If it is something quite simple you can use the lazy variants and provided that you don't try to hold onto the input you should get nice constant space without trying too hard.

I recommend the early chapters on IO in real world haskell if you want more info on lazy IO.

On 24 Sep 2011 03:06, "anyzhen" <jiangzhen3s@qq.com> wrote:
> consider this :
> i want load a 4G file(or some bigger file) ,and the process data operation just like 010 to 101( XOR bits ) , is it some efficient function down it ?
> such hPutStr hPutChar is Char layer , is exist bit layer operations?
>
>
> thanks for any help
>
>
> jiangzhen3s@qq.com