[Newbies] Compressing large arrays

[Thiede, Christoph]

Mh, actually I was not talking about Forms but about sound samples ...

________________________________
Von: Beginners <beginners-bounces at lists.squeakfoundation.org> im Auftrag von Yoshiki Ohshima <Yoshiki.Ohshima at acm.org>
Gesendet: Dienstag, 1. Oktober 2019 16:04:06
An: A friendly place to get answers to even the most basic questions about Squeak.
Betreff: Re: [Newbies] Compressing large arrays

The thing to use is the hackBits: method of Form class.  It is a bit
tricky to use, but some examples can be found here:

http://forum.world.st/Get-raw-24-Bit-image-data-into-a-Form-td4846845.html

basically the BitBlt mechanism can take byte objects as well as word
objects and "render" one kind onto another.

On Tue, Oct 1, 2019 at 3:14 AM Thiede, Christoph
<Christoph.Thiede at student.hpi.uni-potsdam.de> wrote:
>
> Thank you for your reply. I already thought about bit manipulation, but actually, I was searching for an existing interface for this purpose. So there is no one (yet)?
>
> ________________________________
> Von: Beginners <beginners-bounces at lists.squeakfoundation.org> im Auftrag von Yoshiki Ohshima <Yoshiki.Ohshima at acm.org>
> Gesendet: Montag, 30. September 2019 20:30:37
> An: A friendly place to get answers to even the most basic questions about Squeak.
> Betreff: Re: [Newbies] Compressing large arrays
>
> For values in that range, you can store them in a typed array called
> ShortIntegerArray. (not 6 or 8 bytes but 2 bytes per value). Then,
> there are some bit manipulation magic to get bytes and simply store
> them into a file for example.
>
> On Mon, Sep 30, 2019 at 9:31 AM Thiede, Christoph
> <Christoph.Thiede at student.hpi.uni-potsdam.de> wrote:
> >
> > Hi,
> >
> >
> > today I learned that I can use #byte64Encoded to compress ByteArrays (and #mimeDecodeToBytes: to uncompress it again).
> >
> > However, I wonder whether there is an option to do the same for arrays that elements' are not limited to bytes. Concretely, I have got an array of integers in range (-20601 to: 20935), so I can map it to 6 or 8 bytes per value. Does Squeak support any way to compress such an array to a stream?
> >
> >
> > Best,
> >
> > Christoph
> >
> > _______________________________________________
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> > Beginners at lists.squeakfoundation.org
> > http://lists.squeakfoundation.org/mailman/listinfo/beginners
>
>
>
> --
> -- Yoshiki
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