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https://issues.apache.org/jira/browse/DAFFODIL-1734?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Beckerle reassigned DAFFODIL-1734:
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Assignee: Michael Beckerle
> base64 encoding and other preprocessing
> ---------------------------------------
>
> Key: DAFFODIL-1734
> URL: https://issues.apache.org/jira/browse/DAFFODIL-1734
> Project: Daffodil
> Issue Type: New Feature
> Components: DFDL Language
> Reporter: Michael Beckerle
> Assignee: Michael Beckerle
> Priority: Major
> Fix For: 2.2.0
>
>
> Many formats have payloads that are embedded base64-encoded data.
> We need a DFDL language feature enabling us to specify that the underlying
> bytes of an element are base64 encoded. That is, the data stream is base64
> encoded, and must be decoded and then parsed, or unparsed and then encoded
> into base64 text.
> A similar preprocessing should handle compression, as formats like VMF
> (mil-std-6017) can have compressed payloads.
> In general, we should enable these pre-processing encoder/decoders to be
> pluggable so the set can be extended easily.
> This is a form of layering. If we consider just parsing for a moment, this
> enables one to define an element which is a byte-array or string, and then
> treat that as the input source for subsequent parsing without having to
> explicitly do a second pass of calling daffodil to parse the element. You can
> get Daffodil to do this second pass itself automatically.
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