Memory Manipulation Utilities

mem_utils.py

import ctypes


def size_of(obj):	
    cls = type(obj)	
    return cls.__sizeof__(obj)


def mem_replace(target, source):
    target_size = size_of(target)
    source_size = size_of(source)

    ctypes.memmove(
        id(target),
        id(source),
        max(target_size, source_size)
    )


def mem_switch(obj1, obj2):
    dummy = object()

    mem_replace(dummy, obj1)
    mem_replace(obj1, obj2)
    mem_replace(obj2, dummy)


def mem_read_bytes(addr, amount):
    char_array = (ctypes.c_char * amount)
    mem_bytes = char_array.from_address(addr)
    return bytes(mem_bytes)


def mem_read_object(target):
    data = mem_read_bytes(
        id(target),
        size_of(target)
    )

    return data


def mem_equal(obj1, obj2):
    if obj1 is obj2:
        return True

    obj1_bytes = mem_read_object(obj1)
    obj2_bytes = mem_read_object(obj2)

    return obj1_bytes == obj2_bytes