def int_to_varint(val):
    total = val&0x7F
    val >>= 7
    shift = 8
    while val:
        bits = val&0x7F
        val >>= 7
        total = ((0x80|bits)<<shift)|total
        shift += 8
    return total

def varint_to_int(varint):
    total = 0
    shift = varint.bit_length()//8
    for i in range(shift):
        bits = varint&0x7F
        varint >>= 8
        total = (bits<<(7*i))|total
    return total