"""
Brief:
    This file depicts an issue with large-sized ctypes Structure fields. If the size is larger than
        65535 bytes it defaults to a bits representation via __repr__()/__str__(). 
        
Author:
    Charles Machalow
"""

from ctypes import *
import inspect

class bugStruct(Structure):
    _pack_ = 1
    _fields_ = [
                ("correct", c_uint8 * 65535),
                ("wrongSizeAndOffset", c_uint8 * 999999),
               ]
                

print (''.join(inspect.getsourcelines(bugStruct)[0]))
print("print(str(bugStruct.correct))")
print(str(bugStruct.correct) + " # Correct\n")
print("print(str(bugStruct.wrongSizeAndOffset))")
print(str(bugStruct.wrongSizeAndOffset) + " # Incorrect")
print("# Should be: <Field type=c_ubyte_Array_999999, ofs=65535, size=999999>\n")

print("To get the math for this do the following on an incorrect size/offset:")
print("  size = (bits << 16) + ofs.split(\":\")[1]")
print("  ofs = ofs.split(\":\")[0]")
print("    Though this isn't really safe because the field may actually be bit-sized")