gray.py

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import ctypes
from .encoder_base import EncoderBase

class GrayEncoder(EncoderBase):
    """
    Adapated from example on https://en.wikipedia.org/wiki/Gray_code
    """
    def encode(self, bin_val : ctypes.c_uint):
        return bin_val ^ ( bin_val >> 1)
    
    def decode(self, bin_val : ctypes.c_uint):
        bitmask = bin_val >> 1
        val = bin_val
        while bitmask != 0:
            val = val ^ bitmask
            bitmask = bitmask >> 1
        return val