Re: Need interface advice

From: Daryle Walker (darylew_at_[hidden])
Date: 2001-12-01 14:55:31

on 11/30/01 7:48 PM, David Abrahams at david.abrahams_at_[hidden] wrote:

> I'm showing some interest, but also ignorance: why wouldn't you just do the
> finalization step "on demand", when the checksum is requested? Does that
> invalidate the MD5 process so that it can't be continued?

I came up with a similar idea right when I wrote this message, but I don't
know yet how feasible it is.  Maybe I can cache the result if I get the
checksum multiple times.

> ----- Original Message -----
> From: "Daryle Walker" <darylew_at_[hidden]>
> To: "Boost" <boost_at_[hidden]>
> Sent: Friday, November 30, 2001 7:23 PM
> Subject: [boost] Need interface advice
[SNIP]
>> I want to add a similar class that works the MD5 standard.  But there's an
>> interface problem.  CRC and Adler-32 can process bytes, and the user can
>> check the checksum of what has been processed so far.  Unfortunately, MD5
>> requires a finalization step before getting the checksum.  I could use an
>> interface like CRC, and just add a finalization method to a MD5 class.
>> However, this will add a state so I can make sure that all byte processing
>> occurs before finalization and the checksum calculation happens after
>> finalization.  How should I have the MD5 (class) interface?

-- 
Daryle Walker
Mac, Internet, and Video Game Junkie
darylew AT mac DOT com