[Toybox] md5sum cleanup

[Ivo van Poorten]

On Sat, 7 Jun 2014 15:36:27 +0200 Ivo van Poorten <ivopvp at gmail.com>
wrote:
> On Sun, 01 Jun 2014 12:00:08 -0500 Rob Landley <rob at landley.net>
> wrote:
> > On 05/15/14 11:50, Ivo van Poorten wrote:
> > > cur-hg      8.6
> > > daniel      6.7
> > > ivo         4.9
> > > md5sum      2.8
> > > openssl     2.7
> 
> The attached patch averages out to 3.2s on the same dataset and cpu.
> [bloatcheck] total                         1448
> 
> [...]
> Perhaps the memcpy() is becoming a bottleneck.

Here's the same, but with memcpy largely removed (only used for partial
frames). Speed averages to 3.0s and it adds less bloat, probably
because it can keep the buffer pointer in a register between calls.

BTW sha1sum could use a similar treatment. Currently it is 4x slower
than gnu's sha1sum :)

Regards,
Ivo
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