From: Jaikanth Krishnaswamy <jaikanth.krishnaswamy@...>
Date: 2010-12-01T06:58:51+09:00
Subject: Re: BitStruct-28bit-Ruby Beginner

Yes I did read the documentation and was trying to see if some 
workaround could be used for odd sized field.
This is part of a protocol simulation that the field is 28 bit long. 
Unfortunately it cannot be broken down to more sensible chunks as you 
suggested.

Tim Roberts wrote in post #963486:
> Jaikanth Krishnaswamy <jaikanth.krishnaswamy@gmail.com> wrote:
>
>>Hi ,
>>I am a beginner to Ruby. I am using the  ruby 1.9.2p0 (2010-08-18
>>revision 29036) [i686-linux] and bit-struct (0.13.6)
>>I am trying to construct a 28 bit length data element in my class
>
> And did you read the documentation that says BitStruct supports fields
> of
> size 1 to 16, or multiples of 8?  28 is not a supported size.
>
>>and am getting the following
>>error./usr/local/ruby/lib/ruby/gems/1.9.1/gems/bit-struct-0.13.6/lib/bit-struct/unsigned-field.rb:244:in
>>`add_accessors_to': unsupported:
>
> That says you're using ruby 1.9.1, not that it matters much.  The error
> is
> telling you that 28 bits is not a valid size.
>
>>I am hoping somebody can direct me to an example of how I can achieve a
>>28 bit field with BitStruct or some other technique..
>
> Perhaps you should describe what you are actually trying to do.  Are you
> trying to parse a file that contains fields of oddly-sized data?  There
> may
> be easier ways.
>
> If nothing else, you can compose your field out of smaller sizes, like
> one
> fields of 24 bits and an adjacent field of 4 bits.  It depends on what
> your
> actual task is.

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