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https://issues.apache.org/jira/browse/DAFFODIL-1742?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16661408#comment-16661408
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Michael Beckerle commented on DAFFODIL-1742:
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This is a major feature requirement for DFDL v2.0 - TIFF is base+offset
oriented. The format can't be parsed end to end. Each record gives an offset
from the end of a header, to the next record, so they can, literally, be
backwards in the file - one must "seek" to parse this.
It is important that any approach to this is (a) declarative (b) invertible -
unparsing should also work - resulting in each record following the previous
one, but these offsets from the base have to get computed automatically much
the way stored lengths do (via outputValueCalc).
> TIFF - need DFDL schema and approach to TIFF
> --------------------------------------------
>
> Key: DAFFODIL-1742
> URL: https://issues.apache.org/jira/browse/DAFFODIL-1742
> Project: Daffodil
> Issue Type: New Feature
> Components: DFDL Language, DFDL Schemas
> Reporter: Michael Beckerle
> Priority: Minor
>
> TIFF image format is not something DFDL v1.0 can describe.
> Nevertheless we need an approach that illustrates how to deal with it.
> I *think* this means a preprocessing program, and then a DFDL schema to turn
> the result of the preprocessor into an Infoset. For unparsing, a
> post-processor also.
> The right approach remains to be seen, but we need to show how to deal with
> TIFF.
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