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https://issues.apache.org/jira/browse/DAFFODIL-2254?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Steve Lawrence closed DAFFODIL-2254.
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> BLOB support for scanning for end of blob
> -----------------------------------------
>
> Key: DAFFODIL-2254
> URL: https://issues.apache.org/jira/browse/DAFFODIL-2254
> Project: Daffodil
> Issue Type: New Feature
> Components: Back End
> Affects Versions: 2.5.0
> Reporter: Steve Lawrence
> Priority: Minor
>
> To keep the initial BLOB imlementation relatively simple, it only supports
> lengthKind="explicit". However, some formats may need a scanning mechanism to
> find the end of the BLOB. One example of this is RPM, which has a compressed
> payload at the end of the file, and the length is just everything from one
> point to the end of the file. We ideally want to treat this payload as a
> blob, but since there is no explicit length for it, some sort of scanning
> must occurr.
> Some initial thoughts for potential solutions:
> 1. lengthKind="delimited" allows for the end of the data stream to be a
> delimiter. So we could just make changes to delimiter scanning to support
> outputting the field to a blob file rather than somewhere in internal memory.
> This would allow for supporting delimited blobs in cases more than just end
> of stream, but could be some what challenging of a change.
> 2. Support endOfParent for blobs, or perhaps a new lengthKind, or a blob
> specific property that can be used for end of data. The logic here would
> likely be much simpleer than delimier scanning, but is pretty single purpose.
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