from dataclasses import dataclass

def btoi(b, signed=False):
    return int.from_bytes(b, arch.endianness, signed=signed)

def itob(i, signed=False):
    return i.to_bytes(arch.wordsize, arch.endianness, signed=signed)

@dataclass(frozen=True)
class Arch:
    wordsize: int
    endianness: str
    alignment: int
    nopcode: bytes
    def set(self,k):
        self.__dict__.update(k.__dict__)

x86      = Arch( 4, 'little', 16, b'\x90')
x86_64   = Arch( 8, 'little', 16, b'\x90')
ARM      = Arch( 4, 'little',  8, b'\xe1\xa0\x00\x00')
THUMB    = Arch( 4, 'little',  8, b'\x46\xc0')

arch = Arch(**x86_64.__dict__)