[Glass] How to properly write bytes objects into binary streams?

Dale Henrichs via Glass glass at lists.gemtalksystems.com
Tue Sep 2 08:30:45 PDT 2014


Mariano,

Is this still an issue? I see from later messages that you discovered
#isByteOrSpecialand I assume that it's related...

Dale


On Tue, Sep 2, 2014 at 7:09 AM, Mariano Martinez Peck via Glass <
glass at lists.gemtalksystems.com> wrote:

> Hi guys,
>
> In Pharo (yes, sorry if many of my threads start this way), we are able to
> directly write a byte object, that is,  variableByteSubclass:... ,  into a
> binary stream. Example:
>
> | buffer position byteObject |
> buffer := ByteArray new: 100.
> position := 5.
> byteObject := 8932479837423648732648237642.
> buffer replaceFrom: position + 1 to: position + byteObject size with:
> byteObject.
>
> Now buffer is:
>
>  #[0 0 0 0 0 74 234 94 86 234 171 88 69 46 198 220 28 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
> 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0]
>
> In the same way I wrote there a large positive integer, I can also write
> any other byte-like object. This is efficient since I avoid a kind of
> #asByteArray and mostly, because I have a unified way to write a byte
> object to a binary stream, and then read it back.
>
> In GemStone this doesn't work. I thought I could do a #asByteArray and
> then a #nextPutAll:   That works, for example, for LargeInteger, but not
> for Float or Character.
>
> So....I wonder...is there a unified way to get a sequence of bytes from
> byte-like objects and then to instantiate them with such sequence of bytes?
>
> Thanks in advance,
>
>
>
>
> --
> Mariano
> http://marianopeck.wordpress.com
>
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>
>
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