reader.py

def read(filename):
    with open(filename, "rb") as f:

        # Reading and Saving
        magic = f.read(4)

        if magic != b"PHOE":
            raise Exception("File type not supported/Wrong file type")


        version = int.from_bytes(f.read(1), "little")

        if version != 1:
            raise Exception("Unsupported Version!")


        msg_len = int.from_bytes(f.read(4), "little") # message length
        
        msg = f.read(msg_len)


        if len(msg) != msg_len:
            raise Exception("File is corrupted")


        return {
            "magic": magic.decode(),
            "version": version,
            "msg_len": msg_len,
            "msg": msg.decode()
        }