Fun.py

import struct

def get_bool(_bytearray, byte_index, bool_index):
    """
    Get the boolean value from location in bytearray
    """
    index_value = 1 << bool_index
    byte_value = _bytearray[byte_index]
    current_value = byte_value & index_value
    return current_value == index_value

def set_real(_bytearray, byte_index, real):
    """
    Set Real value
    make 4 byte data from real
    """
    real = float(real)
    real = struct.pack('>f', real)
    _bytes = struct.unpack('4B', real)
    for i, b in enumerate(_bytes):
        _bytearray[byte_index + i] = b


def get_real(_bytearray, byte_index):
    """
    Get real value. create float from 4 bytes
    """
    x = _bytearray[byte_index:byte_index + 4]
    real = struct.unpack('>f', struct.pack('4B', *x))[0]
    return real



def get_int(bytearray_, byte_index):
    """
    Get int value from bytearray.

    int are represented in two bytes
    """
    data = bytearray_[byte_index:byte_index + 2]
    data[1] = data[1] & 0xff
    data[0] = data[0] & 0xff
    packed = struct.pack('2B', *data)
    value = struct.unpack('>h', packed)[0]
    return value

def set_int(bytearray_, byte_index, _int):
    """
    Set value in bytearray to int
    """
    # make sure were dealing with an int
    _int = int(_int)
    _bytes = struct.unpack('2B', struct.pack('>h', _int))
    bytearray_[byte_index:byte_index + 2] = _bytes
    return bytearray_