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pythontype-conversionbit-manipulationbytebit

Python byte array to bit array

I want to parse some data with Python and scapy. Therefor I have to analyse single bits. But at the moment I have for example UDP packets with some payload like:

bytes = b'\x18\x00\x03\x61\xFF\xFF\x00\x05\x42\xFF\xFF\xFF\xFF'

Is there any elegant way to convert the bytes so that I can access single bits like:

bytes_as_bits = convert(bytes)
bit_at_index_42 = bytes_as_bits[42]
Solution

  • That will work:

    def access_bit(data, num):
    base = int(num // 8)
    shift = int(num % 8)
    return (data[base] >> shift) & 0x1

    If you'd like to create a binary array you can use it like this:

    [access_bit(data,i) for i in range(len(data)*8)]