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https://issues.apache.org/jira/browse/DAFFODIL-2473?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17335441#comment-17335441
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Mike Beckerle commented on DAFFODIL-2473:
-----------------------------------------
Welcome. I added you as a "contributor" to the project. See if you can assign
the ticket to yourself, and please sign up for the dev mailing list and ask
questions there.
You've picked a good ticket to start with. There's code there where you can
copy the pattern of how other functions work, how they're tested etc. These
new functions are closest conceptually to perhaps the floating point
floor/ceiling/round type functions. You can dig into those.
> Need bit-wise AND, OR, NOT, and shift operations
> ------------------------------------------------
>
> Key: DAFFODIL-2473
> URL: https://issues.apache.org/jira/browse/DAFFODIL-2473
> Project: Daffodil
> Issue Type: New Feature
> Components: Back End, Front End
> Affects Versions: 3.0.0
> Reporter: Mike Beckerle
> Priority: Critical
>
> There are a number of data representations DFDL cannot handle because it
> cannot manipulate numbers with sufficient flexibility in expressions.
> We need AND, OR, NOT, maybe XOR, and shift left, shift right, and probably
> arithmetic shift right (which does sign-extension of signed numbers). We
> should add functions for the whole set of them.
> On signed numbers with specific sizes (long, int, short, byte) these should
> behave as if the data was binary in 2s complement representation, i.e., as if
> the most-significant-bit was playing the role of 2s complement sign.
> These operations should all be undefined (Schema Def Error) on decimal,
> integer, and non-negative integer values, as well as float and double.
> Specifically, these operations are defined on long and its subtypes, and
> unsignedLong and its subtypes only.
>
>
>
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