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 parse-bytecode

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uctypes_sizeof.py

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import uctypes

desc = {

# arr is array at offset 0, of UINT8 elements, array size is 2

"arr": (uctypes.ARRAY | 0, uctypes.UINT8 | 2),

# arr2 is array at offset 0, size 2, of structures defined recursively

"arr2": (uctypes.ARRAY | 0, 2, {"b": uctypes.UINT8 | 0}),

"arr3": (uctypes.ARRAY | 2, uctypes.UINT16 | 2),

"arr4": (uctypes.ARRAY | 0, 2, {"b": uctypes.UINT8 | 0, "w": uctypes.UINT16 | 1}),

"sub": (0, {

'b1': uctypes.BFUINT8 | 0 | 4 << uctypes.BF_POS | 4 << uctypes.BF_LEN,

'b2': uctypes.BFUINT8 | 0 | 0 << uctypes.BF_POS | 4 << uctypes.BF_LEN,

}),

}

data = bytearray(b"01234567")

S = uctypes.struct(uctypes.addressof(data), desc, uctypes.LITTLE_ENDIAN)

print(uctypes.sizeof(S.arr))

assert uctypes.sizeof(S.arr) == 2

print(uctypes.sizeof(S.arr2))

assert uctypes.sizeof(S.arr2) == 2

print(uctypes.sizeof(S.arr3))

try:

print(uctypes.sizeof(S.arr3[0]))

except TypeError:

print("TypeError")

print(uctypes.sizeof(S.arr4))

assert uctypes.sizeof(S.arr4) == 6

print(uctypes.sizeof(S.sub))

assert uctypes.sizeof(S.sub) == 1