[plt-scheme] Re: Using PLT Scheme libs elsewhere?

Thanks. I'd use UNLESS instead of (if (not blah) one-armed-if).

On May 18, 2007, at 4:18 AM, Jens Axel Søgaard wrote:

> Hi,
>
> SpinyNorman wrote:
>
>> Share?  I'm flattered.  Here it is, and my only claim at this  
>> point is
>> that hey, it works.  Algorithmic insights are more than welcome.
>>
>> (require (lib "md5.ss"))
>>
> This md5.ss implements MD5 in Scheme. The Java MD5 is probably  
> implemented in C.
> So if you switch to a C-based MD5 implementation, you'll get a  
> speedup. Here is
> what to do:
>
> (require (planet "digest.ss" ("soegaard" "digest.plt" 1 2)))
> (require mzscheme)
>
> (define test-string (make-string 10000))
>
> (define (md-file-chunks port chunk-size)
>  (let loop ()
>    (begin
>      (display (md5 (read-bytes chunk-size port)))
>      (newline))
>    (if (not (eof-object? (peek-byte port)))
>    (loop))))
>
> (md-file-chunks (open-input-string test-string) 1024)
>
> See
> <http://planet.plt-scheme.org/display.ss? 
> package=digest.plt&owner=soegaard>
> for documentation.
>
> This was tested on Windows, but ought to work elsewhere too.
> You'll need a relatively new version of PLT Scheme, for
> example 369.100.
>
> It wasn't obvious whether you put the md-file-chunks in a module or
> whether you are using the top-level. If you are using the top-level,
> the line
>
>    (require mzscheme)
>
> makes sure primitive operations are inlined.
>
> I'd love to hear your new timings.
>
> PS: Remember to close file ports after use.
>
> -- 
> Jens Axel Søgaard
>
>
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