从字节数组中获取位的范围

def get_bits_from_bytearray(bytearray, start_bit, end_bit):
    start_byte = start_bit // 8
    start_offset = start_bit % 8
    end_byte = end_bit // 8
    end_offset = end_bit % 8

    result = 0
    for i in range(start_byte, end_byte + 1):
        if i == start_byte and i == end_byte:
            result |= (bytearray[i] >> start_offset) & ((1 << (end_offset - start_offset + 1)) - 1)
        elif i == start_byte:
            result |= (bytearray[i] >> start_offset)
        elif i == end_byte:
            result |= (bytearray[i] & ((1 << (end_offset + 1)) - 1)) << (8 - start_offset)
        else:
            result |= (bytearray[i] << (8 - start_offset))

    return result