed in speeds:        print(f"{speed:.2f} MPH")if __name__ == "__main__":    main()