Python3 Byte Utils

byte_utils.py

def until_bytes(input_bytes, ending):
    """ 
    Yields bytes from input up to and including a given ending.
    
    This can be used to seek to the end of a pattern if your
    input_bytes object is an iterator.
    """
    position = 0
    length = len(ending)

    for byte in input_bytes:
        yield byte

        if byte != ending[position]:
            position = 0
            continue
        else:
            position += 1

        if position == length:
            break
    else:
        raise ValueError('{!r} not found'.format(ending))