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comp.lang.ruby

bit-struct and arrays of members?

Markus Fischer

5/24/2009 9:59:00 PM

Hi,

I'm using the bit-struct [1] (which is just awesome, btw) and wondering
how I can realize arrays of members.

I'm reading binary data from pre-existing files which are based on C
structs which look similar to this basic example:

struct {
int vector[5];
...
} vector_t;

My current solution is to just write:

class Vector < BitStruct
default_options :endian => :little
signed vector_1, 32
signed vector_2, 32
signed vector_3, 32
....

I would prefer to use an array. I couldn't figure out how to do it,
there's no example with it and I start to think it's not possible ... ?

thanks,
- Markus

[1] http://redshift.sourceforge.net/b...
4 Answers

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11/23/2008 7:08:00 PM

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** Posted from http://www.te... ** moslem cartoon character
mohammad and his bumchum allaah were child molesting goat fuckers and
nikomaks


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sanha-kzn@sanha.org.za
sanha-gp@sanha.org.za
sanha-cpt@sanha.org.za
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arah1958@gmail.com
islamwayoflife@googlegroups.com
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ipcisa@yebo.co.za

** Posted from http://www.te... **

moslem cartoon character mohammad and his bumchum allaah were child
molesting goat fuckers and nikomaks


_
/'_/)
,/_ /
/ /
/'_'/' '/'__'7,
/'/ / / /" /_ ('( ' /' ')
\ /
'\' _.7'
\ (
\
Up your ass mohammad - Elif air ab tizak!!!

info@muslimmatch.com or apache@muslimmatch.com or
politicsIranian@googlegroups.com
Achmat.Samsodien@gmail.com
fahmi@telkomsa.net
jamiat@islamsa.org.za
dsirc@mweb.co.za
jamiatmp@lantic.co.za
sanha-kzn@sanha.org.za
sanha-gp@sanha.org.za
sanha-cpt@sanha.org.za
helpline@sanha.org.za
arah1958@gmail.com
islamwayoflife@googlegroups.com
furtivo4000@gmail.com
ipcisa@yebo.co.za

** Posted from http://www.te... **


moslem cartoon character mohammad and his bumchum allaah were child
molesting goat fuckers and nikomaks


_
/'_/)
,/_ /
/ /
/'_'/' '/'__'7,
/'/ / / /" /_ ('( ' /' ')
\ /
'\' _.7'
\ (
\
Up your ass mohammad - Elif air ab tizak!!!

info@muslimmatch.com or apache@muslimmatch.com or
politicsIranian@googlegroups.com
Achmat.Samsodien@gmail.com
fahmi@telkomsa.net
jamiat@islamsa.org.za
dsirc@mweb.co.za
jamiatmp@lantic.co.za
sanha-kzn@sanha.org.za
sanha-gp@sanha.org.za
sanha-cpt@sanha.org.za
helpline@sanha.org.za
arah1958@gmail.com
islamwayoflife@googlegroups.com
furtivo4000@gmail.com
ipcisa@yebo.co.za

** Posted from http://www.te... **





moslem cartoon character mohammad and his bumchum allaah were child
molesting goat fuckers and nikomaks


_
/'_/)
,/_ /
/ /
/'_'/' '/'__'7,
/'/ / / /" /_ ('( ' /' ')
\ /
'\' _.7'
\ (
\
Up your ass mohammad - Elif air ab tizak!!!

info@muslimmatch.com or apache@muslimmatch.com or
politicsIranian@googlegroups.com
Achmat.Samsodien@gmail.com
fahmi@telkomsa.net
jamiat@islamsa.org.za
dsirc@mweb.co.za
jamiatmp@lantic.co.za
sanha-kzn@sanha.org.za
sanha-gp@sanha.org.za
sanha-cpt@sanha.org.za
helpline@sanha.org.za
arah1958@gmail.com
islamwayoflife@googlegroups.com
furtivo4000@gmail.com
ipcisa@yebo.co.za

** Posted from http://www.te... **







moslem cartoon character mohammad and his bumchum allaah were child
molesting goat fuckers and nikomaks


_
/'_/)
,/_ /
/ /
/'_'/' '/'__'7,
/'/ / / /" /_ ('( ' /' ')
\ /
'\' _.7'
\ (
\
Up your ass mohammad - Elif air ab tizak!!!

info@muslimmatch.com or apache@muslimmatch.com or
politicsIranian@googlegroups.com
Achmat.Samsodien@gmail.com
fahmi@telkomsa.net
jamiat@islamsa.org.za
dsirc@mweb.co.za
jamiatmp@lantic.co.za
sanha-kzn@sanha.org.za
sanha-gp@sanha.org.za
sanha-cpt@sanha.org.za
helpline@sanha.org.za
arah1958@gmail.com
islamwayoflife@googlegroups.com
furtivo4000@gmail.com
ipcisa@yebo.co.za

** Posted from http://www.te... **









moslem cartoon character mohammad and his bumchum allaah were child
molesting goat fuckers and nikomaks


_
/'_/)
,/_ /
/ /
/'_'/' '/'__'7,
/'/ / / /" /_ ('( ' /' ')
\ /
'\' _.7'
\ (
\
Up your ass mohammad - Elif air ab tizak!!!

info@muslimmatch.com or apache@muslimmatch.com or
politicsIranian@googlegroups.com
Achmat.Samsodien@gmail.com
fahmi@telkomsa.net
jamiat@islamsa.org.za
dsirc@mweb.co.za
jamiatmp@lantic.co.za
sanha-kzn@sanha.org.za
sanha-gp@sanha.org.za
sanha-cpt@sanha.org.za
helpline@sanha.org.za
arah1958@gmail.com
islamwayoflife@googlegroups.com
furtivo4000@gmail.com
ipcisa@yebo.co.za

** Posted from http://www.te... **










moslem cartoon character mohammad and his bumchum allaah were child
molesting goat fuckers and nikomaks


_
/'_/)
,/_ /
/ /
/'_'/' '/'__'7,
/'/ / / /" /_ ('( ' /' ')
\ /
'\' _.7'
\ (
\
Up your ass mohammad - Elif air ab tizak!!!

info@muslimmatch.com or apache@muslimmatch.com or
politicsIranian@googlegroups.com
Achmat.Samsodien@gmail.com
fahmi@telkomsa.net
jamiat@islamsa.org.za
dsirc@mweb.co.za
jamiatmp@lantic.co.za
sanha-kzn@sanha.org.za
sanha-gp@sanha.org.za
sanha-cpt@sanha.org.za
helpline@sanha.org.za
arah1958@gmail.com
islamwayoflife@googlegroups.com
furtivo4000@gmail.com
ipcisa@yebo.co.za

** Posted from http://www.te... **
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arah1958@gmail.com
Achmat.Samsodien@gmail.com
fahmi@telkomsa.net
jamiat@islamsa.org.za
dsirc@mweb.co.za
jamiatmp@lantic.co.za
sanha-kzn@sanha.org.za
sanha-gp@sanha.org.za
sanha-cpt@sanha.org.za
helpline@sanha.org.za
islamwayoflife@googlegroups.com
furtivo4000@gmail.com

** Posted from http://www.te... **

Joel VanderWerf

5/25/2009 7:44:00 PM

0

Markus Fischer wrote:
> Hi,
>
> I'm using the bit-struct [1] (which is just awesome, btw) and wondering
> how I can realize arrays of members.
>
> I'm reading binary data from pre-existing files which are based on C
> structs which look similar to this basic example:
>
> struct {
> int vector[5];
> ...
> } vector_t;
>
> My current solution is to just write:
>
> class Vector < BitStruct
> default_options :endian => :little
> signed vector_1, 32
> signed vector_2, 32
> signed vector_3, 32
> ...
>
> I would prefer to use an array. I couldn't figure out how to do it,
> there's no example with it and I start to think it's not possible ... ?
>
> thanks,
> - Markus
>
> [1] http://redshift.sourceforge.net/b...

Sorry, no support for that (yet). IIRC one of the other libs has
something for this, maybe it was binstruct or binaryparse.

It's not really too different from the #nest construct, so maybe it
could be added along those lines, as long as the array length is static.
Will think about it...

--
vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407

Joel VanderWerf

5/27/2009 12:33:00 AM

0

Markus Fischer wrote:
> I'm using the bit-struct [1] (which is just awesome, btw) and wondering
> how I can realize arrays of members.

Here's a quick implementation and some examples. The main limitation
(that I'm aware of) is that a Vector cannot yet be embedded in another
BitStruct. Will think about that (note hypothetical syntax)...

http://pastebin.co...

--
vjoel : Joel VanderWerf : path berkeley edu : 510 665 3407