2.6 - 3.x bytearray from c_char_ p

Given a C callback that passes a variable length byte array, how can that
be turned into a bytearray() type?

=====
int use_callback( void (*callback) (unsigned char *, int) )
{
 unsigned char *buffer;

 if(callback == NULL)
  return 1;

 buffer = malloc(3);

 if(buffer == NULL)
  return 1;

 buffer[0] = 1;
 buffer[1] = 2;
 buffer[3] = 3;

 callback(buffer, 3);

 free(buffer);
 return 0;
}
=====

I'm trying to figure out what this would look like.

def Callback(pointer, length):
    Array = bytearray(length)
    Array = some how pull length bytes from pointer with no string
encoding?

CALLBACK_TYPE = CFUNCTYPE(c_char_p, c_int)

UseCallback = use_callback
UseCallback.restype = c_int
UseCallback.argtypes = [ CALLBACK_TYPE ]

callback_wrapper = CALLBACK_TYPE(Callback)
UseCallback(callback_wrapper)


I've seen examples of passing an already created bytearray as a ctypes
function argument, but not this. Maybe there is a way to do it with
strings, but the raw bytes of python strings in general is about ambiguous
as it gets in my mind. 


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